mirror of https://git.ffmpeg.org/ffmpeg.git
310 lines
9.6 KiB
C
310 lines
9.6 KiB
C
/*
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* Copyright (c) 2015, Vignesh Venkatasubramanian
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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/**
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* @file WebM Chunk Muxer
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* The chunk muxer enables writing WebM Live chunks where there is a header
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* chunk, followed by data chunks where each Cluster is written out as a Chunk.
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*/
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#include "avformat.h"
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#include "avio.h"
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#include "avio_internal.h"
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#include "internal.h"
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#include "mux.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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#define MAX_FILENAME_SIZE 1024
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typedef struct WebMChunkContext {
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const AVClass *class;
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char *header_filename;
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int chunk_duration;
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int chunk_index;
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char *http_method;
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uint64_t duration_written;
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int64_t prev_pts;
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AVFormatContext *avf;
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int header_written;
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} WebMChunkContext;
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static int webm_chunk_init(AVFormatContext *s)
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{
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WebMChunkContext *wc = s->priv_data;
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const AVOutputFormat *oformat;
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AVFormatContext *oc;
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AVStream *st, *ost = s->streams[0];
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AVDictionary *dict = NULL;
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int ret;
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// DASH Streams can only have one track per file.
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if (s->nb_streams != 1)
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return AVERROR(EINVAL);
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if (!wc->header_filename) {
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av_log(s, AV_LOG_ERROR, "No header filename provided\n");
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return AVERROR(EINVAL);
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}
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wc->prev_pts = AV_NOPTS_VALUE;
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oformat = av_guess_format("webm", s->url, "video/webm");
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if (!oformat)
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return AVERROR_MUXER_NOT_FOUND;
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ret = avformat_alloc_output_context2(&wc->avf, oformat, NULL, NULL);
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if (ret < 0)
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return ret;
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oc = wc->avf;
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ff_format_set_url(oc, wc->header_filename);
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wc->header_filename = NULL;
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oc->interrupt_callback = s->interrupt_callback;
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oc->max_delay = s->max_delay;
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oc->flags = s->flags & ~AVFMT_FLAG_FLUSH_PACKETS;
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oc->strict_std_compliance = s->strict_std_compliance;
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oc->avoid_negative_ts = s->avoid_negative_ts;
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oc->flush_packets = 0;
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if ((ret = av_dict_copy(&oc->metadata, s->metadata, 0)) < 0)
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return ret;
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st = ff_stream_clone(oc, ost);
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if (!st)
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return AVERROR(ENOMEM);
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if (wc->http_method)
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if ((ret = av_dict_set(&dict, "method", wc->http_method, 0)) < 0)
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return ret;
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ret = s->io_open(s, &oc->pb, oc->url, AVIO_FLAG_WRITE, &dict);
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av_dict_free(&dict);
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if (ret < 0)
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return ret;
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oc->pb->seekable = 0;
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if ((ret = av_dict_set_int(&dict, "dash", 1, 0)) < 0 ||
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(ret = av_dict_set_int(&dict, "cluster_time_limit",
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wc->chunk_duration, 0)) < 0 ||
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(ret = av_dict_set_int(&dict, "live", 1, 0)) < 0)
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goto fail;
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ret = avformat_init_output(oc, &dict);
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fail:
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av_dict_free(&dict);
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if (ret < 0)
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return ret;
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// Copy the timing info back to the original stream
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// so that the timestamps of the packets are directly usable
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avpriv_set_pts_info(ost, st->pts_wrap_bits, st->time_base.num,
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st->time_base.den);
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// This ensures that the timestamps will already be properly shifted
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// when the packets arrive here, so we don't need to shift again.
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s->avoid_negative_ts = oc->avoid_negative_ts;
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ffformatcontext(s)->avoid_negative_ts_use_pts =
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ffformatcontext(oc)->avoid_negative_ts_use_pts;
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oc->avoid_negative_ts = AVFMT_AVOID_NEG_TS_DISABLED;
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ffformatcontext(oc)->avoid_negative_ts_status = AVOID_NEGATIVE_TS_DISABLED;
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return 0;
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}
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static int get_chunk_filename(AVFormatContext *s, char filename[MAX_FILENAME_SIZE])
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{
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WebMChunkContext *wc = s->priv_data;
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if (!filename) {
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return AVERROR(EINVAL);
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}
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if (av_get_frame_filename(filename, MAX_FILENAME_SIZE,
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s->url, wc->chunk_index - 1) < 0) {
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av_log(s, AV_LOG_ERROR, "Invalid chunk filename template '%s'\n", s->url);
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return AVERROR(EINVAL);
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}
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return 0;
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}
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static int webm_chunk_write_header(AVFormatContext *s)
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{
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WebMChunkContext *wc = s->priv_data;
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AVFormatContext *oc = wc->avf;
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AVStream *st = s->streams[0], *ost = oc->streams[0];
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int ret;
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ret = avformat_write_header(oc, NULL);
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ff_format_io_close(s, &oc->pb);
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ffstream(st)->lowest_ts_allowed = ffstream(ost)->lowest_ts_allowed;
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ffstream(ost)->lowest_ts_allowed = 0;
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wc->header_written = 1;
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if (ret < 0)
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return ret;
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return 0;
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}
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static int chunk_start(AVFormatContext *s)
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{
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WebMChunkContext *wc = s->priv_data;
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AVFormatContext *oc = wc->avf;
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int ret;
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ret = avio_open_dyn_buf(&oc->pb);
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if (ret < 0)
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return ret;
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wc->chunk_index++;
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return 0;
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}
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static int chunk_end(AVFormatContext *s, int flush)
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{
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WebMChunkContext *wc = s->priv_data;
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AVFormatContext *oc = wc->avf;
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int ret;
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int buffer_size;
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uint8_t *buffer;
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AVIOContext *pb;
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char filename[MAX_FILENAME_SIZE];
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AVDictionary *options = NULL;
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if (!oc->pb)
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return 0;
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if (flush)
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// Flush the cluster in WebM muxer.
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av_write_frame(oc, NULL);
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buffer_size = avio_close_dyn_buf(oc->pb, &buffer);
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oc->pb = NULL;
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ret = get_chunk_filename(s, filename);
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if (ret < 0)
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goto fail;
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if (wc->http_method)
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if ((ret = av_dict_set(&options, "method", wc->http_method, 0)) < 0)
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goto fail;
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ret = s->io_open(s, &pb, filename, AVIO_FLAG_WRITE, &options);
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av_dict_free(&options);
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if (ret < 0)
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goto fail;
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avio_write(pb, buffer, buffer_size);
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ff_format_io_close(s, &pb);
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fail:
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av_free(buffer);
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return (ret < 0) ? ret : 0;
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}
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static int webm_chunk_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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WebMChunkContext *wc = s->priv_data;
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AVFormatContext *oc = wc->avf;
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AVStream *st = s->streams[pkt->stream_index];
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int ret;
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if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
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if (wc->prev_pts != AV_NOPTS_VALUE)
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wc->duration_written += av_rescale_q(pkt->pts - wc->prev_pts,
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st->time_base,
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(AVRational) {1, 1000});
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wc->prev_pts = pkt->pts;
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}
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// For video, a new chunk is started only on key frames. For audio, a new
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// chunk is started based on chunk_duration. Also, a new chunk is started
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// unconditionally if there is no currently open chunk.
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if (!oc->pb || (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
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(pkt->flags & AV_PKT_FLAG_KEY)) ||
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(st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
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wc->duration_written >= wc->chunk_duration)) {
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wc->duration_written = 0;
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if ((ret = chunk_end(s, 1)) < 0 || (ret = chunk_start(s)) < 0) {
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return ret;
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}
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}
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// We only have one stream, so use the non-interleaving av_write_frame.
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return av_write_frame(oc, pkt);
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}
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static int webm_chunk_write_trailer(AVFormatContext *s)
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{
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WebMChunkContext *wc = s->priv_data;
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AVFormatContext *oc = wc->avf;
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int ret;
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if (!oc->pb) {
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ret = chunk_start(s);
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if (ret < 0)
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return ret;
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}
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ret = av_write_trailer(oc);
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if (ret < 0)
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return ret;
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return chunk_end(s, 0);
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}
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static void webm_chunk_deinit(AVFormatContext *s)
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{
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WebMChunkContext *wc = s->priv_data;
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if (!wc->avf)
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return;
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if (wc->header_written)
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ffio_free_dyn_buf(&wc->avf->pb);
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else
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ff_format_io_close(s, &wc->avf->pb);
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avformat_free_context(wc->avf);
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wc->avf = NULL;
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}
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#define OFFSET(x) offsetof(WebMChunkContext, x)
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static const AVOption options[] = {
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{ "chunk_start_index", "start index of the chunk", OFFSET(chunk_index), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
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{ "header", "filename of the header where the initialization data will be written", OFFSET(header_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
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{ "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 },
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{ "method", "set the HTTP method", OFFSET(http_method), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
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{ NULL },
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};
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static const AVClass webm_chunk_class = {
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.class_name = "WebM Chunk 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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const AVOutputFormat ff_webm_chunk_muxer = {
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.name = "webm_chunk",
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.long_name = NULL_IF_CONFIG_SMALL("WebM Chunk Muxer"),
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.mime_type = "video/webm",
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.extensions = "chk",
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.flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER | AVFMT_NEEDNUMBER |
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AVFMT_TS_NONSTRICT,
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.priv_data_size = sizeof(WebMChunkContext),
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.init = webm_chunk_init,
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.write_header = webm_chunk_write_header,
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.write_packet = webm_chunk_write_packet,
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.write_trailer = webm_chunk_write_trailer,
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.deinit = webm_chunk_deinit,
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.priv_class = &webm_chunk_class,
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};
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