From 02e8f03296d29949a7cffc8fa3e704b0efa66f17 Mon Sep 17 00:00:00 2001 From: Luca Barbato Date: Sun, 2 Oct 2011 23:05:29 +0200 Subject: [PATCH] segment: introduce segmented chain muxer It behaves similarly to image2 muxer --- Changelog | 1 + doc/muxers.texi | 32 ++++++ libavformat/Makefile | 1 + libavformat/allformats.c | 1 + libavformat/segment.c | 273 +++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 308 insertions(+) create mode 100644 libavformat/segment.c diff --git a/Changelog b/Changelog index 5f5154a..58568c2 100644 --- a/Changelog +++ b/Changelog @@ -109,6 +109,7 @@ easier to use. The changes are: - Dxtory capture format decoder - v410 QuickTime uncompressed 4:4:4 10-bit encoder and decoder - OpenMG Audio muxer +- Simple segmenting muxer version 0.7: diff --git a/doc/muxers.texi b/doc/muxers.texi index 17b1de3..5a609c8 100644 --- a/doc/muxers.texi +++ b/doc/muxers.texi @@ -90,6 +90,7 @@ avconv -i INPUT -c:a pcm_u8 -c:v mpeg2video -f framecrc - See also the @ref{crc} muxer. +@anchor{image2} @section image2 Image file muxer. @@ -267,4 +268,35 @@ For example a 3D WebM clip can be created using the following command line: avconv -i sample_left_right_clip.mpg -an -c:v libvpx -metadata STEREO_MODE=left_right -y stereo_clip.webm @end example +@section segment + +Basic stream segmenter. + +The segmenter muxer outputs streams to a number of separate files of nearly +fixed duration. Output filename pattern can be set in a fashion similar to +@ref{image2}. + +Every segment starts with a video keyframe, if a video stream is present. +The segment muxer works best with a single constant frame rate video. + +Optionally it can generate a flat list of the created segments, one segment +per line. + +@table @option +@item segment_format @var{format} +Override the inner container format, by default it is guessed by the filename +extension. +@item segment_time @var{t} +Set segment duration to @var{t} seconds. +@item segment_list @var{name} +Generate also a listfile named @var{name}. +@item segment_list_size @var{size} +Overwrite the listfile once it reaches @var{size} entries. +@end table + +@example +avconv -i in.mkv -c copy -map 0 -f segment -list out.list out%03d.nut +@end example + + @c man end MUXERS diff --git a/libavformat/Makefile b/libavformat/Makefile index ff6140b..c3a4c0d 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -268,6 +268,7 @@ OBJS-$(CONFIG_SAP_DEMUXER) += sapdec.o OBJS-$(CONFIG_SAP_MUXER) += sapenc.o rtpenc_chain.o OBJS-$(CONFIG_SDP_DEMUXER) += rtsp.o OBJS-$(CONFIG_SEGAFILM_DEMUXER) += segafilm.o +OBJS-$(CONFIG_SEGMENT_MUXER) += segment.o OBJS-$(CONFIG_SHORTEN_DEMUXER) += rawdec.o OBJS-$(CONFIG_SIFF_DEMUXER) += siff.o OBJS-$(CONFIG_SMACKER_DEMUXER) += smacker.o diff --git a/libavformat/allformats.c b/libavformat/allformats.c index c75f1ba..083ee08 100644 --- a/libavformat/allformats.c +++ b/libavformat/allformats.c @@ -197,6 +197,7 @@ void av_register_all(void) av_register_rdt_dynamic_payload_handlers(); #endif REGISTER_DEMUXER (SEGAFILM, segafilm); + REGISTER_MUXER (SEGMENT, segment); REGISTER_DEMUXER (SHORTEN, shorten); REGISTER_DEMUXER (SIFF, siff); REGISTER_DEMUXER (SMACKER, smacker); diff --git a/libavformat/segment.c b/libavformat/segment.c new file mode 100644 index 0000000..89ae62d --- /dev/null +++ b/libavformat/segment.c @@ -0,0 +1,273 @@ +/* + * Generic segmenter + * Copyright (c) 2011, 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 +#include + +#include "avformat.h" +#include "internal.h" + +#include "libavutil/log.h" +#include "libavutil/opt.h" +#include "libavutil/avstring.h" +#include "libavutil/parseutils.h" +#include "libavutil/mathematics.h" + +typedef struct { + const AVClass *class; /**< Class for private options. */ + int number; + AVFormatContext *avf; + char *format; /**< Set by a private option. */ + char *list; /**< Set by a private option. */ + float time; /**< Set by a private option. */ + int size; /**< Set by a private option. */ + int64_t offset_time; + int64_t recording_time; + int has_video; + AVIOContext *pb; +} SegmentContext; + +static int segment_start(AVFormatContext *s) +{ + SegmentContext *c = s->priv_data; + AVFormatContext *oc = c->avf; + int err = 0; + + if (av_get_frame_filename(oc->filename, sizeof(oc->filename), + s->filename, 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->priv_data && oc->oformat->priv_data_size > 0) { + oc->priv_data = av_mallocz(oc->oformat->priv_data_size); + if (!oc->priv_data) { + avio_close(oc->pb); + return AVERROR(ENOMEM); + } + if (oc->oformat->priv_class) { + *(const AVClass**)oc->priv_data = oc->oformat->priv_class; + av_opt_set_defaults(oc->priv_data); + } + } + + if ((err = oc->oformat->write_header(oc)) < 0) { + goto fail; + } + + return 0; + +fail: + avio_close(oc->pb); + av_freep(&oc->priv_data); + + return err; +} + +static int segment_end(AVFormatContext *oc) +{ + int ret = 0; + + if (oc->oformat->write_trailer) + ret = oc->oformat->write_trailer(oc); + + avio_close(oc->pb); + if (oc->oformat->priv_class) + av_opt_free(oc->priv_data); + av_freep(&oc->priv_data); + + return ret; +} + +static int seg_write_header(AVFormatContext *s) +{ + SegmentContext *seg = s->priv_data; + AVFormatContext *oc; + int ret, i; + + seg->number = 0; + seg->offset_time = 0; + seg->recording_time = seg->time * 1000000; + + if (seg->list) + if ((ret = avio_open2(&seg->pb, seg->list, AVIO_FLAG_WRITE, + &s->interrupt_callback, NULL)) < 0) + return ret; + + for (i = 0; i< s->nb_streams; i++) + seg->has_video += + (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO); + + if (seg->has_video > 1) + av_log(s, AV_LOG_WARNING, + "More than a single video stream present, " + "expect issues decoding it.\n"); + + oc = avformat_alloc_context(); + + if (!oc) { + ret = AVERROR(ENOMEM); + goto fail; + } + + oc->oformat = av_guess_format(seg->format, s->filename, NULL); + + if (!oc->oformat) { + ret = AVERROR_MUXER_NOT_FOUND; + goto fail; + } + if (oc->oformat->flags & AVFMT_NOFILE) { + av_log(s, AV_LOG_ERROR, "format %s not supported.\n", + oc->oformat->name); + ret = AVERROR(EINVAL); + goto fail; + } + + seg->avf = oc; + + oc->streams = s->streams; + oc->nb_streams = s->nb_streams; + + if (av_get_frame_filename(oc->filename, sizeof(oc->filename), + s->filename, seg->number++) < 0) { + ret = AVERROR(EINVAL); + goto fail; + } + + if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE, + &s->interrupt_callback, NULL)) < 0) + goto fail; + + if ((ret = avformat_write_header(oc, NULL)) < 0) { + avio_close(oc->pb); + goto fail; + } + + if (seg->list) { + avio_printf(seg->pb, "%s\n", oc->filename); + avio_flush(seg->pb); + } + +fail: + if (ret) { + oc->streams = NULL; + oc->nb_streams = 0; + if (seg->list) + avio_close(seg->pb); + avformat_free_context(oc); + } + return ret; +} + +static int seg_write_packet(AVFormatContext *s, AVPacket *pkt) +{ + SegmentContext *seg = s->priv_data; + AVFormatContext *oc = seg->avf; + AVStream *st = oc->streams[pkt->stream_index]; + int64_t end_pts = seg->recording_time * seg->number; + int ret; + + if ((seg->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) { + + av_log(s, AV_LOG_DEBUG, "Next segment starts at %d %"PRId64"\n", + pkt->stream_index, pkt->pts); + + ret = segment_end(oc); + + if (!ret) + ret = segment_start(s); + + if (ret) + goto fail; + + if (seg->list) { + avio_printf(seg->pb, "%s\n", oc->filename); + avio_flush(seg->pb); + if (!(seg->number % seg->size)) { + avio_close(seg->pb); + if ((ret = avio_open2(&seg->pb, seg->list, AVIO_FLAG_WRITE, + &s->interrupt_callback, NULL)) < 0) + goto fail; + + } + } + } + + ret = oc->oformat->write_packet(oc, pkt); + +fail: + if (ret < 0) { + oc->streams = NULL; + oc->nb_streams = 0; + if (seg->list) + avio_close(seg->pb); + avformat_free_context(oc); + } + + return ret; +} + +static int seg_write_trailer(struct AVFormatContext *s) +{ + SegmentContext *seg = s->priv_data; + AVFormatContext *oc = seg->avf; + int ret = segment_end(oc); + if (seg->list) + avio_close(seg->pb); + oc->streams = NULL; + oc->nb_streams = 0; + avformat_free_context(oc); + return ret; +} + +#define OFFSET(x) offsetof(SegmentContext, x) +#define E AV_OPT_FLAG_ENCODING_PARAM +static const AVOption options[] = { + { "segment_format", "container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E }, + { "segment_time", "segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E }, + { "segment_list", "output the segment list", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E }, + { "segment_list_size", "maximum number of playlist entries", OFFSET(size), AV_OPT_TYPE_INT, {.dbl = 5}, 0, INT_MAX, E }, + { NULL }, +}; + +static const AVClass seg_class = { + .class_name = "segment muxer", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, +}; + + +AVOutputFormat ff_segment_muxer = { + .name = "segment", + .long_name = NULL_IF_CONFIG_SMALL("segment muxer"), + .priv_data_size = sizeof(SegmentContext), + .flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE, + .write_header = seg_write_header, + .write_packet = seg_write_packet, + .write_trailer = seg_write_trailer, + .priv_class = &seg_class, +}; -- 2.7.4