# HG changeset patch
# User Chris Cannam <cannam@all-day-breakfast.com>
# Date 1490185307 0
# Node ID fafba3b9ba6b9f6a21d4e151cce2700255f7c226
# Parent  8c882ee9d097521bb8fe8066fbb72ef060a427f4
Fix failure to display spectrogram for single-channel audio!

diff -r 8c882ee9d097 -r fafba3b9ba6b src/app/spectrogram/Spectrogram.ts
--- a/src/app/spectrogram/Spectrogram.ts	Wed Mar 22 09:05:38 2017 +0000
+++ b/src/app/spectrogram/Spectrogram.ts	Wed Mar 22 12:21:47 2017 +0000
@@ -90,6 +90,7 @@
     const getSamples = ((buffer, channel) => {
       const nch = buffer.numberOfChannels;
       if (channel >= 0 || nch == 1) {
+	if (channel < 0) channel = 0;
 	return buffer.getChannelData(channel);
       } else {
         const before = performance.now();