302 lines
8.8 KiB
C
302 lines
8.8 KiB
C
/*
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* Generic segmenter
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* Copyright (c) 2011, 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 "avformat.h"
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#include "internal.h"
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#include "libavutil/log.h"
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#include "libavutil/opt.h"
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#include "libavutil/avstring.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/mathematics.h"
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typedef struct {
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const AVClass *class; /**< Class for private options. */
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int number;
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AVFormatContext *avf;
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char *format; /**< Set by a private option. */
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char *list; /**< Set by a private option. */
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int list_size; /**< Set by a private option. */
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float time; /**< Set by a private option. */
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int wrap; /**< Set by a private option. */
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int64_t offset_time;
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int64_t recording_time;
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int has_video;
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AVIOContext *pb;
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} SegmentContext;
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static int segment_start(AVFormatContext *s)
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{
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SegmentContext *seg = s->priv_data;
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AVFormatContext *oc = seg->avf;
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int err = 0;
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if (seg->wrap)
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seg->number %= seg->wrap;
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if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
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s->filename, seg->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->priv_data && oc->oformat->priv_data_size > 0) {
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oc->priv_data = av_mallocz(oc->oformat->priv_data_size);
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if (!oc->priv_data) {
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avio_close(oc->pb);
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return AVERROR(ENOMEM);
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}
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if (oc->oformat->priv_class) {
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*(const AVClass**)oc->priv_data = oc->oformat->priv_class;
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av_opt_set_defaults(oc->priv_data);
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}
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}
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if ((err = oc->oformat->write_header(oc)) < 0) {
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goto fail;
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}
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return 0;
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fail:
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av_log(oc, AV_LOG_ERROR, "Failure occurred when starting segment '%s'\n",
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oc->filename);
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avio_close(oc->pb);
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av_freep(&oc->priv_data);
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return err;
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}
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static int segment_end(AVFormatContext *s)
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{
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SegmentContext *seg = s->priv_data;
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AVFormatContext *oc = seg->avf;
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int ret = 0;
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if (oc->oformat->write_trailer)
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ret = oc->oformat->write_trailer(oc);
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if (ret < 0)
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av_log(s, AV_LOG_ERROR, "Failure occurred when ending segment '%s'\n",
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oc->filename);
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avio_close(oc->pb);
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if (oc->oformat->priv_class)
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av_opt_free(oc->priv_data);
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av_freep(&oc->priv_data);
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return ret;
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}
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static int seg_write_header(AVFormatContext *s)
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{
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SegmentContext *seg = s->priv_data;
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AVFormatContext *oc;
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int ret, i;
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seg->number = 0;
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seg->offset_time = 0;
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seg->recording_time = seg->time * 1000000;
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oc = avformat_alloc_context();
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if (!oc)
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return AVERROR(ENOMEM);
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if (seg->list)
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if ((ret = avio_open2(&seg->pb, seg->list, AVIO_FLAG_WRITE,
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&s->interrupt_callback, NULL)) < 0)
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goto fail;
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for (i = 0; i< s->nb_streams; i++)
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seg->has_video +=
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(s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO);
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if (seg->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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oc->oformat = av_guess_format(seg->format, s->filename, NULL);
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if (!oc->oformat) {
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ret = AVERROR_MUXER_NOT_FOUND;
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goto fail;
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}
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if (oc->oformat->flags & AVFMT_NOFILE) {
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av_log(s, AV_LOG_ERROR, "format %s not supported.\n",
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oc->oformat->name);
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ret = AVERROR(EINVAL);
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goto fail;
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}
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seg->avf = oc;
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oc->streams = s->streams;
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oc->nb_streams = s->nb_streams;
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if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
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s->filename, seg->number++) < 0) {
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ret = AVERROR(EINVAL);
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goto fail;
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}
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if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
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&s->interrupt_callback, NULL)) < 0)
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goto fail;
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if ((ret = avformat_write_header(oc, NULL)) < 0) {
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avio_close(oc->pb);
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goto fail;
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}
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if (seg->list) {
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avio_printf(seg->pb, "%s\n", oc->filename);
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avio_flush(seg->pb);
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}
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fail:
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if (ret) {
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if (oc) {
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oc->streams = NULL;
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oc->nb_streams = 0;
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avformat_free_context(oc);
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}
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if (seg->list)
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avio_close(seg->pb);
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}
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return ret;
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}
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static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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SegmentContext *seg = s->priv_data;
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AVFormatContext *oc = seg->avf;
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AVStream *st = oc->streams[pkt->stream_index];
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int64_t end_pts = seg->recording_time * seg->number;
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int ret;
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if ((seg->has_video && st->codec->codec_type == AVMEDIA_TYPE_VIDEO) &&
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av_compare_ts(pkt->pts, st->time_base,
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end_pts, AV_TIME_BASE_Q) >= 0 &&
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pkt->flags & AV_PKT_FLAG_KEY) {
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av_log(s, AV_LOG_DEBUG, "Next segment starts at %d %"PRId64"\n",
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pkt->stream_index, pkt->pts);
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ret = segment_end(s);
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if (!ret)
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ret = segment_start(s);
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if (ret)
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goto fail;
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if (seg->list) {
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avio_printf(seg->pb, "%s\n", oc->filename);
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avio_flush(seg->pb);
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if (seg->list_size && !(seg->number % seg->list_size)) {
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avio_close(seg->pb);
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if ((ret = avio_open2(&seg->pb, seg->list, AVIO_FLAG_WRITE,
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&s->interrupt_callback, NULL)) < 0)
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goto fail;
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}
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}
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}
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ret = oc->oformat->write_packet(oc, pkt);
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fail:
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if (ret < 0) {
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oc->streams = NULL;
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oc->nb_streams = 0;
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if (seg->list)
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avio_close(seg->pb);
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avformat_free_context(oc);
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}
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return ret;
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}
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static int seg_write_trailer(struct AVFormatContext *s)
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{
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SegmentContext *seg = s->priv_data;
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AVFormatContext *oc = seg->avf;
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int ret = segment_end(s);
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if (seg->list)
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avio_close(seg->pb);
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oc->streams = NULL;
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oc->nb_streams = 0;
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avformat_free_context(oc);
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return ret;
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}
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#define OFFSET(x) offsetof(SegmentContext, x)
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#define E AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{ "segment_format", "container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
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{ "segment_time", "segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E },
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{ "segment_list", "output the segment list", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
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{ "segment_list_size", "maximum number of playlist entries", OFFSET(list_size), AV_OPT_TYPE_INT, {.dbl = 5}, 0, INT_MAX, E },
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{ "segment_wrap", "number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, E },
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{ NULL },
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};
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static const AVClass seg_class = {
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.class_name = "segment 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_segment_muxer = {
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.name = "segment",
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.long_name = NULL_IF_CONFIG_SMALL("segment muxer"),
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.priv_data_size = sizeof(SegmentContext),
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.flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE,
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.write_header = seg_write_header,
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.write_packet = seg_write_packet,
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.write_trailer = seg_write_trailer,
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.priv_class = &seg_class,
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};
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static const AVClass sseg_class = {
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.class_name = "stream_segment 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_stream_segment_muxer = {
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.name = "stream_segment,ssegment",
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.long_name = NULL_IF_CONFIG_SMALL("streaming segment muxer"),
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.priv_data_size = sizeof(SegmentContext),
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.flags = AVFMT_NOFILE,
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.write_header = seg_write_header,
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.write_packet = seg_write_packet,
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.write_trailer = seg_write_trailer,
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.priv_class = &sseg_class,
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};
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