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-rw-r--r--src/lib/audio_mapping.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/lib/audio_mapping.cc b/src/lib/audio_mapping.cc
index 86add09f4..f07d5dece 100644
--- a/src/lib/audio_mapping.cc
+++ b/src/lib/audio_mapping.cc
@@ -163,6 +163,8 @@ AudioMapping::AudioMapping (cxml::ConstNodePtr node, int state_version)
void
AudioMapping::set (int input_channel, int output_channel, float g)
{
+ DCPOMATIC_ASSERT (input_channel < int(_gain.size()));
+ DCPOMATIC_ASSERT (output_channel < int(_gain[0].size()));
_gain[input_channel][output_channel] = g;
}