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/*
Copyright (C) 2013-2021 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef DCPOMATIC_FFMPEG_H
#define DCPOMATIC_FFMPEG_H
#include "file_group.h"
#include "ffmpeg_subtitle_period.h"
#include <dcp/warnings.h>
LIBDCP_DISABLE_WARNINGS
extern "C" {
#include <libavcodec/avcodec.h>
}
LIBDCP_ENABLE_WARNINGS
#include <boost/thread/mutex.hpp>
struct AVFormatContext;
struct AVFrame;
struct AVStream;
struct AVIOContext;
class FFmpegContent;
class FFmpegAudioStream;
class Log;
class FFmpeg
{
public:
explicit FFmpeg (std::shared_ptr<const FFmpegContent>);
virtual ~FFmpeg ();
std::shared_ptr<const FFmpegContent> ffmpeg_content () const {
return _ffmpeg_content;
}
int avio_read (uint8_t *, int);
int64_t avio_seek (int64_t, int);
protected:
AVCodecContext* video_codec_context () const;
AVCodecContext* subtitle_codec_context () const;
dcpomatic::ContentTime pts_offset (
std::vector<std::shared_ptr<FFmpegAudioStream>> audio_streams, boost::optional<dcpomatic::ContentTime> first_video, double video_frame_rate
) const;
static FFmpegSubtitlePeriod subtitle_period (AVPacket const* packet, AVStream const* stream, AVSubtitle const & sub);
std::shared_ptr<const FFmpegContent> _ffmpeg_content;
uint8_t* _avio_buffer = nullptr;
int _avio_buffer_size = 4096;
AVIOContext* _avio_context = nullptr;
FileGroup _file_group;
AVFormatContext* _format_context = nullptr;
std::vector<AVCodecContext*> _codec_context;
/** AVFrame used for decoding video */
AVFrame* _video_frame = nullptr;
/** Index of video stream within AVFormatContext */
boost::optional<int> _video_stream;
AVFrame* audio_frame (std::shared_ptr<const FFmpegAudioStream> stream);
/* It would appear (though not completely verified) that one must have
a mutex around calls to avcodec_open* and avcodec_close... and here
it is.
*/
static boost::mutex _mutex;
private:
void setup_general ();
void setup_decoders ();
/** AVFrames used for decoding audio streams; accessed with audio_frame() */
std::map<std::shared_ptr<const FFmpegAudioStream>, AVFrame*> _audio_frame;
};
#endif
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