Support MPEG2 compression.v1.9.6

1 files changed, 93 insertions, 0 deletions

diff --git a/src/mpeg2_picture_asset_writer_common.cc b/src/mpeg2_picture_asset_writer_common.cc
new file mode 100644
index 00000000..d46057f7
--- /dev/null
+++ b/src/mpeg2_picture_asset_writer_common.cc
@@ -0,0 +1,93 @@
+/*
+    Copyright (C) 2012-2021 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.
+*/
+
+
+/** @file  src/mpeg2_picture_asset_writer_common.cc
+ *  @brief Common parts of MPEG2PictureAssetWriter
+ */
+
+
+#include "filesystem.h"
+
+
+using std::shared_ptr;
+
+
+namespace dcp {
+
+
+class MPEG2PictureAssetWriter;
+
+
+struct ASDCPMPEG2StateBase
+{
+	ASDCP::MPEG2::Parser mpeg2_parser;
+	ASDCP::WriterInfo writer_info;
+	ASDCP::MPEG2::VideoDescriptor video_descriptor;
+};
+
+
+}
+
+
+template <class P, class Q>
+void dcp::start(MPEG2PictureAssetWriter* writer, shared_ptr<P> state, Q* asset, uint8_t const * data, int size)
+{
+	asset->set_file (writer->_file);
+
+	if (ASDCP_FAILURE(state->mpeg2_parser.OpenRead(data, size))) {
+		boost::throw_exception(MiscError("could not parse MPEG2 frame"));
+	}
+
+	state->mpeg2_parser.FillVideoDescriptor(state->video_descriptor);
+	state->video_descriptor.EditRate = ASDCP::Rational(asset->edit_rate().numerator, asset->edit_rate().denominator);
+
+	asset->set_size(Size(state->video_descriptor.StoredWidth, state->video_descriptor.StoredHeight));
+	asset->set_screen_aspect_ratio(Fraction(state->video_descriptor.AspectRatio.Numerator, state->video_descriptor.AspectRatio.Denominator));
+
+	asset->fill_writer_info(&state->writer_info, asset->id());
+
+	auto r = state->mxf_writer.OpenWrite(
+		dcp::filesystem::fix_long_path(*asset->file()).string().c_str(),
+		state->writer_info,
+		state->video_descriptor,
+		16384,
+		writer->_overwrite
+		);
+
+	if (ASDCP_FAILURE(r)) {
+		boost::throw_exception(MXFFileError("could not open MXF file for writing", asset->file()->string(), r));
+	}
+
+	writer->_started = true;
+}