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https://github.com/FFmpeg/FFmpeg.git
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hlsenc: stand alone hls segmenter
Simplifies usage but has higher latency.
This commit is contained in:
Luca Barbato
parent
b9629acb6b
commit
22a0827dff
@ -90,6 +90,27 @@ avconv -i INPUT -c:a pcm_u8 -c:v mpeg2video -f framecrc -
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See also the @ref{crc} muxer.
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@anchor{hls}
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@section hls
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Apple HTTP Live Streaming muxer that segments MPEG-TS according to
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the HTTP Live Streaming specification.
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It creates a playlist file and numbered segment files. The output
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filename specifies the playlist filename; the segment filenames
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receive the same basename as the playlist, a sequential number and
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a .ts extension.
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@example
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avconv -i in.nut out.m3u8
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@end example
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@table @option
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@item -hls_time segment length in seconds
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@item -hls_list_size maximum number of playlist entries
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@item -hls_wrap number after which index wraps
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@end table
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@anchor{image2}
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@section image2
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@ -111,6 +111,7 @@ OBJS-$(CONFIG_H263_MUXER) += rawenc.o
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OBJS-$(CONFIG_H264_DEMUXER) += h264dec.o rawdec.o
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OBJS-$(CONFIG_H264_MUXER) += rawenc.o
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OBJS-$(CONFIG_HLS_DEMUXER) += hls.o
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OBJS-$(CONFIG_HLS_MUXER) += hlsenc.o mpegtsenc.o
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OBJS-$(CONFIG_IDCIN_DEMUXER) += idcin.o
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OBJS-$(CONFIG_IFF_DEMUXER) += iff.o
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OBJS-$(CONFIG_ILBC_DEMUXER) += ilbc.o
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@ -106,7 +106,7 @@ void av_register_all(void)
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REGISTER_MUXDEMUX (H261, h261);
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REGISTER_MUXDEMUX (H263, h263);
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REGISTER_MUXDEMUX (H264, h264);
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REGISTER_DEMUXER (HLS, hls);
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REGISTER_MUXDEMUX (HLS, hls);
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REGISTER_DEMUXER (IDCIN, idcin);
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REGISTER_DEMUXER (IFF, iff);
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REGISTER_MUXDEMUX (ILBC, ilbc);
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324
libavformat/hlsenc.c
Normal file
324
libavformat/hlsenc.c
Normal file
@ -0,0 +1,324 @@
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/*
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* Apple HTTP Live Streaming segmenter
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* Copyright (c) 2012, Luca Barbato
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <float.h>
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#include "libavutil/mathematics.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/avstring.h"
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#include "libavutil/opt.h"
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#include "libavutil/log.h"
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#include "avformat.h"
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#include "internal.h"
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typedef struct ListEntry {
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char name[1024];
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int duration;
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struct ListEntry *next;
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} ListEntry;
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typedef struct HLSContext {
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const AVClass *class; // Class for private options.
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int number;
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AVOutputFormat *oformat;
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AVFormatContext *avf;
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float time; // Set by a private option.
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int size; // Set by a private option.
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int wrap; // Set by a private option.
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int64_t recording_time;
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int has_video;
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int64_t start_pts;
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int64_t end_pts;
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ListEntry *list;
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ListEntry *end_list;
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char *basename;
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AVIOContext *pb;
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} HLSContext;
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static int hls_mux_init(AVFormatContext *s)
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{
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HLSContext *hls = s->priv_data;
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AVFormatContext *oc;
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int i;
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hls->avf = oc = avformat_alloc_context();
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if (!oc)
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return AVERROR(ENOMEM);
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oc->oformat = hls->oformat;
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oc->interrupt_callback = s->interrupt_callback;
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for (i = 0; i < s->nb_streams; i++) {
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AVStream *st;
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if (!(st = avformat_new_stream(oc, NULL)))
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return AVERROR(ENOMEM);
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avcodec_copy_context(st->codec, s->streams[i]->codec);
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st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
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}
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return 0;
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}
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static int append_entry(HLSContext *hls, uint64_t duration)
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{
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ListEntry *en = av_malloc(sizeof(*en));
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if (!en)
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return AVERROR(ENOMEM);
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av_get_frame_filename(en->name, sizeof(en->name), hls->basename,
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hls->number -1);
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en->duration = duration;
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en->next = NULL;
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if (!hls->list)
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hls->list = en;
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else
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hls->end_list->next = en;
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hls->end_list = en;
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if (hls->number >= hls->size) {
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en = hls->list;
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hls->list = en->next;
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av_free(en);
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}
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return 0;
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}
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static void free_entries(HLSContext *hls)
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{
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ListEntry *p = hls->list, *en;
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while(p) {
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en = p;
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p = p->next;
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av_free(en);
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}
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}
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static int hls_window(AVFormatContext *s, int last)
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{
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HLSContext *hls = s->priv_data;
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ListEntry *en;
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int ret = 0;
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if ((ret = avio_open2(&hls->pb, s->filename, AVIO_FLAG_WRITE,
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&s->interrupt_callback, NULL)) < 0)
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goto fail;
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avio_printf(hls->pb, "#EXTM3U\n");
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avio_printf(hls->pb, "#EXT-X-VERSION:3\n");
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avio_printf(hls->pb, "#EXT-X-TARGETDURATION:%d\n", (int)hls->time);
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avio_printf(hls->pb, "#EXT-X-MEDIA-SEQUENCE:%d\n",
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FFMAX(0, hls->number - hls->size));
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for (en = hls->list; en; en = en->next) {
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avio_printf(hls->pb, "#EXTINF:%d,\n", en->duration);
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avio_printf(hls->pb, "%s\n", en->name);
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}
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if (last)
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avio_printf(hls->pb, "#EXT-X-ENDLIST\n");
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fail:
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avio_closep(&hls->pb);
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return ret;
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}
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static int hls_start(AVFormatContext *s)
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{
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HLSContext *c = s->priv_data;
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AVFormatContext *oc = c->avf;
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int err = 0;
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if (c->wrap)
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c->number %= c->wrap;
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if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
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c->basename, c->number++) < 0)
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return AVERROR(EINVAL);
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if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
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&s->interrupt_callback, NULL)) < 0)
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return err;
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if (oc->oformat->priv_class && oc->priv_data)
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av_opt_set(oc->priv_data, "mpegts_flags", "resend_headers", 0);
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return 0;
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}
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static int hls_write_header(AVFormatContext *s)
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{
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HLSContext *hls = s->priv_data;
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int ret, i;
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char *p;
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const char *pattern = "%d.ts";
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int basename_size = strlen(s->filename) + strlen(pattern);
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hls->number = 0;
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hls->recording_time = hls->time * 1000000;
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hls->start_pts = AV_NOPTS_VALUE;
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for (i = 0; i < s->nb_streams; i++)
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hls->has_video +=
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s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO;
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if (hls->has_video > 1)
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av_log(s, AV_LOG_WARNING,
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"More than a single video stream present, "
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"expect issues decoding it.\n");
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hls->oformat = av_guess_format("mpegts", NULL, NULL);
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if (!hls->oformat) {
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ret = AVERROR_MUXER_NOT_FOUND;
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goto fail;
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}
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hls->basename = av_malloc(basename_size);
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if (!hls->basename) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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strcpy(hls->basename, s->filename);
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p = strrchr(hls->basename, '.');
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if (p)
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*p = '\0';
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av_strlcat(hls->basename, "%d.ts", basename_size);
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if ((ret = hls_mux_init(s)) < 0)
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goto fail;
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if ((ret = hls_start(s)) < 0)
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goto fail;
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if ((ret = avformat_write_header(hls->avf, NULL)) < 0)
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return ret;
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fail:
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if (ret) {
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av_free(hls->basename);
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if (hls->avf)
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avformat_free_context(hls->avf);
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}
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return ret;
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}
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static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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HLSContext *hls = s->priv_data;
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AVFormatContext *oc = hls->avf;
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AVStream *st = s->streams[pkt->stream_index];
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int64_t end_pts = hls->recording_time * hls->number;
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int ret;
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if (hls->start_pts == AV_NOPTS_VALUE) {
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hls->start_pts = pkt->pts;
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hls->end_pts = pkt->pts;
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}
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end_pts += hls->start_pts;
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if ((hls->has_video && st->codec->codec_type == AVMEDIA_TYPE_VIDEO) &&
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av_compare_ts(pkt->pts, st->time_base, end_pts, AV_TIME_BASE_Q) >= 0 &&
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pkt->flags & AV_PKT_FLAG_KEY) {
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append_entry(hls, av_rescale(pkt->pts - hls->end_pts,
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st->time_base.num,
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st->time_base.den));
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hls->end_pts = pkt->pts;
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av_write_frame(oc, NULL); /* Flush any buffered data */
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avio_close(oc->pb);
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ret = hls_start(s);
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if (ret)
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return ret;
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oc = hls->avf;
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if ((ret = hls_window(s, 0)) < 0)
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return ret;
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}
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ret = ff_write_chained(oc, pkt->stream_index, pkt, s);
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return ret;
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}
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static int hls_write_trailer(struct AVFormatContext *s)
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{
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HLSContext *hls = s->priv_data;
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AVFormatContext *oc = hls->avf;
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av_write_trailer(oc);
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avio_closep(&oc->pb);
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avformat_free_context(oc);
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av_free(hls->basename);
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hls_window(s, 1);
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free_entries(hls);
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avio_close(hls->pb);
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return 0;
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}
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#define OFFSET(x) offsetof(HLSContext, x)
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#define E AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{"hls_time", "segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E},
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{"hls_list_size", "maximum number of playlist entries", OFFSET(size), AV_OPT_TYPE_INT, {.i64 = 5}, 0, INT_MAX, E},
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{"hls_wrap", "number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E},
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{ NULL },
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};
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static const AVClass hls_class = {
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.class_name = "hls muxer",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVOutputFormat ff_hls_muxer = {
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.name = "hls",
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.long_name = NULL_IF_CONFIG_SMALL("hls"),
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.extensions = "m3u8",
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.priv_data_size = sizeof(HLSContext),
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.audio_codec = AV_CODEC_ID_MP2,
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.video_codec = AV_CODEC_ID_MPEG2VIDEO,
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.flags = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,
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.write_header = hls_write_header,
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.write_packet = hls_write_packet,
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.write_trailer = hls_write_trailer,
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.priv_class = &hls_class,
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};
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