X-Git-Url: https://main.carlh.net/gitweb/?p=dcpomatic.git;a=blobdiff_plain;f=src%2Flib%2Faudio_buffers.cc;h=63204dd6a8684fd50897e68dff0b6b8d15ea30c5;hp=8d3a897c42d76eb7ecd7f0474afdba63ba014a27;hb=d291ce8580aabc2e4340c9887ea1733325bb1b80;hpb=4162285358cb4611e9faa7de576d57b47dbf2ec4

diff --git a/src/lib/audio_buffers.cc b/src/lib/audio_buffers.cc
index 8d3a897c4..63204dd6a 100644
--- a/src/lib/audio_buffers.cc
+++ b/src/lib/audio_buffers.cc
@@ -125,7 +125,9 @@ AudioBuffers::set_frames (int32_t f)
 {
 	DCPOMATIC_ASSERT (f <= _allocated_frames);
 
-	make_silent (f, _frames - f);
+	if (f < _frames) {
+		make_silent (f, _frames - f);
+	}
 	_frames = f;
 }
 
@@ -269,8 +271,11 @@ AudioBuffers::ensure_size (int32_t frames)
 		}
 	}
 
-	make_silent (_allocated_frames, frames - _allocated_frames);
+	int32_t const old_allocated = _allocated_frames;
 	_allocated_frames = frames;
+	if (old_allocated < _allocated_frames) {
+		make_silent (old_allocated, _allocated_frames - old_allocated);
+	}
 }
 
 /** Mix some other buffers with these ones.  The AudioBuffers must have the same number of channels.