Add channel_is_mapped().

1 files changed, 34 insertions, 0 deletions

diff --git a/src/lib/film_util.cc b/src/lib/film_util.cc
new file mode 100644
index 000000000..34f48d5a3
--- /dev/null
+++ b/src/lib/film_util.cc
@@ -0,0 +1,34 @@
+/*
+    Copyright (C) 2023 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 "film.h"
+#include "film_util.h"
+
+
+using std::shared_ptr;
+
+
+bool
+channel_is_mapped(shared_ptr<const Film> film, dcp::Channel channel)
+{
+	auto const mapped = film->mapped_audio_channels();
+	return std::find(mapped.begin(), mapped.end(), static_cast<int>(channel)) != mapped.end();
+}