HTML5 Audio Buffer getting stuck - html5-audio

Question

I'm using the HTML5 webkitAudioContext to get the realtime levels of a user's microphone using this following code:
var liveSource;
function getLevel(){
var context = new webkitAudioContext();
navigator.webkitGetUserMedia({audio: true}, function(stream) {
liveSource = context.createMediaStreamSource(stream);
liveSource.connect(context.destination);
var levelChecker = context.createJavaScriptNode(4096, 1 ,1);
liveSource.connect(levelChecker);
levelChecker.connect(context.destination);
levelChecker.onaudioprocess = function(e) {
var buffer = e.inputBuffer.getChannelData(0);
var maxVal = 0;
// Iterate through buffer to check if any of the |values| exceeds 1.
for (var i = 0; i < buffer.length; i++) {
if (maxVal < buffer[i]) {
maxVal = buffer[i];
}
}
if(maxVal <= 0.01){
console.log(0.0);
} else if(maxVal > 1){
console.log(1);
} else if(maxVal > 0.2){
console.log(0.2);
} else if(maxVal > 0.1){
console.log(0.1);
} else if(maxVal > 0.05){
console.log(0.05);
} else if(maxVal > 0.025){
console.log(0.025);
} else if(maxVal > 0.01){
console.log(0.01);
}
};
});
}
getLevel();
If you copy and paste this in to your console and click your fingers near your microphone (assuming you've enabled microphone input) you'll see it works for a few seconds, then suddenly stops. It doesn't report any errors. Can anybody explain why this is happening? Thanks
See http://labs.dinahmoe.com/dynamicmusicengine/ for an example where the levels are working correctly.

Answer 1

I had the same problem but finally got the solution! The problem is the javascript node cicle.
I suggest you to change the createJavaScriptNode() first:
var levelChecker = context.createScriptProcessor(4096, 1 ,1);
The garbage collector has a problem with "levelChecker" variable and his onaudioprocess , so you have to bind the scriptprocessor or the onaudioProcess callback to the window. Here the HOLY SOLUTION:
levelChecker.onaudioprocess = window.audioProcess = function(e) { ...
Just add window.audioProcess in that line and you will never deal with tat problem anymore.
Here you can find further info : http://lists.w3.org/Archives/Public/public-audio/2013JanMar/0304.html
Hope that works for you!