diff --git a/src/add-ons/media/media-add-ons/mixer/MixerOutput.cpp b/src/add-ons/media/media-add-ons/mixer/MixerOutput.cpp
index f79f0e2005..b8b2e353ff 100644
--- a/src/add-ons/media/media-add-ons/mixer/MixerOutput.cpp
+++ b/src/add-ons/media/media-add-ons/mixer/MixerOutput.cpp
@@ -22,3 +22,13 @@ MixerOutput::MediaOutput()
 {
 	return fOutput;
 }
+
+void
+MixerOutput::ChangeFormat(const media_multi_audio_format &format)
+{
+	fOutput.format.u.raw_audio = format;
+	fix_multiaudio_format(&fOutput.format.u.raw_audio);
+	
+	PRINT_OUTPUT("MixerOutput::ChangeFormat", fOutput);
+	PRINT_CHANNEL_MASK(fOutput.format);
+}
diff --git a/src/add-ons/media/media-add-ons/mixer/MixerOutput.h b/src/add-ons/media/media-add-ons/mixer/MixerOutput.h
index 40be973521..19f15b6b05 100644
--- a/src/add-ons/media/media-add-ons/mixer/MixerOutput.h
+++ b/src/add-ons/media/media-add-ons/mixer/MixerOutput.h
@@ -11,6 +11,8 @@ public:
 	
 	media_output & MediaOutput();
 	
+	void ChangeFormat(const media_multi_audio_format &format);
+	
 private:
 	MixerCore *fCore;
 	media_output fOutput;