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
152 URLContext *http_url_context = ffio_geturlcontext(*pb);
153 av_assert0(http_url_context);
155 ffurl_shutdown(http_url_context, AVIO_FLAG_WRITE);
160 static void set_codec_str(AVFormatContext *s, AVCodecParameters *par,
163 const AVCodecTag *tags[2] = { NULL, NULL };
167 // common Webm codecs are not part of RFC 6381
168 for (i = 0; codecs[i].id; i++)
169 if (codecs[i].id == par->codec_id) {
170 av_strlcpy(str, codecs[i].str, size);
174 // for codecs part of RFC 6381
175 if (par->codec_type == AVMEDIA_TYPE_VIDEO)
176 tags[0] = ff_codec_movvideo_tags;
177 else if (par->codec_type == AVMEDIA_TYPE_AUDIO)
178 tags[0] = ff_codec_movaudio_tags;
182 tag = av_codec_get_tag(tags, par->codec_id);
190 if (!strcmp(str, "mp4a") || !strcmp(str, "mp4v")) {
192 tags[0] = ff_mp4_obj_type;
193 oti = av_codec_get_tag(tags, par->codec_id);
195 av_strlcatf(str, size, ".%02"PRIx32, oti);
199 if (tag == MKTAG('m', 'p', '4', 'a')) {
200 if (par->extradata_size >= 2) {
201 int aot = par->extradata[0] >> 3;
203 aot = ((AV_RB16(par->extradata) >> 5) & 0x3f) + 32;
204 av_strlcatf(str, size, ".%d", aot);
206 } else if (tag == MKTAG('m', 'p', '4', 'v')) {
207 // Unimplemented, should output ProfileLevelIndication as a decimal number
208 av_log(s, AV_LOG_WARNING, "Incomplete RFC 6381 codec string for mp4v\n");
210 } else if (!strcmp(str, "avc1")) {
211 uint8_t *tmpbuf = NULL;
212 uint8_t *extradata = par->extradata;
213 int extradata_size = par->extradata_size;
216 if (extradata[0] != 1) {
218 if (avio_open_dyn_buf(&pb) < 0)
220 if (ff_isom_write_avcc(pb, extradata, extradata_size) < 0) {
221 ffio_free_dyn_buf(&pb);
224 extradata_size = avio_close_dyn_buf(pb, &extradata);
228 if (extradata_size >= 4)
229 av_strlcatf(str, size, ".%02x%02x%02x",
230 extradata[1], extradata[2], extradata[3]);
235 static int flush_dynbuf(OutputStream *os, int *range_length)
240 return AVERROR(EINVAL);
244 av_write_frame(os->ctx, NULL);
245 avio_flush(os->ctx->pb);
248 *range_length = avio_close_dyn_buf(os->ctx->pb, &buffer);
250 avio_write(os->out, buffer, *range_length);
254 return avio_open_dyn_buf(&os->ctx->pb);
257 static void set_http_options(AVDictionary **options, DASHContext *c)
260 av_dict_set(options, "user_agent", c->user_agent, 0);
261 if (c->http_persistent)
262 av_dict_set_int(options, "multiple_requests", 1, 0);
265 static void get_hls_playlist_name(char *playlist_name, int string_size,
266 const char *base_url, int id) {
268 snprintf(playlist_name, string_size, "%smedia_%d.m3u8", base_url, id);
270 snprintf(playlist_name, string_size, "media_%d.m3u8", id);
273 static int flush_init_segment(AVFormatContext *s, OutputStream *os)
275 DASHContext *c = s->priv_data;
276 int ret, range_length;
278 ret = flush_dynbuf(os, &range_length);
282 os->pos = os->init_range_length = range_length;
284 ff_format_io_close(s, &os->out);
288 static void dash_free(AVFormatContext *s)
290 DASHContext *c = s->priv_data;
294 for (i = 0; i < c->nb_as; i++)
295 av_dict_free(&c->as[i].metadata);
302 for (i = 0; i < s->nb_streams; i++) {
303 OutputStream *os = &c->streams[i];
304 if (os->ctx && os->ctx_inited)
305 av_write_trailer(os->ctx);
306 if (os->ctx && os->ctx->pb)
307 ffio_free_dyn_buf(&os->ctx->pb);
308 ff_format_io_close(s, &os->out);
310 avformat_free_context(os->ctx);
311 for (j = 0; j < os->nb_segments; j++)
312 av_free(os->segments[j]);
313 av_free(os->segments);
315 av_freep(&c->streams);
317 ff_format_io_close(s, &c->mpd_out);
318 ff_format_io_close(s, &c->m3u8_out);
321 static void output_segment_list(OutputStream *os, AVIOContext *out, AVFormatContext *s,
322 int representation_id, int final)
324 DASHContext *c = s->priv_data;
325 int i, start_index = 0, start_number = 1;
326 if (c->window_size) {
327 start_index = FFMAX(os->nb_segments - c->window_size, 0);
328 start_number = FFMAX(os->segment_index - c->window_size, 1);
331 if (c->use_template) {
332 int timescale = c->use_timeline ? os->ctx->streams[0]->time_base.den : AV_TIME_BASE;
333 avio_printf(out, "\t\t\t\t<SegmentTemplate timescale=\"%d\" ", timescale);
334 if (!c->use_timeline)
335 avio_printf(out, "duration=\"%"PRId64"\" ", c->last_duration);
336 avio_printf(out, "initialization=\"%s\" media=\"%s\" startNumber=\"%d\">\n", c->init_seg_name, c->media_seg_name, c->use_timeline ? start_number : 1);
337 if (c->use_timeline) {
338 int64_t cur_time = 0;
339 avio_printf(out, "\t\t\t\t\t<SegmentTimeline>\n");
340 for (i = start_index; i < os->nb_segments; ) {
341 Segment *seg = os->segments[i];
343 avio_printf(out, "\t\t\t\t\t\t<S ");
344 if (i == start_index || seg->time != cur_time) {
345 cur_time = seg->time;
346 avio_printf(out, "t=\"%"PRId64"\" ", seg->time);
348 avio_printf(out, "d=\"%d\" ", seg->duration);
349 while (i + repeat + 1 < os->nb_segments &&
350 os->segments[i + repeat + 1]->duration == seg->duration &&
351 os->segments[i + repeat + 1]->time == os->segments[i + repeat]->time + os->segments[i + repeat]->duration)
354 avio_printf(out, "r=\"%d\" ", repeat);
355 avio_printf(out, "/>\n");
357 cur_time += (1 + repeat) * seg->duration;
359 avio_printf(out, "\t\t\t\t\t</SegmentTimeline>\n");
361 avio_printf(out, "\t\t\t\t</SegmentTemplate>\n");
362 } else if (c->single_file) {
363 avio_printf(out, "\t\t\t\t<BaseURL>%s</BaseURL>\n", os->initfile);
364 avio_printf(out, "\t\t\t\t<SegmentList timescale=\"%d\" duration=\"%"PRId64"\" startNumber=\"%d\">\n", AV_TIME_BASE, c->last_duration, start_number);
365 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);
366 for (i = start_index; i < os->nb_segments; i++) {
367 Segment *seg = os->segments[i];
368 avio_printf(out, "\t\t\t\t\t<SegmentURL mediaRange=\"%"PRId64"-%"PRId64"\" ", seg->start_pos, seg->start_pos + seg->range_length - 1);
369 if (seg->index_length)
370 avio_printf(out, "indexRange=\"%"PRId64"-%"PRId64"\" ", seg->start_pos, seg->start_pos + seg->index_length - 1);
371 avio_printf(out, "/>\n");
373 avio_printf(out, "\t\t\t\t</SegmentList>\n");
375 avio_printf(out, "\t\t\t\t<SegmentList timescale=\"%d\" duration=\"%"PRId64"\" startNumber=\"%d\">\n", AV_TIME_BASE, c->last_duration, start_number);
376 avio_printf(out, "\t\t\t\t\t<Initialization sourceURL=\"%s\" />\n", os->initfile);
377 for (i = start_index; i < os->nb_segments; i++) {
378 Segment *seg = os->segments[i];
379 avio_printf(out, "\t\t\t\t\t<SegmentURL media=\"%s\" />\n", seg->file);
381 avio_printf(out, "\t\t\t\t</SegmentList>\n");
383 if (c->hls_playlist && start_index < os->nb_segments)
385 int timescale = os->ctx->streams[0]->time_base.den;
386 char temp_filename_hls[1024];
387 char filename_hls[1024];
388 AVDictionary *http_opts = NULL;
389 int target_duration = 0;
391 const char *proto = avio_find_protocol_name(c->dirname);
392 int use_rename = proto && !strcmp(proto, "file");
394 get_hls_playlist_name(filename_hls, sizeof(filename_hls),
395 c->dirname, representation_id);
397 snprintf(temp_filename_hls, sizeof(temp_filename_hls), use_rename ? "%s.tmp" : "%s", filename_hls);
399 set_http_options(&http_opts, c);
400 dashenc_io_open(s, &c->m3u8_out, temp_filename_hls, &http_opts);
401 av_dict_free(&http_opts);
402 for (i = start_index; i < os->nb_segments; i++) {
403 Segment *seg = os->segments[i];
404 double duration = (double) seg->duration / timescale;
405 if (target_duration <= duration)
406 target_duration = lrint(duration);
409 ff_hls_write_playlist_header(c->m3u8_out, 6, -1, target_duration,
410 start_number, PLAYLIST_TYPE_NONE);
412 ff_hls_write_init_file(c->m3u8_out, os->initfile, c->single_file,
413 os->init_range_length, os->init_start_pos);
415 for (i = start_index; i < os->nb_segments; i++) {
416 Segment *seg = os->segments[i];
417 ret = ff_hls_write_file_entry(c->m3u8_out, 0, c->single_file,
418 (double) seg->duration / timescale, 0,
419 seg->range_length, seg->start_pos, NULL,
420 c->single_file ? os->initfile : seg->file,
423 av_log(os->ctx, AV_LOG_WARNING, "ff_hls_write_file_entry get error\n");
428 ff_hls_write_end_list(c->m3u8_out);
430 dashenc_io_close(s, &c->m3u8_out, temp_filename_hls);
433 if (avpriv_io_move(temp_filename_hls, filename_hls) < 0) {
434 av_log(os->ctx, AV_LOG_WARNING, "renaming file %s to %s failed\n\n", temp_filename_hls, filename_hls);
440 static char *xmlescape(const char *str) {
441 int outlen = strlen(str)*3/2 + 6;
442 char *out = av_realloc(NULL, outlen + 1);
446 for (; *str; str++) {
447 if (pos + 6 > outlen) {
449 outlen = 2 * outlen + 6;
450 tmp = av_realloc(out, outlen + 1);
458 memcpy(&out[pos], "&", 5);
460 } else if (*str == '<') {
461 memcpy(&out[pos], "<", 4);
463 } else if (*str == '>') {
464 memcpy(&out[pos], ">", 4);
466 } else if (*str == '\'') {
467 memcpy(&out[pos], "'", 6);
469 } else if (*str == '\"') {
470 memcpy(&out[pos], """, 6);
480 static void write_time(AVIOContext *out, int64_t time)
482 int seconds = time / AV_TIME_BASE;
483 int fractions = time % AV_TIME_BASE;
484 int minutes = seconds / 60;
485 int hours = minutes / 60;
488 avio_printf(out, "PT");
490 avio_printf(out, "%dH", hours);
491 if (hours || minutes)
492 avio_printf(out, "%dM", minutes);
493 avio_printf(out, "%d.%dS", seconds, fractions / (AV_TIME_BASE / 10));
496 static void format_date_now(char *buf, int size)
498 time_t t = time(NULL);
499 struct tm *ptm, tmbuf;
500 ptm = gmtime_r(&t, &tmbuf);
502 if (!strftime(buf, size, "%Y-%m-%dT%H:%M:%SZ", ptm))
507 static int write_adaptation_set(AVFormatContext *s, AVIOContext *out, int as_index,
510 DASHContext *c = s->priv_data;
511 AdaptationSet *as = &c->as[as_index];
512 AVDictionaryEntry *lang, *role;
515 avio_printf(out, "\t\t<AdaptationSet id=\"%s\" contentType=\"%s\" segmentAlignment=\"true\" bitstreamSwitching=\"true\"",
516 as->id, as->media_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
517 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)
518 avio_printf(out, " maxFrameRate=\"%d/%d\"", as->max_frame_rate.num, as->max_frame_rate.den);
519 lang = av_dict_get(as->metadata, "language", NULL, 0);
521 avio_printf(out, " lang=\"%s\"", lang->value);
522 avio_printf(out, ">\n");
524 role = av_dict_get(as->metadata, "role", NULL, 0);
526 avio_printf(out, "\t\t\t<Role schemeIdUri=\"urn:mpeg:dash:role:2011\" value=\"%s\"/>\n", role->value);
528 for (i = 0; i < s->nb_streams; i++) {
529 OutputStream *os = &c->streams[i];
531 if (os->as_idx - 1 != as_index)
534 if (as->media_type == AVMEDIA_TYPE_VIDEO) {
535 AVStream *st = s->streams[i];
536 avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"video/%s\" codecs=\"%s\"%s width=\"%d\" height=\"%d\"",
537 i, os->format_name, os->codec_str, os->bandwidth_str, s->streams[i]->codecpar->width, s->streams[i]->codecpar->height);
538 if (st->avg_frame_rate.num)
539 avio_printf(out, " frameRate=\"%d/%d\"", st->avg_frame_rate.num, st->avg_frame_rate.den);
540 avio_printf(out, ">\n");
542 avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"audio/%s\" codecs=\"%s\"%s audioSamplingRate=\"%d\">\n",
543 i, os->format_name, os->codec_str, os->bandwidth_str, s->streams[i]->codecpar->sample_rate);
544 avio_printf(out, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n",
545 s->streams[i]->codecpar->channels);
547 output_segment_list(os, out, s, i, final);
548 avio_printf(out, "\t\t\t</Representation>\n");
550 avio_printf(out, "\t\t</AdaptationSet>\n");
555 static int add_adaptation_set(AVFormatContext *s, AdaptationSet **as, enum AVMediaType type)
557 DASHContext *c = s->priv_data;
559 void *mem = av_realloc(c->as, sizeof(*c->as) * (c->nb_as + 1));
561 return AVERROR(ENOMEM);
565 *as = &c->as[c->nb_as - 1];
566 memset(*as, 0, sizeof(**as));
567 (*as)->media_type = type;
572 static int adaptation_set_add_stream(AVFormatContext *s, int as_idx, int i)
574 DASHContext *c = s->priv_data;
575 AdaptationSet *as = &c->as[as_idx - 1];
576 OutputStream *os = &c->streams[i];
578 if (as->media_type != s->streams[i]->codecpar->codec_type) {
579 av_log(s, AV_LOG_ERROR, "Codec type of stream %d doesn't match AdaptationSet's media type\n", i);
580 return AVERROR(EINVAL);
581 } else if (os->as_idx) {
582 av_log(s, AV_LOG_ERROR, "Stream %d is already assigned to an AdaptationSet\n", i);
583 return AVERROR(EINVAL);
590 static int parse_adaptation_sets(AVFormatContext *s)
592 DASHContext *c = s->priv_data;
593 const char *p = c->adaptation_sets;
594 enum { new_set, parse_id, parsing_streams } state;
598 // default: one AdaptationSet for each stream
600 for (i = 0; i < s->nb_streams; i++) {
601 if ((ret = add_adaptation_set(s, &as, s->streams[i]->codecpar->codec_type)) < 0)
603 snprintf(as->id, sizeof(as->id), "%d", i);
605 c->streams[i].as_idx = c->nb_as;
610 // syntax id=0,streams=0,1,2 id=1,streams=3,4 and so on
616 } else if (state == new_set && av_strstart(p, "id=", &p)) {
618 if ((ret = add_adaptation_set(s, &as, AVMEDIA_TYPE_UNKNOWN)) < 0)
622 snprintf(as->id, sizeof(as->id), "%.*s", n, p);
628 } else if (state == parse_id && av_strstart(p, "streams=", &p)) {
629 state = parsing_streams;
630 } else if (state == parsing_streams) {
631 AdaptationSet *as = &c->as[c->nb_as - 1];
632 char idx_str[8], *end_str;
634 n = strcspn(p, " ,");
635 snprintf(idx_str, sizeof(idx_str), "%.*s", n, p);
638 // if value is "a" or "v", map all streams of that type
639 if (as->media_type == AVMEDIA_TYPE_UNKNOWN && (idx_str[0] == 'v' || idx_str[0] == 'a')) {
640 enum AVMediaType type = (idx_str[0] == 'v') ? AVMEDIA_TYPE_VIDEO : AVMEDIA_TYPE_AUDIO;
641 av_log(s, AV_LOG_DEBUG, "Map all streams of type %s\n", idx_str);
643 for (i = 0; i < s->nb_streams; i++) {
644 if (s->streams[i]->codecpar->codec_type != type)
647 as->media_type = s->streams[i]->codecpar->codec_type;
649 if ((ret = adaptation_set_add_stream(s, c->nb_as, i)) < 0)
652 } else { // select single stream
653 i = strtol(idx_str, &end_str, 10);
654 if (idx_str == end_str || i < 0 || i >= s->nb_streams) {
655 av_log(s, AV_LOG_ERROR, "Selected stream \"%s\" not found!\n", idx_str);
656 return AVERROR(EINVAL);
658 av_log(s, AV_LOG_DEBUG, "Map stream %d\n", i);
660 if (as->media_type == AVMEDIA_TYPE_UNKNOWN) {
661 as->media_type = s->streams[i]->codecpar->codec_type;
664 if ((ret = adaptation_set_add_stream(s, c->nb_as, i)) < 0)
673 return AVERROR(EINVAL);
678 // check for unassigned streams
679 for (i = 0; i < s->nb_streams; i++) {
680 OutputStream *os = &c->streams[i];
682 av_log(s, AV_LOG_ERROR, "Stream %d is not mapped to an AdaptationSet\n", i);
683 return AVERROR(EINVAL);
689 static int write_manifest(AVFormatContext *s, int final)
691 DASHContext *c = s->priv_data;
693 char temp_filename[1024];
695 const char *proto = avio_find_protocol_name(s->url);
696 int use_rename = proto && !strcmp(proto, "file");
697 static unsigned int warned_non_file = 0;
698 AVDictionaryEntry *title = av_dict_get(s->metadata, "title", NULL, 0);
699 AVDictionary *opts = NULL;
701 if (!use_rename && !warned_non_file++)
702 av_log(s, AV_LOG_ERROR, "Cannot use rename on non file protocol, this may lead to races and temporary partial files\n");
704 snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", s->url);
705 set_http_options(&opts, c);
706 ret = dashenc_io_open(s, &c->mpd_out, temp_filename, &opts);
708 av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
713 avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
714 avio_printf(out, "<MPD xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
715 "\txmlns=\"urn:mpeg:dash:schema:mpd:2011\"\n"
716 "\txmlns:xlink=\"http://www.w3.org/1999/xlink\"\n"
717 "\txsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\"\n"
718 "\tprofiles=\"urn:mpeg:dash:profile:isoff-live:2011\"\n"
719 "\ttype=\"%s\"\n", final ? "static" : "dynamic");
721 avio_printf(out, "\tmediaPresentationDuration=\"");
722 write_time(out, c->total_duration);
723 avio_printf(out, "\"\n");
725 int64_t update_period = c->last_duration / AV_TIME_BASE;
727 if (c->use_template && !c->use_timeline)
729 avio_printf(out, "\tminimumUpdatePeriod=\"PT%"PRId64"S\"\n", update_period);
730 avio_printf(out, "\tsuggestedPresentationDelay=\"PT%"PRId64"S\"\n", c->last_duration / AV_TIME_BASE);
731 if (!c->availability_start_time[0] && s->nb_streams > 0 && c->streams[0].nb_segments > 0) {
732 format_date_now(c->availability_start_time, sizeof(c->availability_start_time));
734 if (c->availability_start_time[0])
735 avio_printf(out, "\tavailabilityStartTime=\"%s\"\n", c->availability_start_time);
736 format_date_now(now_str, sizeof(now_str));
738 avio_printf(out, "\tpublishTime=\"%s\"\n", now_str);
739 if (c->window_size && c->use_template) {
740 avio_printf(out, "\ttimeShiftBufferDepth=\"");
741 write_time(out, c->last_duration * c->window_size);
742 avio_printf(out, "\"\n");
745 avio_printf(out, "\tminBufferTime=\"");
746 write_time(out, c->last_duration * 2);
747 avio_printf(out, "\">\n");
748 avio_printf(out, "\t<ProgramInformation>\n");
750 char *escaped = xmlescape(title->value);
751 avio_printf(out, "\t\t<Title>%s</Title>\n", escaped);
754 avio_printf(out, "\t</ProgramInformation>\n");
756 if (c->window_size && s->nb_streams > 0 && c->streams[0].nb_segments > 0 && !c->use_template) {
757 OutputStream *os = &c->streams[0];
758 int start_index = FFMAX(os->nb_segments - c->window_size, 0);
759 int64_t start_time = av_rescale_q(os->segments[start_index]->time, s->streams[0]->time_base, AV_TIME_BASE_Q);
760 avio_printf(out, "\t<Period id=\"0\" start=\"");
761 write_time(out, start_time);
762 avio_printf(out, "\">\n");
764 avio_printf(out, "\t<Period id=\"0\" start=\"PT0.0S\">\n");
767 for (i = 0; i < c->nb_as; i++) {
768 if ((ret = write_adaptation_set(s, out, i, final)) < 0)
771 avio_printf(out, "\t</Period>\n");
773 if (c->utc_timing_url)
774 avio_printf(out, "\t<UTCTiming schemeIdUri=\"urn:mpeg:dash:utc:http-xsdate:2014\" value=\"%s\"/>\n", c->utc_timing_url);
776 avio_printf(out, "</MPD>\n");
778 dashenc_io_close(s, &c->mpd_out, temp_filename);
781 if ((ret = avpriv_io_move(temp_filename, s->url)) < 0)
785 if (c->hls_playlist && !c->master_playlist_created) {
786 char filename_hls[1024];
787 const char *audio_group = "A1";
789 int max_audio_bitrate = 0;
792 snprintf(filename_hls, sizeof(filename_hls), "%s/master.m3u8", c->dirname);
794 snprintf(filename_hls, sizeof(filename_hls), "master.m3u8");
796 snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", filename_hls);
798 set_http_options(&opts, c);
799 ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE, NULL, &opts);
801 av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
806 ff_hls_write_playlist_version(out, 6);
808 for (i = 0; i < s->nb_streams; i++) {
809 char playlist_file[64];
810 AVStream *st = s->streams[i];
811 if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
813 get_hls_playlist_name(playlist_file, sizeof(playlist_file), NULL, i);
814 ff_hls_write_audio_rendition(out, (char *)audio_group,
815 playlist_file, i, is_default);
816 max_audio_bitrate = FFMAX(st->codecpar->bit_rate, max_audio_bitrate);
820 for (i = 0; i < s->nb_streams; i++) {
821 char playlist_file[64];
822 AVStream *st = s->streams[i];
824 int stream_bitrate = st->codecpar->bit_rate;
825 if ((st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) && max_audio_bitrate) {
826 agroup = (char *)audio_group;
827 stream_bitrate += max_audio_bitrate;
829 get_hls_playlist_name(playlist_file, sizeof(playlist_file), NULL, i);
830 ff_hls_write_stream_info(st, out, stream_bitrate, playlist_file, agroup, NULL, NULL);
834 if ((ret = avpriv_io_move(temp_filename, filename_hls)) < 0)
836 c->master_playlist_created = 1;
842 static int dict_copy_entry(AVDictionary **dst, const AVDictionary *src, const char *key)
844 AVDictionaryEntry *entry = av_dict_get(src, key, NULL, 0);
846 av_dict_set(dst, key, entry->value, AV_DICT_DONT_OVERWRITE);
850 static int dash_init(AVFormatContext *s)
852 DASHContext *c = s->priv_data;
857 if (c->single_file_name)
862 av_strlcpy(c->dirname, s->url, sizeof(c->dirname));
863 ptr = strrchr(c->dirname, '/');
865 av_strlcpy(basename, &ptr[1], sizeof(basename));
868 c->dirname[0] = '\0';
869 av_strlcpy(basename, s->url, sizeof(basename));
872 ptr = strrchr(basename, '.');
876 c->streams = av_mallocz(sizeof(*c->streams) * s->nb_streams);
878 return AVERROR(ENOMEM);
880 if ((ret = parse_adaptation_sets(s)) < 0)
883 for (i = 0; i < s->nb_streams; i++) {
884 OutputStream *os = &c->streams[i];
885 AdaptationSet *as = &c->as[os->as_idx - 1];
886 AVFormatContext *ctx;
888 AVDictionary *opts = NULL;
891 os->bit_rate = s->streams[i]->codecpar->bit_rate;
893 snprintf(os->bandwidth_str, sizeof(os->bandwidth_str),
894 " bandwidth=\"%d\"", os->bit_rate);
896 int level = s->strict_std_compliance >= FF_COMPLIANCE_STRICT ?
897 AV_LOG_ERROR : AV_LOG_WARNING;
898 av_log(s, level, "No bit rate set for stream %d\n", i);
899 if (s->strict_std_compliance >= FF_COMPLIANCE_STRICT)
900 return AVERROR(EINVAL);
903 // copy AdaptationSet language and role from stream metadata
904 dict_copy_entry(&as->metadata, s->streams[i]->metadata, "language");
905 dict_copy_entry(&as->metadata, s->streams[i]->metadata, "role");
907 ctx = avformat_alloc_context();
909 return AVERROR(ENOMEM);
911 // choose muxer based on codec: webm for VP8/9 and opus, mp4 otherwise
912 // note: os->format_name is also used as part of the mimetype of the
913 // representation, e.g. video/<format_name>
914 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_VP8 ||
915 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_VP9 ||
916 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_OPUS ||
917 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_VORBIS) {
918 snprintf(os->format_name, sizeof(os->format_name), "webm");
920 snprintf(os->format_name, sizeof(os->format_name), "mp4");
922 ctx->oformat = av_guess_format(os->format_name, NULL, NULL);
924 return AVERROR_MUXER_NOT_FOUND;
926 ctx->interrupt_callback = s->interrupt_callback;
927 ctx->opaque = s->opaque;
928 ctx->io_close = s->io_close;
929 ctx->io_open = s->io_open;
931 if (!(st = avformat_new_stream(ctx, NULL)))
932 return AVERROR(ENOMEM);
933 avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
934 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
935 st->time_base = s->streams[i]->time_base;
936 st->avg_frame_rate = s->streams[i]->avg_frame_rate;
937 ctx->avoid_negative_ts = s->avoid_negative_ts;
938 ctx->flags = s->flags;
940 if ((ret = avio_open_dyn_buf(&ctx->pb)) < 0)
943 if (c->single_file) {
944 if (c->single_file_name)
945 ff_dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), c->single_file_name, i, 0, os->bit_rate, 0);
947 snprintf(os->initfile, sizeof(os->initfile), "%s-stream%d.m4s", basename, i);
949 ff_dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), c->init_seg_name, i, 0, os->bit_rate, 0);
951 snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);
952 set_http_options(&opts, c);
953 ret = s->io_open(s, &os->out, filename, AVIO_FLAG_WRITE, &opts);
957 os->init_start_pos = 0;
959 if (!strcmp(os->format_name, "mp4")) {
960 av_dict_set(&opts, "movflags", "frag_custom+dash+delay_moov", 0);
962 av_dict_set_int(&opts, "cluster_time_limit", c->min_seg_duration / 1000, 0);
963 av_dict_set_int(&opts, "cluster_size_limit", 5 * 1024 * 1024, 0); // set a large cluster size limit
964 av_dict_set_int(&opts, "dash", 1, 0);
965 av_dict_set_int(&opts, "dash_track_number", i + 1, 0);
966 av_dict_set_int(&opts, "live", 1, 0);
968 if ((ret = avformat_init_output(ctx, &opts)) < 0)
974 av_log(s, AV_LOG_VERBOSE, "Representation %d init segment will be written to: %s\n", i, filename);
976 // Flush init segment
977 // except for mp4, since delay_moov is set and the init segment
978 // is then flushed after the first packets
979 if (strcmp(os->format_name, "mp4")) {
980 flush_init_segment(s, os);
983 s->streams[i]->time_base = st->time_base;
984 // If the muxer wants to shift timestamps, request to have them shifted
985 // already before being handed to this muxer, so we don't have mismatches
986 // between the MPD and the actual segments.
987 s->avoid_negative_ts = ctx->avoid_negative_ts;
988 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
989 AVRational avg_frame_rate = s->streams[i]->avg_frame_rate;
990 if (avg_frame_rate.num > 0) {
991 if (av_cmp_q(avg_frame_rate, as->min_frame_rate) < 0)
992 as->min_frame_rate = avg_frame_rate;
993 if (av_cmp_q(as->max_frame_rate, avg_frame_rate) < 0)
994 as->max_frame_rate = avg_frame_rate;
996 as->ambiguous_frame_rate = 1;
1001 set_codec_str(s, st->codecpar, os->codec_str, sizeof(os->codec_str));
1002 os->first_pts = AV_NOPTS_VALUE;
1003 os->max_pts = AV_NOPTS_VALUE;
1004 os->last_dts = AV_NOPTS_VALUE;
1005 os->segment_index = 1;
1008 if (!c->has_video && c->min_seg_duration <= 0) {
1009 av_log(s, AV_LOG_WARNING, "no video stream and no min seg duration set\n");
1010 return AVERROR(EINVAL);
1015 static int dash_write_header(AVFormatContext *s)
1017 DASHContext *c = s->priv_data;
1019 for (i = 0; i < s->nb_streams; i++) {
1020 OutputStream *os = &c->streams[i];
1021 if ((ret = avformat_write_header(os->ctx, NULL)) < 0) {
1026 ret = write_manifest(s, 0);
1028 av_log(s, AV_LOG_VERBOSE, "Manifest written to: %s\n", s->url);
1032 static int add_segment(OutputStream *os, const char *file,
1033 int64_t time, int duration,
1034 int64_t start_pos, int64_t range_length,
1035 int64_t index_length)
1039 if (os->nb_segments >= os->segments_size) {
1040 os->segments_size = (os->segments_size + 1) * 2;
1041 if ((err = av_reallocp(&os->segments, sizeof(*os->segments) *
1042 os->segments_size)) < 0) {
1043 os->segments_size = 0;
1044 os->nb_segments = 0;
1048 seg = av_mallocz(sizeof(*seg));
1050 return AVERROR(ENOMEM);
1051 av_strlcpy(seg->file, file, sizeof(seg->file));
1053 seg->duration = duration;
1054 if (seg->time < 0) { // If pts<0, it is expected to be cut away with an edit list
1055 seg->duration += seg->time;
1058 seg->start_pos = start_pos;
1059 seg->range_length = range_length;
1060 seg->index_length = index_length;
1061 os->segments[os->nb_segments++] = seg;
1062 os->segment_index++;
1066 static void write_styp(AVIOContext *pb)
1069 ffio_wfourcc(pb, "styp");
1070 ffio_wfourcc(pb, "msdh");
1071 avio_wb32(pb, 0); /* minor */
1072 ffio_wfourcc(pb, "msdh");
1073 ffio_wfourcc(pb, "msix");
1076 static void find_index_range(AVFormatContext *s, const char *full_path,
1077 int64_t pos, int *index_length)
1083 ret = s->io_open(s, &pb, full_path, AVIO_FLAG_READ, NULL);
1086 if (avio_seek(pb, pos, SEEK_SET) != pos) {
1087 ff_format_io_close(s, &pb);
1090 ret = avio_read(pb, buf, 8);
1091 ff_format_io_close(s, &pb);
1094 if (AV_RL32(&buf[4]) != MKTAG('s', 'i', 'd', 'x'))
1096 *index_length = AV_RB32(&buf[0]);
1099 static int update_stream_extradata(AVFormatContext *s, OutputStream *os,
1100 AVCodecParameters *par)
1104 if (os->ctx->streams[0]->codecpar->extradata_size || !par->extradata_size)
1107 extradata = av_malloc(par->extradata_size);
1110 return AVERROR(ENOMEM);
1112 memcpy(extradata, par->extradata, par->extradata_size);
1114 os->ctx->streams[0]->codecpar->extradata = extradata;
1115 os->ctx->streams[0]->codecpar->extradata_size = par->extradata_size;
1117 set_codec_str(s, par, os->codec_str, sizeof(os->codec_str));
1122 static int dash_flush(AVFormatContext *s, int final, int stream)
1124 DASHContext *c = s->priv_data;
1127 const char *proto = avio_find_protocol_name(s->url);
1128 int use_rename = proto && !strcmp(proto, "file");
1130 int cur_flush_segment_index = 0;
1132 cur_flush_segment_index = c->streams[stream].segment_index;
1134 for (i = 0; i < s->nb_streams; i++) {
1135 OutputStream *os = &c->streams[i];
1136 AVStream *st = s->streams[i];
1137 char filename[1024] = "", full_path[1024], temp_path[1024];
1138 int range_length, index_length = 0;
1140 if (!os->packets_written)
1143 // Flush the single stream that got a keyframe right now.
1144 // Flush all audio streams as well, in sync with video keyframes,
1145 // but not the other video streams.
1146 if (stream >= 0 && i != stream) {
1147 if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
1149 // Make sure we don't flush audio streams multiple times, when
1150 // all video streams are flushed one at a time.
1151 if (c->has_video && os->segment_index > cur_flush_segment_index)
1155 if (!os->init_range_length) {
1156 flush_init_segment(s, os);
1159 if (!c->single_file) {
1160 AVDictionary *opts = NULL;
1161 ff_dash_fill_tmpl_params(filename, sizeof(filename), c->media_seg_name, i, os->segment_index, os->bit_rate, os->start_pts);
1162 snprintf(full_path, sizeof(full_path), "%s%s", c->dirname, filename);
1163 snprintf(temp_path, sizeof(temp_path), use_rename ? "%s.tmp" : "%s", full_path);
1164 set_http_options(&opts, c);
1165 ret = dashenc_io_open(s, &os->out, temp_path, &opts);
1168 av_dict_free(&opts);
1169 if (!strcmp(os->format_name, "mp4"))
1170 write_styp(os->ctx->pb);
1172 snprintf(full_path, sizeof(full_path), "%s%s", c->dirname, os->initfile);
1175 ret = flush_dynbuf(os, &range_length);
1178 os->packets_written = 0;
1180 if (c->single_file) {
1181 find_index_range(s, full_path, os->pos, &index_length);
1183 dashenc_io_close(s, &os->out, temp_path);
1186 ret = avpriv_io_move(temp_path, full_path);
1192 if (!os->bit_rate) {
1193 // calculate average bitrate of first segment
1194 int64_t bitrate = (int64_t) range_length * 8 * AV_TIME_BASE / av_rescale_q(os->max_pts - os->start_pts,
1198 os->bit_rate = bitrate;
1199 snprintf(os->bandwidth_str, sizeof(os->bandwidth_str),
1200 " bandwidth=\"%d\"", os->bit_rate);
1203 add_segment(os, filename, os->start_pts, os->max_pts - os->start_pts, os->pos, range_length, index_length);
1204 av_log(s, AV_LOG_VERBOSE, "Representation %d media segment %d written to: %s\n", i, os->segment_index, full_path);
1206 os->pos += range_length;
1209 if (c->window_size || (final && c->remove_at_exit)) {
1210 for (i = 0; i < s->nb_streams; i++) {
1211 OutputStream *os = &c->streams[i];
1213 int remove = os->nb_segments - c->window_size - c->extra_window_size;
1214 if (final && c->remove_at_exit)
1215 remove = os->nb_segments;
1217 for (j = 0; j < remove; j++) {
1218 char filename[1024];
1219 snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->segments[j]->file);
1221 av_free(os->segments[j]);
1223 os->nb_segments -= remove;
1224 memmove(os->segments, os->segments + remove, os->nb_segments * sizeof(*os->segments));
1230 ret = write_manifest(s, final);
1234 static int dash_write_packet(AVFormatContext *s, AVPacket *pkt)
1236 DASHContext *c = s->priv_data;
1237 AVStream *st = s->streams[pkt->stream_index];
1238 OutputStream *os = &c->streams[pkt->stream_index];
1241 ret = update_stream_extradata(s, os, st->codecpar);
1245 // Fill in a heuristic guess of the packet duration, if none is available.
1246 // The mp4 muxer will do something similar (for the last packet in a fragment)
1247 // if nothing is set (setting it for the other packets doesn't hurt).
1248 // By setting a nonzero duration here, we can be sure that the mp4 muxer won't
1249 // invoke its heuristic (this doesn't have to be identical to that algorithm),
1250 // so that we know the exact timestamps of fragments.
1251 if (!pkt->duration && os->last_dts != AV_NOPTS_VALUE)
1252 pkt->duration = pkt->dts - os->last_dts;
1253 os->last_dts = pkt->dts;
1255 // If forcing the stream to start at 0, the mp4 muxer will set the start
1256 // timestamps to 0. Do the same here, to avoid mismatches in duration/timestamps.
1257 if (os->first_pts == AV_NOPTS_VALUE &&
1258 s->avoid_negative_ts == AVFMT_AVOID_NEG_TS_MAKE_ZERO) {
1259 pkt->pts -= pkt->dts;
1263 if (os->first_pts == AV_NOPTS_VALUE)
1264 os->first_pts = pkt->pts;
1266 if ((!c->has_video || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) &&
1267 pkt->flags & AV_PKT_FLAG_KEY && os->packets_written &&
1268 av_compare_ts(pkt->pts - os->start_pts, st->time_base,
1269 c->min_seg_duration, AV_TIME_BASE_Q) >= 0) {
1270 int64_t prev_duration = c->last_duration;
1272 c->last_duration = av_rescale_q(pkt->pts - os->start_pts,
1275 c->total_duration = av_rescale_q(pkt->pts - os->first_pts,
1279 if ((!c->use_timeline || !c->use_template) && prev_duration) {
1280 if (c->last_duration < prev_duration*9/10 ||
1281 c->last_duration > prev_duration*11/10) {
1282 av_log(s, AV_LOG_WARNING,
1283 "Segment durations differ too much, enable use_timeline "
1284 "and use_template, or keep a stricter keyframe interval\n");
1288 if ((ret = dash_flush(s, 0, pkt->stream_index)) < 0)
1292 if (!os->packets_written) {
1293 // If we wrote a previous segment, adjust the start time of the segment
1294 // to the end of the previous one (which is the same as the mp4 muxer
1295 // does). This avoids gaps in the timeline.
1296 if (os->max_pts != AV_NOPTS_VALUE)
1297 os->start_pts = os->max_pts;
1299 os->start_pts = pkt->pts;
1301 if (os->max_pts == AV_NOPTS_VALUE)
1302 os->max_pts = pkt->pts + pkt->duration;
1304 os->max_pts = FFMAX(os->max_pts, pkt->pts + pkt->duration);
1305 os->packets_written++;
1306 return ff_write_chained(os->ctx, 0, pkt, s, 0);
1309 static int dash_write_trailer(AVFormatContext *s)
1311 DASHContext *c = s->priv_data;
1313 if (s->nb_streams > 0) {
1314 OutputStream *os = &c->streams[0];
1315 // If no segments have been written so far, try to do a crude
1316 // guess of the segment duration
1317 if (!c->last_duration)
1318 c->last_duration = av_rescale_q(os->max_pts - os->start_pts,
1319 s->streams[0]->time_base,
1321 c->total_duration = av_rescale_q(os->max_pts - os->first_pts,
1322 s->streams[0]->time_base,
1325 dash_flush(s, 1, -1);
1327 if (c->remove_at_exit) {
1328 char filename[1024];
1330 for (i = 0; i < s->nb_streams; i++) {
1331 OutputStream *os = &c->streams[i];
1332 snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);
1341 static int dash_check_bitstream(struct AVFormatContext *s, const AVPacket *avpkt)
1343 DASHContext *c = s->priv_data;
1344 OutputStream *os = &c->streams[avpkt->stream_index];
1345 AVFormatContext *oc = os->ctx;
1346 if (oc->oformat->check_bitstream) {
1348 AVPacket pkt = *avpkt;
1349 pkt.stream_index = 0;
1350 ret = oc->oformat->check_bitstream(oc, &pkt);
1352 AVStream *st = s->streams[avpkt->stream_index];
1353 AVStream *ost = oc->streams[0];
1354 st->internal->bsfcs = ost->internal->bsfcs;
1355 st->internal->nb_bsfcs = ost->internal->nb_bsfcs;
1356 ost->internal->bsfcs = NULL;
1357 ost->internal->nb_bsfcs = 0;
1364 #define OFFSET(x) offsetof(DASHContext, x)
1365 #define E AV_OPT_FLAG_ENCODING_PARAM
1366 static const AVOption options[] = {
1367 { "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 },
1368 { "window_size", "number of segments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },
1369 { "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 },
1370 { "min_seg_duration", "minimum segment duration (in microseconds)", OFFSET(min_seg_duration), AV_OPT_TYPE_INT, { .i64 = 5000000 }, 0, INT_MAX, E },
1371 { "remove_at_exit", "remove all segments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
1372 { "use_template", "Use SegmentTemplate instead of SegmentList", OFFSET(use_template), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, E },
1373 { "use_timeline", "Use SegmentTimeline in SegmentTemplate", OFFSET(use_timeline), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, E },
1374 { "single_file", "Store all segments in one file, accessed using byte ranges", OFFSET(single_file), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
1375 { "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 },
1376 { "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 },
1377 { "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 },
1378 { "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 },
1379 { "http_user_agent", "override User-Agent field in HTTP header", OFFSET(user_agent), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
1380 { "http_persistent", "Use persistent HTTP connections", OFFSET(http_persistent), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
1381 { "hls_playlist", "Generate HLS playlist files(master.m3u8, media_%d.m3u8)", OFFSET(hls_playlist), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
1385 static const AVClass dash_class = {
1386 .class_name = "dash muxer",
1387 .item_name = av_default_item_name,
1389 .version = LIBAVUTIL_VERSION_INT,
1392 AVOutputFormat ff_dash_muxer = {
1394 .long_name = NULL_IF_CONFIG_SMALL("DASH Muxer"),
1395 .extensions = "mpd",
1396 .priv_data_size = sizeof(DASHContext),
1397 .audio_codec = AV_CODEC_ID_AAC,
1398 .video_codec = AV_CODEC_ID_H264,
1399 .flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE | AVFMT_TS_NEGATIVE,
1401 .write_header = dash_write_header,
1402 .write_packet = dash_write_packet,
1403 .write_trailer = dash_write_trailer,
1404 .deinit = dash_free,
1405 .check_bitstream = dash_check_bitstream,
1406 .priv_class = &dash_class,