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, 77 insertions, 0 deletions

diff --git a/src/lib/atmos_content.cc b/src/lib/atmos_content.cc
new file mode 100644
index 000000000..c424f96d3
--- /dev/null
+++ b/src/lib/atmos_content.cc
@@ -0,0 +1,77 @@
+/*
+    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 <dcp/raw_convert.h>
+#include <libxml++/libxml++.h>
+
+
+using std::string;
+using boost::shared_ptr;
+
+
+int const AtmosContentProperty::EDIT_RATE = 700;
+
+
+AtmosContent::AtmosContent (Content* parent)
+	: ContentPart (parent)
+	, _length (0)
+{
+
+}
+
+
+AtmosContent::AtmosContent (Content* parent, cxml::ConstNodePtr node)
+	: ContentPart (parent)
+{
+	_length = node->number_child<Frame>("Length");
+	_edit_rate = dcp::Fraction (node->string_child("EditRate"));
+}
+
+
+shared_ptr<AtmosContent>
+AtmosContent::from_xml (Content* parent, cxml::ConstNodePtr node)
+{
+	return shared_ptr<AtmosContent> (new AtmosContent(parent, node));
+}
+
+
+void
+AtmosContent::as_xml (xmlpp::Node* node) const
+{
+	node->add_child("Length")->add_child_text(dcp::raw_convert<string>(_length));
+	node->add_child("EditRate")->add_child_text(_edit_rate.as_string());
+}
+
+
+void
+AtmosContent::set_length (Frame len)
+{
+	maybe_set (_length, len, ContentProperty::LENGTH);
+}
+
+
+void
+AtmosContent::set_edit_rate (dcp::Fraction rate)
+{
+	maybe_set (_edit_rate, rate, AtmosContentProperty::EDIT_RATE);
+}
+