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.h"
36 #include "libavutil/time_internal.h"
41 #include "avio_internal.h"
42 #include "hlsplaylist.h"
43 #if CONFIG_HTTP_PROTOCOL
48 #include "os_support.h"
54 SEGMENT_TYPE_AUTO = 0,
60 typedef struct Segment {
63 int range_length, index_length;
65 double prog_date_time;
70 typedef struct AdaptationSet {
73 enum AVMediaType media_type;
74 AVDictionary *metadata;
75 AVRational min_frame_rate, max_frame_rate;
76 int ambiguous_frame_rate;
79 typedef struct OutputStream {
81 int ctx_inited, as_idx;
85 int64_t init_start_pos, pos;
86 int init_range_length;
87 int nb_segments, segments_size, segment_index;
89 int64_t first_pts, start_pts, max_pts;
90 int64_t last_dts, last_pts;
92 SegmentType segment_type; /* segment type selected for this particular stream */
93 const char *format_name;
94 const char *extension_name;
95 const char *single_file_name; /* file names selected for this particular stream */
96 const char *init_seg_name;
97 const char *media_seg_name;
102 char full_path[1024];
103 char temp_path[1024];
104 double availability_time_offset;
109 typedef struct DASHContext {
110 const AVClass *class; /* Class for private options. */
111 char *adaptation_sets;
115 int extra_window_size;
116 #if FF_API_DASH_MIN_SEG_DURATION
117 int min_seg_duration;
119 int64_t seg_duration;
124 OutputStream *streams;
126 int64_t last_duration;
127 int64_t total_duration;
128 char availability_start_time[100];
131 const char *single_file_name; /* file names as specified in options */
132 const char *init_seg_name;
133 const char *media_seg_name;
134 const char *utc_timing_url;
136 const char *user_agent;
139 int master_playlist_created;
140 AVIOContext *mpd_out;
141 AVIOContext *m3u8_out;
144 int index_correction;
145 char *format_options_str;
147 SegmentType segment_type_option; /* segment type as specified in options */
148 int ignore_io_errors;
150 int master_publish_rate;
151 int nr_of_streams_to_flush;
152 int nr_of_streams_flushed;
155 static struct codec_string {
159 { AV_CODEC_ID_VP8, "vp8" },
160 { AV_CODEC_ID_VP9, "vp9" },
161 { AV_CODEC_ID_VORBIS, "vorbis" },
162 { AV_CODEC_ID_OPUS, "opus" },
163 { AV_CODEC_ID_FLAC, "flac" },
167 static struct format_string {
168 SegmentType segment_type;
171 { SEGMENT_TYPE_AUTO, "auto" },
172 { SEGMENT_TYPE_MP4, "mp4" },
173 { SEGMENT_TYPE_WEBM, "webm" },
177 static int dashenc_io_open(AVFormatContext *s, AVIOContext **pb, char *filename,
178 AVDictionary **options) {
179 DASHContext *c = s->priv_data;
180 int http_base_proto = filename ? ff_is_http_proto(filename) : 0;
181 int err = AVERROR_MUXER_NOT_FOUND;
182 if (!*pb || !http_base_proto || !c->http_persistent) {
183 err = s->io_open(s, pb, filename, AVIO_FLAG_WRITE, options);
184 #if CONFIG_HTTP_PROTOCOL
186 URLContext *http_url_context = ffio_geturlcontext(*pb);
187 av_assert0(http_url_context);
188 err = ff_http_do_new_request(http_url_context, filename);
190 ff_format_io_close(s, pb);
196 static void dashenc_io_close(AVFormatContext *s, AVIOContext **pb, char *filename) {
197 DASHContext *c = s->priv_data;
198 int http_base_proto = filename ? ff_is_http_proto(filename) : 0;
203 if (!http_base_proto || !c->http_persistent) {
204 ff_format_io_close(s, pb);
205 #if CONFIG_HTTP_PROTOCOL
207 URLContext *http_url_context = ffio_geturlcontext(*pb);
208 av_assert0(http_url_context);
210 ffurl_shutdown(http_url_context, AVIO_FLAG_WRITE);
215 static const char *get_format_str(SegmentType segment_type) {
217 for (i = 0; i < SEGMENT_TYPE_NB; i++)
218 if (formats[i].segment_type == segment_type)
219 return formats[i].str;
223 static const char *get_extension_str(SegmentType type, int single_file)
227 case SEGMENT_TYPE_MP4: return single_file ? "mp4" : "m4s";
228 case SEGMENT_TYPE_WEBM: return "webm";
229 default: return NULL;
233 static int handle_io_open_error(AVFormatContext *s, int err, char *url) {
234 DASHContext *c = s->priv_data;
235 char errbuf[AV_ERROR_MAX_STRING_SIZE];
236 av_strerror(err, errbuf, sizeof(errbuf));
237 av_log(s, c->ignore_io_errors ? AV_LOG_WARNING : AV_LOG_ERROR,
238 "Unable to open %s for writing: %s\n", url, errbuf);
239 return c->ignore_io_errors ? 0 : err;
242 static inline SegmentType select_segment_type(SegmentType segment_type, enum AVCodecID codec_id)
244 if (segment_type == SEGMENT_TYPE_AUTO) {
245 if (codec_id == AV_CODEC_ID_OPUS || codec_id == AV_CODEC_ID_VORBIS ||
246 codec_id == AV_CODEC_ID_VP8 || codec_id == AV_CODEC_ID_VP9) {
247 segment_type = SEGMENT_TYPE_WEBM;
249 segment_type = SEGMENT_TYPE_MP4;
256 static int init_segment_types(AVFormatContext *s)
258 DASHContext *c = s->priv_data;
259 int has_mp4_streams = 0;
260 for (int i = 0; i < s->nb_streams; ++i) {
261 OutputStream *os = &c->streams[i];
262 SegmentType segment_type = select_segment_type(
263 c->segment_type_option, s->streams[i]->codecpar->codec_id);
264 os->segment_type = segment_type;
265 os->format_name = get_format_str(segment_type);
266 if (!os->format_name) {
267 av_log(s, AV_LOG_ERROR, "Could not select DASH segment type for stream %d\n", i);
268 return AVERROR_MUXER_NOT_FOUND;
270 os->extension_name = get_extension_str(segment_type, c->single_file);
271 if (!os->extension_name) {
272 av_log(s, AV_LOG_ERROR, "Could not get extension type for stream %d\n", i);
273 return AVERROR_MUXER_NOT_FOUND;
276 has_mp4_streams |= segment_type == SEGMENT_TYPE_MP4;
279 if (c->hls_playlist && !has_mp4_streams) {
280 av_log(s, AV_LOG_WARNING, "No mp4 streams, disabling HLS manifest generation\n");
287 static int check_file_extension(const char *filename, const char *extension) {
289 if (!filename || !extension)
291 dot = strrchr(filename, '.');
292 if (dot && !strcmp(dot + 1, extension))
297 static void set_vp9_codec_str(AVFormatContext *s, AVCodecParameters *par,
298 AVRational *frame_rate, char *str, int size) {
300 int ret = ff_isom_get_vpcc_features(s, par, frame_rate, &vpcc);
302 av_strlcatf(str, size, "vp09.%02d.%02d.%02d",
303 vpcc.profile, vpcc.level, vpcc.bitdepth);
305 // Default to just vp9 in case of error while finding out profile or level
306 av_log(s, AV_LOG_WARNING, "Could not find VP9 profile and/or level\n");
307 av_strlcpy(str, "vp9", size);
312 static void set_codec_str(AVFormatContext *s, AVCodecParameters *par,
313 AVRational *frame_rate, char *str, int size)
315 const AVCodecTag *tags[2] = { NULL, NULL };
319 // common Webm codecs are not part of RFC 6381
320 for (i = 0; codecs[i].id; i++)
321 if (codecs[i].id == par->codec_id) {
322 if (codecs[i].id == AV_CODEC_ID_VP9) {
323 set_vp9_codec_str(s, par, frame_rate, str, size);
325 av_strlcpy(str, codecs[i].str, size);
330 // for codecs part of RFC 6381
331 if (par->codec_type == AVMEDIA_TYPE_VIDEO)
332 tags[0] = ff_codec_movvideo_tags;
333 else if (par->codec_type == AVMEDIA_TYPE_AUDIO)
334 tags[0] = ff_codec_movaudio_tags;
338 tag = par->codec_tag;
340 tag = av_codec_get_tag(tags, par->codec_id);
348 if (!strcmp(str, "mp4a") || !strcmp(str, "mp4v")) {
350 tags[0] = ff_mp4_obj_type;
351 oti = av_codec_get_tag(tags, par->codec_id);
353 av_strlcatf(str, size, ".%02"PRIx32, oti);
357 if (tag == MKTAG('m', 'p', '4', 'a')) {
358 if (par->extradata_size >= 2) {
359 int aot = par->extradata[0] >> 3;
361 aot = ((AV_RB16(par->extradata) >> 5) & 0x3f) + 32;
362 av_strlcatf(str, size, ".%d", aot);
364 } else if (tag == MKTAG('m', 'p', '4', 'v')) {
365 // Unimplemented, should output ProfileLevelIndication as a decimal number
366 av_log(s, AV_LOG_WARNING, "Incomplete RFC 6381 codec string for mp4v\n");
368 } else if (!strcmp(str, "avc1")) {
369 uint8_t *tmpbuf = NULL;
370 uint8_t *extradata = par->extradata;
371 int extradata_size = par->extradata_size;
374 if (extradata[0] != 1) {
376 if (avio_open_dyn_buf(&pb) < 0)
378 if (ff_isom_write_avcc(pb, extradata, extradata_size) < 0) {
379 ffio_free_dyn_buf(&pb);
382 extradata_size = avio_close_dyn_buf(pb, &extradata);
386 if (extradata_size >= 4)
387 av_strlcatf(str, size, ".%02x%02x%02x",
388 extradata[1], extradata[2], extradata[3]);
390 } else if (!strcmp(str, "av01")) {
391 AV1SequenceParameters seq;
392 if (!par->extradata_size)
394 if (ff_av1_parse_seq_header(&seq, par->extradata, par->extradata_size) < 0)
397 av_strlcatf(str, size, ".%01u.%02u%s.%02u",
398 seq.profile, seq.level, seq.tier ? "H" : "M", seq.bitdepth);
399 if (seq.color_description_present_flag)
400 av_strlcatf(str, size, ".%01u.%01u%01u%01u.%02u.%02u.%02u.%01u",
402 seq.chroma_subsampling_x, seq.chroma_subsampling_y, seq.chroma_sample_position,
403 seq.color_primaries, seq.transfer_characteristics, seq.matrix_coefficients,
408 static int flush_dynbuf(DASHContext *c, OutputStream *os, int *range_length)
413 return AVERROR(EINVAL);
417 av_write_frame(os->ctx, NULL);
418 avio_flush(os->ctx->pb);
420 if (!c->single_file) {
422 *range_length = avio_close_dyn_buf(os->ctx->pb, &buffer);
425 avio_write(os->out, buffer + os->written_len, *range_length - os->written_len);
430 return avio_open_dyn_buf(&os->ctx->pb);
432 *range_length = avio_tell(os->ctx->pb) - os->pos;
437 static void set_http_options(AVDictionary **options, DASHContext *c)
440 av_dict_set(options, "method", c->method, 0);
442 av_dict_set(options, "user_agent", c->user_agent, 0);
443 if (c->http_persistent)
444 av_dict_set_int(options, "multiple_requests", 1, 0);
446 av_dict_set_int(options, "timeout", c->timeout, 0);
449 static void get_hls_playlist_name(char *playlist_name, int string_size,
450 const char *base_url, int id) {
452 snprintf(playlist_name, string_size, "%smedia_%d.m3u8", base_url, id);
454 snprintf(playlist_name, string_size, "media_%d.m3u8", id);
457 static void get_start_index_number(OutputStream *os, DASHContext *c,
458 int *start_index, int *start_number) {
461 if (c->window_size) {
462 *start_index = FFMAX(os->nb_segments - c->window_size, 0);
463 *start_number = FFMAX(os->segment_index - c->window_size, 1);
467 static void write_hls_media_playlist(OutputStream *os, AVFormatContext *s,
468 int representation_id, int final,
469 char *prefetch_url) {
470 DASHContext *c = s->priv_data;
471 int timescale = os->ctx->streams[0]->time_base.den;
472 char temp_filename_hls[1024];
473 char filename_hls[1024];
474 AVDictionary *http_opts = NULL;
475 int target_duration = 0;
477 const char *proto = avio_find_protocol_name(c->dirname);
478 int use_rename = proto && !strcmp(proto, "file");
479 int i, start_index, start_number;
480 double prog_date_time = 0;
482 get_start_index_number(os, c, &start_index, &start_number);
484 if (!c->hls_playlist || start_index >= os->nb_segments ||
485 os->segment_type != SEGMENT_TYPE_MP4)
488 get_hls_playlist_name(filename_hls, sizeof(filename_hls),
489 c->dirname, representation_id);
491 snprintf(temp_filename_hls, sizeof(temp_filename_hls), use_rename ? "%s.tmp" : "%s", filename_hls);
493 set_http_options(&http_opts, c);
494 ret = dashenc_io_open(s, &c->m3u8_out, temp_filename_hls, &http_opts);
495 av_dict_free(&http_opts);
497 handle_io_open_error(s, ret, temp_filename_hls);
500 for (i = start_index; i < os->nb_segments; i++) {
501 Segment *seg = os->segments[i];
502 double duration = (double) seg->duration / timescale;
503 if (target_duration <= duration)
504 target_duration = lrint(duration);
507 ff_hls_write_playlist_header(c->m3u8_out, 6, -1, target_duration,
508 start_number, PLAYLIST_TYPE_NONE, 0);
510 ff_hls_write_init_file(c->m3u8_out, os->initfile, c->single_file,
511 os->init_range_length, os->init_start_pos);
513 for (i = start_index; i < os->nb_segments; i++) {
514 Segment *seg = os->segments[i];
516 if (prog_date_time == 0) {
517 if (os->nb_segments == 1)
518 prog_date_time = c->start_time_s;
520 prog_date_time = seg->prog_date_time;
522 seg->prog_date_time = prog_date_time;
524 ret = ff_hls_write_file_entry(c->m3u8_out, 0, c->single_file,
525 (double) seg->duration / timescale, 0,
526 seg->range_length, seg->start_pos, NULL,
527 c->single_file ? os->initfile : seg->file,
528 &prog_date_time, 0, 0, 0);
530 av_log(os->ctx, AV_LOG_WARNING, "ff_hls_write_file_entry get error\n");
535 avio_printf(c->m3u8_out, "#EXT-X-PREFETCH:%s\n", prefetch_url);
538 ff_hls_write_end_list(c->m3u8_out);
540 dashenc_io_close(s, &c->m3u8_out, temp_filename_hls);
543 if (avpriv_io_move(temp_filename_hls, filename_hls) < 0) {
544 av_log(os->ctx, AV_LOG_WARNING, "renaming file %s to %s failed\n\n", temp_filename_hls, filename_hls);
548 static int flush_init_segment(AVFormatContext *s, OutputStream *os)
550 DASHContext *c = s->priv_data;
551 int ret, range_length;
553 ret = flush_dynbuf(c, os, &range_length);
557 os->pos = os->init_range_length = range_length;
558 if (!c->single_file) {
560 snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);
561 dashenc_io_close(s, &os->out, filename);
566 static void dash_free(AVFormatContext *s)
568 DASHContext *c = s->priv_data;
572 for (i = 0; i < c->nb_as; i++) {
573 av_dict_free(&c->as[i].metadata);
574 av_freep(&c->as[i].descriptor);
582 for (i = 0; i < s->nb_streams; i++) {
583 OutputStream *os = &c->streams[i];
584 if (os->ctx && os->ctx->pb) {
586 ffio_free_dyn_buf(&os->ctx->pb);
588 avio_close(os->ctx->pb);
590 ff_format_io_close(s, &os->out);
592 avformat_free_context(os->ctx);
593 for (j = 0; j < os->nb_segments; j++)
594 av_free(os->segments[j]);
595 av_free(os->segments);
596 av_freep(&os->single_file_name);
597 av_freep(&os->init_seg_name);
598 av_freep(&os->media_seg_name);
600 av_freep(&c->streams);
602 ff_format_io_close(s, &c->mpd_out);
603 ff_format_io_close(s, &c->m3u8_out);
606 static void output_segment_list(OutputStream *os, AVIOContext *out, AVFormatContext *s,
607 int representation_id, int final)
609 DASHContext *c = s->priv_data;
610 int i, start_index, start_number;
611 get_start_index_number(os, c, &start_index, &start_number);
613 if (c->use_template) {
614 int timescale = c->use_timeline ? os->ctx->streams[0]->time_base.den : AV_TIME_BASE;
615 avio_printf(out, "\t\t\t\t<SegmentTemplate timescale=\"%d\" ", timescale);
616 if (!c->use_timeline) {
617 avio_printf(out, "duration=\"%"PRId64"\" ", c->seg_duration);
618 if (c->streaming && os->availability_time_offset)
619 avio_printf(out, "availabilityTimeOffset=\"%.3f\" ",
620 os->availability_time_offset);
622 avio_printf(out, "initialization=\"%s\" media=\"%s\" startNumber=\"%d\">\n", os->init_seg_name, os->media_seg_name, c->use_timeline ? start_number : 1);
623 if (c->use_timeline) {
624 int64_t cur_time = 0;
625 avio_printf(out, "\t\t\t\t\t<SegmentTimeline>\n");
626 for (i = start_index; i < os->nb_segments; ) {
627 Segment *seg = os->segments[i];
629 avio_printf(out, "\t\t\t\t\t\t<S ");
630 if (i == start_index || seg->time != cur_time) {
631 cur_time = seg->time;
632 avio_printf(out, "t=\"%"PRId64"\" ", seg->time);
634 avio_printf(out, "d=\"%"PRId64"\" ", seg->duration);
635 while (i + repeat + 1 < os->nb_segments &&
636 os->segments[i + repeat + 1]->duration == seg->duration &&
637 os->segments[i + repeat + 1]->time == os->segments[i + repeat]->time + os->segments[i + repeat]->duration)
640 avio_printf(out, "r=\"%d\" ", repeat);
641 avio_printf(out, "/>\n");
643 cur_time += (1 + repeat) * seg->duration;
645 avio_printf(out, "\t\t\t\t\t</SegmentTimeline>\n");
647 avio_printf(out, "\t\t\t\t</SegmentTemplate>\n");
648 } else if (c->single_file) {
649 avio_printf(out, "\t\t\t\t<BaseURL>%s</BaseURL>\n", os->initfile);
650 avio_printf(out, "\t\t\t\t<SegmentList timescale=\"%d\" duration=\"%"PRId64"\" startNumber=\"%d\">\n", AV_TIME_BASE, c->last_duration, start_number);
651 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);
652 for (i = start_index; i < os->nb_segments; i++) {
653 Segment *seg = os->segments[i];
654 avio_printf(out, "\t\t\t\t\t<SegmentURL mediaRange=\"%"PRId64"-%"PRId64"\" ", seg->start_pos, seg->start_pos + seg->range_length - 1);
655 if (seg->index_length)
656 avio_printf(out, "indexRange=\"%"PRId64"-%"PRId64"\" ", seg->start_pos, seg->start_pos + seg->index_length - 1);
657 avio_printf(out, "/>\n");
659 avio_printf(out, "\t\t\t\t</SegmentList>\n");
661 avio_printf(out, "\t\t\t\t<SegmentList timescale=\"%d\" duration=\"%"PRId64"\" startNumber=\"%d\">\n", AV_TIME_BASE, c->last_duration, start_number);
662 avio_printf(out, "\t\t\t\t\t<Initialization sourceURL=\"%s\" />\n", os->initfile);
663 for (i = start_index; i < os->nb_segments; i++) {
664 Segment *seg = os->segments[i];
665 avio_printf(out, "\t\t\t\t\t<SegmentURL media=\"%s\" />\n", seg->file);
667 avio_printf(out, "\t\t\t\t</SegmentList>\n");
669 if (!c->lhls || final) {
670 write_hls_media_playlist(os, s, representation_id, final, NULL);
675 static char *xmlescape(const char *str) {
676 int outlen = strlen(str)*3/2 + 6;
677 char *out = av_realloc(NULL, outlen + 1);
681 for (; *str; str++) {
682 if (pos + 6 > outlen) {
684 outlen = 2 * outlen + 6;
685 tmp = av_realloc(out, outlen + 1);
693 memcpy(&out[pos], "&", 5);
695 } else if (*str == '<') {
696 memcpy(&out[pos], "<", 4);
698 } else if (*str == '>') {
699 memcpy(&out[pos], ">", 4);
701 } else if (*str == '\'') {
702 memcpy(&out[pos], "'", 6);
704 } else if (*str == '\"') {
705 memcpy(&out[pos], """, 6);
715 static void write_time(AVIOContext *out, int64_t time)
717 int seconds = time / AV_TIME_BASE;
718 int fractions = time % AV_TIME_BASE;
719 int minutes = seconds / 60;
720 int hours = minutes / 60;
723 avio_printf(out, "PT");
725 avio_printf(out, "%dH", hours);
726 if (hours || minutes)
727 avio_printf(out, "%dM", minutes);
728 avio_printf(out, "%d.%dS", seconds, fractions / (AV_TIME_BASE / 10));
731 static void format_date_now(char *buf, int size)
733 struct tm *ptm, tmbuf;
734 int64_t time_us = av_gettime();
735 int64_t time_ms = time_us / 1000;
736 const time_t time_s = time_ms / 1000;
737 int millisec = time_ms - (time_s * 1000);
738 ptm = gmtime_r(&time_s, &tmbuf);
741 if (!strftime(buf, size, "%Y-%m-%dT%H:%M:%S", ptm)) {
746 snprintf(buf + len, size - len, ".%03dZ", millisec);
750 static int write_adaptation_set(AVFormatContext *s, AVIOContext *out, int as_index,
753 DASHContext *c = s->priv_data;
754 AdaptationSet *as = &c->as[as_index];
755 AVDictionaryEntry *lang, *role;
758 avio_printf(out, "\t\t<AdaptationSet id=\"%s\" contentType=\"%s\" segmentAlignment=\"true\" bitstreamSwitching=\"true\"",
759 as->id, as->media_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
760 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)
761 avio_printf(out, " maxFrameRate=\"%d/%d\"", as->max_frame_rate.num, as->max_frame_rate.den);
762 lang = av_dict_get(as->metadata, "language", NULL, 0);
764 avio_printf(out, " lang=\"%s\"", lang->value);
765 avio_printf(out, ">\n");
767 role = av_dict_get(as->metadata, "role", NULL, 0);
769 avio_printf(out, "\t\t\t<Role schemeIdUri=\"urn:mpeg:dash:role:2011\" value=\"%s\"/>\n", role->value);
771 avio_printf(out, "\t\t\t%s\n", as->descriptor);
772 for (i = 0; i < s->nb_streams; i++) {
773 OutputStream *os = &c->streams[i];
774 char bandwidth_str[64] = {'\0'};
776 if (os->as_idx - 1 != as_index)
779 if (os->bit_rate > 0)
780 snprintf(bandwidth_str, sizeof(bandwidth_str), " bandwidth=\"%d\"",
783 if (as->media_type == AVMEDIA_TYPE_VIDEO) {
784 AVStream *st = s->streams[i];
785 avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"video/%s\" codecs=\"%s\"%s width=\"%d\" height=\"%d\"",
786 i, os->format_name, os->codec_str, bandwidth_str, s->streams[i]->codecpar->width, s->streams[i]->codecpar->height);
787 if (st->avg_frame_rate.num)
788 avio_printf(out, " frameRate=\"%d/%d\"", st->avg_frame_rate.num, st->avg_frame_rate.den);
789 avio_printf(out, ">\n");
791 avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"audio/%s\" codecs=\"%s\"%s audioSamplingRate=\"%d\">\n",
792 i, os->format_name, os->codec_str, bandwidth_str, s->streams[i]->codecpar->sample_rate);
793 avio_printf(out, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n",
794 s->streams[i]->codecpar->channels);
796 output_segment_list(os, out, s, i, final);
797 avio_printf(out, "\t\t\t</Representation>\n");
799 avio_printf(out, "\t\t</AdaptationSet>\n");
804 static int add_adaptation_set(AVFormatContext *s, AdaptationSet **as, enum AVMediaType type)
806 DASHContext *c = s->priv_data;
808 void *mem = av_realloc(c->as, sizeof(*c->as) * (c->nb_as + 1));
810 return AVERROR(ENOMEM);
814 *as = &c->as[c->nb_as - 1];
815 memset(*as, 0, sizeof(**as));
816 (*as)->media_type = type;
821 static int adaptation_set_add_stream(AVFormatContext *s, int as_idx, int i)
823 DASHContext *c = s->priv_data;
824 AdaptationSet *as = &c->as[as_idx - 1];
825 OutputStream *os = &c->streams[i];
827 if (as->media_type != s->streams[i]->codecpar->codec_type) {
828 av_log(s, AV_LOG_ERROR, "Codec type of stream %d doesn't match AdaptationSet's media type\n", i);
829 return AVERROR(EINVAL);
830 } else if (os->as_idx) {
831 av_log(s, AV_LOG_ERROR, "Stream %d is already assigned to an AdaptationSet\n", i);
832 return AVERROR(EINVAL);
839 static int parse_adaptation_sets(AVFormatContext *s)
841 DASHContext *c = s->priv_data;
842 const char *p = c->adaptation_sets;
843 enum { new_set, parse_id, parsing_streams, parse_descriptor } state;
847 // default: one AdaptationSet for each stream
849 for (i = 0; i < s->nb_streams; i++) {
850 if ((ret = add_adaptation_set(s, &as, s->streams[i]->codecpar->codec_type)) < 0)
852 snprintf(as->id, sizeof(as->id), "%d", i);
854 c->streams[i].as_idx = c->nb_as;
859 // syntax id=0,streams=0,1,2 id=1,streams=3,4 and so on
860 // option id=0,descriptor=descriptor_str,streams=0,1,2 and so on
861 // descriptor is useful to the scheme defined by ISO/IEC 23009-1:2014/Amd.2:2015
862 // descriptor_str should be a self-closing xml tag.
868 } else if (state == new_set && av_strstart(p, "id=", &p)) {
870 if ((ret = add_adaptation_set(s, &as, AVMEDIA_TYPE_UNKNOWN)) < 0)
874 snprintf(as->id, sizeof(as->id), "%.*s", n, p);
880 } else if (state == parse_id && av_strstart(p, "descriptor=", &p)) {
881 n = strcspn(p, ">") + 1; //followed by one comma, so plus 1
883 as->descriptor = av_strndup(p, n);
885 av_log(s, AV_LOG_ERROR, "Parse error, descriptor string should be a self-closing xml tag\n");
886 return AVERROR(EINVAL);
891 state = parse_descriptor;
892 } else if ((state == parse_id || state == parse_descriptor) && av_strstart(p, "streams=", &p)) { //descriptor is optional
893 state = parsing_streams;
894 } else if (state == parsing_streams) {
895 AdaptationSet *as = &c->as[c->nb_as - 1];
896 char idx_str[8], *end_str;
898 n = strcspn(p, " ,");
899 snprintf(idx_str, sizeof(idx_str), "%.*s", n, p);
902 // if value is "a" or "v", map all streams of that type
903 if (as->media_type == AVMEDIA_TYPE_UNKNOWN && (idx_str[0] == 'v' || idx_str[0] == 'a')) {
904 enum AVMediaType type = (idx_str[0] == 'v') ? AVMEDIA_TYPE_VIDEO : AVMEDIA_TYPE_AUDIO;
905 av_log(s, AV_LOG_DEBUG, "Map all streams of type %s\n", idx_str);
907 for (i = 0; i < s->nb_streams; i++) {
908 if (s->streams[i]->codecpar->codec_type != type)
911 as->media_type = s->streams[i]->codecpar->codec_type;
913 if ((ret = adaptation_set_add_stream(s, c->nb_as, i)) < 0)
916 } else { // select single stream
917 i = strtol(idx_str, &end_str, 10);
918 if (idx_str == end_str || i < 0 || i >= s->nb_streams) {
919 av_log(s, AV_LOG_ERROR, "Selected stream \"%s\" not found!\n", idx_str);
920 return AVERROR(EINVAL);
922 av_log(s, AV_LOG_DEBUG, "Map stream %d\n", i);
924 if (as->media_type == AVMEDIA_TYPE_UNKNOWN) {
925 as->media_type = s->streams[i]->codecpar->codec_type;
928 if ((ret = adaptation_set_add_stream(s, c->nb_as, i)) < 0)
937 return AVERROR(EINVAL);
942 // check for unassigned streams
943 for (i = 0; i < s->nb_streams; i++) {
944 OutputStream *os = &c->streams[i];
946 av_log(s, AV_LOG_ERROR, "Stream %d is not mapped to an AdaptationSet\n", i);
947 return AVERROR(EINVAL);
953 static int write_manifest(AVFormatContext *s, int final)
955 DASHContext *c = s->priv_data;
957 char temp_filename[1024];
959 const char *proto = avio_find_protocol_name(s->url);
960 int use_rename = proto && !strcmp(proto, "file");
961 static unsigned int warned_non_file = 0;
962 AVDictionaryEntry *title = av_dict_get(s->metadata, "title", NULL, 0);
963 AVDictionary *opts = NULL;
965 if (!use_rename && !warned_non_file++)
966 av_log(s, AV_LOG_ERROR, "Cannot use rename on non file protocol, this may lead to races and temporary partial files\n");
968 snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", s->url);
969 set_http_options(&opts, c);
970 ret = dashenc_io_open(s, &c->mpd_out, temp_filename, &opts);
973 return handle_io_open_error(s, ret, temp_filename);
976 avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
977 avio_printf(out, "<MPD xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
978 "\txmlns=\"urn:mpeg:dash:schema:mpd:2011\"\n"
979 "\txmlns:xlink=\"http://www.w3.org/1999/xlink\"\n"
980 "\txsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\"\n"
981 "\tprofiles=\"urn:mpeg:dash:profile:isoff-live:2011\"\n"
982 "\ttype=\"%s\"\n", final ? "static" : "dynamic");
984 avio_printf(out, "\tmediaPresentationDuration=\"");
985 write_time(out, c->total_duration);
986 avio_printf(out, "\"\n");
988 int64_t update_period = c->last_duration / AV_TIME_BASE;
990 if (c->use_template && !c->use_timeline)
992 avio_printf(out, "\tminimumUpdatePeriod=\"PT%"PRId64"S\"\n", update_period);
993 avio_printf(out, "\tsuggestedPresentationDelay=\"PT%"PRId64"S\"\n", c->last_duration / AV_TIME_BASE);
994 if (c->availability_start_time[0])
995 avio_printf(out, "\tavailabilityStartTime=\"%s\"\n", c->availability_start_time);
996 format_date_now(now_str, sizeof(now_str));
998 avio_printf(out, "\tpublishTime=\"%s\"\n", now_str);
999 if (c->window_size && c->use_template) {
1000 avio_printf(out, "\ttimeShiftBufferDepth=\"");
1001 write_time(out, c->last_duration * c->window_size);
1002 avio_printf(out, "\"\n");
1005 avio_printf(out, "\tminBufferTime=\"");
1006 write_time(out, c->last_duration * 2);
1007 avio_printf(out, "\">\n");
1008 avio_printf(out, "\t<ProgramInformation>\n");
1010 char *escaped = xmlescape(title->value);
1011 avio_printf(out, "\t\t<Title>%s</Title>\n", escaped);
1014 avio_printf(out, "\t</ProgramInformation>\n");
1016 if (c->window_size && s->nb_streams > 0 && c->streams[0].nb_segments > 0 && !c->use_template) {
1017 OutputStream *os = &c->streams[0];
1018 int start_index = FFMAX(os->nb_segments - c->window_size, 0);
1019 int64_t start_time = av_rescale_q(os->segments[start_index]->time, s->streams[0]->time_base, AV_TIME_BASE_Q);
1020 avio_printf(out, "\t<Period id=\"0\" start=\"");
1021 write_time(out, start_time);
1022 avio_printf(out, "\">\n");
1024 avio_printf(out, "\t<Period id=\"0\" start=\"PT0.0S\">\n");
1027 for (i = 0; i < c->nb_as; i++) {
1028 if ((ret = write_adaptation_set(s, out, i, final)) < 0)
1031 avio_printf(out, "\t</Period>\n");
1033 if (c->utc_timing_url)
1034 avio_printf(out, "\t<UTCTiming schemeIdUri=\"urn:mpeg:dash:utc:http-xsdate:2014\" value=\"%s\"/>\n", c->utc_timing_url);
1036 avio_printf(out, "</MPD>\n");
1038 dashenc_io_close(s, &c->mpd_out, temp_filename);
1041 if ((ret = avpriv_io_move(temp_filename, s->url)) < 0)
1045 if (c->hls_playlist) {
1046 char filename_hls[1024];
1047 const char *audio_group = "A1";
1048 char audio_codec_str[128] = "\0";
1050 int max_audio_bitrate = 0;
1052 // Publish master playlist only the configured rate
1053 if (c->master_playlist_created && (!c->master_publish_rate ||
1054 c->streams[0].segment_index % c->master_publish_rate))
1058 snprintf(filename_hls, sizeof(filename_hls), "%smaster.m3u8", c->dirname);
1060 snprintf(filename_hls, sizeof(filename_hls), "master.m3u8");
1062 snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", filename_hls);
1064 set_http_options(&opts, c);
1065 ret = dashenc_io_open(s, &c->m3u8_out, temp_filename, &opts);
1066 av_dict_free(&opts);
1068 return handle_io_open_error(s, ret, temp_filename);
1071 ff_hls_write_playlist_version(c->m3u8_out, 7);
1073 for (i = 0; i < s->nb_streams; i++) {
1074 char playlist_file[64];
1075 AVStream *st = s->streams[i];
1076 OutputStream *os = &c->streams[i];
1077 if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
1079 if (os->segment_type != SEGMENT_TYPE_MP4)
1081 get_hls_playlist_name(playlist_file, sizeof(playlist_file), NULL, i);
1082 ff_hls_write_audio_rendition(c->m3u8_out, (char *)audio_group,
1083 playlist_file, NULL, i, is_default);
1084 max_audio_bitrate = FFMAX(st->codecpar->bit_rate +
1085 os->muxer_overhead, max_audio_bitrate);
1086 if (!av_strnstr(audio_codec_str, os->codec_str, sizeof(audio_codec_str))) {
1087 if (strlen(audio_codec_str))
1088 av_strlcat(audio_codec_str, ",", sizeof(audio_codec_str));
1089 av_strlcat(audio_codec_str, os->codec_str, sizeof(audio_codec_str));
1094 for (i = 0; i < s->nb_streams; i++) {
1095 char playlist_file[64];
1096 char codec_str[128];
1097 AVStream *st = s->streams[i];
1098 OutputStream *os = &c->streams[i];
1099 char *agroup = NULL;
1100 char *codec_str_ptr = NULL;
1101 int stream_bitrate = st->codecpar->bit_rate + os->muxer_overhead;
1102 if (st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
1104 if (os->segment_type != SEGMENT_TYPE_MP4)
1106 av_strlcpy(codec_str, os->codec_str, sizeof(codec_str));
1107 if (max_audio_bitrate) {
1108 agroup = (char *)audio_group;
1109 stream_bitrate += max_audio_bitrate;
1110 av_strlcat(codec_str, ",", sizeof(codec_str));
1111 av_strlcat(codec_str, audio_codec_str, sizeof(codec_str));
1113 if (st->codecpar->codec_id != AV_CODEC_ID_HEVC) {
1114 codec_str_ptr = codec_str;
1116 get_hls_playlist_name(playlist_file, sizeof(playlist_file), NULL, i);
1117 ff_hls_write_stream_info(st, c->m3u8_out, stream_bitrate,
1118 playlist_file, agroup,
1119 codec_str_ptr, NULL);
1121 dashenc_io_close(s, &c->m3u8_out, temp_filename);
1123 if ((ret = avpriv_io_move(temp_filename, filename_hls)) < 0)
1125 c->master_playlist_created = 1;
1131 static int dict_copy_entry(AVDictionary **dst, const AVDictionary *src, const char *key)
1133 AVDictionaryEntry *entry = av_dict_get(src, key, NULL, 0);
1135 av_dict_set(dst, key, entry->value, AV_DICT_DONT_OVERWRITE);
1139 static int dash_init(AVFormatContext *s)
1141 DASHContext *c = s->priv_data;
1144 char basename[1024];
1146 c->nr_of_streams_to_flush = 0;
1147 if (c->single_file_name)
1150 c->use_template = 0;
1152 #if FF_API_DASH_MIN_SEG_DURATION
1153 if (c->min_seg_duration != 5000000) {
1154 av_log(s, AV_LOG_WARNING, "The min_seg_duration option is deprecated and will be removed. Please use the -seg_duration\n");
1155 c->seg_duration = c->min_seg_duration;
1158 if (c->lhls && s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
1159 av_log(s, AV_LOG_ERROR,
1160 "LHLS is experimental, Please set -strict experimental in order to enable it.\n");
1161 return AVERROR_EXPERIMENTAL;
1164 if (c->lhls && !c->streaming) {
1165 av_log(s, AV_LOG_WARNING, "LHLS option will be ignored as streaming is not enabled\n");
1169 if (c->lhls && !c->hls_playlist) {
1170 av_log(s, AV_LOG_WARNING, "LHLS option will be ignored as hls_playlist is not enabled\n");
1174 if (c->global_sidx && !c->single_file) {
1175 av_log(s, AV_LOG_WARNING, "Global SIDX option will be ignored as single_file is not enabled\n");
1179 if (c->global_sidx && c->streaming) {
1180 av_log(s, AV_LOG_WARNING, "Global SIDX option will be ignored as streaming is enabled\n");
1184 av_strlcpy(c->dirname, s->url, sizeof(c->dirname));
1185 ptr = strrchr(c->dirname, '/');
1187 av_strlcpy(basename, &ptr[1], sizeof(basename));
1190 c->dirname[0] = '\0';
1191 av_strlcpy(basename, s->url, sizeof(basename));
1194 ptr = strrchr(basename, '.');
1198 c->streams = av_mallocz(sizeof(*c->streams) * s->nb_streams);
1200 return AVERROR(ENOMEM);
1202 if ((ret = parse_adaptation_sets(s)) < 0)
1205 if ((ret = init_segment_types(s)) < 0)
1208 for (i = 0; i < s->nb_streams; i++) {
1209 OutputStream *os = &c->streams[i];
1210 AdaptationSet *as = &c->as[os->as_idx - 1];
1211 AVFormatContext *ctx;
1213 AVDictionary *opts = NULL;
1214 char filename[1024];
1216 os->bit_rate = s->streams[i]->codecpar->bit_rate;
1217 if (!os->bit_rate) {
1218 int level = s->strict_std_compliance >= FF_COMPLIANCE_STRICT ?
1219 AV_LOG_ERROR : AV_LOG_WARNING;
1220 av_log(s, level, "No bit rate set for stream %d\n", i);
1221 if (s->strict_std_compliance >= FF_COMPLIANCE_STRICT)
1222 return AVERROR(EINVAL);
1225 // copy AdaptationSet language and role from stream metadata
1226 dict_copy_entry(&as->metadata, s->streams[i]->metadata, "language");
1227 dict_copy_entry(&as->metadata, s->streams[i]->metadata, "role");
1229 ctx = avformat_alloc_context();
1231 return AVERROR(ENOMEM);
1233 if (c->init_seg_name) {
1234 os->init_seg_name = av_strireplace(c->init_seg_name, "$ext$", os->extension_name);
1235 if (!os->init_seg_name)
1236 return AVERROR(ENOMEM);
1238 if (c->media_seg_name) {
1239 os->media_seg_name = av_strireplace(c->media_seg_name, "$ext$", os->extension_name);
1240 if (!os->media_seg_name)
1241 return AVERROR(ENOMEM);
1243 if (c->single_file_name) {
1244 os->single_file_name = av_strireplace(c->single_file_name, "$ext$", os->extension_name);
1245 if (!os->single_file_name)
1246 return AVERROR(ENOMEM);
1249 if (os->segment_type == SEGMENT_TYPE_WEBM) {
1250 if ((!c->single_file && check_file_extension(os->init_seg_name, os->format_name) != 0) ||
1251 (!c->single_file && check_file_extension(os->media_seg_name, os->format_name) != 0) ||
1252 (c->single_file && check_file_extension(os->single_file_name, os->format_name) != 0)) {
1253 av_log(s, AV_LOG_WARNING,
1254 "One or many segment file names doesn't end with .webm. "
1255 "Override -init_seg_name and/or -media_seg_name and/or "
1256 "-single_file_name to end with the extension .webm\n");
1259 // Streaming not supported as matroskaenc buffers internally before writing the output
1260 av_log(s, AV_LOG_WARNING, "One or more streams in WebM output format. Streaming option will be ignored\n");
1265 ctx->oformat = av_guess_format(os->format_name, NULL, NULL);
1267 return AVERROR_MUXER_NOT_FOUND;
1269 ctx->interrupt_callback = s->interrupt_callback;
1270 ctx->opaque = s->opaque;
1271 ctx->io_close = s->io_close;
1272 ctx->io_open = s->io_open;
1273 ctx->strict_std_compliance = s->strict_std_compliance;
1275 if (!(st = avformat_new_stream(ctx, NULL)))
1276 return AVERROR(ENOMEM);
1277 avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
1278 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
1279 st->time_base = s->streams[i]->time_base;
1280 st->avg_frame_rate = s->streams[i]->avg_frame_rate;
1281 ctx->avoid_negative_ts = s->avoid_negative_ts;
1282 ctx->flags = s->flags;
1284 if (c->single_file) {
1285 if (os->single_file_name)
1286 ff_dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), os->single_file_name, i, 0, os->bit_rate, 0);
1288 snprintf(os->initfile, sizeof(os->initfile), "%s-stream%d.%s", basename, i, os->format_name);
1290 ff_dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), os->init_seg_name, i, 0, os->bit_rate, 0);
1292 snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);
1293 set_http_options(&opts, c);
1294 if (!c->single_file) {
1295 if ((ret = avio_open_dyn_buf(&ctx->pb)) < 0)
1297 ret = s->io_open(s, &os->out, filename, AVIO_FLAG_WRITE, &opts);
1299 ctx->url = av_strdup(filename);
1300 ret = avio_open2(&ctx->pb, filename, AVIO_FLAG_WRITE, NULL, &opts);
1302 av_dict_free(&opts);
1305 os->init_start_pos = 0;
1307 if (c->format_options_str) {
1308 ret = av_dict_parse_string(&opts, c->format_options_str, "=", ":", 0);
1313 if (os->segment_type == SEGMENT_TYPE_MP4) {
1315 // frag_every_frame : Allows lower latency streaming
1316 // skip_sidx : Reduce bitrate overhead
1317 // skip_trailer : Avoids growing memory usage with time
1318 av_dict_set(&opts, "movflags", "frag_every_frame+dash+delay_moov+skip_sidx+skip_trailer", 0);
1321 av_dict_set(&opts, "movflags", "frag_custom+dash+delay_moov+global_sidx+skip_trailer", 0);
1323 av_dict_set(&opts, "movflags", "frag_custom+dash+delay_moov+skip_trailer", 0);
1326 av_dict_set_int(&opts, "cluster_time_limit", c->seg_duration / 1000, 0);
1327 av_dict_set_int(&opts, "cluster_size_limit", 5 * 1024 * 1024, 0); // set a large cluster size limit
1328 av_dict_set_int(&opts, "dash", 1, 0);
1329 av_dict_set_int(&opts, "dash_track_number", i + 1, 0);
1330 av_dict_set_int(&opts, "live", 1, 0);
1332 ret = avformat_init_output(ctx, &opts);
1333 av_dict_free(&opts);
1337 avio_flush(ctx->pb);
1339 av_log(s, AV_LOG_VERBOSE, "Representation %d init segment will be written to: %s\n", i, filename);
1341 s->streams[i]->time_base = st->time_base;
1342 // If the muxer wants to shift timestamps, request to have them shifted
1343 // already before being handed to this muxer, so we don't have mismatches
1344 // between the MPD and the actual segments.
1345 s->avoid_negative_ts = ctx->avoid_negative_ts;
1346 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
1347 AVRational avg_frame_rate = s->streams[i]->avg_frame_rate;
1348 if (avg_frame_rate.num > 0) {
1349 if (av_cmp_q(avg_frame_rate, as->min_frame_rate) < 0)
1350 as->min_frame_rate = avg_frame_rate;
1351 if (av_cmp_q(as->max_frame_rate, avg_frame_rate) < 0)
1352 as->max_frame_rate = avg_frame_rate;
1354 as->ambiguous_frame_rate = 1;
1359 set_codec_str(s, st->codecpar, &st->avg_frame_rate, os->codec_str,
1360 sizeof(os->codec_str));
1361 os->first_pts = AV_NOPTS_VALUE;
1362 os->max_pts = AV_NOPTS_VALUE;
1363 os->last_dts = AV_NOPTS_VALUE;
1364 os->segment_index = 1;
1366 if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
1367 c->nr_of_streams_to_flush++;
1370 if (!c->has_video && c->seg_duration <= 0) {
1371 av_log(s, AV_LOG_WARNING, "no video stream and no seg duration set\n");
1372 return AVERROR(EINVAL);
1375 c->nr_of_streams_flushed = 0;
1380 static int dash_write_header(AVFormatContext *s)
1382 DASHContext *c = s->priv_data;
1384 for (i = 0; i < s->nb_streams; i++) {
1385 OutputStream *os = &c->streams[i];
1386 if ((ret = avformat_write_header(os->ctx, NULL)) < 0)
1389 // Flush init segment
1390 // Only for WebM segment, since for mp4 delay_moov is set and
1391 // the init segment is thus flushed after the first packets.
1392 if (os->segment_type == SEGMENT_TYPE_WEBM &&
1393 (ret = flush_init_segment(s, os)) < 0)
1399 static int add_segment(OutputStream *os, const char *file,
1400 int64_t time, int64_t duration,
1401 int64_t start_pos, int64_t range_length,
1402 int64_t index_length, int next_exp_index)
1406 if (os->nb_segments >= os->segments_size) {
1407 os->segments_size = (os->segments_size + 1) * 2;
1408 if ((err = av_reallocp(&os->segments, sizeof(*os->segments) *
1409 os->segments_size)) < 0) {
1410 os->segments_size = 0;
1411 os->nb_segments = 0;
1415 seg = av_mallocz(sizeof(*seg));
1417 return AVERROR(ENOMEM);
1418 av_strlcpy(seg->file, file, sizeof(seg->file));
1420 seg->duration = duration;
1421 if (seg->time < 0) { // If pts<0, it is expected to be cut away with an edit list
1422 seg->duration += seg->time;
1425 seg->start_pos = start_pos;
1426 seg->range_length = range_length;
1427 seg->index_length = index_length;
1428 os->segments[os->nb_segments++] = seg;
1429 os->segment_index++;
1430 //correcting the segment index if it has fallen behind the expected value
1431 if (os->segment_index < next_exp_index) {
1432 av_log(NULL, AV_LOG_WARNING, "Correcting the segment index after file %s: current=%d corrected=%d\n",
1433 file, os->segment_index, next_exp_index);
1434 os->segment_index = next_exp_index;
1439 static void write_styp(AVIOContext *pb)
1442 ffio_wfourcc(pb, "styp");
1443 ffio_wfourcc(pb, "msdh");
1444 avio_wb32(pb, 0); /* minor */
1445 ffio_wfourcc(pb, "msdh");
1446 ffio_wfourcc(pb, "msix");
1449 static void find_index_range(AVFormatContext *s, const char *full_path,
1450 int64_t pos, int *index_length)
1456 ret = s->io_open(s, &pb, full_path, AVIO_FLAG_READ, NULL);
1459 if (avio_seek(pb, pos, SEEK_SET) != pos) {
1460 ff_format_io_close(s, &pb);
1463 ret = avio_read(pb, buf, 8);
1464 ff_format_io_close(s, &pb);
1467 if (AV_RL32(&buf[4]) != MKTAG('s', 'i', 'd', 'x'))
1469 *index_length = AV_RB32(&buf[0]);
1472 static int update_stream_extradata(AVFormatContext *s, OutputStream *os,
1473 AVPacket *pkt, AVRational *frame_rate)
1475 AVCodecParameters *par = os->ctx->streams[0]->codecpar;
1477 int ret, extradata_size;
1479 if (par->extradata_size)
1482 extradata = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, &extradata_size);
1483 if (!extradata_size)
1486 ret = ff_alloc_extradata(par, extradata_size);
1490 memcpy(par->extradata, extradata, extradata_size);
1492 set_codec_str(s, par, frame_rate, os->codec_str, sizeof(os->codec_str));
1497 static void dashenc_delete_file(AVFormatContext *s, char *filename) {
1498 DASHContext *c = s->priv_data;
1499 int http_base_proto = ff_is_http_proto(filename);
1501 if (http_base_proto) {
1502 AVIOContext *out = NULL;
1503 AVDictionary *http_opts = NULL;
1505 set_http_options(&http_opts, c);
1506 av_dict_set(&http_opts, "method", "DELETE", 0);
1508 if (dashenc_io_open(s, &out, filename, &http_opts) < 0) {
1509 av_log(s, AV_LOG_ERROR, "failed to delete %s\n", filename);
1512 av_dict_free(&http_opts);
1513 ff_format_io_close(s, &out);
1515 int res = avpriv_io_delete(filename);
1517 char errbuf[AV_ERROR_MAX_STRING_SIZE];
1518 av_strerror(res, errbuf, sizeof(errbuf));
1519 av_log(s, (res == AVERROR(ENOENT) ? AV_LOG_WARNING : AV_LOG_ERROR), "failed to delete %s: %s\n", filename, errbuf);
1524 static int dashenc_delete_segment_file(AVFormatContext *s, const char* file)
1526 DASHContext *c = s->priv_data;
1527 size_t dirname_len, file_len;
1528 char filename[1024];
1530 dirname_len = strlen(c->dirname);
1531 if (dirname_len >= sizeof(filename)) {
1532 av_log(s, AV_LOG_WARNING, "Cannot delete segments as the directory path is too long: %"PRIu64" characters: %s\n",
1533 (uint64_t)dirname_len, c->dirname);
1534 return AVERROR(ENAMETOOLONG);
1537 memcpy(filename, c->dirname, dirname_len);
1539 file_len = strlen(file);
1540 if ((dirname_len + file_len) >= sizeof(filename)) {
1541 av_log(s, AV_LOG_WARNING, "Cannot delete segments as the path is too long: %"PRIu64" characters: %s%s\n",
1542 (uint64_t)(dirname_len + file_len), c->dirname, file);
1543 return AVERROR(ENAMETOOLONG);
1546 memcpy(filename + dirname_len, file, file_len + 1); // include the terminating zero
1547 dashenc_delete_file(s, filename);
1552 static inline void dashenc_delete_media_segments(AVFormatContext *s, OutputStream *os, int remove_count)
1554 for (int i = 0; i < remove_count; ++i) {
1555 dashenc_delete_segment_file(s, os->segments[i]->file);
1557 // Delete the segment regardless of whether the file was successfully deleted
1558 av_free(os->segments[i]);
1561 os->nb_segments -= remove_count;
1562 memmove(os->segments, os->segments + remove_count, os->nb_segments * sizeof(*os->segments));
1565 static int dash_flush(AVFormatContext *s, int final, int stream)
1567 DASHContext *c = s->priv_data;
1570 const char *proto = avio_find_protocol_name(s->url);
1571 int use_rename = proto && !strcmp(proto, "file");
1573 int cur_flush_segment_index = 0, next_exp_index = -1;
1575 cur_flush_segment_index = c->streams[stream].segment_index;
1577 //finding the next segment's expected index, based on the current pts value
1578 if (c->use_template && !c->use_timeline && c->index_correction &&
1579 c->streams[stream].last_pts != AV_NOPTS_VALUE &&
1580 c->streams[stream].first_pts != AV_NOPTS_VALUE) {
1581 int64_t pts_diff = av_rescale_q(c->streams[stream].last_pts -
1582 c->streams[stream].first_pts,
1583 s->streams[stream]->time_base,
1585 next_exp_index = (pts_diff / c->seg_duration) + 1;
1589 for (i = 0; i < s->nb_streams; i++) {
1590 OutputStream *os = &c->streams[i];
1591 AVStream *st = s->streams[i];
1592 int range_length, index_length = 0;
1594 if (!os->packets_written)
1597 // Flush the single stream that got a keyframe right now.
1598 // Flush all audio streams as well, in sync with video keyframes,
1599 // but not the other video streams.
1600 if (stream >= 0 && i != stream) {
1601 if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
1603 // Make sure we don't flush audio streams multiple times, when
1604 // all video streams are flushed one at a time.
1605 if (c->has_video && os->segment_index > cur_flush_segment_index)
1609 if (!c->single_file) {
1610 if (os->segment_type == SEGMENT_TYPE_MP4 && !os->written_len)
1611 write_styp(os->ctx->pb);
1613 snprintf(os->full_path, sizeof(os->full_path), "%s%s", c->dirname, os->initfile);
1616 ret = flush_dynbuf(c, os, &range_length);
1619 os->packets_written = 0;
1621 if (c->single_file) {
1622 find_index_range(s, os->full_path, os->pos, &index_length);
1624 dashenc_io_close(s, &os->out, os->temp_path);
1627 ret = avpriv_io_move(os->temp_path, os->full_path);
1633 if (!os->muxer_overhead)
1634 os->muxer_overhead = ((int64_t) (range_length - os->total_pkt_size) *
1636 av_rescale_q(os->max_pts - os->start_pts,
1637 st->time_base, AV_TIME_BASE_Q);
1638 os->total_pkt_size = 0;
1640 if (!os->bit_rate) {
1641 // calculate average bitrate of first segment
1642 int64_t bitrate = (int64_t) range_length * 8 * AV_TIME_BASE / av_rescale_q(os->max_pts - os->start_pts,
1646 os->bit_rate = bitrate;
1648 add_segment(os, os->filename, os->start_pts, os->max_pts - os->start_pts, os->pos, range_length, index_length, next_exp_index);
1649 av_log(s, AV_LOG_VERBOSE, "Representation %d media segment %d written to: %s\n", i, os->segment_index, os->full_path);
1651 os->pos += range_length;
1654 if (c->window_size) {
1655 for (i = 0; i < s->nb_streams; i++) {
1656 OutputStream *os = &c->streams[i];
1657 int remove_count = os->nb_segments - c->window_size - c->extra_window_size;
1658 if (remove_count > 0)
1659 dashenc_delete_media_segments(s, os, remove_count);
1664 for (i = 0; i < s->nb_streams; i++) {
1665 OutputStream *os = &c->streams[i];
1666 if (os->ctx && os->ctx_inited) {
1667 int64_t file_size = avio_tell(os->ctx->pb);
1668 av_write_trailer(os->ctx);
1669 if (c->global_sidx) {
1670 int j, start_index, start_number;
1671 int64_t sidx_size = avio_tell(os->ctx->pb) - file_size;
1672 get_start_index_number(os, c, &start_index, &start_number);
1673 if (start_index >= os->nb_segments ||
1674 os->segment_type != SEGMENT_TYPE_MP4)
1676 os->init_range_length += sidx_size;
1677 for (j = start_index; j < os->nb_segments; j++) {
1678 Segment *seg = os->segments[j];
1679 seg->start_pos += sidx_size;
1687 if (c->has_video && !final) {
1688 c->nr_of_streams_flushed++;
1689 if (c->nr_of_streams_flushed != c->nr_of_streams_to_flush)
1692 c->nr_of_streams_flushed = 0;
1694 ret = write_manifest(s, final);
1699 static int dash_write_packet(AVFormatContext *s, AVPacket *pkt)
1701 DASHContext *c = s->priv_data;
1702 AVStream *st = s->streams[pkt->stream_index];
1703 OutputStream *os = &c->streams[pkt->stream_index];
1704 int64_t seg_end_duration, elapsed_duration;
1707 ret = update_stream_extradata(s, os, pkt, &st->avg_frame_rate);
1711 // Fill in a heuristic guess of the packet duration, if none is available.
1712 // The mp4 muxer will do something similar (for the last packet in a fragment)
1713 // if nothing is set (setting it for the other packets doesn't hurt).
1714 // By setting a nonzero duration here, we can be sure that the mp4 muxer won't
1715 // invoke its heuristic (this doesn't have to be identical to that algorithm),
1716 // so that we know the exact timestamps of fragments.
1717 if (!pkt->duration && os->last_dts != AV_NOPTS_VALUE)
1718 pkt->duration = pkt->dts - os->last_dts;
1719 os->last_dts = pkt->dts;
1721 // If forcing the stream to start at 0, the mp4 muxer will set the start
1722 // timestamps to 0. Do the same here, to avoid mismatches in duration/timestamps.
1723 if (os->first_pts == AV_NOPTS_VALUE &&
1724 s->avoid_negative_ts == AVFMT_AVOID_NEG_TS_MAKE_ZERO) {
1725 pkt->pts -= pkt->dts;
1729 if (os->first_pts == AV_NOPTS_VALUE)
1730 os->first_pts = pkt->pts;
1731 os->last_pts = pkt->pts;
1733 if (!c->availability_start_time[0]) {
1734 int64_t start_time_us = av_gettime();
1735 c->start_time_s = start_time_us / 1000000;
1736 format_date_now(c->availability_start_time,
1737 sizeof(c->availability_start_time));
1740 if (!os->availability_time_offset && pkt->duration) {
1741 int64_t frame_duration = av_rescale_q(pkt->duration, st->time_base,
1743 os->availability_time_offset = ((double) c->seg_duration -
1744 frame_duration) / AV_TIME_BASE;
1747 if (c->use_template && !c->use_timeline) {
1748 elapsed_duration = pkt->pts - os->first_pts;
1749 seg_end_duration = (int64_t) os->segment_index * c->seg_duration;
1751 elapsed_duration = pkt->pts - os->start_pts;
1752 seg_end_duration = c->seg_duration;
1755 if ((!c->has_video || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) &&
1756 pkt->flags & AV_PKT_FLAG_KEY && os->packets_written &&
1757 av_compare_ts(elapsed_duration, st->time_base,
1758 seg_end_duration, AV_TIME_BASE_Q) >= 0) {
1759 int64_t prev_duration = c->last_duration;
1761 c->last_duration = av_rescale_q(pkt->pts - os->start_pts,
1764 c->total_duration = av_rescale_q(pkt->pts - os->first_pts,
1768 if ((!c->use_timeline || !c->use_template) && prev_duration) {
1769 if (c->last_duration < prev_duration*9/10 ||
1770 c->last_duration > prev_duration*11/10) {
1771 av_log(s, AV_LOG_WARNING,
1772 "Segment durations differ too much, enable use_timeline "
1773 "and use_template, or keep a stricter keyframe interval\n");
1777 if ((ret = dash_flush(s, 0, pkt->stream_index)) < 0)
1781 if (!os->packets_written) {
1782 // If we wrote a previous segment, adjust the start time of the segment
1783 // to the end of the previous one (which is the same as the mp4 muxer
1784 // does). This avoids gaps in the timeline.
1785 if (os->max_pts != AV_NOPTS_VALUE)
1786 os->start_pts = os->max_pts;
1788 os->start_pts = pkt->pts;
1790 if (os->max_pts == AV_NOPTS_VALUE)
1791 os->max_pts = pkt->pts + pkt->duration;
1793 os->max_pts = FFMAX(os->max_pts, pkt->pts + pkt->duration);
1794 os->packets_written++;
1795 os->total_pkt_size += pkt->size;
1796 if ((ret = ff_write_chained(os->ctx, 0, pkt, s, 0)) < 0)
1799 if (!os->init_range_length)
1800 flush_init_segment(s, os);
1802 //open the output context when the first frame of a segment is ready
1803 if (!c->single_file && os->packets_written == 1) {
1804 AVDictionary *opts = NULL;
1805 const char *proto = avio_find_protocol_name(s->url);
1806 int use_rename = proto && !strcmp(proto, "file");
1807 os->filename[0] = os->full_path[0] = os->temp_path[0] = '\0';
1808 ff_dash_fill_tmpl_params(os->filename, sizeof(os->filename),
1809 os->media_seg_name, pkt->stream_index,
1810 os->segment_index, os->bit_rate, os->start_pts);
1811 snprintf(os->full_path, sizeof(os->full_path), "%s%s", c->dirname,
1813 snprintf(os->temp_path, sizeof(os->temp_path),
1814 use_rename ? "%s.tmp" : "%s", os->full_path);
1815 set_http_options(&opts, c);
1816 ret = dashenc_io_open(s, &os->out, os->temp_path, &opts);
1817 av_dict_free(&opts);
1819 return handle_io_open_error(s, ret, os->temp_path);
1822 char *prefetch_url = use_rename ? NULL : os->filename;
1823 write_hls_media_playlist(os, s, pkt->stream_index, 0, prefetch_url);
1827 //write out the data immediately in streaming mode
1828 if (c->streaming && os->segment_type == SEGMENT_TYPE_MP4) {
1830 uint8_t *buf = NULL;
1831 if (!os->written_len)
1832 write_styp(os->ctx->pb);
1833 avio_flush(os->ctx->pb);
1834 len = avio_get_dyn_buf (os->ctx->pb, &buf);
1836 avio_write(os->out, buf + os->written_len, len - os->written_len);
1837 avio_flush(os->out);
1839 os->written_len = len;
1845 static int dash_write_trailer(AVFormatContext *s)
1847 DASHContext *c = s->priv_data;
1850 if (s->nb_streams > 0) {
1851 OutputStream *os = &c->streams[0];
1852 // If no segments have been written so far, try to do a crude
1853 // guess of the segment duration
1854 if (!c->last_duration)
1855 c->last_duration = av_rescale_q(os->max_pts - os->start_pts,
1856 s->streams[0]->time_base,
1858 c->total_duration = av_rescale_q(os->max_pts - os->first_pts,
1859 s->streams[0]->time_base,
1862 dash_flush(s, 1, -1);
1864 if (c->remove_at_exit) {
1865 for (i = 0; i < s->nb_streams; ++i) {
1866 OutputStream *os = &c->streams[i];
1867 dashenc_delete_media_segments(s, os, os->nb_segments);
1868 dashenc_delete_segment_file(s, os->initfile);
1869 if (c->hls_playlist && os->segment_type == SEGMENT_TYPE_MP4) {
1870 char filename[1024];
1871 get_hls_playlist_name(filename, sizeof(filename), c->dirname, i);
1872 dashenc_delete_file(s, filename);
1875 dashenc_delete_file(s, s->url);
1877 if (c->hls_playlist && c->master_playlist_created) {
1878 char filename[1024];
1879 snprintf(filename, sizeof(filename), "%smaster.m3u8", c->dirname);
1880 dashenc_delete_file(s, filename);
1887 static int dash_check_bitstream(struct AVFormatContext *s, const AVPacket *avpkt)
1889 DASHContext *c = s->priv_data;
1890 OutputStream *os = &c->streams[avpkt->stream_index];
1891 AVFormatContext *oc = os->ctx;
1892 if (oc->oformat->check_bitstream) {
1894 AVPacket pkt = *avpkt;
1895 pkt.stream_index = 0;
1896 ret = oc->oformat->check_bitstream(oc, &pkt);
1898 AVStream *st = s->streams[avpkt->stream_index];
1899 AVStream *ost = oc->streams[0];
1900 st->internal->bsfcs = ost->internal->bsfcs;
1901 st->internal->nb_bsfcs = ost->internal->nb_bsfcs;
1902 ost->internal->bsfcs = NULL;
1903 ost->internal->nb_bsfcs = 0;
1910 #define OFFSET(x) offsetof(DASHContext, x)
1911 #define E AV_OPT_FLAG_ENCODING_PARAM
1912 static const AVOption options[] = {
1913 { "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 },
1914 { "window_size", "number of segments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },
1915 { "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 },
1916 #if FF_API_DASH_MIN_SEG_DURATION
1917 { "min_seg_duration", "minimum segment duration (in microseconds) (will be deprecated)", OFFSET(min_seg_duration), AV_OPT_TYPE_INT, { .i64 = 5000000 }, 0, INT_MAX, E },
1919 { "seg_duration", "segment duration (in seconds, fractional value can be set)", OFFSET(seg_duration), AV_OPT_TYPE_DURATION, { .i64 = 5000000 }, 0, INT_MAX, E },
1920 { "remove_at_exit", "remove all segments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
1921 { "use_template", "Use SegmentTemplate instead of SegmentList", OFFSET(use_template), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, E },
1922 { "use_timeline", "Use SegmentTimeline in SegmentTemplate", OFFSET(use_timeline), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, E },
1923 { "single_file", "Store all segments in one file, accessed using byte ranges", OFFSET(single_file), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
1924 { "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 },
1925 { "init_seg_name", "DASH-templated name to used for the initialization segment", OFFSET(init_seg_name), AV_OPT_TYPE_STRING, {.str = "init-stream$RepresentationID$.$ext$"}, 0, 0, E },
1926 { "media_seg_name", "DASH-templated name to used for the media segments", OFFSET(media_seg_name), AV_OPT_TYPE_STRING, {.str = "chunk-stream$RepresentationID$-$Number%05d$.$ext$"}, 0, 0, E },
1927 { "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 },
1928 { "method", "set the HTTP method", OFFSET(method), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1929 { "http_user_agent", "override User-Agent field in HTTP header", OFFSET(user_agent), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
1930 { "http_persistent", "Use persistent HTTP connections", OFFSET(http_persistent), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
1931 { "hls_playlist", "Generate HLS playlist files(master.m3u8, media_%d.m3u8)", OFFSET(hls_playlist), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
1932 { "streaming", "Enable/Disable streaming mode of output. Each frame will be moof fragment", OFFSET(streaming), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
1933 { "timeout", "set timeout for socket I/O operations", OFFSET(timeout), AV_OPT_TYPE_DURATION, { .i64 = -1 }, -1, INT_MAX, .flags = E },
1934 { "index_correction", "Enable/Disable segment index correction logic", OFFSET(index_correction), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
1935 { "format_options","set list of options for the container format (mp4/webm) used for dash", OFFSET(format_options_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
1936 { "global_sidx", "Write global SIDX atom. Applicable only for single file, mp4 output, non-streaming mode", OFFSET(global_sidx), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
1937 { "dash_segment_type", "set dash segment files type", OFFSET(segment_type_option), AV_OPT_TYPE_INT, {.i64 = SEGMENT_TYPE_AUTO }, 0, SEGMENT_TYPE_NB - 1, E, "segment_type"},
1938 { "auto", "select segment file format based on codec", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_TYPE_AUTO }, 0, UINT_MAX, E, "segment_type"},
1939 { "mp4", "make segment file in ISOBMFF format", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_TYPE_MP4 }, 0, UINT_MAX, E, "segment_type"},
1940 { "webm", "make segment file in WebM format", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_TYPE_WEBM }, 0, UINT_MAX, E, "segment_type"},
1941 { "ignore_io_errors", "Ignore IO errors during open and write. Useful for long-duration runs with network output", OFFSET(ignore_io_errors), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
1942 { "lhls", "Enable Low-latency HLS(Experimental). Adds #EXT-X-PREFETCH tag with current segment's URI", OFFSET(lhls), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
1943 { "master_m3u8_publish_rate", "Publish master playlist every after this many segment intervals", OFFSET(master_publish_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, UINT_MAX, E},
1947 static const AVClass dash_class = {
1948 .class_name = "dash muxer",
1949 .item_name = av_default_item_name,
1951 .version = LIBAVUTIL_VERSION_INT,
1954 AVOutputFormat ff_dash_muxer = {
1956 .long_name = NULL_IF_CONFIG_SMALL("DASH Muxer"),
1957 .extensions = "mpd",
1958 .priv_data_size = sizeof(DASHContext),
1959 .audio_codec = AV_CODEC_ID_AAC,
1960 .video_codec = AV_CODEC_ID_H264,
1961 .flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE | AVFMT_TS_NEGATIVE,
1963 .write_header = dash_write_header,
1964 .write_packet = dash_write_packet,
1965 .write_trailer = dash_write_trailer,
1966 .deinit = dash_free,
1967 .check_bitstream = dash_check_bitstream,
1968 .priv_class = &dash_class,