mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-30 21:26:13 +02:00
281 lines
8.5 KiB
C
281 lines
8.5 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 <float.h>
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#include <time.h>
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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 "libavutil/avassert.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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#include "libavutil/time.h"
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#include "libavutil/time_internal.h"
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#include "libavutil/timestamp.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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int chunk_start_index;
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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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int prev_pts;
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AVOutputFormat *oformat;
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AVFormatContext *avf;
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} WebMChunkContext;
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static int chunk_mux_init(AVFormatContext *s)
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{
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WebMChunkContext *wc = s->priv_data;
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AVFormatContext *oc;
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int ret;
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ret = avformat_alloc_output_context2(&wc->avf, wc->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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oc->interrupt_callback = s->interrupt_callback;
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oc->max_delay = s->max_delay;
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av_dict_copy(&oc->metadata, s->metadata, 0);
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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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av_opt_set_int(oc->priv_data, "dash", 1, 0);
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av_opt_set_int(oc->priv_data, "cluster_time_limit", wc->chunk_duration, 0);
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av_opt_set_int(oc->priv_data, "live", 1, 0);
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oc->streams = s->streams;
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oc->nb_streams = s->nb_streams;
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return 0;
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}
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static int get_chunk_filename(AVFormatContext *s, int is_header, char *filename)
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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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if (!filename) {
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return AVERROR(EINVAL);
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}
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if (is_header) {
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if (!wc->header_filename) {
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av_log(oc, AV_LOG_ERROR, "No header filename provided\n");
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return AVERROR(EINVAL);
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}
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av_strlcpy(filename, wc->header_filename, strlen(wc->header_filename) + 1);
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} else {
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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(oc, 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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}
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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 = NULL;
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int ret;
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int i;
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AVDictionary *options = NULL;
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// DASH Streams can only have either one track per file.
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if (s->nb_streams != 1) { return AVERROR_INVALIDDATA; }
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wc->chunk_index = wc->chunk_start_index;
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wc->oformat = av_guess_format("webm", s->url, "video/webm");
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if (!wc->oformat)
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return AVERROR_MUXER_NOT_FOUND;
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ret = chunk_mux_init(s);
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if (ret < 0)
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return ret;
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oc = wc->avf;
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ret = get_chunk_filename(s, 1, oc->url);
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if (ret < 0)
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return ret;
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if (wc->http_method)
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av_dict_set(&options, "method", wc->http_method, 0);
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ret = s->io_open(s, &oc->pb, oc->url, AVIO_FLAG_WRITE, &options);
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av_dict_free(&options);
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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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ret = oc->oformat->write_header(oc);
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if (ret < 0)
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return ret;
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ff_format_io_close(s, &oc->pb);
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for (i = 0; i < s->nb_streams; i++) {
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// ms precision is the de-facto standard timescale for mkv files.
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avpriv_set_pts_info(s->streams[i], 64, 1, 1000);
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}
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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)
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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 (wc->chunk_start_index == wc->chunk_index)
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return 0;
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// Flush the cluster in WebM muxer.
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oc->oformat->write_packet(oc, NULL);
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buffer_size = avio_close_dyn_buf(oc->pb, &buffer);
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ret = get_chunk_filename(s, 0, 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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av_dict_set(&options, "method", wc->http_method, 0);
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ret = s->io_open(s, &pb, filename, AVIO_FLAG_WRITE, &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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oc->pb = NULL;
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fail:
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av_dict_free(&options);
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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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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.
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if ((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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(pkt->pts == 0 || wc->duration_written >= wc->chunk_duration))) {
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wc->duration_written = 0;
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if ((ret = chunk_end(s)) < 0 || (ret = chunk_start(s)) < 0) {
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goto fail;
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}
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}
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ret = oc->oformat->write_packet(oc, pkt);
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if (ret < 0)
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goto fail;
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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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avformat_free_context(oc);
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}
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return ret;
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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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oc->oformat->write_trailer(oc);
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chunk_end(s);
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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 0;
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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_start_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, { 0 }, 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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#if CONFIG_WEBM_CHUNK_MUXER
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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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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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.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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.priv_class = &webm_chunk_class,
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};
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#endif
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