[FFmpeg-cvslog] hlsenc: stand alone hls segmenter
Luca Barbato
git at videolan.org
Wed Nov 14 12:11:16 CET 2012
ffmpeg | branch: master | Luca Barbato <lu_zero at gentoo.org> | Fri Oct 26 16:36:56 2012 +0200| [22a0827dff29a94e7fd07ad2782f169b2703c70d] | committer: Luca Barbato
hlsenc: stand alone hls segmenter
Simplifies usage but has higher latency.
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=22a0827dff29a94e7fd07ad2782f169b2703c70d
---
doc/muxers.texi | 21 +++
libavformat/Makefile | 1 +
libavformat/allformats.c | 2 +-
libavformat/hlsenc.c | 324 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 347 insertions(+), 1 deletion(-)
diff --git a/doc/muxers.texi b/doc/muxers.texi
index 4bb6d56..570041d 100644
--- a/doc/muxers.texi
+++ b/doc/muxers.texi
@@ -90,6 +90,27 @@ avconv -i INPUT -c:a pcm_u8 -c:v mpeg2video -f framecrc -
See also the @ref{crc} muxer.
+ at anchor{hls}
+ at section hls
+
+Apple HTTP Live Streaming muxer that segments MPEG-TS according to
+the HTTP Live Streaming specification.
+
+It creates a playlist file and numbered segment files. The output
+filename specifies the playlist filename; the segment filenames
+receive the same basename as the playlist, a sequential number and
+a .ts extension.
+
+ at example
+avconv -i in.nut out.m3u8
+ at end example
+
+ at table @option
+ at item -hls_time segment length in seconds
+ at item -hls_list_size maximum number of playlist entries
+ at item -hls_wrap number after which index wraps
+ at end table
+
@anchor{image2}
@section image2
diff --git a/libavformat/Makefile b/libavformat/Makefile
index ed030bd..c589316 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -111,6 +111,7 @@ OBJS-$(CONFIG_H263_MUXER) += rawenc.o
OBJS-$(CONFIG_H264_DEMUXER) += h264dec.o rawdec.o
OBJS-$(CONFIG_H264_MUXER) += rawenc.o
OBJS-$(CONFIG_HLS_DEMUXER) += hls.o
+OBJS-$(CONFIG_HLS_MUXER) += hlsenc.o mpegtsenc.o
OBJS-$(CONFIG_IDCIN_DEMUXER) += idcin.o
OBJS-$(CONFIG_IFF_DEMUXER) += iff.o
OBJS-$(CONFIG_ILBC_DEMUXER) += ilbc.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 39daec7..c7c4be9 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -106,7 +106,7 @@ void av_register_all(void)
REGISTER_MUXDEMUX (H261, h261);
REGISTER_MUXDEMUX (H263, h263);
REGISTER_MUXDEMUX (H264, h264);
- REGISTER_DEMUXER (HLS, hls);
+ REGISTER_MUXDEMUX (HLS, hls);
REGISTER_DEMUXER (IDCIN, idcin);
REGISTER_DEMUXER (IFF, iff);
REGISTER_MUXDEMUX (ILBC, ilbc);
diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
new file mode 100644
index 0000000..88f47e0
--- /dev/null
+++ b/libavformat/hlsenc.c
@@ -0,0 +1,324 @@
+/*
+ * 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.
+ int number;
+ 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;
+ 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_get_frame_filename(en->name, sizeof(en->name), hls->basename,
+ hls->number -1);
+
+ en->duration = duration;
+ en->next = NULL;
+
+ if (!hls->list)
+ hls->list = en;
+ else
+ hls->end_list->next = en;
+
+ hls->end_list = en;
+
+ if (hls->number >= hls->size) {
+ en = hls->list;
+ hls->list = en->next;
+ av_free(en);
+ }
+
+ 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 ret = 0;
+
+ if ((ret = avio_open2(&hls->pb, s->filename, AVIO_FLAG_WRITE,
+ &s->interrupt_callback, NULL)) < 0)
+ goto fail;
+
+ avio_printf(hls->pb, "#EXTM3U\n");
+ avio_printf(hls->pb, "#EXT-X-VERSION:3\n");
+ avio_printf(hls->pb, "#EXT-X-TARGETDURATION:%d\n", (int)hls->time);
+ avio_printf(hls->pb, "#EXT-X-MEDIA-SEQUENCE:%d\n",
+ FFMAX(0, hls->number - 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 (c->wrap)
+ c->number %= c->wrap;
+
+ if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
+ c->basename, c->number++) < 0)
+ return AVERROR(EINVAL);
+
+ 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);
+
+ hls->number = 0;
+
+ hls->recording_time = hls->time * 1000000;
+ 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, "%d.ts", 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;
+
+ if (hls->start_pts == AV_NOPTS_VALUE) {
+ hls->start_pts = pkt->pts;
+ hls->end_pts = pkt->pts;
+ }
+ end_pts += hls->start_pts;
+
+ if ((hls->has_video && st->codec->codec_type == AVMEDIA_TYPE_VIDEO) &&
+ av_compare_ts(pkt->pts, st->time_base, end_pts, AV_TIME_BASE_Q) >= 0 &&
+ pkt->flags & AV_PKT_FLAG_KEY) {
+
+ append_entry(hls, av_rescale(pkt->pts - hls->end_pts,
+ st->time_base.num,
+ st->time_base.den));
+ hls->end_pts = pkt->pts;
+
+ 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);
+ 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[] = {
+ {"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("hls"),
+ .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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