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lavf: Add support for WebM Live Muxing

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This patch adds support for WebM Live Muxing by adding a new WebM
Chunk muxer. It writes out live WebM Chunks which can be used for
playback using Live DASH Clients.

Please see muxers.texi for sample usage.

Signed-off-by: Vignesh Venkatasubramanian <vigneshv@google.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Vignesh Venkatasubramanian 2015-03-30 14:46:10 -07:00 committed by Michael Niedermayer
parent c4b2017ba6
commit 6fd300ac6c
7 changed files with 320 additions and 6 deletions
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1
Changelog
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@ -14,6 +14,7 @@ version <next>:
- MMAL-accelerated H.264 decoding
- basic APNG encoder and muxer
- unpack DivX-style packed B-frames in MPEG-4 bitstream filter
- WebM Live Chunk Muxer
version 2.6:

43
doc/muxers.texi
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@ -1268,4 +1268,47 @@ ffmpeg -f webm_dash_manifest -i video1.webm \
manifest.xml
@end example
@section webm_chunk
WebM Live Chunk Muxer.
This muxer writes out WebM headers and chunks as separate files which can be
consumed by clients that support WebM Live streams via DASH.
@subsection Options
This muxer supports the following options:
@table @option
@item chunk_start_index
Index of the first chunk (defaults to 0).
@item header
Filename of the header where the initialization data will be written.
@item audio_chunk_duration
Duration of each audio chunk in milliseconds (defaults to 5000).
@end table
@subsection Example
@example
ffmpeg -f v4l2 -i /dev/video0 \
-f alsa -i hw:0 \
-map 0:0 \
-c:v libvpx-vp9 \
-s 640x360 -keyint_min 30 -g 30 \
-f webm_chunk \
-header webm_live_video_360.hdr \
-chunk_start_index 1 \
webm_live_video_360_%d.chk \
-map 1:0 \
-c:a libvorbis \
-b:a 128k \
-f webm_chunk \
-header webm_live_audio_128.hdr \
-chunk_start_index 1 \
-audio_chunk_duration 1000 \
webm_live_audio_128_%d.chk
@end example
@c man end MUXERS

5
libavformat/Makefile
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@ -238,7 +238,7 @@ OBJS-$(CONFIG_MATROSKA_DEMUXER) += matroskadec.o matroska.o \
OBJS-$(CONFIG_MATROSKA_MUXER) += matroskaenc.o matroska.o \
isom.o avc.o hevc.o \
flacenc_header.o avlanguage.o vorbiscomment.o wv.o \
webmdashenc.o
webmdashenc.o webm_chunk.o
OBJS-$(CONFIG_MD5_MUXER) += md5enc.o
OBJS-$(CONFIG_MGSTS_DEMUXER) += mgsts.o
OBJS-$(CONFIG_MICRODVD_DEMUXER) += microdvddec.o subtitles.o
@ -452,12 +452,13 @@ OBJS-$(CONFIG_WEBM_MUXER) += matroskaenc.o matroska.o \
isom.o avc.o hevc.o \
flacenc_header.o avlanguage.o \
wv.o vorbiscomment.o \
webmdashenc.o
webmdashenc.o webm_chunk.o
OBJS-$(CONFIG_WEBM_DASH_MANIFEST_DEMUXER)+= matroskadec.o matroska.o \
isom.o rmsipr.o flac_picture.o \
oggparsevorbis.o vorbiscomment.o \
flac_picture.o replaygain.o
OBJS-$(CONFIG_WEBM_DASH_MANIFEST_MUXER) += webmdashenc.o matroska.o
OBJS-$(CONFIG_WEBM_CHUNK_MUXER) += webm_chunk.o matroska.o
OBJS-$(CONFIG_WEBP_MUXER) += webpenc.o
OBJS-$(CONFIG_WEBVTT_DEMUXER) += webvttdec.o subtitles.o
OBJS-$(CONFIG_WEBVTT_MUXER) += webvttenc.o

1
libavformat/allformats.c
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@ -316,6 +316,7 @@ void av_register_all(void)
REGISTER_DEMUXER (WC3, wc3);
REGISTER_MUXER (WEBM, webm);
REGISTER_MUXDEMUX(WEBM_DASH_MANIFEST, webm_dash_manifest);
REGISTER_MUXER (WEBM_CHUNK, webm_chunk);
REGISTER_MUXER (WEBP, webp);
REGISTER_MUXDEMUX(WEBVTT, webvtt);
REGISTER_DEMUXER (WSAUD, wsaud);

12
libavformat/matroskaenc.c
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@ -120,6 +120,7 @@ typedef struct MatroskaMuxContext {
int64_t cluster_time_limit;
int is_dash;
int dash_track_number;
int is_live;
uint32_t chapter_id_offset;
int wrote_chapters;
@ -1412,7 +1413,9 @@ static int mkv_write_header(AVFormatContext *s)
// reserve space for the duration
mkv->duration = 0;
mkv->duration_offset = avio_tell(pb);
put_ebml_void(pb, 11); // assumes double-precision float to be written
if (!mkv->is_live) {
put_ebml_void(pb, 11); // assumes double-precision float to be written
}
end_ebml_master(pb, segment_info);
ret = mkv_write_tracks(s);
@ -1436,7 +1439,7 @@ static int mkv_write_header(AVFormatContext *s)
return ret;
}
if (!s->pb->seekable)
if (!s->pb->seekable && !mkv->is_live)
mkv_write_seekhead(pb, mkv->main_seekhead);
mkv->cues = mkv_start_cues(mkv->segment_offset);
@ -1955,7 +1958,9 @@ static int mkv_write_trailer(AVFormatContext *s)
avio_seek(pb, currentpos, SEEK_SET);
}
end_ebml_master(pb, mkv->segment);
if (!mkv->is_live) {
end_ebml_master(pb, mkv->segment);
}
av_freep(&mkv->tracks);
av_freep(&mkv->cues->entries);
av_freep(&mkv->cues);
@ -2019,6 +2024,7 @@ static const AVOption options[] = {
{ "cluster_time_limit", "Store at most the provided number of milliseconds in a cluster.", OFFSET(cluster_time_limit), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, FLAGS },
{ "dash", "Create a WebM file conforming to WebM DASH specification", OFFSET(is_dash), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
{ "dash_track_number", "Track number for the DASH stream", OFFSET(dash_track_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 127, FLAGS },
{ "live", "Write files assuming it is a live stream.", OFFSET(is_live), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
{ "allow_raw_vfw", "allow RAW VFW mode", OFFSET(allow_raw_vfw), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
{ NULL },
};

2
libavformat/version.h
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@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFORMAT_VERSION_MAJOR 56
#define LIBAVFORMAT_VERSION_MINOR 29
#define LIBAVFORMAT_VERSION_MINOR 30
#define LIBAVFORMAT_VERSION_MICRO 100
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \

262
libavformat/webm_chunk.c Normal file
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@ -0,0 +1,262 @@
/*
* Copyright (c) 2015, Vignesh Venkatasubramanian
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file WebM Chunk Muxer
* The chunk muxer enables writing WebM Live chunks where there is a header
* chunk, followed by data chunks where each Cluster is written out as a Chunk.
*/
#include <float.h>
#include <time.h>
#include "avformat.h"
#include "avio.h"
#include "internal.h"
#include "libavutil/avassert.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "libavutil/avstring.h"
#include "libavutil/parseutils.h"
#include "libavutil/mathematics.h"
#include "libavutil/time.h"
#include "libavutil/time_internal.h"
#include "libavutil/timestamp.h"
typedef struct WebMChunkContext {
const AVClass *class;
int chunk_start_index;
char *header_filename;
int chunk_duration;
int chunk_count;
int chunk_index;
uint64_t duration_written;
int prev_pts;
AVOutputFormat *oformat;
AVFormatContext *avf;
} WebMChunkContext;
static int chunk_mux_init(AVFormatContext *s)
{
WebMChunkContext *wc = s->priv_data;
AVFormatContext *oc;
int ret;
ret = avformat_alloc_output_context2(&wc->avf, wc->oformat, NULL, NULL);
if (ret < 0)
return ret;
oc = wc->avf;
oc->interrupt_callback = s->interrupt_callback;
oc->max_delay = s->max_delay;
av_dict_copy(&oc->metadata, s->metadata, 0);
oc->priv_data = av_mallocz(oc->oformat->priv_data_size);
if (!oc->priv_data) {
avio_close(oc->pb);
return AVERROR(ENOMEM);
}
*(const AVClass**)oc->priv_data = oc->oformat->priv_class;
av_opt_set_defaults(oc->priv_data);
av_opt_set_int(oc->priv_data, "dash", 1, 0);
av_opt_set_int(oc->priv_data, "cluster_time_limit", wc->chunk_duration, 0);
av_opt_set_int(oc->priv_data, "live", 1, 0);
oc->streams = s->streams;
oc->nb_streams = s->nb_streams;
return 0;
}
static int set_chunk_filename(AVFormatContext *s, int is_header)
{
WebMChunkContext *wc = s->priv_data;
AVFormatContext *oc = wc->avf;
if (is_header) {
if (!wc->header_filename) {
return AVERROR(EINVAL);
}
av_strlcpy(oc->filename, wc->header_filename, strlen(wc->header_filename) + 1);
} else {
if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
s->filename, wc->chunk_index) < 0) {
av_log(oc, AV_LOG_ERROR, "Invalid chunk filename template '%s'\n", s->filename);
return AVERROR(EINVAL);
}
}
return 0;
}
static int webm_chunk_write_header(AVFormatContext *s)
{
WebMChunkContext *wc = s->priv_data;
AVFormatContext *oc = NULL;
int ret;
// DASH Streams can only have either one track per file.
if (s->nb_streams != 1) { return AVERROR_INVALIDDATA; }
wc->chunk_count = 0;
wc->chunk_index = wc->chunk_start_index;
wc->oformat = av_guess_format("webm", s->filename, "video/webm");
if (!wc->oformat)
return AVERROR_MUXER_NOT_FOUND;
ret = chunk_mux_init(s);
if (ret < 0)
return ret;
oc = wc->avf;
ret = set_chunk_filename(s, 1);
if (ret< 0)
return ret;
ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL);
if (ret < 0)
return ret;
oc->pb->seekable = 0;
ret = oc->oformat->write_header(oc);
if (ret < 0)
return ret;
avio_close(oc->pb);
return 0;
}
static int chunk_start(AVFormatContext *s)
{
WebMChunkContext *wc = s->priv_data;
AVFormatContext *oc = wc->avf;
int ret;
ret = set_chunk_filename(s, 0);
if (ret < 0)
return ret;
wc->chunk_index++;
ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL);
if (ret < 0)
return ret;
oc->pb->seekable = 0;
return 0;
}
static int chunk_end(AVFormatContext *s)
{
WebMChunkContext *wc = s->priv_data;
AVFormatContext *oc = wc->avf;
int ret;
if (wc->chunk_start_index == wc->chunk_index)
return 0;
// Flush the cluster in WebM muxer.
oc->oformat->write_packet(oc, NULL);
ret = avio_close(oc->pb);
if (ret < 0)
return ret;
wc->chunk_count++;
return 0;
}
static int webm_chunk_write_packet(AVFormatContext *s, AVPacket *pkt)
{
WebMChunkContext *wc = s->priv_data;
AVFormatContext *oc = wc->avf;
AVStream *st = s->streams[pkt->stream_index];
int ret;
if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
wc->duration_written += av_rescale_q(pkt->pts - wc->prev_pts,
st->time_base,
(AVRational) {1, 1000});
wc->prev_pts = pkt->pts;
}
// For video, a new chunk is started only on key frames. For audio, a new
// chunk is started based on chunk_duration.
if ((st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
(pkt->flags & AV_PKT_FLAG_KEY)) ||
(st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
(pkt->pts == 0 || wc->duration_written >= wc->chunk_duration))) {
wc->duration_written = 0;
if ((ret = chunk_end(s)) < 0 || (ret = chunk_start(s)) < 0) {
goto fail;
}
}
if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && pkt->pts == 0) {
goto fail;
}
ret = oc->oformat->write_packet(oc, pkt);
if (ret < 0)
goto fail;
fail:
if (ret < 0) {
oc->streams = NULL;
oc->nb_streams = 0;
avformat_free_context(oc);
}
return ret;
}
static int webm_chunk_write_trailer(AVFormatContext *s)
{
WebMChunkContext *wc = s->priv_data;
AVFormatContext *oc = wc->avf;
oc->oformat->write_trailer(oc);
chunk_end(s);
oc->streams = NULL;
oc->nb_streams = 0;
avformat_free_context(oc);
return 0;
}
#define OFFSET(x) offsetof(WebMChunkContext, x)
static const AVOption options[] = {
{ "chunk_start_index", "start index of the chunk", OFFSET(chunk_start_index), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
{ "header", "filename of the header where the initialization data will be written", OFFSET(header_filename), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
{ "audio_chunk_duration", "duration of each chunk in milliseconds", OFFSET(chunk_duration), AV_OPT_TYPE_INT, {.i64 = 5000}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
{ NULL },
};
#if CONFIG_WEBM_CHUNK_MUXER
static const AVClass webm_chunk_class = {
.class_name = "WebM Chunk Muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVOutputFormat ff_webm_chunk_muxer = {
.name = "webm_chunk",
.long_name = NULL_IF_CONFIG_SMALL("WebM Chunk Muxer"),
.mime_type = "video/webm",
.extensions = "chk",
.flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER | AVFMT_NEEDNUMBER |
AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
.priv_data_size = sizeof(WebMChunkContext),
.write_header = webm_chunk_write_header,
.write_packet = webm_chunk_write_packet,
.write_trailer = webm_chunk_write_trailer,
.priv_class = &webm_chunk_class,
};
#endif