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
24 #include "libavutil/mathematics.h"
25 #include "libavutil/parseutils.h"
26 #include "libavutil/avstring.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/log.h"
33 typedef struct ListEntry {
36 struct ListEntry *next;
39 typedef struct HLSContext {
40 const AVClass *class; // Class for private options.
43 AVOutputFormat *oformat;
45 float time; // Set by a private option.
46 int size; // Set by a private option.
47 int wrap; // Set by a private option.
48 int64_t recording_time;
52 int64_t duration; // last segment duration computed so far, in seconds
60 static int hls_mux_init(AVFormatContext *s)
62 HLSContext *hls = s->priv_data;
66 hls->avf = oc = avformat_alloc_context();
68 return AVERROR(ENOMEM);
70 oc->oformat = hls->oformat;
71 oc->interrupt_callback = s->interrupt_callback;
73 for (i = 0; i < s->nb_streams; i++) {
75 if (!(st = avformat_new_stream(oc, NULL)))
76 return AVERROR(ENOMEM);
77 avcodec_copy_context(st->codec, s->streams[i]->codec);
78 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
84 static int append_entry(HLSContext *hls, uint64_t duration)
86 ListEntry *en = av_malloc(sizeof(*en));
89 return AVERROR(ENOMEM);
91 av_strlcpy(en->name, av_basename(hls->avf->filename), sizeof(en->name));
93 en->duration = duration;
99 hls->end_list->next = en;
103 if (hls->nb_entries >= hls->size) {
105 hls->list = en->next;
115 static void free_entries(HLSContext *hls)
117 ListEntry *p = hls->list, *en;
126 static int hls_window(AVFormatContext *s, int last)
128 HLSContext *hls = s->priv_data;
130 int target_duration = 0;
133 if ((ret = avio_open2(&hls->pb, s->filename, AVIO_FLAG_WRITE,
134 &s->interrupt_callback, NULL)) < 0)
137 for (en = hls->list; en; en = en->next) {
138 if (target_duration < en->duration)
139 target_duration = en->duration;
142 avio_printf(hls->pb, "#EXTM3U\n");
143 avio_printf(hls->pb, "#EXT-X-VERSION:3\n");
144 avio_printf(hls->pb, "#EXT-X-TARGETDURATION:%d\n", target_duration);
145 avio_printf(hls->pb, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n",
146 FFMAX(0, hls->sequence - hls->size));
148 for (en = hls->list; en; en = en->next) {
149 avio_printf(hls->pb, "#EXTINF:%d,\n", en->duration);
150 avio_printf(hls->pb, "%s\n", en->name);
154 avio_printf(hls->pb, "#EXT-X-ENDLIST\n");
157 avio_closep(&hls->pb);
161 static int hls_start(AVFormatContext *s)
163 HLSContext *c = s->priv_data;
164 AVFormatContext *oc = c->avf;
167 if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
168 c->basename, c->wrap ? c->number % c->wrap : c->number) < 0) {
169 av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", c->basename);
170 return AVERROR(EINVAL);
174 if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
175 &s->interrupt_callback, NULL)) < 0)
178 if (oc->oformat->priv_class && oc->priv_data)
179 av_opt_set(oc->priv_data, "mpegts_flags", "resend_headers", 0);
184 static int hls_write_header(AVFormatContext *s)
186 HLSContext *hls = s->priv_data;
189 const char *pattern = "%d.ts";
190 int basename_size = strlen(s->filename) + strlen(pattern) + 1;
194 hls->recording_time = hls->time * AV_TIME_BASE;
195 hls->start_pts = AV_NOPTS_VALUE;
197 for (i = 0; i < s->nb_streams; i++)
199 s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO;
201 if (hls->has_video > 1)
202 av_log(s, AV_LOG_WARNING,
203 "More than a single video stream present, "
204 "expect issues decoding it.\n");
206 hls->oformat = av_guess_format("mpegts", NULL, NULL);
209 ret = AVERROR_MUXER_NOT_FOUND;
213 hls->basename = av_malloc(basename_size);
215 if (!hls->basename) {
216 ret = AVERROR(ENOMEM);
220 strcpy(hls->basename, s->filename);
222 p = strrchr(hls->basename, '.');
227 av_strlcat(hls->basename, pattern, basename_size);
229 if ((ret = hls_mux_init(s)) < 0)
232 if ((ret = hls_start(s)) < 0)
235 if ((ret = avformat_write_header(hls->avf, NULL)) < 0)
241 av_free(hls->basename);
243 avformat_free_context(hls->avf);
248 static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
250 HLSContext *hls = s->priv_data;
251 AVFormatContext *oc = hls->avf;
252 AVStream *st = s->streams[pkt->stream_index];
253 int64_t end_pts = hls->recording_time * hls->number;
255 int ret, can_split = 1;
257 if (hls->start_pts == AV_NOPTS_VALUE) {
258 hls->start_pts = pkt->pts;
259 hls->end_pts = pkt->pts;
262 if (hls->has_video) {
263 can_split = st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
264 pkt->flags & AV_PKT_FLAG_KEY;
265 is_ref_pkt = st->codec->codec_type == AVMEDIA_TYPE_VIDEO;
267 if (pkt->pts == AV_NOPTS_VALUE)
268 is_ref_pkt = can_split = 0;
271 hls->duration = av_rescale(pkt->pts - hls->end_pts,
272 st->time_base.num, st->time_base.den);
274 if (can_split && av_compare_ts(pkt->pts - hls->start_pts, st->time_base,
275 end_pts, AV_TIME_BASE_Q) >= 0) {
276 ret = append_entry(hls, hls->duration);
280 hls->end_pts = pkt->pts;
283 av_write_frame(oc, NULL); /* Flush any buffered data */
293 if ((ret = hls_window(s, 0)) < 0)
297 ret = ff_write_chained(oc, pkt->stream_index, pkt, s);
302 static int hls_write_trailer(struct AVFormatContext *s)
304 HLSContext *hls = s->priv_data;
305 AVFormatContext *oc = hls->avf;
307 av_write_trailer(oc);
308 avio_closep(&oc->pb);
309 avformat_free_context(oc);
310 av_free(hls->basename);
311 append_entry(hls, hls->duration);
319 #define OFFSET(x) offsetof(HLSContext, x)
320 #define E AV_OPT_FLAG_ENCODING_PARAM
321 static const AVOption options[] = {
322 {"start_number", "set first number in the sequence", OFFSET(sequence),AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, E},
323 {"hls_time", "set segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E},
324 {"hls_list_size", "set maximum number of playlist entries", OFFSET(size), AV_OPT_TYPE_INT, {.i64 = 5}, 0, INT_MAX, E},
325 {"hls_wrap", "set number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E},
329 static const AVClass hls_class = {
330 .class_name = "hls muxer",
331 .item_name = av_default_item_name,
333 .version = LIBAVUTIL_VERSION_INT,
337 AVOutputFormat ff_hls_muxer = {
339 .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
340 .extensions = "m3u8",
341 .priv_data_size = sizeof(HLSContext),
342 .audio_codec = AV_CODEC_ID_MP2,
343 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
344 .flags = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,
345 .write_header = hls_write_header,
346 .write_packet = hls_write_packet,
347 .write_trailer = hls_write_trailer,
348 .priv_class = &hls_class,