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ffmpeg/libavformat/hlsenc.c

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/*
* Apple HTTP Live Streaming segmenter
* Copyright (c) 2012, Luca Barbato
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <float.h>
#include "libavutil/mathematics.h"
#include "libavutil/parseutils.h"
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "libavutil/log.h"
#include "avformat.h"
#include "internal.h"
typedef struct ListEntry {
char name[1024];
int duration;
struct ListEntry *next;
} ListEntry;
typedef struct HLSContext {
const AVClass *class; // Class for private options.
unsigned number;
int64_t sequence;
AVOutputFormat *oformat;
AVFormatContext *avf;
float time; // Set by a private option.
int size; // Set by a private option.
int wrap; // Set by a private option.
int64_t recording_time;
int has_video;
int64_t start_pts;
int64_t end_pts;
int64_t duration; // last segment duration computed so far, in seconds
int nb_entries;
ListEntry *list;
ListEntry *end_list;
char *basename;
AVIOContext *pb;
} HLSContext;
static int hls_mux_init(AVFormatContext *s)
{
HLSContext *hls = s->priv_data;
AVFormatContext *oc;
int i;
hls->avf = oc = avformat_alloc_context();
if (!oc)
return AVERROR(ENOMEM);
oc->oformat = hls->oformat;
oc->interrupt_callback = s->interrupt_callback;
for (i = 0; i < s->nb_streams; i++) {
AVStream *st;
if (!(st = avformat_new_stream(oc, NULL)))
return AVERROR(ENOMEM);
avcodec_copy_context(st->codec, s->streams[i]->codec);
st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
}
return 0;
}
static int append_entry(HLSContext *hls, uint64_t duration)
{
ListEntry *en = av_malloc(sizeof(*en));
if (!en)
return AVERROR(ENOMEM);
av_strlcpy(en->name, av_basename(hls->avf->filename), sizeof(en->name));
en->duration = duration;
en->next = NULL;
if (!hls->list)
hls->list = en;
else
hls->end_list->next = en;
hls->end_list = en;
if (hls->nb_entries >= hls->size) {
en = hls->list;
hls->list = en->next;
av_free(en);
} else
hls->nb_entries++;
hls->sequence++;
return 0;
}
static void free_entries(HLSContext *hls)
{
ListEntry *p = hls->list, *en;
while(p) {
en = p;
p = p->next;
av_free(en);
}
}
static int hls_window(AVFormatContext *s, int last)
{
HLSContext *hls = s->priv_data;
ListEntry *en;
int target_duration = 0;
int ret = 0;
if ((ret = avio_open2(&hls->pb, s->filename, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL)) < 0)
goto fail;
for (en = hls->list; en; en = en->next) {
if (target_duration < en->duration)
target_duration = en->duration;
}
avio_printf(hls->pb, "#EXTM3U\n");
avio_printf(hls->pb, "#EXT-X-VERSION:3\n");
avio_printf(hls->pb, "#EXT-X-TARGETDURATION:%d\n", target_duration);
avio_printf(hls->pb, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n",
FFMAX(0, hls->sequence - hls->size));
for (en = hls->list; en; en = en->next) {
avio_printf(hls->pb, "#EXTINF:%d,\n", en->duration);
avio_printf(hls->pb, "%s\n", en->name);
}
if (last)
avio_printf(hls->pb, "#EXT-X-ENDLIST\n");
fail:
avio_closep(&hls->pb);
return ret;
}
static int hls_start(AVFormatContext *s)
{
HLSContext *c = s->priv_data;
AVFormatContext *oc = c->avf;
int err = 0;
if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
c->basename, c->wrap ? c->number % c->wrap : c->number) < 0)
return AVERROR(EINVAL);
c->number++;
if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL)) < 0)
return err;
if (oc->oformat->priv_class && oc->priv_data)
av_opt_set(oc->priv_data, "mpegts_flags", "resend_headers", 0);
return 0;
}
static int hls_write_header(AVFormatContext *s)
{
HLSContext *hls = s->priv_data;
int ret, i;
char *p;
const char *pattern = "%d.ts";
int basename_size = strlen(s->filename) + strlen(pattern) + 1;
hls->number = 0;
hls->recording_time = hls->time * AV_TIME_BASE;
hls->start_pts = AV_NOPTS_VALUE;
for (i = 0; i < s->nb_streams; i++)
hls->has_video +=
s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO;
if (hls->has_video > 1)
av_log(s, AV_LOG_WARNING,
"More than a single video stream present, "
"expect issues decoding it.\n");
hls->oformat = av_guess_format("mpegts", NULL, NULL);
if (!hls->oformat) {
ret = AVERROR_MUXER_NOT_FOUND;
goto fail;
}
hls->basename = av_malloc(basename_size);
if (!hls->basename) {
ret = AVERROR(ENOMEM);
goto fail;
}
strcpy(hls->basename, s->filename);
p = strrchr(hls->basename, '.');
if (p)
*p = '\0';
av_strlcat(hls->basename, pattern, basename_size);
if ((ret = hls_mux_init(s)) < 0)
goto fail;
if ((ret = hls_start(s)) < 0)
goto fail;
if ((ret = avformat_write_header(hls->avf, NULL)) < 0)
return ret;
fail:
if (ret) {
av_free(hls->basename);
if (hls->avf)
avformat_free_context(hls->avf);
}
return ret;
}
static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
{
HLSContext *hls = s->priv_data;
AVFormatContext *oc = hls->avf;
AVStream *st = s->streams[pkt->stream_index];
int64_t end_pts = hls->recording_time * hls->number;
int ret, can_split = 1;
if (hls->start_pts == AV_NOPTS_VALUE) {
hls->start_pts = pkt->pts;
hls->end_pts = pkt->pts;
}
if (hls->has_video) {
can_split = st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
pkt->flags & AV_PKT_FLAG_KEY;
}
if (pkt->pts == AV_NOPTS_VALUE)
can_split = 0;
else
hls->duration = av_rescale(pkt->pts - hls->end_pts,
st->time_base.num, st->time_base.den);
if (can_split && av_compare_ts(pkt->pts - hls->start_pts, st->time_base,
end_pts, AV_TIME_BASE_Q) >= 0) {
ret = append_entry(hls, hls->duration);
if (ret)
return ret;
hls->end_pts = pkt->pts;
hls->duration = 0;
av_write_frame(oc, NULL); /* Flush any buffered data */
avio_close(oc->pb);
ret = hls_start(s);
if (ret)
return ret;
oc = hls->avf;
if ((ret = hls_window(s, 0)) < 0)
return ret;
}
ret = ff_write_chained(oc, pkt->stream_index, pkt, s);
return ret;
}
static int hls_write_trailer(struct AVFormatContext *s)
{
HLSContext *hls = s->priv_data;
AVFormatContext *oc = hls->avf;
av_write_trailer(oc);
avio_closep(&oc->pb);
avformat_free_context(oc);
av_free(hls->basename);
append_entry(hls, hls->duration);
hls_window(s, 1);
free_entries(hls);
avio_close(hls->pb);
return 0;
}
#define OFFSET(x) offsetof(HLSContext, x)
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{"start_number", "first number in the sequence", OFFSET(sequence),AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, E},
{"hls_time", "segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E},
{"hls_list_size", "maximum number of playlist entries", OFFSET(size), AV_OPT_TYPE_INT, {.i64 = 5}, 0, INT_MAX, E},
{"hls_wrap", "number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E},
{ NULL },
};
static const AVClass hls_class = {
.class_name = "hls muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVOutputFormat ff_hls_muxer = {
.name = "hls",
.long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
.extensions = "m3u8",
.priv_data_size = sizeof(HLSContext),
.audio_codec = AV_CODEC_ID_MP2,
.video_codec = AV_CODEC_ID_MPEG2VIDEO,
.flags = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,
.write_header = hls_write_header,
.write_packet = hls_write_packet,
.write_trailer = hls_write_trailer,
.priv_class = &hls_class,
};
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