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
25 #include "libavutil/mathematics.h"
26 #include "libavutil/parseutils.h"
27 #include "libavutil/avstring.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/log.h"
34 typedef struct HLSSegment {
36 double duration; /* in seconds */
40 struct HLSSegment *next;
43 typedef enum HLSFlags {
44 // Generate a single media file and use byte ranges in the playlist.
45 HLS_SINGLE_FILE = (1 << 0),
48 typedef struct HLSContext {
49 const AVClass *class; // Class for private options.
52 int64_t start_sequence;
53 AVOutputFormat *oformat;
57 float time; // Set by a private option.
58 int max_nb_segments; // Set by a private option.
59 int wrap; // Set by a private option.
60 uint32_t flags; // enum HLSFlags
62 int64_t recording_time;
66 double duration; // last segment duration computed so far, in seconds
67 int64_t start_pos; // last segment starting position
68 int64_t size; // last segment size
72 HLSSegment *last_segment;
76 char *format_options_str;
77 AVDictionary *format_options;
82 static int hls_mux_init(AVFormatContext *s)
84 HLSContext *hls = s->priv_data;
88 hls->avf = oc = avformat_alloc_context();
90 return AVERROR(ENOMEM);
92 oc->oformat = hls->oformat;
93 oc->interrupt_callback = s->interrupt_callback;
94 av_dict_copy(&oc->metadata, s->metadata, 0);
96 for (i = 0; i < s->nb_streams; i++) {
98 if (!(st = avformat_new_stream(oc, NULL)))
99 return AVERROR(ENOMEM);
100 avcodec_copy_context(st->codec, s->streams[i]->codec);
101 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
108 /* Create a new segment and append it to the segment list */
109 static int hls_append_segment(HLSContext *hls, double duration, int64_t pos,
112 HLSSegment *en = av_malloc(sizeof(*en));
115 return AVERROR(ENOMEM);
117 av_strlcpy(en->filename, av_basename(hls->avf->filename), sizeof(en->filename));
119 en->duration = duration;
127 hls->last_segment->next = en;
129 hls->last_segment = en;
131 if (hls->max_nb_segments && hls->nb_entries >= hls->max_nb_segments) {
133 hls->segments = en->next;
143 static void hls_free_segments(HLSContext *hls)
145 HLSSegment *p = hls->segments, *en;
154 static int hls_window(AVFormatContext *s, int last)
156 HLSContext *hls = s->priv_data;
158 int target_duration = 0;
160 int64_t sequence = FFMAX(hls->start_sequence, hls->sequence - hls->nb_entries);
161 int version = hls->flags & HLS_SINGLE_FILE ? 4 : 3;
163 if ((ret = avio_open2(&hls->pb, s->filename, AVIO_FLAG_WRITE,
164 &s->interrupt_callback, NULL)) < 0)
167 for (en = hls->segments; en; en = en->next) {
168 if (target_duration < en->duration)
169 target_duration = ceil(en->duration);
172 avio_printf(hls->pb, "#EXTM3U\n");
173 avio_printf(hls->pb, "#EXT-X-VERSION:%d\n", version);
174 avio_printf(hls->pb, "#EXT-X-TARGETDURATION:%d\n", target_duration);
175 avio_printf(hls->pb, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
177 av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n",
180 for (en = hls->segments; en; en = en->next) {
181 avio_printf(hls->pb, "#EXTINF:%f,\n", en->duration);
182 if (hls->flags & HLS_SINGLE_FILE)
183 avio_printf(hls->pb, "#EXT-X-BYTERANGE:%"PRIi64"@%"PRIi64"\n",
186 avio_printf(hls->pb, "%s", hls->baseurl);
187 avio_printf(hls->pb, "%s\n", en->filename);
191 avio_printf(hls->pb, "#EXT-X-ENDLIST\n");
194 avio_closep(&hls->pb);
198 static int hls_start(AVFormatContext *s)
200 HLSContext *c = s->priv_data;
201 AVFormatContext *oc = c->avf;
204 if (c->flags & HLS_SINGLE_FILE)
205 av_strlcpy(oc->filename, c->basename,
206 sizeof(oc->filename));
208 if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
209 c->basename, c->wrap ? c->sequence % c->wrap : c->sequence) < 0) {
210 av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", c->basename);
211 return AVERROR(EINVAL);
215 if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
216 &s->interrupt_callback, NULL)) < 0)
219 if (oc->oformat->priv_class && oc->priv_data)
220 av_opt_set(oc->priv_data, "mpegts_flags", "resend_headers", 0);
225 static int hls_write_header(AVFormatContext *s)
227 HLSContext *hls = s->priv_data;
230 const char *pattern = "%d.ts";
231 AVDictionary *options = NULL;
232 int basename_size = strlen(s->filename) + strlen(pattern) + 1;
234 hls->sequence = hls->start_sequence;
235 hls->recording_time = hls->time * AV_TIME_BASE;
236 hls->start_pts = AV_NOPTS_VALUE;
238 if (hls->flags & HLS_SINGLE_FILE)
241 if (hls->format_options_str) {
242 ret = av_dict_parse_string(&hls->format_options, hls->format_options_str, "=", ":", 0);
244 av_log(s, AV_LOG_ERROR, "Could not parse format options list '%s'\n", hls->format_options_str);
249 for (i = 0; i < s->nb_streams; i++)
251 s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO;
253 if (hls->has_video > 1)
254 av_log(s, AV_LOG_WARNING,
255 "More than a single video stream present, "
256 "expect issues decoding it.\n");
258 hls->oformat = av_guess_format("mpegts", NULL, NULL);
261 ret = AVERROR_MUXER_NOT_FOUND;
265 hls->basename = av_malloc(basename_size);
267 if (!hls->basename) {
268 ret = AVERROR(ENOMEM);
272 strcpy(hls->basename, s->filename);
274 p = strrchr(hls->basename, '.');
279 av_strlcat(hls->basename, pattern, basename_size);
281 if ((ret = hls_mux_init(s)) < 0)
284 if ((ret = hls_start(s)) < 0)
287 av_dict_copy(&options, hls->format_options, 0);
288 ret = avformat_write_header(hls->avf, &options);
289 if (av_dict_count(options)) {
290 av_log(s, AV_LOG_ERROR, "Some of provided format options in '%s' are not recognized\n", hls->format_options_str);
291 ret = AVERROR(EINVAL);
297 av_dict_free(&options);
299 av_free(hls->basename);
301 avformat_free_context(hls->avf);
306 static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
308 HLSContext *hls = s->priv_data;
309 AVFormatContext *oc = hls->avf;
310 AVStream *st = s->streams[pkt->stream_index];
311 int64_t end_pts = hls->recording_time * hls->number;
313 int ret, can_split = 1;
315 if (hls->start_pts == AV_NOPTS_VALUE) {
316 hls->start_pts = pkt->pts;
317 hls->end_pts = pkt->pts;
320 if (hls->has_video) {
321 can_split = st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
322 pkt->flags & AV_PKT_FLAG_KEY;
323 is_ref_pkt = st->codec->codec_type == AVMEDIA_TYPE_VIDEO;
325 if (pkt->pts == AV_NOPTS_VALUE)
326 is_ref_pkt = can_split = 0;
329 hls->duration = (double)(pkt->pts - hls->end_pts)
330 * st->time_base.num / st->time_base.den;
332 if (can_split && av_compare_ts(pkt->pts - hls->start_pts, st->time_base,
333 end_pts, AV_TIME_BASE_Q) >= 0) {
334 int64_t new_start_pos;
335 av_write_frame(oc, NULL); /* Flush any buffered data */
337 new_start_pos = avio_tell(hls->avf->pb);
338 hls->size = new_start_pos - hls->start_pos;
339 ret = hls_append_segment(hls, hls->duration, hls->start_pos, hls->size);
340 hls->start_pos = new_start_pos;
344 hls->end_pts = pkt->pts;
347 if (hls->flags & HLS_SINGLE_FILE) {
348 if (hls->avf->oformat->priv_class && hls->avf->priv_data)
349 av_opt_set(hls->avf->priv_data, "mpegts_flags", "resend_headers", 0);
362 if ((ret = hls_window(s, 0)) < 0)
366 ret = ff_write_chained(oc, pkt->stream_index, pkt, s, 0);
371 static int hls_write_trailer(struct AVFormatContext *s)
373 HLSContext *hls = s->priv_data;
374 AVFormatContext *oc = hls->avf;
376 av_write_trailer(oc);
377 hls->size = avio_tell(hls->avf->pb) - hls->start_pos;
378 avio_closep(&oc->pb);
379 avformat_free_context(oc);
380 av_free(hls->basename);
381 hls_append_segment(hls, hls->duration, hls->start_pos, hls->size);
384 hls_free_segments(hls);
389 #define OFFSET(x) offsetof(HLSContext, x)
390 #define E AV_OPT_FLAG_ENCODING_PARAM
391 static const AVOption options[] = {
392 {"start_number", "set first number in the sequence", OFFSET(start_sequence),AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, E},
393 {"hls_time", "set segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E},
394 {"hls_list_size", "set maximum number of playlist entries", OFFSET(max_nb_segments), AV_OPT_TYPE_INT, {.i64 = 5}, 0, INT_MAX, E},
395 {"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},
396 {"hls_wrap", "set number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E},
397 {"hls_base_url", "url to prepend to each playlist entry", OFFSET(baseurl), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
398 {"hls_flags", "set flags affecting HLS playlist and media file generation", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0 }, 0, UINT_MAX, E, "flags"},
399 {"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"},
404 static const AVClass hls_class = {
405 .class_name = "hls muxer",
406 .item_name = av_default_item_name,
408 .version = LIBAVUTIL_VERSION_INT,
412 AVOutputFormat ff_hls_muxer = {
414 .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
415 .extensions = "m3u8",
416 .priv_data_size = sizeof(HLSContext),
417 .audio_codec = AV_CODEC_ID_AAC,
418 .video_codec = AV_CODEC_ID_H264,
419 .flags = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,
420 .write_header = hls_write_header,
421 .write_packet = hls_write_packet,
422 .write_trailer = hls_write_trailer,
423 .priv_class = &hls_class,