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Javascript load and play audio files
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function TrackManager(trackFiles, onloadCallback){ | |
var audioContext, | |
tracks = {}, | |
loadedTracks = []; | |
window.AudioContext = window.AudioContext||window.webkitAudioContext; | |
audio_context = new AudioContext(); | |
function load_track(name, url){ | |
var request = new XMLHttpRequest(); | |
request.open('GET', url, true); | |
request.responseType = 'arraybuffer'; | |
request.onload = function(e) { | |
initSound(name, e.target.response); | |
console.log('loaded track ' + name); | |
loadedTracks.push(trackName); | |
if (loadedTracks.length === trackFiles.length) { | |
return onloadCallback(); | |
} | |
}; | |
request.send(); | |
} | |
function initSound(trackName, arrayBuffer) { | |
audio_context.decodeAudioData(arrayBuffer, function(buffer) { | |
tracks[trackName] = buffer; | |
}, function(e) { | |
console.log('Error decoding', e); | |
}); | |
} | |
for (trackName in trackFiles) { | |
loadTrack(trackName, trackFiles[trackName]); | |
} | |
this.playTrack = function(trackName){ | |
var source; | |
if (loadedTracks.indexOf(trackName) === -1) { | |
return false; | |
} | |
source = audio_context.createBufferSource(); | |
source.buffer = tracks[trackName]; | |
source.loop = false; | |
source.connect(audio_context.destination); | |
source.noteOn(0); | |
return source; | |
} | |
} | |
var sound, | |
tracks = { | |
track1: 'media/audio/track1.m4a', | |
track2: 'media/audio/track2.m4a', | |
track3: 'media/audio/track3.m4a' | |
}; | |
function allTracksLoaded(){ | |
console.log('all tracks loaded'); | |
track = sound.playTrack('track1'); | |
track.stop(); | |
} | |
sound = new TrackManager(tracks, allTracksLoaded); |
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