2 * Apple HTTP Live Streaming segmenter
3 * Copyright (c) 2012, Luca Barbato
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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 ListEntry {
36 int64_t duration; // segment duration in AV_TIME_BASE units
37 struct ListEntry *next;
40 typedef struct HLSContext {
41 const AVClass *class; // Class for private options.
44 int64_t start_sequence;
45 AVOutputFormat *oformat;
47 float time; // Set by a private option.
48 int size; // Set by a private option.
49 int wrap; // Set by a private option.
50 int version; // Set by a private option.
52 int64_t recording_time;
54 // The following timestamps are in AV_TIME_BASE units.
57 int64_t duration; // last segment duration computed so far.
65 static int hls_mux_init(AVFormatContext *s)
67 HLSContext *hls = s->priv_data;
71 hls->avf = oc = avformat_alloc_context();
73 return AVERROR(ENOMEM);
75 oc->oformat = hls->oformat;
76 oc->interrupt_callback = s->interrupt_callback;
77 oc->opaque = s->opaque;
78 oc->io_open = s->io_open;
79 oc->io_close = s->io_close;
81 for (i = 0; i < s->nb_streams; i++) {
83 if (!(st = avformat_new_stream(oc, NULL)))
84 return AVERROR(ENOMEM);
85 avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
86 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
87 st->time_base = s->streams[i]->time_base;
93 static int append_entry(HLSContext *hls, int64_t duration)
95 ListEntry *en = av_malloc(sizeof(*en));
98 return AVERROR(ENOMEM);
100 av_strlcpy(en->name, av_basename(hls->avf->filename), sizeof(en->name));
102 en->duration = duration;
108 hls->end_list->next = en;
112 if (hls->nb_entries >= hls->size) {
114 hls->list = en->next;
124 static void free_entries(HLSContext *hls)
126 ListEntry *p = hls->list, *en;
135 static int hls_window(AVFormatContext *s, int last)
137 HLSContext *hls = s->priv_data;
139 int64_t target_duration = 0;
141 AVIOContext *out = NULL;
142 char temp_filename[1024];
143 int64_t sequence = FFMAX(hls->start_sequence, hls->sequence - hls->size);
145 snprintf(temp_filename, sizeof(temp_filename), "%s.tmp", s->filename);
146 if ((ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, NULL)) < 0)
149 for (en = hls->list; en; en = en->next) {
150 if (target_duration < en->duration)
151 target_duration = en->duration;
154 avio_printf(out, "#EXTM3U\n");
155 avio_printf(out, "#EXT-X-VERSION:%d\n", hls->version);
156 if (hls->allowcache == 0 || hls->allowcache == 1) {
157 avio_printf(out, "#EXT-X-ALLOW-CACHE:%s\n", hls->allowcache == 0 ? "NO" : "YES");
159 avio_printf(out, "#EXT-X-TARGETDURATION:%"PRId64"\n",
160 av_rescale_rnd(target_duration, 1, AV_TIME_BASE,
162 avio_printf(out, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
164 av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n",
167 for (en = hls->list; en; en = en->next) {
168 if (hls->version > 2)
169 avio_printf(out, "#EXTINF:%f\n",
170 (double)en->duration / AV_TIME_BASE);
172 avio_printf(out, "#EXTINF:%"PRId64",\n",
173 av_rescale(en->duration, 1, AV_TIME_BASE));
175 avio_printf(out, "%s", hls->baseurl);
176 avio_printf(out, "%s\n", en->name);
180 avio_printf(out, "#EXT-X-ENDLIST\n");
183 ff_format_io_close(s, &out);
185 ff_rename(temp_filename, s->filename);
189 static int hls_start(AVFormatContext *s)
191 HLSContext *c = s->priv_data;
192 AVFormatContext *oc = c->avf;
195 if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
196 c->basename, c->wrap ? c->sequence % c->wrap : c->sequence) < 0)
197 return AVERROR(EINVAL);
200 if ((err = s->io_open(s, &oc->pb, oc->filename, AVIO_FLAG_WRITE, NULL)) < 0)
203 if (oc->oformat->priv_class && oc->priv_data)
204 av_opt_set(oc->priv_data, "mpegts_flags", "resend_headers", 0);
209 static int hls_write_header(AVFormatContext *s)
211 HLSContext *hls = s->priv_data;
214 const char *pattern = "%d.ts";
215 int basename_size = strlen(s->filename) + strlen(pattern) + 1;
217 hls->sequence = hls->start_sequence;
218 hls->recording_time = hls->time * AV_TIME_BASE;
219 hls->start_pts = AV_NOPTS_VALUE;
221 for (i = 0; i < s->nb_streams; i++)
223 s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO;
225 if (hls->has_video > 1)
226 av_log(s, AV_LOG_WARNING,
227 "More than a single video stream present, "
228 "expect issues decoding it.\n");
230 hls->oformat = av_guess_format("mpegts", NULL, NULL);
233 ret = AVERROR_MUXER_NOT_FOUND;
237 hls->basename = av_malloc(basename_size);
239 if (!hls->basename) {
240 ret = AVERROR(ENOMEM);
244 strcpy(hls->basename, s->filename);
246 p = strrchr(hls->basename, '.');
251 av_strlcat(hls->basename, pattern, basename_size);
253 if ((ret = hls_mux_init(s)) < 0)
256 if ((ret = hls_start(s)) < 0)
259 if ((ret = avformat_write_header(hls->avf, NULL)) < 0)
265 av_free(hls->basename);
267 avformat_free_context(hls->avf);
272 static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
274 HLSContext *hls = s->priv_data;
275 AVFormatContext *oc = hls->avf;
276 AVStream *st = s->streams[pkt->stream_index];
277 int64_t end_pts = hls->recording_time * hls->number;
278 int64_t pts = av_rescale_q(pkt->pts, st->time_base, AV_TIME_BASE_Q);
279 int ret, can_split = 1;
281 if (hls->start_pts == AV_NOPTS_VALUE) {
282 hls->start_pts = pts;
286 if (hls->has_video) {
287 can_split = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
288 pkt->flags & AV_PKT_FLAG_KEY;
290 if (pkt->pts == AV_NOPTS_VALUE)
293 hls->duration = pts - hls->end_pts;
295 if (can_split && pts - hls->start_pts >= end_pts) {
296 ret = append_entry(hls, hls->duration);
303 av_write_frame(oc, NULL); /* Flush any buffered data */
304 ff_format_io_close(s, &oc->pb);
313 if ((ret = hls_window(s, 0)) < 0)
317 ret = ff_write_chained(oc, pkt->stream_index, pkt, s);
322 static int hls_write_trailer(struct AVFormatContext *s)
324 HLSContext *hls = s->priv_data;
325 AVFormatContext *oc = hls->avf;
327 av_write_trailer(oc);
328 ff_format_io_close(s, &oc->pb);
329 avformat_free_context(oc);
330 av_free(hls->basename);
331 append_entry(hls, hls->duration);
338 #define OFFSET(x) offsetof(HLSContext, x)
339 #define E AV_OPT_FLAG_ENCODING_PARAM
340 static const AVOption options[] = {
341 {"start_number", "first number in the sequence", OFFSET(start_sequence),AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, E},
342 {"hls_time", "segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E},
343 {"hls_list_size", "maximum number of playlist entries", OFFSET(size), AV_OPT_TYPE_INT, {.i64 = 5}, 0, INT_MAX, E},
344 {"hls_wrap", "number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E},
345 {"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},
346 {"hls_base_url", "url to prepend to each playlist entry", OFFSET(baseurl), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
347 {"hls_version", "protocol version", OFFSET(version), AV_OPT_TYPE_INT, {.i64 = 3}, 2, 3, E},
351 static const AVClass hls_class = {
352 .class_name = "hls muxer",
353 .item_name = av_default_item_name,
355 .version = LIBAVUTIL_VERSION_INT,
359 AVOutputFormat ff_hls_muxer = {
361 .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
362 .extensions = "m3u8",
363 .priv_data_size = sizeof(HLSContext),
364 .audio_codec = AV_CODEC_ID_AAC,
365 .video_codec = AV_CODEC_ID_H264,
366 .flags = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,
367 .write_header = hls_write_header,
368 .write_packet = hls_write_packet,
369 .write_trailer = hls_write_trailer,
370 .priv_class = &hls_class,