From ee0a4116a5526f0d6ae8fa763519b7bedd2dcce6 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Tue, 25 Jul 2023 13:11:14 +0200
Subject: Add audio_channels_to_write_to_mxf().

---
 src/lib/film_util.cc | 15 +++++++++++++++
 src/lib/film_util.h  |  2 ++
 2 files changed, 17 insertions(+)

diff --git a/src/lib/film_util.cc b/src/lib/film_util.cc
index 34f48d5a3..d196a1ee2 100644
--- a/src/lib/film_util.cc
+++ b/src/lib/film_util.cc
@@ -32,3 +32,18 @@ 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();
 }
+
+
+int
+audio_channels_to_write_to_mxf(shared_ptr<const Film> film)
+{
+	if (film->interop()) {
+		return film->audio_channels();
+	}
+
+	/* Compromise to try and avoid validation errors in some cases with DCPs that
+	 * don't have 8 or 16 channels (see bug #2443).
+	 */
+	return film->audio_channels() > 8 ? 16 : 8;
+}
+
diff --git a/src/lib/film_util.h b/src/lib/film_util.h
index f5b91f1f5..394b68380 100644
--- a/src/lib/film_util.h
+++ b/src/lib/film_util.h
@@ -26,3 +26,5 @@ class Film;
 
 
 bool channel_is_mapped(std::shared_ptr<const Film> film, dcp::Channel channel);
+int audio_channels_to_write_to_mxf(std::shared_ptr<const Film> film);
+
-- 
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