From 86de2c2d30aece35fb81b1d8f72ecbf34e7c84b7 Mon Sep 17 00:00:00 2001
From: Chris Wilson <cwilso@gmail.com>
Date: Mon, 19 Nov 2012 12:55:05 -0600
Subject: [PATCH] Fixed getBuffer() by maintaining separate L and R channels.

Interleaves buffer only to export WAV.
---
 README.md         | 16 +++++++++++++++-
 recorderWorker.js | 26 +++++++++++++++-----------
 2 files changed, 30 insertions(+), 12 deletions(-)

diff --git a/README.md b/README.md
index 50ff9f20..a38025a6 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,21 @@ In addition, you may specify the type of Blob to be returned (defaults to 'audio
 
     rec.getBuffer([callback])
 
-This will pass the recorded buffer (as a Float32Array) to the callback. It can be played back by creating a new source buffer and setting this as its channel data (i.e. `newSource.buffer.getChannelData(0).set(recordedBuffer)`).
+This will pass the recorded stereo buffer (as an array of two Float32Arrays, for the separate left and right channels) to the callback. It can be played back by creating a new source buffer and setting these buffers as the separate channel data:
+
+	function getBufferCallback( buffers ) {
+		var newSource = audioContext.createBufferSourceNode();
+		var newBuffer = audioContext.createBuffer( 2, buffers[0].length, audioContext.sampleRate );
+		newBuffer.getChannelData(0).set(buffers[0]);
+		newBuffer.getChannelData(1).set(buffers[1]);
+		newSource.buffer = newBuffer;
+
+		newSource.connect( audioContext.destination );
+		newSource.start(0);
+	}
+
+This sample code will play back the stereo buffer.
+
 
     rec.configure(config)
 
diff --git a/recorderWorker.js b/recorderWorker.js
index 30ed9fe8..c5fa3662 100644
--- a/recorderWorker.js
+++ b/recorderWorker.js
@@ -1,5 +1,6 @@
 var recLength = 0,
-  recBuffers = [],
+  recBuffersL = [],
+  recBuffersR = [],
   sampleRate;
 
 this.onmessage = function(e){
@@ -27,29 +28,32 @@ function init(config){
 }
 
 function record(inputBuffer){
-  var bufferL = inputBuffer[0];
-  var bufferR = inputBuffer[1];
-  var interleaved = interleave(bufferL, bufferR);
-  recBuffers.push(interleaved);
-  recLength += interleaved.length;
+  recBuffersL.push(inputBuffer[0]);
+  recBuffersR.push(inputBuffer[1]);
+  recLength += inputBuffer[0].length;
 }
 
 function exportWAV(type){
-  var buffer = mergeBuffers(recBuffers, recLength);
-  var dataview = encodeWAV(buffer);
+  var bufferL = mergeBuffers(recBuffersL, recLength);
+  var bufferR = mergeBuffers(recBuffersR, recLength);
+  var interleaved = interleave(bufferL, bufferR);
+  var dataview = encodeWAV(interleaved);
   var audioBlob = new Blob([dataview], { type: type });
 
   this.postMessage(audioBlob);
 }
 
 function getBuffer() {
-  var buffer = mergeBuffers(recBuffers, recLength)
-  this.postMessage(buffer);
+  var buffers = [];
+  buffers.push( mergeBuffers(recBuffersL, recLength) );
+  buffers.push( mergeBuffers(recBuffersR, recLength) );
+  this.postMessage(buffers);
 }
 
 function clear(){
   recLength = 0;
-  recBuffers = [];
+  recBuffersL = [];
+  recBuffersR = [];
 }
 
 function mergeBuffers(recBuffers, recLength){