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webaudiox.loadbuffer.js
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webaudiox.loadbuffer.js
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var WebAudiox = WebAudiox || {}
/**
* Helper to load a buffer
*
* @param {AudioContext} context the WebAudio API context
* @param {String} url the url of the sound to load
* @param {Function} onLoad callback to notify when the buffer is loaded and decoded
* @param {Function} onError callback to notify when an error occured
*/
WebAudiox.loadBuffer = function(context, url, onLoad, onError){
onLoad = onLoad || function(buffer){}
onError = onError || function(){}
if( url instanceof Blob ){
var request = new FileReader();
} else {
var request = new XMLHttpRequest()
request.open('GET', url, true)
request.responseType = 'arraybuffer'
}
// counter inProgress request
WebAudiox.loadBuffer.inProgressCount++
request.onload = function(){
context.decodeAudioData(request.response, function(buffer){
// counter inProgress request
WebAudiox.loadBuffer.inProgressCount--
// notify the callback
onLoad(buffer)
// notify
WebAudiox.loadBuffer.onLoad(context, url, buffer)
}, function(){
// notify the callback
onError()
// counter inProgress request
WebAudiox.loadBuffer.inProgressCount--
})
}
request.send()
}
/**
* global onLoad callback. it is notified everytime .loadBuffer() load something
* @param {AudioContext} context the WebAudio API context
* @param {String} url the url of the sound to load
* @param {[type]} buffer the just loaded buffer
*/
WebAudiox.loadBuffer.onLoad = function(context, url, buffer){}
/**
* counter of all the .loadBuffer in progress. usefull to know is all your sounds
* as been loaded
* @type {Number}
*/
WebAudiox.loadBuffer.inProgressCount = 0