235 lines
6.4 KiB
C
235 lines
6.4 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 "libavutil/avstring.h"
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#include "libavutil/log.h"
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#include "libavutil/opt.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/parseutils.h"
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#include "avformat.h"
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#include "internal.h"
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#include <strings.h>
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#include <float.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 *pattern; /**< Set by a private option. */
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char *path; /**< Set by a private option. */
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float time; /**< 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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} SegmentContext;
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#if CONFIG_SEGMENT_MUXER
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static int segment_header(SegmentContext *s)
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{
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AVFormatContext *oc = s->avf;
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int err = 0;
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av_strlcpy(oc->filename, s->path, sizeof(oc->filename));
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av_strlcatf(oc->filename, sizeof(oc->filename),
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s->pattern, s->number++);
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if ((err = avio_open(&oc->pb, oc->filename, AVIO_FLAG_WRITE)) < 0) {
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return err;
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}
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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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}
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if ((err = oc->oformat->write_header(oc)) < 0) {
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avio_close(oc->pb);
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av_freep(&oc->priv_data);
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}
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return err;
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}
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static int segment_trailer(AVFormatContext *oc)
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{
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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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avio_close(oc->pb);
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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;
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seg->number = 0;
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seg->recording_time = seg->time*1000000;
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seg->offset_time = 0;
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if (!seg->path) {
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char *t;
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seg->path = av_strdup(s->filename);
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t = strrchr(seg->path, '.');
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if (t) *t = '\0';
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}
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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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}
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oc->oformat = av_guess_format(seg->format, NULL, NULL);
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if (!oc->oformat) {
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avformat_free_context(oc);
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return AVERROR_MUXER_NOT_FOUND;
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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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av_strlcpy(oc->filename, seg->path, sizeof(oc->filename));
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av_strlcatf(oc->filename, sizeof(oc->filename),
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seg->pattern, seg->number++);
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if ((ret = avio_open(&oc->pb, oc->filename, AVIO_FLAG_WRITE)) < 0) {
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avformat_free_context(oc);
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return ret;
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}
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if ((ret = avformat_write_header(oc, NULL)) < 0) {
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avio_close(oc->pb);
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}
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if (ret)
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avformat_free_context(oc);
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avio_printf(s->pb, "%s\n", oc->filename);
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avio_flush(s->pb);
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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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int ret;
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if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
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av_compare_ts(pkt->pts, st->time_base,
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seg->recording_time*seg->number,
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(AVRational){1, 1000000}) >= 0 &&
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pkt->flags & AV_PKT_FLAG_KEY) {
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av_log(s, AV_LOG_INFO, "I'd reset at %d %"PRId64"\n",
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pkt->stream_index, pkt->pts);
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ret = segment_trailer(oc);
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if (!ret)
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ret = segment_header(seg);
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if (ret) {
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avformat_free_context(oc);
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return ret;
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}
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avio_printf(s->pb, "%s\n", oc->filename);
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avio_flush(s->pb);
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}
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ret = oc->oformat->write_packet(oc, pkt);
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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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return segment_trailer(oc);
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}
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#endif /* CONFIG_SEGMENT_MUXER */
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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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{ "container_format", "container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = "nut"}, 0, 0, E },
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{ "segment_time", "segment lenght in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E },
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{ "segment_pattern", "pattern to use in segment files", OFFSET(pattern),AV_OPT_TYPE_STRING, {.str = "%03d"}, 0, 0, E },
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{ "segment_basename", "basename to use in segment files", OFFSET(path ),AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, 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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/* input
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#if CONFIG_IMAGE2_DEMUXER
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AVInputFormat ff_image2_demuxer = {
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.name = "image2",
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.long_name = NULL_IF_CONFIG_SMALL("image2 sequence"),
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.priv_data_size = sizeof(VideoData),
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.read_probe = read_probe,
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.read_header = read_header,
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.read_packet = read_packet,
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.flags = AVFMT_NOFILE,
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.priv_class = &img2_class,
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};
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#endif
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*/
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/* output */
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#if CONFIG_SEGMENT_MUXER
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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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.extensions = "m3u8",
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.priv_data_size = sizeof(SegmentContext),
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.flags = AVFMT_GLOBALHEADER,
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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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#endif
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