# HG changeset patch
# User Chris Cannam <c.cannam@qmul.ac.uk>
# Date 1399978010 -3600
# Node ID 3236a2a75b42d9459312b76834ca9d2b42ed996e
# Parent  54c4b7719ff29c1d3e8c4cb200ffb97d42bc1956
Fix buffer underrun

diff -r 54c4b7719ff2 -r 3236a2a75b42 cpp-qm-dsp/processfile.cpp
--- a/cpp-qm-dsp/processfile.cpp	Sat May 10 13:44:24 2014 +0100
+++ b/cpp-qm-dsp/processfile.cpp	Tue May 13 11:46:50 2014 +0100
@@ -146,7 +146,9 @@
 
 	if (doDiff) {
 	    for (int i = 0; i < (int)cqout.size(); ++i) {
-		cqout[i] -= buffer[outframe + i - latency];
+		if (outframe + i >= latency) {
+		    cqout[i] -= buffer[outframe + i - latency];
+		}
 	    }
 	    
 	    if (outframe >= latency) {
@@ -181,7 +183,9 @@
     sf_writef_double(sndfileOut, r.data(), r.size());
     if (doDiff) {
 	for (int i = 0; i < (int)r.size(); ++i) {
-	    r[i] -= buffer[outframe + i - latency];
+	    if (outframe + i >= latency) {
+		r[i] -= buffer[outframe + i - latency];
+	    }
 	}
 	sf_writef_double(sndDiffFile, r.data(), r.size());
     }