# HG changeset patch
# User Nicholas Jillings <nicholas.jillings@eecs.qmul.ac.uk>
# Date 1437642638 -3600
# Node ID d0870902d0a6e5bd9f9c662a7a8617eb3ecfe865
# Parent  54c1fb5ca218ec1b44c410ea2cb5878cc13a8b05
Feature #1287: Padding added when looping is enabled to give synchronised looping.

diff -r 54c1fb5ca218 -r d0870902d0a6 core.js
--- a/core.js	Thu Jul 23 09:51:26 2015 +0100
+++ b/core.js	Thu Jul 23 10:10:38 2015 +0100
@@ -807,6 +807,45 @@
 		return ready;
 	};
 	
+	this.setSynchronousLoop = function() {
+		// Pads the signals so they are all exactly the same length
+		if (this.audioObjectsReady)
+		{
+			var length = 0;
+			var lens = [];
+			var maxId;
+			for (var i=0; i<this.audioObjects.length; i++)
+			{
+				lens.push(this.audioObjects[i].buffer.length);
+				if (length < this.audioObjects[i].buffer.length)
+				{
+					length = this.audioObjects[i].buffer.length;
+					maxId = i;
+				}
+			}
+			// Perform difference
+			for (var i=0; i<lens.length; i++)
+			{
+				lens[i] = length - lens[i];
+			}
+			// Extract the audio and zero-pad
+			for (var i=0; i<lens.length; i++)
+			{
+				var orig = this.audioObjects[i].buffer;
+				var hold = audioContext.createBuffer(orig.numberOfChannels,length,orig.sampleRate);
+				for (var c=0; c<orig.numberOfChannels; c++)
+				{
+					var inData = hold.getChannelData(c);
+					var outData = orig.getChannelData(c);
+					for (var n=0; n<orig.length; n++)
+					{inData[n] = outData[n];}
+				}
+				this.audioObjects[i].buffer = hold;
+				delete orig;
+			}
+		}
+	};
+	
 }
 
 function audioObject(id) {
diff -r 54c1fb5ca218 -r d0870902d0a6 example_eval/project.xml
--- a/example_eval/project.xml	Thu Jul 23 09:51:26 2015 +0100
+++ b/example_eval/project.xml	Thu Jul 23 10:10:38 2015 +0100
@@ -44,7 +44,7 @@
 			<anchor enforce="false">40</anchor>
 		</interface>
 	</setup>
-	<audioHolder id='test-0' hostURL="example_eval/" sampleRate="44100" randomiseOrder='true' repeatCount='0' loop='false' elementComments='true'>
+	<audioHolder id='test-0' hostURL="example_eval/" sampleRate="44100" randomiseOrder='true' repeatCount='0' loop='true' elementComments='true'>
 		<interface>
 			<title>Example Test Question</title>
 			<scale position="0">Min</scale>