add getPeaks background compatibility (#1072)

* add getPeaks background compatibility * remove space * add space
katspaugh · May 4, 2017 · 0066f2c · 0066f2c
1 parent b65d9e9
commit 0066f2c
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/webaudio.js b/src/webaudio.js
@@ -218,6 +218,9 @@ WaveSurfer.WebAudio = {
     getPeaks: function (length, first, last) {
         if (this.peaks) { return this.peaks; }
 
+        first = first || 0;
+        last = last || length - 1;
+
         this.setLength(length);
 
         var sampleSize = this.buffer.length / length;