2 * Apple HTTP Live Streaming segmenter
3 * Copyright (c) 2012, Luca Barbato
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 #include "libavutil/avassert.h"
30 #include "libavutil/mathematics.h"
31 #include "libavutil/parseutils.h"
32 #include "libavutil/avstring.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/log.h"
35 #include "libavutil/time_internal.h"
38 #include "avio_internal.h"
40 #include "os_support.h"
43 #define LINE_BUFFER_SIZE 1024
45 typedef struct HLSSegment {
47 char sub_filename[1024];
48 double duration; /* in seconds */
53 char key_uri[LINE_BUFFER_SIZE + 1];
54 char iv_string[KEYSIZE*2 + 1];
56 struct HLSSegment *next;
59 typedef enum HLSFlags {
60 // Generate a single media file and use byte ranges in the playlist.
61 HLS_SINGLE_FILE = (1 << 0),
62 HLS_DELETE_SEGMENTS = (1 << 1),
63 HLS_ROUND_DURATIONS = (1 << 2),
64 HLS_DISCONT_START = (1 << 3),
65 HLS_OMIT_ENDLIST = (1 << 4),
66 HLS_SPLIT_BY_TIME = (1 << 5),
67 HLS_APPEND_LIST = (1 << 6),
68 HLS_PROGRAM_DATE_TIME = (1 << 7),
69 HLS_SECOND_LEVEL_SEGMENT_INDEX = (1 << 8), // include segment index in segment filenames when use_localtime e.g.: %%03d
70 HLS_SECOND_LEVEL_SEGMENT_DURATION = (1 << 9), // include segment duration (microsec) in segment filenames when use_localtime e.g.: %%09t
71 HLS_SECOND_LEVEL_SEGMENT_SIZE = (1 << 10), // include segment size (bytes) in segment filenames when use_localtime e.g.: %%014s
81 typedef struct HLSContext {
82 const AVClass *class; // Class for private options.
85 int64_t start_sequence;
86 AVOutputFormat *oformat;
87 AVOutputFormat *vtt_oformat;
90 AVFormatContext *vtt_avf;
92 float time; // Set by a private option.
93 float init_time; // Set by a private option.
94 int max_nb_segments; // Set by a private option.
95 int wrap; // Set by a private option.
96 uint32_t flags; // enum HLSFlags
97 uint32_t pl_type; // enum PlaylistType
98 char *segment_filename;
100 int use_localtime; ///< flag to expand filename with localtime
101 int use_localtime_mkdir;///< flag to mkdir dirname in timebased filename
103 int64_t recording_time;
108 double duration; // last segment duration computed so far, in seconds
109 int64_t start_pos; // last segment starting position
110 int64_t size; // last segment size
111 int64_t max_seg_size; // every segment file max size
113 int discontinuity_set;
116 HLSSegment *segments;
117 HLSSegment *last_segment;
118 HLSSegment *old_segments;
124 char *format_options_str;
125 char *vtt_format_options_str;
126 char *subtitle_filename;
127 AVDictionary *format_options;
130 char key_file[LINE_BUFFER_SIZE + 1];
131 char key_uri[LINE_BUFFER_SIZE + 1];
132 char key_string[KEYSIZE*2 + 1];
133 char iv_string[KEYSIZE*2 + 1];
134 AVDictionary *vtt_format_options;
138 double initial_prog_date_time;
139 char current_segment_final_filename_fmt[1024]; // when renaming segments
142 static int mkdir_p(const char *path) {
144 char *temp = av_strdup(path);
148 if (!path || !temp) {
152 if (!strncmp(temp, "/", 1) || !strncmp(temp, "\\", 1)) {
154 } else if (!strncmp(temp, "./", 2) || !strncmp(temp, ".\\", 2)) {
158 for ( ; *pos != '\0'; ++pos) {
159 if (*pos == '/' || *pos == '\\') {
162 ret = mkdir(temp, 0755);
167 if ((*(pos - 1) != '/') || (*(pos - 1) != '\\')) {
168 ret = mkdir(temp, 0755);
175 static int replace_int_data_in_filename(char *buf, int buf_size, const char *filename, char placeholder, int64_t number)
178 char *q, buf1[20], c;
179 int nd, len, addchar_count;
188 if (c == '%' && *(p+1) == '%') // %%
190 else if (c == '%' && (av_isdigit(*(p+1)) || *(p+1) == placeholder)) {
193 while (av_isdigit(*(p + addchar_count))) {
194 nd = nd * 10 + *(p + addchar_count) - '0';
198 if (*(p + addchar_count) == placeholder) {
199 len = snprintf(buf1, sizeof(buf1), "%0*"PRId64, (number < 0) ? nd : nd++, number);
200 if (len < 1) // returned error or empty buf1
202 if ((q - buf + len) > buf_size - 1)
204 memcpy(q, buf1, len);
206 p += (addchar_count + 1);
214 while (addchar_count--)
215 if ((q - buf) < buf_size - 1)
227 static int hls_delete_old_segments(HLSContext *hls) {
229 HLSSegment *segment, *previous_segment = NULL;
230 float playlist_duration = 0.0f;
231 int ret = 0, path_size, sub_path_size;
232 char *dirname = NULL, *p, *sub_path;
235 segment = hls->segments;
237 playlist_duration += segment->duration;
238 segment = segment->next;
241 segment = hls->old_segments;
243 playlist_duration -= segment->duration;
244 previous_segment = segment;
245 segment = previous_segment->next;
246 if (playlist_duration <= -previous_segment->duration) {
247 previous_segment->next = NULL;
252 if (segment && !hls->use_localtime_mkdir) {
253 if (hls->segment_filename) {
254 dirname = av_strdup(hls->segment_filename);
256 dirname = av_strdup(hls->avf->filename);
259 ret = AVERROR(ENOMEM);
262 p = (char *)av_basename(dirname);
267 av_log(hls, AV_LOG_DEBUG, "deleting old segment %s\n",
269 path_size = (hls->use_localtime_mkdir ? 0 : strlen(dirname)) + strlen(segment->filename) + 1;
270 path = av_malloc(path_size);
272 ret = AVERROR(ENOMEM);
276 if (hls->use_localtime_mkdir)
277 av_strlcpy(path, segment->filename, path_size);
278 else { // segment->filename contains basename only
279 av_strlcpy(path, dirname, path_size);
280 av_strlcat(path, segment->filename, path_size);
283 if (unlink(path) < 0) {
284 av_log(hls, AV_LOG_ERROR, "failed to delete old segment %s: %s\n",
285 path, strerror(errno));
288 if (segment->sub_filename[0] != '\0') {
289 sub_path_size = strlen(dirname) + strlen(segment->sub_filename) + 1;
290 sub_path = av_malloc(sub_path_size);
292 ret = AVERROR(ENOMEM);
296 av_strlcpy(sub_path, dirname, sub_path_size);
297 av_strlcat(sub_path, segment->sub_filename, sub_path_size);
298 if (unlink(sub_path) < 0) {
299 av_log(hls, AV_LOG_ERROR, "failed to delete old segment %s: %s\n",
300 sub_path, strerror(errno));
305 previous_segment = segment;
306 segment = previous_segment->next;
307 av_free(previous_segment);
317 static int hls_encryption_start(AVFormatContext *s)
319 HLSContext *hls = s->priv_data;
322 uint8_t key[KEYSIZE];
324 if ((ret = s->io_open(s, &pb, hls->key_info_file, AVIO_FLAG_READ, NULL)) < 0) {
325 av_log(hls, AV_LOG_ERROR,
326 "error opening key info file %s\n", hls->key_info_file);
330 ff_get_line(pb, hls->key_uri, sizeof(hls->key_uri));
331 hls->key_uri[strcspn(hls->key_uri, "\r\n")] = '\0';
333 ff_get_line(pb, hls->key_file, sizeof(hls->key_file));
334 hls->key_file[strcspn(hls->key_file, "\r\n")] = '\0';
336 ff_get_line(pb, hls->iv_string, sizeof(hls->iv_string));
337 hls->iv_string[strcspn(hls->iv_string, "\r\n")] = '\0';
339 ff_format_io_close(s, &pb);
341 if (!*hls->key_uri) {
342 av_log(hls, AV_LOG_ERROR, "no key URI specified in key info file\n");
343 return AVERROR(EINVAL);
346 if (!*hls->key_file) {
347 av_log(hls, AV_LOG_ERROR, "no key file specified in key info file\n");
348 return AVERROR(EINVAL);
351 if ((ret = s->io_open(s, &pb, hls->key_file, AVIO_FLAG_READ, NULL)) < 0) {
352 av_log(hls, AV_LOG_ERROR, "error opening key file %s\n", hls->key_file);
356 ret = avio_read(pb, key, sizeof(key));
357 ff_format_io_close(s, &pb);
358 if (ret != sizeof(key)) {
359 av_log(hls, AV_LOG_ERROR, "error reading key file %s\n", hls->key_file);
360 if (ret >= 0 || ret == AVERROR_EOF)
361 ret = AVERROR(EINVAL);
364 ff_data_to_hex(hls->key_string, key, sizeof(key), 0);
369 static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)
371 int len = ff_get_line(s, buf, maxlen);
372 while (len > 0 && av_isspace(buf[len - 1]))
377 static int hls_mux_init(AVFormatContext *s)
379 HLSContext *hls = s->priv_data;
381 AVFormatContext *vtt_oc = NULL;
384 ret = avformat_alloc_output_context2(&hls->avf, hls->oformat, NULL, NULL);
389 oc->oformat = hls->oformat;
390 oc->interrupt_callback = s->interrupt_callback;
391 oc->max_delay = s->max_delay;
392 oc->opaque = s->opaque;
393 oc->io_open = s->io_open;
394 oc->io_close = s->io_close;
395 av_dict_copy(&oc->metadata, s->metadata, 0);
397 if(hls->vtt_oformat) {
398 ret = avformat_alloc_output_context2(&hls->vtt_avf, hls->vtt_oformat, NULL, NULL);
401 vtt_oc = hls->vtt_avf;
402 vtt_oc->oformat = hls->vtt_oformat;
403 av_dict_copy(&vtt_oc->metadata, s->metadata, 0);
406 for (i = 0; i < s->nb_streams; i++) {
408 AVFormatContext *loc;
409 if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
414 if (!(st = avformat_new_stream(loc, NULL)))
415 return AVERROR(ENOMEM);
416 avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
417 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
418 st->time_base = s->streams[i]->time_base;
425 static HLSSegment *find_segment_by_filename(HLSSegment *segment, const char *filename)
428 if (!av_strcasecmp(segment->filename,filename))
430 segment = segment->next;
432 return (HLSSegment *) NULL;
435 /* Create a new segment and append it to the segment list */
436 static int hls_append_segment(struct AVFormatContext *s, HLSContext *hls, double duration,
437 int64_t pos, int64_t size)
439 HLSSegment *en = av_malloc(sizeof(*en));
440 const char *filename;
444 return AVERROR(ENOMEM);
446 if ((hls->flags & (HLS_SECOND_LEVEL_SEGMENT_SIZE | HLS_SECOND_LEVEL_SEGMENT_DURATION)) &&
447 strlen(hls->current_segment_final_filename_fmt)) {
448 char * old_filename = av_strdup(hls->avf->filename); // %%s will be %s after strftime
451 return AVERROR(ENOMEM);
453 av_strlcpy(hls->avf->filename, hls->current_segment_final_filename_fmt, sizeof(hls->avf->filename));
454 if (hls->flags & HLS_SECOND_LEVEL_SEGMENT_SIZE) {
455 char * filename = av_strdup(hls->avf->filename); // %%s will be %s after strftime
457 av_free(old_filename);
459 return AVERROR(ENOMEM);
461 if (replace_int_data_in_filename(hls->avf->filename, sizeof(hls->avf->filename),
462 filename, 's', pos + size) < 1) {
463 av_log(hls, AV_LOG_ERROR,
464 "Invalid second level segment filename template '%s', "
465 "you can try to remove second_level_segment_size flag\n",
468 av_free(old_filename);
470 return AVERROR(EINVAL);
474 if (hls->flags & HLS_SECOND_LEVEL_SEGMENT_DURATION) {
475 char * filename = av_strdup(hls->avf->filename); // %%t will be %t after strftime
477 av_free(old_filename);
479 return AVERROR(ENOMEM);
481 if (replace_int_data_in_filename(hls->avf->filename, sizeof(hls->avf->filename),
482 filename, 't', (int64_t)round(1000000 * duration)) < 1) {
483 av_log(hls, AV_LOG_ERROR,
484 "Invalid second level segment filename template '%s', "
485 "you can try to remove second_level_segment_time flag\n",
488 av_free(old_filename);
490 return AVERROR(EINVAL);
494 ff_rename(old_filename, hls->avf->filename, hls);
495 av_free(old_filename);
499 filename = av_basename(hls->avf->filename);
501 if (hls->use_localtime_mkdir) {
502 filename = hls->avf->filename;
504 if (find_segment_by_filename(hls->segments, filename)
505 || find_segment_by_filename(hls->old_segments, filename)) {
506 av_log(hls, AV_LOG_WARNING, "Duplicated segment filename detected: %s\n", filename);
508 av_strlcpy(en->filename, filename, sizeof(en->filename));
510 if(hls->has_subtitle)
511 av_strlcpy(en->sub_filename, av_basename(hls->vtt_avf->filename), sizeof(en->sub_filename));
513 en->sub_filename[0] = '\0';
515 en->duration = duration;
521 if (hls->discontinuity) {
523 hls->discontinuity = 0;
526 if (hls->key_info_file) {
527 av_strlcpy(en->key_uri, hls->key_uri, sizeof(en->key_uri));
528 av_strlcpy(en->iv_string, hls->iv_string, sizeof(en->iv_string));
534 hls->last_segment->next = en;
536 hls->last_segment = en;
538 // EVENT or VOD playlists imply sliding window cannot be used
539 if (hls->pl_type != PLAYLIST_TYPE_NONE)
540 hls->max_nb_segments = 0;
542 if (hls->max_nb_segments && hls->nb_entries >= hls->max_nb_segments) {
544 hls->initial_prog_date_time += en->duration;
545 hls->segments = en->next;
546 if (en && hls->flags & HLS_DELETE_SEGMENTS &&
547 !(hls->flags & HLS_SINGLE_FILE || hls->wrap)) {
548 en->next = hls->old_segments;
549 hls->old_segments = en;
550 if ((ret = hls_delete_old_segments(hls)) < 0)
557 if (hls->max_seg_size > 0) {
565 static int parse_playlist(AVFormatContext *s, const char *url)
567 HLSContext *hls = s->priv_data;
569 int ret = 0, is_segment = 0;
570 int64_t new_start_pos;
574 if ((ret = ffio_open_whitelist(&in, url, AVIO_FLAG_READ,
575 &s->interrupt_callback, NULL,
576 s->protocol_whitelist, s->protocol_blacklist)) < 0)
579 read_chomp_line(in, line, sizeof(line));
580 if (strcmp(line, "#EXTM3U")) {
581 ret = AVERROR_INVALIDDATA;
585 hls->discontinuity = 0;
586 while (!avio_feof(in)) {
587 read_chomp_line(in, line, sizeof(line));
588 if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
589 hls->sequence = atoi(ptr);
590 } else if (av_strstart(line, "#EXT-X-DISCONTINUITY", &ptr)) {
592 hls->discontinuity = 1;
593 } else if (av_strstart(line, "#EXTINF:", &ptr)) {
595 hls->duration = atof(ptr);
596 } else if (av_strstart(line, "#", NULL)) {
598 } else if (line[0]) {
601 new_start_pos = avio_tell(hls->avf->pb);
602 hls->size = new_start_pos - hls->start_pos;
603 av_strlcpy(hls->avf->filename, line, sizeof(line));
604 ret = hls_append_segment(s, hls, hls->duration, hls->start_pos, hls->size);
607 hls->start_pos = new_start_pos;
617 static void hls_free_segments(HLSSegment *p)
628 static void set_http_options(AVDictionary **options, HLSContext *c)
631 av_dict_set(options, "method", c->method, 0);
634 static int hls_window(AVFormatContext *s, int last)
636 HLSContext *hls = s->priv_data;
638 int target_duration = 0;
640 AVIOContext *out = NULL;
641 AVIOContext *sub_out = NULL;
642 char temp_filename[1024];
643 int64_t sequence = FFMAX(hls->start_sequence, hls->sequence - hls->nb_entries);
645 const char *proto = avio_find_protocol_name(s->filename);
646 int use_rename = proto && !strcmp(proto, "file");
647 static unsigned warned_non_file;
648 char *key_uri = NULL;
649 char *iv_string = NULL;
650 AVDictionary *options = NULL;
651 double prog_date_time = hls->initial_prog_date_time;
652 int byterange_mode = (hls->flags & HLS_SINGLE_FILE) || (hls->max_seg_size > 0);
654 if (byterange_mode) {
659 if (!use_rename && !warned_non_file++)
660 av_log(s, AV_LOG_ERROR, "Cannot use rename on non file protocol, this may lead to races and temporary partial files\n");
662 set_http_options(&options, hls);
663 snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", s->filename);
664 if ((ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, &options)) < 0)
667 for (en = hls->segments; en; en = en->next) {
668 if (target_duration < en->duration)
669 target_duration = ceil(en->duration);
672 hls->discontinuity_set = 0;
673 avio_printf(out, "#EXTM3U\n");
674 avio_printf(out, "#EXT-X-VERSION:%d\n", version);
675 if (hls->allowcache == 0 || hls->allowcache == 1) {
676 avio_printf(out, "#EXT-X-ALLOW-CACHE:%s\n", hls->allowcache == 0 ? "NO" : "YES");
678 avio_printf(out, "#EXT-X-TARGETDURATION:%d\n", target_duration);
679 avio_printf(out, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
680 if (hls->pl_type == PLAYLIST_TYPE_EVENT) {
681 avio_printf(out, "#EXT-X-PLAYLIST-TYPE:EVENT\n");
682 } else if (hls->pl_type == PLAYLIST_TYPE_VOD) {
683 avio_printf(out, "#EXT-X-PLAYLIST-TYPE:VOD\n");
686 av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n",
688 if((hls->flags & HLS_DISCONT_START) && sequence==hls->start_sequence && hls->discontinuity_set==0 ){
689 avio_printf(out, "#EXT-X-DISCONTINUITY\n");
690 hls->discontinuity_set = 1;
692 for (en = hls->segments; en; en = en->next) {
693 if (hls->key_info_file && (!key_uri || strcmp(en->key_uri, key_uri) ||
694 av_strcasecmp(en->iv_string, iv_string))) {
695 avio_printf(out, "#EXT-X-KEY:METHOD=AES-128,URI=\"%s\"", en->key_uri);
697 avio_printf(out, ",IV=0x%s", en->iv_string);
698 avio_printf(out, "\n");
699 key_uri = en->key_uri;
700 iv_string = en->iv_string;
704 avio_printf(out, "#EXT-X-DISCONTINUITY\n");
707 if (hls->flags & HLS_ROUND_DURATIONS)
708 avio_printf(out, "#EXTINF:%ld,\n", lrint(en->duration));
710 avio_printf(out, "#EXTINF:%f,\n", en->duration);
712 avio_printf(out, "#EXT-X-BYTERANGE:%"PRIi64"@%"PRIi64"\n",
714 if (hls->flags & HLS_PROGRAM_DATE_TIME) {
715 time_t tt, wrongsecs;
717 struct tm *tm, tmpbuf;
718 char buf0[128], buf1[128];
719 tt = (int64_t)prog_date_time;
720 milli = av_clip(lrint(1000*(prog_date_time - tt)), 0, 999);
721 tm = localtime_r(&tt, &tmpbuf);
722 strftime(buf0, sizeof(buf0), "%Y-%m-%dT%H:%M:%S", tm);
723 if (!strftime(buf1, sizeof(buf1), "%z", tm) || buf1[1]<'0' ||buf1[1]>'2') {
724 int tz_min, dst = tm->tm_isdst;
725 tm = gmtime_r(&tt, &tmpbuf);
727 wrongsecs = mktime(tm);
728 tz_min = (abs(wrongsecs - tt) + 30) / 60;
729 snprintf(buf1, sizeof(buf1),
731 wrongsecs <= tt ? '+' : '-',
735 avio_printf(out, "#EXT-X-PROGRAM-DATE-TIME:%s.%03d%s\n", buf0, milli, buf1);
736 prog_date_time += en->duration;
739 avio_printf(out, "%s", hls->baseurl);
740 avio_printf(out, "%s\n", en->filename);
743 if (last && (hls->flags & HLS_OMIT_ENDLIST)==0)
744 avio_printf(out, "#EXT-X-ENDLIST\n");
746 if( hls->vtt_m3u8_name ) {
747 if ((ret = s->io_open(s, &sub_out, hls->vtt_m3u8_name, AVIO_FLAG_WRITE, &options)) < 0)
749 avio_printf(sub_out, "#EXTM3U\n");
750 avio_printf(sub_out, "#EXT-X-VERSION:%d\n", version);
751 if (hls->allowcache == 0 || hls->allowcache == 1) {
752 avio_printf(sub_out, "#EXT-X-ALLOW-CACHE:%s\n", hls->allowcache == 0 ? "NO" : "YES");
754 avio_printf(sub_out, "#EXT-X-TARGETDURATION:%d\n", target_duration);
755 avio_printf(sub_out, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
757 av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n",
760 for (en = hls->segments; en; en = en->next) {
761 avio_printf(sub_out, "#EXTINF:%f,\n", en->duration);
763 avio_printf(sub_out, "#EXT-X-BYTERANGE:%"PRIi64"@%"PRIi64"\n",
766 avio_printf(sub_out, "%s", hls->baseurl);
767 avio_printf(sub_out, "%s\n", en->sub_filename);
771 avio_printf(sub_out, "#EXT-X-ENDLIST\n");
776 av_dict_free(&options);
777 ff_format_io_close(s, &out);
778 ff_format_io_close(s, &sub_out);
779 if (ret >= 0 && use_rename)
780 ff_rename(temp_filename, s->filename, s);
784 static int hls_start(AVFormatContext *s)
786 HLSContext *c = s->priv_data;
787 AVFormatContext *oc = c->avf;
788 AVFormatContext *vtt_oc = c->vtt_avf;
789 AVDictionary *options = NULL;
790 char *filename, iv_string[KEYSIZE*2 + 1];
793 if (c->flags & HLS_SINGLE_FILE) {
794 av_strlcpy(oc->filename, c->basename,
795 sizeof(oc->filename));
797 av_strlcpy(vtt_oc->filename, c->vtt_basename,
798 sizeof(vtt_oc->filename));
799 } else if (c->max_seg_size > 0) {
800 if (av_get_frame_filename2(oc->filename, sizeof(oc->filename),
801 c->basename, c->wrap ? c->sequence % c->wrap : c->sequence,
802 AV_FRAME_FILENAME_FLAGS_MULTIPLE) < 0) {
803 av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s', you can try to use -use_localtime 1 with it\n", c->basename);
804 return AVERROR(EINVAL);
807 if (c->use_localtime) {
809 struct tm *tm, tmpbuf;
811 tm = localtime_r(&now0, &tmpbuf);
812 if (!strftime(oc->filename, sizeof(oc->filename), c->basename, tm)) {
813 av_log(oc, AV_LOG_ERROR, "Could not get segment filename with use_localtime\n");
814 return AVERROR(EINVAL);
816 if (c->flags & HLS_SECOND_LEVEL_SEGMENT_INDEX) {
817 char * filename = av_strdup(oc->filename); // %%d will be %d after strftime
819 return AVERROR(ENOMEM);
820 if (replace_int_data_in_filename(oc->filename, sizeof(oc->filename),
821 filename, 'd', c->wrap ? c->sequence % c->wrap : c->sequence) < 1) {
822 av_log(c, AV_LOG_ERROR,
823 "Invalid second level segment filename template '%s', "
824 "you can try to remove second_level_segment_index flag\n",
827 return AVERROR(EINVAL);
831 if (c->flags & (HLS_SECOND_LEVEL_SEGMENT_SIZE | HLS_SECOND_LEVEL_SEGMENT_DURATION)) {
832 av_strlcpy(c->current_segment_final_filename_fmt, oc->filename,
833 sizeof(c->current_segment_final_filename_fmt));
834 if (c->flags & HLS_SECOND_LEVEL_SEGMENT_SIZE) {
835 char * filename = av_strdup(oc->filename); // %%s will be %s after strftime
837 return AVERROR(ENOMEM);
838 if (replace_int_data_in_filename(oc->filename, sizeof(oc->filename), filename, 's', 0) < 1) {
839 av_log(c, AV_LOG_ERROR,
840 "Invalid second level segment filename template '%s', "
841 "you can try to remove second_level_segment_size flag\n",
844 return AVERROR(EINVAL);
848 if (c->flags & HLS_SECOND_LEVEL_SEGMENT_DURATION) {
849 char * filename = av_strdup(oc->filename); // %%t will be %t after strftime
851 return AVERROR(ENOMEM);
852 if (replace_int_data_in_filename(oc->filename, sizeof(oc->filename), filename, 't', 0) < 1) {
853 av_log(c, AV_LOG_ERROR,
854 "Invalid second level segment filename template '%s', "
855 "you can try to remove second_level_segment_time flag\n",
858 return AVERROR(EINVAL);
863 if (c->use_localtime_mkdir) {
865 char *fn_copy = av_strdup(oc->filename);
867 return AVERROR(ENOMEM);
869 dir = av_dirname(fn_copy);
870 if (mkdir_p(dir) == -1 && errno != EEXIST) {
871 av_log(oc, AV_LOG_ERROR, "Could not create directory %s with use_localtime_mkdir\n", dir);
873 return AVERROR(errno);
877 } else if (av_get_frame_filename2(oc->filename, sizeof(oc->filename),
878 c->basename, c->wrap ? c->sequence % c->wrap : c->sequence,
879 AV_FRAME_FILENAME_FLAGS_MULTIPLE) < 0) {
880 av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s' you can try to use -use_localtime 1 with it\n", c->basename);
881 return AVERROR(EINVAL);
883 if( c->vtt_basename) {
884 if (av_get_frame_filename2(vtt_oc->filename, sizeof(vtt_oc->filename),
885 c->vtt_basename, c->wrap ? c->sequence % c->wrap : c->sequence,
886 AV_FRAME_FILENAME_FLAGS_MULTIPLE) < 0) {
887 av_log(vtt_oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", c->vtt_basename);
888 return AVERROR(EINVAL);
894 set_http_options(&options, c);
896 if (c->key_info_file) {
897 if ((err = hls_encryption_start(s)) < 0)
899 if ((err = av_dict_set(&options, "encryption_key", c->key_string, 0))
902 err = av_strlcpy(iv_string, c->iv_string, sizeof(iv_string));
904 snprintf(iv_string, sizeof(iv_string), "%032"PRIx64, c->sequence);
905 if ((err = av_dict_set(&options, "encryption_iv", iv_string, 0)) < 0)
908 filename = av_asprintf("crypto:%s", oc->filename);
910 err = AVERROR(ENOMEM);
913 err = s->io_open(s, &oc->pb, filename, AVIO_FLAG_WRITE, &options);
915 av_dict_free(&options);
919 if ((err = s->io_open(s, &oc->pb, oc->filename, AVIO_FLAG_WRITE, &options)) < 0)
921 if (c->vtt_basename) {
922 set_http_options(&options, c);
923 if ((err = s->io_open(s, &vtt_oc->pb, vtt_oc->filename, AVIO_FLAG_WRITE, &options)) < 0)
926 av_dict_free(&options);
928 /* We only require one PAT/PMT per segment. */
929 if (oc->oformat->priv_class && oc->priv_data) {
932 snprintf(period, sizeof(period), "%d", (INT_MAX / 2) - 1);
934 av_opt_set(oc->priv_data, "mpegts_flags", "resend_headers", 0);
935 av_opt_set(oc->priv_data, "sdt_period", period, 0);
936 av_opt_set(oc->priv_data, "pat_period", period, 0);
939 if (c->vtt_basename) {
940 err = avformat_write_header(vtt_oc,NULL);
947 av_dict_free(&options);
952 static const char * get_default_pattern_localtime_fmt(void)
955 time_t t = time(NULL);
957 p = localtime_r(&t, &tmbuf);
958 // no %s support when strftime returned error or left format string unchanged
959 return (!strftime(b, sizeof(b), "%s", p) || !strcmp(b, "%s")) ? "-%Y%m%d%H%M%S.ts" : "-%s.ts";
962 static int hls_write_header(AVFormatContext *s)
964 HLSContext *hls = s->priv_data;
967 const char *pattern = "%d.ts";
968 const char *pattern_localtime_fmt = get_default_pattern_localtime_fmt();
969 const char *vtt_pattern = "%d.vtt";
970 AVDictionary *options = NULL;
972 int vtt_basename_size;
974 hls->sequence = hls->start_sequence;
975 hls->recording_time = (hls->init_time ? hls->init_time : hls->time) * AV_TIME_BASE;
976 hls->start_pts = AV_NOPTS_VALUE;
977 hls->current_segment_final_filename_fmt[0] = '\0';
979 if (hls->flags & HLS_PROGRAM_DATE_TIME) {
982 hls->initial_prog_date_time = now0;
985 if (hls->format_options_str) {
986 ret = av_dict_parse_string(&hls->format_options, hls->format_options_str, "=", ":", 0);
988 av_log(s, AV_LOG_ERROR, "Could not parse format options list '%s'\n", hls->format_options_str);
993 for (i = 0; i < s->nb_streams; i++) {
995 s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO;
997 s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE;
1000 if (hls->has_video > 1)
1001 av_log(s, AV_LOG_WARNING,
1002 "More than a single video stream present, "
1003 "expect issues decoding it.\n");
1005 hls->oformat = av_guess_format("mpegts", NULL, NULL);
1007 if (!hls->oformat) {
1008 ret = AVERROR_MUXER_NOT_FOUND;
1012 if(hls->has_subtitle) {
1013 hls->vtt_oformat = av_guess_format("webvtt", NULL, NULL);
1014 if (!hls->oformat) {
1015 ret = AVERROR_MUXER_NOT_FOUND;
1020 if (hls->segment_filename) {
1021 hls->basename = av_strdup(hls->segment_filename);
1022 if (!hls->basename) {
1023 ret = AVERROR(ENOMEM);
1027 if (hls->flags & HLS_SINGLE_FILE)
1030 if (hls->use_localtime) {
1031 basename_size = strlen(s->filename) + strlen(pattern_localtime_fmt) + 1;
1033 basename_size = strlen(s->filename) + strlen(pattern) + 1;
1035 hls->basename = av_malloc(basename_size);
1036 if (!hls->basename) {
1037 ret = AVERROR(ENOMEM);
1041 av_strlcpy(hls->basename, s->filename, basename_size);
1043 p = strrchr(hls->basename, '.');
1046 if (hls->use_localtime) {
1047 av_strlcat(hls->basename, pattern_localtime_fmt, basename_size);
1049 av_strlcat(hls->basename, pattern, basename_size);
1052 if (!hls->use_localtime) {
1053 if (hls->flags & HLS_SECOND_LEVEL_SEGMENT_DURATION) {
1054 av_log(hls, AV_LOG_ERROR,
1055 "second_level_segment_duration hls_flag requires use_localtime to be true\n");
1056 ret = AVERROR(EINVAL);
1059 if (hls->flags & HLS_SECOND_LEVEL_SEGMENT_SIZE) {
1060 av_log(hls, AV_LOG_ERROR,
1061 "second_level_segment_size hls_flag requires use_localtime to be true\n");
1062 ret = AVERROR(EINVAL);
1065 if (hls->flags & HLS_SECOND_LEVEL_SEGMENT_INDEX) {
1066 av_log(hls, AV_LOG_ERROR,
1067 "second_level_segment_index hls_flag requires use_localtime to be true\n");
1068 ret = AVERROR(EINVAL);
1072 const char *proto = avio_find_protocol_name(hls->basename);
1073 int segment_renaming_ok = proto && !strcmp(proto, "file");
1075 if ((hls->flags & HLS_SECOND_LEVEL_SEGMENT_DURATION) && !segment_renaming_ok) {
1076 av_log(hls, AV_LOG_ERROR,
1077 "second_level_segment_duration hls_flag works only with file protocol segment names\n");
1078 ret = AVERROR(EINVAL);
1081 if ((hls->flags & HLS_SECOND_LEVEL_SEGMENT_SIZE) && !segment_renaming_ok) {
1082 av_log(hls, AV_LOG_ERROR,
1083 "second_level_segment_size hls_flag works only with file protocol segment names\n");
1084 ret = AVERROR(EINVAL);
1088 if(hls->has_subtitle) {
1090 if (hls->flags & HLS_SINGLE_FILE)
1091 vtt_pattern = ".vtt";
1092 vtt_basename_size = strlen(s->filename) + strlen(vtt_pattern) + 1;
1093 hls->vtt_basename = av_malloc(vtt_basename_size);
1094 if (!hls->vtt_basename) {
1095 ret = AVERROR(ENOMEM);
1098 hls->vtt_m3u8_name = av_malloc(vtt_basename_size);
1099 if (!hls->vtt_m3u8_name ) {
1100 ret = AVERROR(ENOMEM);
1103 av_strlcpy(hls->vtt_basename, s->filename, vtt_basename_size);
1104 p = strrchr(hls->vtt_basename, '.');
1108 if( hls->subtitle_filename ) {
1109 strcpy(hls->vtt_m3u8_name, hls->subtitle_filename);
1111 strcpy(hls->vtt_m3u8_name, hls->vtt_basename);
1112 av_strlcat(hls->vtt_m3u8_name, "_vtt.m3u8", vtt_basename_size);
1114 av_strlcat(hls->vtt_basename, vtt_pattern, vtt_basename_size);
1117 if ((ret = hls_mux_init(s)) < 0)
1120 if (hls->flags & HLS_APPEND_LIST) {
1121 parse_playlist(s, s->filename);
1122 hls->discontinuity = 1;
1123 if (hls->init_time > 0) {
1124 av_log(s, AV_LOG_WARNING, "append_list mode does not support hls_init_time,"
1125 " hls_init_time value will have no effect\n");
1127 hls->recording_time = hls->time * AV_TIME_BASE;
1131 if ((ret = hls_start(s)) < 0)
1134 av_dict_copy(&options, hls->format_options, 0);
1135 ret = avformat_write_header(hls->avf, &options);
1136 if (av_dict_count(options)) {
1137 av_log(s, AV_LOG_ERROR, "Some of provided format options in '%s' are not recognized\n", hls->format_options_str);
1138 ret = AVERROR(EINVAL);
1141 //av_assert0(s->nb_streams == hls->avf->nb_streams);
1142 for (i = 0; i < s->nb_streams; i++) {
1144 AVStream *outer_st = s->streams[i];
1146 if (hls->max_seg_size > 0) {
1147 if ((outer_st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) &&
1148 (outer_st->codecpar->bit_rate > hls->max_seg_size)) {
1149 av_log(s, AV_LOG_WARNING, "Your video bitrate is bigger than hls_segment_size, "
1150 "(%"PRId64 " > %"PRId64 "), the result maybe not be what you want.",
1151 outer_st->codecpar->bit_rate, hls->max_seg_size);
1155 if (outer_st->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
1156 inner_st = hls->avf->streams[i];
1157 else if (hls->vtt_avf)
1158 inner_st = hls->vtt_avf->streams[0];
1160 /* We have a subtitle stream, when the user does not want one */
1164 avpriv_set_pts_info(outer_st, inner_st->pts_wrap_bits, inner_st->time_base.num, inner_st->time_base.den);
1168 av_dict_free(&options);
1170 av_freep(&hls->basename);
1171 av_freep(&hls->vtt_basename);
1173 avformat_free_context(hls->avf);
1175 avformat_free_context(hls->vtt_avf);
1181 static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
1183 HLSContext *hls = s->priv_data;
1184 AVFormatContext *oc = NULL;
1185 AVStream *st = s->streams[pkt->stream_index];
1186 int64_t end_pts = hls->recording_time * hls->number;
1188 int ret, can_split = 1;
1189 int stream_index = 0;
1191 if (hls->sequence - hls->nb_entries > hls->start_sequence && hls->init_time > 0) {
1192 /* reset end_pts, hls->recording_time at end of the init hls list */
1193 int init_list_dur = hls->init_time * hls->nb_entries * AV_TIME_BASE;
1194 int after_init_list_dur = (hls->sequence - hls->nb_entries ) * hls->time * AV_TIME_BASE;
1195 hls->recording_time = hls->time * AV_TIME_BASE;
1196 end_pts = init_list_dur + after_init_list_dur ;
1199 if( st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE ) {
1204 stream_index = pkt->stream_index;
1206 if (hls->start_pts == AV_NOPTS_VALUE) {
1207 hls->start_pts = pkt->pts;
1208 hls->end_pts = pkt->pts;
1211 if (hls->has_video) {
1212 can_split = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
1213 ((pkt->flags & AV_PKT_FLAG_KEY) || (hls->flags & HLS_SPLIT_BY_TIME));
1214 is_ref_pkt = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO;
1216 if (pkt->pts == AV_NOPTS_VALUE)
1217 is_ref_pkt = can_split = 0;
1220 hls->duration = (double)(pkt->pts - hls->end_pts)
1221 * st->time_base.num / st->time_base.den;
1223 if (can_split && av_compare_ts(pkt->pts - hls->start_pts, st->time_base,
1224 end_pts, AV_TIME_BASE_Q) >= 0) {
1225 int64_t new_start_pos;
1226 av_write_frame(oc, NULL); /* Flush any buffered data */
1228 new_start_pos = avio_tell(hls->avf->pb);
1229 hls->size = new_start_pos - hls->start_pos;
1230 ret = hls_append_segment(s, hls, hls->duration, hls->start_pos, hls->size);
1231 hls->start_pos = new_start_pos;
1235 hls->end_pts = pkt->pts;
1238 if (hls->flags & HLS_SINGLE_FILE) {
1239 if (hls->avf->oformat->priv_class && hls->avf->priv_data)
1240 av_opt_set(hls->avf->priv_data, "mpegts_flags", "resend_headers", 0);
1242 } else if (hls->max_seg_size > 0) {
1243 if (hls->avf->oformat->priv_class && hls->avf->priv_data)
1244 av_opt_set(hls->avf->priv_data, "mpegts_flags", "resend_headers", 0);
1245 if (hls->start_pos >= hls->max_seg_size) {
1247 ff_format_io_close(s, &oc->pb);
1249 ff_format_io_close(s, &hls->vtt_avf->pb);
1252 /* When split segment by byte, the duration is short than hls_time,
1253 * so it is not enough one segment duration as hls_time, */
1258 ff_format_io_close(s, &oc->pb);
1260 ff_format_io_close(s, &hls->vtt_avf->pb);
1268 if( st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE )
1273 if ((ret = hls_window(s, 0)) < 0)
1277 ret = ff_write_chained(oc, stream_index, pkt, s, 0);
1282 static int hls_write_trailer(struct AVFormatContext *s)
1284 HLSContext *hls = s->priv_data;
1285 AVFormatContext *oc = hls->avf;
1286 AVFormatContext *vtt_oc = hls->vtt_avf;
1288 av_write_trailer(oc);
1290 hls->size = avio_tell(hls->avf->pb) - hls->start_pos;
1291 ff_format_io_close(s, &oc->pb);
1292 hls_append_segment(s, hls, hls->duration, hls->start_pos, hls->size);
1297 av_write_trailer(vtt_oc);
1298 hls->size = avio_tell(hls->vtt_avf->pb) - hls->start_pos;
1299 ff_format_io_close(s, &vtt_oc->pb);
1301 av_freep(&hls->basename);
1302 avformat_free_context(oc);
1308 av_freep(&hls->vtt_basename);
1309 av_freep(&hls->vtt_m3u8_name);
1310 avformat_free_context(vtt_oc);
1313 hls_free_segments(hls->segments);
1314 hls_free_segments(hls->old_segments);
1318 #define OFFSET(x) offsetof(HLSContext, x)
1319 #define E AV_OPT_FLAG_ENCODING_PARAM
1320 static const AVOption options[] = {
1321 {"start_number", "set first number in the sequence", OFFSET(start_sequence),AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, E},
1322 {"hls_time", "set segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E},
1323 {"hls_init_time", "set segment length in seconds at init list", OFFSET(init_time), AV_OPT_TYPE_FLOAT, {.dbl = 0}, 0, FLT_MAX, E},
1324 {"hls_list_size", "set maximum number of playlist entries", OFFSET(max_nb_segments), AV_OPT_TYPE_INT, {.i64 = 5}, 0, INT_MAX, E},
1325 {"hls_ts_options","set hls mpegts list of options for the container format used for hls", OFFSET(format_options_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
1326 {"hls_vtt_options","set hls vtt list of options for the container format used for hls", OFFSET(vtt_format_options_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
1327 {"hls_wrap", "set number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E},
1328 {"hls_allow_cache", "explicitly set whether the client MAY (1) or MUST NOT (0) cache media segments", OFFSET(allowcache), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, E},
1329 {"hls_base_url", "url to prepend to each playlist entry", OFFSET(baseurl), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
1330 {"hls_segment_filename", "filename template for segment files", OFFSET(segment_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
1331 {"hls_segment_size", "maximum size per segment file, (in bytes)", OFFSET(max_seg_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E},
1332 {"hls_key_info_file", "file with key URI and key file path", OFFSET(key_info_file), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
1333 {"hls_subtitle_path", "set path of hls subtitles", OFFSET(subtitle_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
1334 {"hls_flags", "set flags affecting HLS playlist and media file generation", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0 }, 0, UINT_MAX, E, "flags"},
1335 {"single_file", "generate a single media file indexed with byte ranges", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SINGLE_FILE }, 0, UINT_MAX, E, "flags"},
1336 {"delete_segments", "delete segment files that are no longer part of the playlist", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_DELETE_SEGMENTS }, 0, UINT_MAX, E, "flags"},
1337 {"round_durations", "round durations in m3u8 to whole numbers", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_ROUND_DURATIONS }, 0, UINT_MAX, E, "flags"},
1338 {"discont_start", "start the playlist with a discontinuity tag", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_DISCONT_START }, 0, UINT_MAX, E, "flags"},
1339 {"omit_endlist", "Do not append an endlist when ending stream", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_OMIT_ENDLIST }, 0, UINT_MAX, E, "flags"},
1340 {"split_by_time", "split the hls segment by time which user set by hls_time", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SPLIT_BY_TIME }, 0, UINT_MAX, E, "flags"},
1341 {"append_list", "append the new segments into old hls segment list", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_APPEND_LIST }, 0, UINT_MAX, E, "flags"},
1342 {"program_date_time", "add EXT-X-PROGRAM-DATE-TIME", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_PROGRAM_DATE_TIME }, 0, UINT_MAX, E, "flags"},
1343 {"second_level_segment_index", "include segment index in segment filenames when use_localtime", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SECOND_LEVEL_SEGMENT_INDEX }, 0, UINT_MAX, E, "flags"},
1344 {"second_level_segment_duration", "include segment duration in segment filenames when use_localtime", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SECOND_LEVEL_SEGMENT_DURATION }, 0, UINT_MAX, E, "flags"},
1345 {"second_level_segment_size", "include segment size in segment filenames when use_localtime", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SECOND_LEVEL_SEGMENT_SIZE }, 0, UINT_MAX, E, "flags"},
1346 {"use_localtime", "set filename expansion with strftime at segment creation", OFFSET(use_localtime), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
1347 {"use_localtime_mkdir", "create last directory component in strftime-generated filename", OFFSET(use_localtime_mkdir), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
1348 {"hls_playlist_type", "set the HLS playlist type", OFFSET(pl_type), AV_OPT_TYPE_INT, {.i64 = PLAYLIST_TYPE_NONE }, 0, PLAYLIST_TYPE_NB-1, E, "pl_type" },
1349 {"event", "EVENT playlist", 0, AV_OPT_TYPE_CONST, {.i64 = PLAYLIST_TYPE_EVENT }, INT_MIN, INT_MAX, E, "pl_type" },
1350 {"vod", "VOD playlist", 0, AV_OPT_TYPE_CONST, {.i64 = PLAYLIST_TYPE_VOD }, INT_MIN, INT_MAX, E, "pl_type" },
1351 {"method", "set the HTTP method", OFFSET(method), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
1356 static const AVClass hls_class = {
1357 .class_name = "hls muxer",
1358 .item_name = av_default_item_name,
1360 .version = LIBAVUTIL_VERSION_INT,
1364 AVOutputFormat ff_hls_muxer = {
1366 .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
1367 .extensions = "m3u8",
1368 .priv_data_size = sizeof(HLSContext),
1369 .audio_codec = AV_CODEC_ID_AAC,
1370 .video_codec = AV_CODEC_ID_H264,
1371 .subtitle_codec = AV_CODEC_ID_WEBVTT,
1372 .flags = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,
1373 .write_header = hls_write_header,
1374 .write_packet = hls_write_packet,
1375 .write_trailer = hls_write_trailer,
1376 .priv_class = &hls_class,