| /* |
| * 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 <strings.h> |
| #include <float.h> |
| |
| #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->size && !(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, |
| }; |