Add AudioMapping::take_from().

2 files changed, 17 insertions, 0 deletions

diff --git a/src/lib/audio_mapping.cc b/src/lib/audio_mapping.cc
index 74b33aa35..b8aa6249f 100644
--- a/src/lib/audio_mapping.cc
+++ b/src/lib/audio_mapping.cc
@@ -288,3 +288,18 @@ AudioMapping::unmap_all ()
 		}
 	}
 }
+
+
+void
+AudioMapping::take_from(AudioMapping const& other)
+{
+	auto input = std::min(input_channels(), other.input_channels());
+	auto output = std::min(output_channels(), other.output_channels());
+
+	for (auto i = 0; i < input; ++i) {
+		for (auto o = 0; o < output; ++o) {
+			set(i, o, other.get(i, o));
+		}
+	}
+}
+
diff --git a/src/lib/audio_mapping.h b/src/lib/audio_mapping.h
index 0f59cc205..fe9a79789 100644
--- a/src/lib/audio_mapping.h
+++ b/src/lib/audio_mapping.h
@@ -76,6 +76,8 @@ public:
 	std::list<int> mapped_output_channels () const;
 	void unmap_all ();
 
+	void take_from(AudioMapping const& other);
+
 private:
 	void setup (int input_channels, int output_channels);