Make BufferSet::is_silent work so that session silent_buffers are correctly silenced, preventing feedback from occurring with plugins that output non-zero values for zero inputs.

git-svn-id: svn://localhost/ardour2/branches/3.0@6124 d708f5d6-7413-0410-9779-e7cbd77b26cf

3 files changed, 13 insertions, 2 deletions

diff --git a/libs/ardour/ardour/buffer.h b/libs/ardour/ardour/buffer.h
index 46a6d62667..48fd7f099b 100644
--- a/libs/ardour/ardour/buffer.h
+++ b/libs/ardour/ardour/buffer.h
@@ -61,6 +61,7 @@ public:
 	DataType type() const { return _type; }
 
 	bool silent() const { return _silent; }
+	void is_silent(bool yn) { _silent = yn; }
 
 	/** Reallocate the buffer used internally to handle at least @a size_t units of data.
 	 *
diff --git a/libs/ardour/ardour/buffer_set.h b/libs/ardour/ardour/buffer_set.h
index f9547e69a2..0c4d5671d3 100644
--- a/libs/ardour/ardour/buffer_set.h
+++ b/libs/ardour/ardour/buffer_set.h
@@ -76,8 +76,7 @@ public:
 	const ChanCount& count() const { return _count; }
 	ChanCount&       count()       { return _count; }
 
-	void is_silent(bool yn) { _is_silent = yn; }
-	bool is_silent() const  { return _is_silent; }
+	void is_silent(bool yn);
 	void silence (nframes_t nframes, nframes_t offset);
 	bool is_mirror() const { return _is_mirror; }
 
diff --git a/libs/ardour/buffer_set.cc b/libs/ardour/buffer_set.cc
index c77db6a683..70f75985f7 100644
--- a/libs/ardour/buffer_set.cc
+++ b/libs/ardour/buffer_set.cc
@@ -335,5 +335,16 @@ BufferSet::silence (nframes_t nframes, nframes_t offset)
 	}
 }
 
+void
+BufferSet::is_silent (bool yn)
+{
+	for (std::vector<BufferVec>::iterator i = _buffers.begin(); i != _buffers.end(); ++i) {
+		for (BufferVec::iterator b = i->begin(); b != i->end(); ++b) {
+			(*b)->is_silent (yn);
+		}
+	}
+		
+}
+
 } // namespace ARDOUR