Support MPEG2 decompression.

1 files changed, 89 insertions, 0 deletions

diff --git a/src/mpeg2_transcode.h b/src/mpeg2_transcode.h
new file mode 100644
index 00000000..ef5c8351
--- /dev/null
+++ b/src/mpeg2_transcode.h
@@ -0,0 +1,89 @@
+/*
+    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;
+};
+
+
+}
+
+
+#endif