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/*
Copyright (C) 2023 Carl Hetherington <cth@carlh.net>
This file is part of libdcp.
libdcp 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.
libdcp 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 libdcp. If not, see <http://www.gnu.org/licenses/>.
In addition, as a special exception, the copyright holders give
permission to link the code of portions of this program with the
OpenSSL library under certain conditions as described in each
individual source file, and distribute linked combinations
including the two.
You must obey the GNU General Public License in all respects
for all of the code used other than OpenSSL. If you modify
file(s) with this exception, you may extend this exception to your
version of the file(s), but you are not obligated to do so. If you
do not wish to do so, delete this exception statement from your
version. If you delete this exception statement from all source
files in the program, then also delete it here.
*/
#ifndef LIBDCP_MPEG2_TRANSCODE_H
#define LIBDCP_MPEG2_TRANSCODE_H
#include "ffmpeg_image.h"
#include <memory>
struct AVCodec;
struct AVCodecContext;
struct AVFrame;
struct AVPacket;
namespace dcp {
class MonoMPEG2PictureFrame;
class MPEG2Codec
{
public:
MPEG2Codec() = default;
virtual ~MPEG2Codec();
MPEG2Codec(MPEG2Codec const&) = delete;
MPEG2Codec& operator=(MPEG2Codec const&) = delete;
protected:
AVCodec const* _codec;
AVCodecContext* _context;
};
class MPEG2Decompressor : public MPEG2Codec
{
public:
MPEG2Decompressor();
~MPEG2Decompressor();
std::vector<FFmpegImage> decompress_frame(std::shared_ptr<const MonoMPEG2PictureFrame> frame);
std::vector<FFmpegImage> flush();
private:
std::vector<FFmpegImage> decompress_packet(AVPacket* packet);
AVFrame* _decompressed_frame;
};
class MPEG2Compressor : public MPEG2Codec
{
public:
MPEG2Compressor(dcp::Size size, int video_frame_rate, int64_t bit_rate);
MPEG2Compressor(MPEG2Compressor const&) = delete;
MPEG2Compressor& operator=(MPEG2Compressor const&) = delete;
/** Frame data with frame index within the asset */
typedef std::pair<std::shared_ptr<MonoMPEG2PictureFrame>, int64_t> IndexedFrame;
boost::optional<IndexedFrame> compress_frame(FFmpegImage const& image);
boost::optional<IndexedFrame> flush();
private:
boost::optional<IndexedFrame> send_and_receive(AVFrame const* frame);
};
}
#endif
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