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audio.js
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audio.js
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// To play a sound, simply call audio.play_sound(id), where id is
// one of the keys of the g_sound_files array, e.g. "damage".
audio = (function() {
var g_context;
var g_audioMgr;
var g_sound_bank = {};
var g_can_play = false;
function WebAudioSound(name, filename, samples) {
this.name = name;
var that = this;
var req = new XMLHttpRequest();
req.open("GET", filename, true);
req.responseType = "arraybuffer";
req.onload = function() {
that.buffer = g_context.createBuffer(req.response, true);
}
req.addEventListener("error", function(e) {
log("failed to load:", filename, " : ", e.target.status);
}, false);
req.send();
}
WebAudioSound.prototype.play = function() {
if (!this.buffer) {
log(this.name, " not loaded");
return;
}
var src = g_context.createBufferSource();
src.buffer = this.buffer;
src.connect(g_context.destination);
src.noteOn(0);
};
function AudioTagSound(name, filename, samples) {
this.waiting_on_load = samples;
this.samples = samples;
this.name = name;
this.play_idx = 0;
this.audio = {};
for (var i = 0; i < samples; i++) {
var audio = new Audio();
var that = this;
audio.addEventListener("canplaythrough", function() {
that.waiting_on_load--;
}, false);
audio.src = filename;
//audio.onerror = handleError(filename, audio);
audio.load();
this.audio[i] = audio;
}
};
AudioTagSound.prototype.play = function() {
if (this.waiting_on_load > 0) {
log(this.name, " not loaded");
return;
}
this.play_idx = (this.play_idx + 1) % this.samples;
var a = this.audio[this.play_idx];
// log(this.name, ":", this.play_idx, ":", a.src);
var b = new Audio();
b.src = a.src;
b.addEventListener("canplaythrough", function() {
b.play();
}, false);
b.load();
};
function handleError(filename, audio) {
return function(e) {
log("can't load ", filename);
/*
if (filename.substr(filename.length - 4) == ".ogg") {
filename = filename.substr(0, filename.length - 4) + ".mp3";
log("trying ", filename);
audio.src = filename;
audio.onerror = handleError(filename, audio);
audio.load();
} else if (filename.substr(filename.length - 4) == ".mp3") {
filename = filename.substr(0, filename.length - 4) + ".wav";
log("trying ", filename);
audio.src = filename;
audio.onerror = handleError(filename, audio);
audio.load();
}
*/
}
}
function init(sounds, opt_noSound) {
if (opt_noSound) {
g_can_play = false;
return;
}
var a = new Audio()
g_can_play = a.canPlayType("audio/ogg") || a.canPlayType("audio/mp3");
if (!g_can_play)
return;
var create;
if (window.webkitAudioContext) {
log("Using Web Audio API");
g_context = new webkitAudioContext();
create = WebAudioSound;
} else {
log("Using Audio Tag");
create = AudioTagSound;
}
for (sound in sounds) {
var data = sounds[sound];
g_sound_bank[sound] = new create(sound, data.filename, data.samples);
}
}
function play_sound(name) {
if (!g_can_play)
return;
var sound = g_sound_bank[name];
if (!sound) {
console.error("audio: '" + name + "' not known.");
return;
}
sound.play();
}
return {
init: init,
play_sound: play_sound,
};
})();