From cdcc0e02820afb766b43392f1a517c0a5267c8bb Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Mon, 1 Feb 2010 17:25:43 +0000
Subject: [PATCH] silence extra buffers not handled/touched/filled by an AU
 (e.g. 2in/1out - silence the 2nd buffer)

git-svn-id: svn://localhost/ardour2/branches/2.0-ongoing@6610 d708f5d6-7413-0410-9779-e7cbd77b26cf
---
 libs/ardour/audio_unit.cc | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/libs/ardour/audio_unit.cc b/libs/ardour/audio_unit.cc
index acde4e7e0a..56a25e2d16 100644
--- a/libs/ardour/audio_unit.cc
+++ b/libs/ardour/audio_unit.cc
@@ -1207,6 +1207,15 @@ AUPlugin::connect_and_run (vector<Sample*>& bufs, uint32_t maxbuf, int32_t& in,
 				memcpy (bufs[i]+offset, buffers->mBuffers[i].mData, nframes * sizeof (Sample));
 			}
 		}
+
+		/* now silence any buffers that were passed in but the that the plugin
+		   did not fill/touch/use.
+		*/
+
+		for (i < maxbuf) {
+			memset (bufs[i]+offset, 0, nframes * sizeof (Sample));
+		}
+
 		return 0;
 	}