Make Atmos content work more like other content. Now its MXFsencrypt-atmos

are re-written, meaning that they can be encrypted.

This commit is mostly just for the backend.  We also need a fair
few checks/restrictions in the UI:

- any present atmos content dictates the project frame rate
- no mixed edit rates of atmos content
- probably some other things I haven't thought of

1 files changed, 65 insertions, 0 deletions

diff --git a/src/lib/atmos_mxf_decoder.cc b/src/lib/atmos_mxf_decoder.cc
new file mode 100644
index 000000000..3f6f4a857
--- /dev/null
+++ b/src/lib/atmos_mxf_decoder.cc
@@ -0,0 +1,65 @@
+/*
+    Copyright (C) 2020 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/>.
+
+*/
+
+#include "atmos_content.h"
+#include "atmos_decoder.h"
+#include "atmos_mxf_content.h"
+#include "atmos_mxf_decoder.h"
+#include "dcpomatic_time.h"
+#include <dcp/atmos_asset.h>
+#include <dcp/atmos_asset_reader.h>
+
+using boost::shared_ptr;
+
+AtmosMXFDecoder::AtmosMXFDecoder (boost::shared_ptr<const Film> film, boost::shared_ptr<const AtmosMXFContent> content)
+	: Decoder (film)
+	, _content (content)
+{
+	atmos.reset (new AtmosDecoder(this, content));
+
+	shared_ptr<dcp::AtmosAsset> asset (new dcp::AtmosAsset(_content->path(0)));
+	_reader = asset->start_read ();
+	_metadata = AtmosMetadata (asset);
+}
+
+
+bool
+AtmosMXFDecoder::pass ()
+{
+	double const vfr = _content->active_video_frame_rate (film());
+	int64_t const frame = _next.frames_round (vfr);
+
+	if (frame >= _content->atmos->length()) {
+		return true;
+	}
+
+	atmos->emit (film(), _reader->get_frame(frame), frame, *_metadata);
+	_next += dcpomatic::ContentTime::from_frames (1, vfr);
+	return false;
+}
+
+
+void
+AtmosMXFDecoder::seek (dcpomatic::ContentTime t, bool accurate)
+{
+	Decoder::seek (t, accurate);
+	_next = t;
+}
+