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"
38 #include "os_support.h"
41 #define LINE_BUFFER_SIZE 1024
43 typedef struct HLSSegment {
45 char sub_filename[1024];
46 double duration; /* in seconds */
50 char key_uri[LINE_BUFFER_SIZE + 1];
51 char iv_string[KEYSIZE*2 + 1];
53 struct HLSSegment *next;
56 typedef enum HLSFlags {
57 // Generate a single media file and use byte ranges in the playlist.
58 HLS_SINGLE_FILE = (1 << 0),
59 HLS_DELETE_SEGMENTS = (1 << 1),
60 HLS_ROUND_DURATIONS = (1 << 2),
61 HLS_DISCONT_START = (1 << 3),
62 HLS_OMIT_ENDLIST = (1 << 4),
65 typedef struct HLSContext {
66 const AVClass *class; // Class for private options.
69 int64_t start_sequence;
70 AVOutputFormat *oformat;
71 AVOutputFormat *vtt_oformat;
74 AVFormatContext *vtt_avf;
76 float time; // Set by a private option.
77 int max_nb_segments; // Set by a private option.
78 int wrap; // Set by a private option.
79 uint32_t flags; // enum HLSFlags
80 char *segment_filename;
83 int64_t recording_time;
88 double duration; // last segment duration computed so far, in seconds
89 int64_t start_pos; // last segment starting position
90 int64_t size; // last segment size
92 int discontinuity_set;
95 HLSSegment *last_segment;
96 HLSSegment *old_segments;
102 char *format_options_str;
103 char *vtt_format_options_str;
104 char *subtitle_filename;
105 AVDictionary *format_options;
108 char key_file[LINE_BUFFER_SIZE + 1];
109 char key_uri[LINE_BUFFER_SIZE + 1];
110 char key_string[KEYSIZE*2 + 1];
111 char iv_string[KEYSIZE*2 + 1];
112 AVDictionary *vtt_format_options;
116 static int hls_delete_old_segments(HLSContext *hls) {
118 HLSSegment *segment, *previous_segment = NULL;
119 float playlist_duration = 0.0f;
120 int ret = 0, path_size, sub_path_size;
121 char *dirname = NULL, *p, *path, *sub_path;
123 segment = hls->segments;
125 playlist_duration += segment->duration;
126 segment = segment->next;
129 segment = hls->old_segments;
131 playlist_duration -= segment->duration;
132 previous_segment = segment;
133 segment = previous_segment->next;
134 if (playlist_duration <= -previous_segment->duration) {
135 previous_segment->next = NULL;
141 if (hls->segment_filename) {
142 dirname = av_strdup(hls->segment_filename);
144 dirname = av_strdup(hls->avf->filename);
147 ret = AVERROR(ENOMEM);
150 p = (char *)av_basename(dirname);
155 av_log(hls, AV_LOG_DEBUG, "deleting old segment %s\n",
157 path_size = strlen(dirname) + strlen(segment->filename) + 1;
158 path = av_malloc(path_size);
160 ret = AVERROR(ENOMEM);
163 sub_path_size = strlen(dirname) + strlen(segment->sub_filename) + 1;
164 sub_path = av_malloc(sub_path_size);
166 ret = AVERROR(ENOMEM);
170 av_strlcpy(path, dirname, path_size);
171 av_strlcat(path, segment->filename, path_size);
172 if (unlink(path) < 0) {
173 av_log(hls, AV_LOG_ERROR, "failed to delete old segment %s: %s\n",
174 path, strerror(errno));
177 av_strlcpy(sub_path, dirname, sub_path_size);
178 av_strlcat(sub_path, segment->sub_filename, sub_path_size);
179 if (unlink(sub_path) < 0) {
180 av_log(hls, AV_LOG_ERROR, "failed to delete old segment %s: %s\n",
181 sub_path, strerror(errno));
185 previous_segment = segment;
186 segment = previous_segment->next;
187 av_free(previous_segment);
196 static int hls_encryption_start(AVFormatContext *s)
198 HLSContext *hls = s->priv_data;
201 uint8_t key[KEYSIZE];
203 if ((ret = avio_open2(&pb, hls->key_info_file, AVIO_FLAG_READ,
204 &s->interrupt_callback, NULL)) < 0) {
205 av_log(hls, AV_LOG_ERROR,
206 "error opening key info file %s\n", hls->key_info_file);
210 ff_get_line(pb, hls->key_uri, sizeof(hls->key_uri));
211 hls->key_uri[strcspn(hls->key_uri, "\r\n")] = '\0';
213 ff_get_line(pb, hls->key_file, sizeof(hls->key_file));
214 hls->key_file[strcspn(hls->key_file, "\r\n")] = '\0';
216 ff_get_line(pb, hls->iv_string, sizeof(hls->iv_string));
217 hls->iv_string[strcspn(hls->iv_string, "\r\n")] = '\0';
221 if (!*hls->key_uri) {
222 av_log(hls, AV_LOG_ERROR, "no key URI specified in key info file\n");
223 return AVERROR(EINVAL);
226 if (!*hls->key_file) {
227 av_log(hls, AV_LOG_ERROR, "no key file specified in key info file\n");
228 return AVERROR(EINVAL);
231 if ((ret = avio_open2(&pb, hls->key_file, AVIO_FLAG_READ,
232 &s->interrupt_callback, NULL)) < 0) {
233 av_log(hls, AV_LOG_ERROR, "error opening key file %s\n", hls->key_file);
237 ret = avio_read(pb, key, sizeof(key));
239 if (ret != sizeof(key)) {
240 av_log(hls, AV_LOG_ERROR, "error reading key file %s\n", hls->key_file);
241 if (ret >= 0 || ret == AVERROR_EOF)
242 ret = AVERROR(EINVAL);
245 ff_data_to_hex(hls->key_string, key, sizeof(key), 0);
250 static int hls_mux_init(AVFormatContext *s)
252 HLSContext *hls = s->priv_data;
254 AVFormatContext *vtt_oc;
257 ret = avformat_alloc_output_context2(&hls->avf, hls->oformat, NULL, NULL);
262 oc->oformat = hls->oformat;
263 oc->interrupt_callback = s->interrupt_callback;
264 oc->max_delay = s->max_delay;
265 av_dict_copy(&oc->metadata, s->metadata, 0);
267 if(hls->vtt_oformat) {
268 ret = avformat_alloc_output_context2(&hls->vtt_avf, hls->vtt_oformat, NULL, NULL);
271 vtt_oc = hls->vtt_avf;
272 vtt_oc->oformat = hls->vtt_oformat;
273 av_dict_copy(&vtt_oc->metadata, s->metadata, 0);
276 for (i = 0; i < s->nb_streams; i++) {
278 AVFormatContext *loc;
279 if (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
284 if (!(st = avformat_new_stream(loc, NULL)))
285 return AVERROR(ENOMEM);
286 avcodec_copy_context(st->codec, s->streams[i]->codec);
287 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
288 st->time_base = s->streams[i]->time_base;
295 /* Create a new segment and append it to the segment list */
296 static int hls_append_segment(HLSContext *hls, double duration, int64_t pos,
299 HLSSegment *en = av_malloc(sizeof(*en));
303 return AVERROR(ENOMEM);
305 av_strlcpy(en->filename, av_basename(hls->avf->filename), sizeof(en->filename));
307 if(hls->has_subtitle)
308 av_strlcpy(en->sub_filename, av_basename(hls->vtt_avf->filename), sizeof(en->sub_filename));
310 en->duration = duration;
315 if (hls->key_info_file) {
316 av_strlcpy(en->key_uri, hls->key_uri, sizeof(en->key_uri));
317 av_strlcpy(en->iv_string, hls->iv_string, sizeof(en->iv_string));
323 hls->last_segment->next = en;
325 hls->last_segment = en;
327 if (hls->max_nb_segments && hls->nb_entries >= hls->max_nb_segments) {
329 hls->segments = en->next;
330 if (en && hls->flags & HLS_DELETE_SEGMENTS &&
331 !(hls->flags & HLS_SINGLE_FILE || hls->wrap)) {
332 en->next = hls->old_segments;
333 hls->old_segments = en;
334 if ((ret = hls_delete_old_segments(hls)) < 0)
346 static void hls_free_segments(HLSSegment *p)
357 static int hls_window(AVFormatContext *s, int last)
359 HLSContext *hls = s->priv_data;
361 int target_duration = 0;
363 AVIOContext *out = NULL;
364 AVIOContext *sub_out = NULL;
365 char temp_filename[1024];
366 int64_t sequence = FFMAX(hls->start_sequence, hls->sequence - hls->nb_entries);
367 int version = hls->flags & HLS_SINGLE_FILE ? 4 : 3;
368 const char *proto = avio_find_protocol_name(s->filename);
369 int use_rename = proto && !strcmp(proto, "file");
370 static unsigned warned_non_file;
371 char *key_uri = NULL;
372 char *iv_string = NULL;
374 if (!use_rename && !warned_non_file++)
375 av_log(s, AV_LOG_ERROR, "Cannot use rename on non file protocol, this may lead to races and temporarly partial files\n");
377 snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", s->filename);
378 if ((ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE,
379 &s->interrupt_callback, NULL)) < 0)
382 for (en = hls->segments; en; en = en->next) {
383 if (target_duration < en->duration)
384 target_duration = ceil(en->duration);
387 hls->discontinuity_set = 0;
388 avio_printf(out, "#EXTM3U\n");
389 avio_printf(out, "#EXT-X-VERSION:%d\n", version);
390 if (hls->allowcache == 0 || hls->allowcache == 1) {
391 avio_printf(out, "#EXT-X-ALLOW-CACHE:%s\n", hls->allowcache == 0 ? "NO" : "YES");
393 avio_printf(out, "#EXT-X-TARGETDURATION:%d\n", target_duration);
394 avio_printf(out, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
396 av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n",
398 if((hls->flags & HLS_DISCONT_START) && sequence==hls->start_sequence && hls->discontinuity_set==0 ){
399 avio_printf(out, "#EXT-X-DISCONTINUITY\n");
400 hls->discontinuity_set = 1;
402 for (en = hls->segments; en; en = en->next) {
403 if (hls->key_info_file && (!key_uri || strcmp(en->key_uri, key_uri) ||
404 av_strcasecmp(en->iv_string, iv_string))) {
405 avio_printf(out, "#EXT-X-KEY:METHOD=AES-128,URI=\"%s\"", en->key_uri);
407 avio_printf(out, ",IV=0x%s", en->iv_string);
408 avio_printf(out, "\n");
409 key_uri = en->key_uri;
410 iv_string = en->iv_string;
413 if (hls->flags & HLS_ROUND_DURATIONS)
414 avio_printf(out, "#EXTINF:%d,\n", (int)round(en->duration));
416 avio_printf(out, "#EXTINF:%f,\n", en->duration);
417 if (hls->flags & HLS_SINGLE_FILE)
418 avio_printf(out, "#EXT-X-BYTERANGE:%"PRIi64"@%"PRIi64"\n",
421 avio_printf(out, "%s", hls->baseurl);
422 avio_printf(out, "%s\n", en->filename);
425 if (last && (hls->flags & HLS_OMIT_ENDLIST)==0)
426 avio_printf(out, "#EXT-X-ENDLIST\n");
428 if( hls->vtt_m3u8_name ) {
429 if ((ret = avio_open2(&sub_out, hls->vtt_m3u8_name, AVIO_FLAG_WRITE,
430 &s->interrupt_callback, NULL)) < 0)
432 avio_printf(sub_out, "#EXTM3U\n");
433 avio_printf(sub_out, "#EXT-X-VERSION:%d\n", version);
434 if (hls->allowcache == 0 || hls->allowcache == 1) {
435 avio_printf(sub_out, "#EXT-X-ALLOW-CACHE:%s\n", hls->allowcache == 0 ? "NO" : "YES");
437 avio_printf(sub_out, "#EXT-X-TARGETDURATION:%d\n", target_duration);
438 avio_printf(sub_out, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
440 av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n",
443 for (en = hls->segments; en; en = en->next) {
444 avio_printf(sub_out, "#EXTINF:%f,\n", en->duration);
445 if (hls->flags & HLS_SINGLE_FILE)
446 avio_printf(sub_out, "#EXT-X-BYTERANGE:%"PRIi64"@%"PRIi64"\n",
449 avio_printf(sub_out, "%s", hls->baseurl);
450 avio_printf(sub_out, "%s\n", en->sub_filename);
454 avio_printf(sub_out, "#EXT-X-ENDLIST\n");
460 avio_closep(&sub_out);
461 if (ret >= 0 && use_rename)
462 ff_rename(temp_filename, s->filename, s);
466 static int hls_start(AVFormatContext *s)
468 HLSContext *c = s->priv_data;
469 AVFormatContext *oc = c->avf;
470 AVFormatContext *vtt_oc = c->vtt_avf;
471 AVDictionary *options = NULL;
472 char *filename, iv_string[KEYSIZE*2 + 1];
475 if (c->flags & HLS_SINGLE_FILE) {
476 av_strlcpy(oc->filename, c->basename,
477 sizeof(oc->filename));
479 av_strlcpy(vtt_oc->filename, c->vtt_basename,
480 sizeof(vtt_oc->filename));
482 if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
483 c->basename, c->wrap ? c->sequence % c->wrap : c->sequence) < 0) {
484 av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", c->basename);
485 return AVERROR(EINVAL);
487 if( c->vtt_basename) {
488 if (av_get_frame_filename(vtt_oc->filename, sizeof(vtt_oc->filename),
489 c->vtt_basename, c->wrap ? c->sequence % c->wrap : c->sequence) < 0) {
490 av_log(vtt_oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", c->vtt_basename);
491 return AVERROR(EINVAL);
497 if (c->key_info_file) {
498 if ((err = hls_encryption_start(s)) < 0)
500 if ((err = av_dict_set(&options, "encryption_key", c->key_string, 0))
503 err = av_strlcpy(iv_string, c->iv_string, sizeof(iv_string));
505 snprintf(iv_string, sizeof(iv_string), "%032"PRIx64, c->sequence);
506 if ((err = av_dict_set(&options, "encryption_iv", iv_string, 0)) < 0)
509 filename = av_asprintf("crypto:%s", oc->filename);
511 av_dict_free(&options);
512 return AVERROR(ENOMEM);
514 err = avio_open2(&oc->pb, filename, AVIO_FLAG_WRITE,
515 &s->interrupt_callback, &options);
517 av_dict_free(&options);
521 if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
522 &s->interrupt_callback, NULL)) < 0)
524 if (c->vtt_basename) {
525 if ((err = avio_open2(&vtt_oc->pb, vtt_oc->filename, AVIO_FLAG_WRITE,
526 &s->interrupt_callback, NULL)) < 0)
530 if (oc->oformat->priv_class && oc->priv_data)
531 av_opt_set(oc->priv_data, "mpegts_flags", "resend_headers", 0);
534 avformat_write_header(vtt_oc,NULL);
539 static int hls_write_header(AVFormatContext *s)
541 HLSContext *hls = s->priv_data;
544 const char *pattern = "%d.ts";
545 const char *vtt_pattern = "%d.vtt";
546 AVDictionary *options = NULL;
548 int vtt_basename_size;
550 hls->sequence = hls->start_sequence;
551 hls->recording_time = hls->time * AV_TIME_BASE;
552 hls->start_pts = AV_NOPTS_VALUE;
554 if (hls->format_options_str) {
555 ret = av_dict_parse_string(&hls->format_options, hls->format_options_str, "=", ":", 0);
557 av_log(s, AV_LOG_ERROR, "Could not parse format options list '%s'\n", hls->format_options_str);
562 for (i = 0; i < s->nb_streams; i++) {
564 s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO;
566 s->streams[i]->codec->codec_type == AVMEDIA_TYPE_SUBTITLE;
569 if (hls->has_video > 1)
570 av_log(s, AV_LOG_WARNING,
571 "More than a single video stream present, "
572 "expect issues decoding it.\n");
574 hls->oformat = av_guess_format("mpegts", NULL, NULL);
577 ret = AVERROR_MUXER_NOT_FOUND;
581 if(hls->has_subtitle) {
582 hls->vtt_oformat = av_guess_format("webvtt", NULL, NULL);
584 ret = AVERROR_MUXER_NOT_FOUND;
589 if (hls->segment_filename) {
590 hls->basename = av_strdup(hls->segment_filename);
591 if (!hls->basename) {
592 ret = AVERROR(ENOMEM);
596 if (hls->flags & HLS_SINGLE_FILE)
599 basename_size = strlen(s->filename) + strlen(pattern) + 1;
600 hls->basename = av_malloc(basename_size);
601 if (!hls->basename) {
602 ret = AVERROR(ENOMEM);
606 av_strlcpy(hls->basename, s->filename, basename_size);
608 p = strrchr(hls->basename, '.');
611 av_strlcat(hls->basename, pattern, basename_size);
614 if(hls->has_subtitle) {
616 if (hls->flags & HLS_SINGLE_FILE)
617 vtt_pattern = ".vtt";
618 vtt_basename_size = strlen(s->filename) + strlen(vtt_pattern) + 1;
619 hls->vtt_basename = av_malloc(vtt_basename_size);
620 if (!hls->vtt_basename) {
621 ret = AVERROR(ENOMEM);
624 hls->vtt_m3u8_name = av_malloc(vtt_basename_size);
625 if (!hls->vtt_m3u8_name ) {
626 ret = AVERROR(ENOMEM);
629 av_strlcpy(hls->vtt_basename, s->filename, vtt_basename_size);
630 p = strrchr(hls->vtt_basename, '.');
634 if( hls->subtitle_filename ) {
635 strcpy(hls->vtt_m3u8_name, hls->subtitle_filename);
637 strcpy(hls->vtt_m3u8_name, hls->vtt_basename);
638 av_strlcat(hls->vtt_m3u8_name, "_vtt.m3u8", vtt_basename_size);
640 av_strlcat(hls->vtt_basename, vtt_pattern, vtt_basename_size);
643 if ((ret = hls_mux_init(s)) < 0)
646 if ((ret = hls_start(s)) < 0)
649 av_dict_copy(&options, hls->format_options, 0);
650 ret = avformat_write_header(hls->avf, &options);
651 if (av_dict_count(options)) {
652 av_log(s, AV_LOG_ERROR, "Some of provided format options in '%s' are not recognized\n", hls->format_options_str);
653 ret = AVERROR(EINVAL);
656 //av_assert0(s->nb_streams == hls->avf->nb_streams);
657 for (i = 0; i < s->nb_streams; i++) {
659 AVStream *outer_st = s->streams[i];
660 if (outer_st->codec->codec_type != AVMEDIA_TYPE_SUBTITLE)
661 inner_st = hls->avf->streams[i];
662 else if (hls->vtt_avf)
663 inner_st = hls->vtt_avf->streams[0];
665 /* We have a subtitle stream, when the user does not want one */
669 avpriv_set_pts_info(outer_st, inner_st->pts_wrap_bits, inner_st->time_base.num, inner_st->time_base.den);
673 av_dict_free(&options);
675 av_freep(&hls->basename);
676 av_freep(&hls->vtt_basename);
678 avformat_free_context(hls->avf);
680 avformat_free_context(hls->vtt_avf);
686 static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
688 HLSContext *hls = s->priv_data;
689 AVFormatContext *oc = NULL;
690 AVStream *st = s->streams[pkt->stream_index];
691 int64_t end_pts = hls->recording_time * hls->number;
693 int ret, can_split = 1;
694 int stream_index = 0;
696 if( st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE ) {
701 stream_index = pkt->stream_index;
703 if (hls->start_pts == AV_NOPTS_VALUE) {
704 hls->start_pts = pkt->pts;
705 hls->end_pts = pkt->pts;
708 if (hls->has_video) {
709 can_split = st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
710 pkt->flags & AV_PKT_FLAG_KEY;
711 is_ref_pkt = st->codec->codec_type == AVMEDIA_TYPE_VIDEO;
713 if (pkt->pts == AV_NOPTS_VALUE)
714 is_ref_pkt = can_split = 0;
717 hls->duration = (double)(pkt->pts - hls->end_pts)
718 * st->time_base.num / st->time_base.den;
720 if (can_split && av_compare_ts(pkt->pts - hls->start_pts, st->time_base,
721 end_pts, AV_TIME_BASE_Q) >= 0) {
722 int64_t new_start_pos;
723 av_write_frame(oc, NULL); /* Flush any buffered data */
725 new_start_pos = avio_tell(hls->avf->pb);
726 hls->size = new_start_pos - hls->start_pos;
727 ret = hls_append_segment(hls, hls->duration, hls->start_pos, hls->size);
728 hls->start_pos = new_start_pos;
732 hls->end_pts = pkt->pts;
735 if (hls->flags & HLS_SINGLE_FILE) {
736 if (hls->avf->oformat->priv_class && hls->avf->priv_data)
737 av_opt_set(hls->avf->priv_data, "mpegts_flags", "resend_headers", 0);
740 avio_closep(&oc->pb);
742 avio_close(hls->vtt_avf->pb);
750 if( st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE )
755 if ((ret = hls_window(s, 0)) < 0)
759 ret = ff_write_chained(oc, stream_index, pkt, s, 0);
764 static int hls_write_trailer(struct AVFormatContext *s)
766 HLSContext *hls = s->priv_data;
767 AVFormatContext *oc = hls->avf;
768 AVFormatContext *vtt_oc = hls->vtt_avf;
770 av_write_trailer(oc);
772 hls->size = avio_tell(hls->avf->pb) - hls->start_pos;
773 avio_closep(&oc->pb);
774 hls_append_segment(hls, hls->duration, hls->start_pos, hls->size);
779 av_write_trailer(vtt_oc);
780 hls->size = avio_tell(hls->vtt_avf->pb) - hls->start_pos;
781 avio_closep(&vtt_oc->pb);
783 av_freep(&hls->basename);
784 avformat_free_context(oc);
787 av_freep(&hls->vtt_basename);
788 av_freep(&hls->vtt_m3u8_name);
789 avformat_free_context(vtt_oc);
795 hls_free_segments(hls->segments);
796 hls_free_segments(hls->old_segments);
800 #define OFFSET(x) offsetof(HLSContext, x)
801 #define E AV_OPT_FLAG_ENCODING_PARAM
802 static const AVOption options[] = {
803 {"start_number", "set first number in the sequence", OFFSET(start_sequence),AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, E},
804 {"hls_time", "set segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E},
805 {"hls_list_size", "set maximum number of playlist entries", OFFSET(max_nb_segments), AV_OPT_TYPE_INT, {.i64 = 5}, 0, INT_MAX, E},
806 {"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},
807 {"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},
808 {"hls_wrap", "set number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E},
809 {"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},
810 {"hls_base_url", "url to prepend to each playlist entry", OFFSET(baseurl), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
811 {"hls_segment_filename", "filename template for segment files", OFFSET(segment_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
812 {"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},
813 {"hls_subtitle_path", "set path of hls subtitles", OFFSET(subtitle_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
814 {"hls_flags", "set flags affecting HLS playlist and media file generation", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0 }, 0, UINT_MAX, E, "flags"},
815 {"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"},
816 {"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"},
817 {"round_durations", "round durations in m3u8 to whole numbers", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_ROUND_DURATIONS }, 0, UINT_MAX, E, "flags"},
818 {"discont_start", "start the playlist with a discontinuity tag", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_DISCONT_START }, 0, UINT_MAX, E, "flags"},
819 {"omit_endlist", "Do not append an endlist when ending stream", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_OMIT_ENDLIST }, 0, UINT_MAX, E, "flags"},
824 static const AVClass hls_class = {
825 .class_name = "hls muxer",
826 .item_name = av_default_item_name,
828 .version = LIBAVUTIL_VERSION_INT,
832 AVOutputFormat ff_hls_muxer = {
834 .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
835 .extensions = "m3u8",
836 .priv_data_size = sizeof(HLSContext),
837 .audio_codec = AV_CODEC_ID_AAC,
838 .video_codec = AV_CODEC_ID_H264,
839 .subtitle_codec = AV_CODEC_ID_WEBVTT,
840 .flags = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,
841 .write_header = hls_write_header,
842 .write_packet = hls_write_packet,
843 .write_trailer = hls_write_trailer,
844 .priv_class = &hls_class,