/** @language english
* <p>The LWebAudio class is the base class for LSound object.</p>
* <p>LWebAudio is an abstract base class; therefore, you cannot call LWebAudio directly. </p>
* <p>The LWebAudio class is an abstract base class for all objects that can contain child objects. It cannot be instantiated directly.</p>
* @class LWebAudio
* @extends LEventDispatcher
* @constructor
* @since 1.9.0
* @public
*/
var LWebAudio = (function () {
function LWebAudio () {
var s = this;
LExtends(s, LEventDispatcher, []);
s.currentTime = 0;
s.currentStart = 0;
s.currentSave = 0;
/** @language english
* The length of LSound object
* @property length
* @type int
* @since 1.9.0
* @public
*/
s.length = 0;
s.loopStart = 0;
s.loopEnd = 0;
s.loopIndex = 0;
s.loopLength = 1;
/** @language english
* The LSound object is playing.
* @property playing
* @type Boolean
* @since 1.9.0
* @public
*/
s.playing = false;
s.volume = 1;
LSound.Container.add(s);
}
LWebAudio.container = [];
LWebAudio.containerCount = 0;
LWebAudio.audioTag = new Audio();
LWebAudio._context = null;
var p = {
getWebAudio : function () {
var data;
if(LWebAudio.containerCount > 0){
data = LWebAudio.container.shift();
} else {
if (typeof webkitAudioContext !== UNDEFINED) {
try {
data = new webkitAudioContext();
} catch (e) {
LWebAudio.containerCount = LWebAudio.container.length;
data = LWebAudio.container.shift();
}
} else if (typeof AudioContext !== UNDEFINED) {
try {
data = new AudioContext();
} catch (e) {
LWebAudio.containerCount = LWebAudio.container.length;
data = LWebAudio.container.shift();
}
} else {
throw "AudioContext not supported. :(";
}
}
if(!data.createGainNode){
data.createGainNode = data.createGain;
}
LWebAudio.container.push(data);
return data;
},
onload : function (data) {
var s = this;
if (Object.prototype.toString.apply(data) !== '[object AudioBuffer]') {
s.load(data);
return;
};
if(!s.data){
s.data = s.getWebAudio();
}
s.buffer = data;
s.length = s.buffer.duration;
var e = new LEvent(LEvent.COMPLETE);
e.currentTarget = s;
e.target = s.buffer;
s.dispatchEvent(e);
},
_onended : function () {
var s = this;
s.dispatchEvent(LEvent.SOUND_COMPLETE);
if (++s.loopIndex < s.loopLength) {
s.play(s.currentStart, undefined, s.currentTimeTo);
} else {
s.close();
}
},
/** @language english
* <p>Initiates loading of an external sound file from the specified URL. </p>
* <p>To support different browsers, you can look like this</p>
* <p>medio.load("medias/a.mp3,medias/a.wav,medias/a.ogg");</p>
* @method load
* @param {String} url A URL that points to an external sound file.(Can also use a ArrayBuffer or AudioBuffer)
* @since 1.9.0
* @public
*/
load : function (u) {
var s = this;
if (typeof u !== "string") {
if (Object.prototype.toString.apply(u) == '[object AudioBuffer]') {
s.onload(u);
} else if (Object.prototype.toString.apply(u) == '[object ArrayBuffer]') {
if(!s.data){
s.data = s.getWebAudio();
}
s.data.decodeAudioData(u, s.onload.bind(s), function (error) {
throw "AudioContext decodeAudioData error : " + error.toString();
});
}
return;
}
var a, b, c, k, d, q = {"mov" : ["quicktime"], "3gp" : ["3gpp"], "ogv" : ["ogg"], "m4a" : ["mpeg"], "mp3" : ["mpeg"], "wav" : ["wav", "x-wav", "wave"], "wave" : ["wav", "x-wav", "wave"], "aac" : ["mp4"]};
a = u.split(',');
for (k in a) {
b = a[k].split('.');
d = b[b.length - 1];
if (q[d]) {
d = q[d];
} else {
d = [d];
}
c = d.some(function (element, index, array) {
return LWebAudio.audioTag.canPlayType(s._type + "/" + element);
});
if (c) {
LAjax.responseType = LAjax.ARRAY_BUFFER;
LAjax.get(a[k], {}, s.onload.bind(s));
return;
}
}
},
/** @language english
* <p>Get the time of reproducing.</p>
* @method getCurrentTime
* @return {int} the time of reproducing.
* @since 1.9.0
* @public
*/
getCurrentTime : function () {
var s = this;
if (s.playing) {
return s.data.currentTime - s.currentSave + s.currentTime;
} else {
return s.currentSave;
}
},
/** @language english
* <p>Set the volume of media.</p>
* @method setVolume
* @param {float} value the volume。
* @since 1.9.0
* @public
*/
setVolume : function (v) {
var s = this;
s.volume = v;
if (s.playing) {
s.volumeNode.gain.value = v;
}
},
/** @language english
* <p>Get the volume of media.</p>
* @method getVolume
* @return {float} the volume.
* @since 1.9.0
* @public
*/
getVolume : function () {
return this.volume;
},
/** @language english
* <p>play the audio file.</p>
* @method play
* @param {float} startTime The initial position in milliseconds at which playback should start.
* @param {int} loops Defines the number of times a sound loops back to the startTime value before the sound channel stops playback.
* @since 1.9.0
* @public
*/
play : function (c, l, to) {
var s = this;
if (s.length == 0) {
return;
}
if (typeof l !== UNDEFINED) {
s.loopIndex = 0;
s.loopLength = l;
}
if (typeof c !== UNDEFINED) {
s.currentTime = c;
s.currentStart = c;
}
if (typeof to !== UNDEFINED) {
s.currentTimeTo = to > s.length ? s.length : to;
} else {
s.currentTimeTo = s.length;
}
s.data.loop = false;
s.playing = true;
if (s.timeout) {
clearTimeout(s.timeout);
delete s.timeout;
}
s.timeout = setTimeout(s._onended.bind(s), (s.currentTimeTo - s.currentTime) * 1000);
s.bufferSource = s.data.createBufferSource();
s.bufferSource.buffer = s.buffer;
s.volumeNode = s.data.createGainNode();
s.volumeNode.gain.value = s.volume;
s.volumeNode.connect(s.data.destination);
s.bufferSource.connect(s.volumeNode);
s.currentSave = s.data.currentTime;
if (s.bufferSource.start) {
s.bufferSource.start(0, s.currentTime, s.length - s.currentTime);
} else {
s.bufferSource.noteGrainOn(0, s.currentTime, s.length - s.currentTime);
}
},
/** @language english
* <p>play segment of audio.</p>
* @method playSegment
* @param {float} startTime The initial position in milliseconds at which playback should start.
* @param {float} segment length。
* @param {int} loops Defines the number of times a sound loops back to the startTime value before the sound channel stops playback.
* @since 1.9.0
* @public
*/
playSegment : function (c, seg, l) {
this.playTo(c, c + seg, l);
},
/** @language english
* <p>play segment of audio.</p>
* @method playTo
* @param {float} startTime start time.
* @param {float} endTime end time.
* @param {int} loops Defines the number of times a sound loops back to the startTime value before the sound channel stops playback.
* @since 1.9.0
* @public
*/
playTo : function (c, to, l) {
this.play(c, l, to);
},
/** @language english
* <p>Pauses the currently playing audio.</p>
* @method stop
* @since 1.9.0
* @public
*/
stop : function () {
var s = this;
if (!s.playing) {
return;
}
if (s.timeout) {
clearTimeout(s.timeout);
delete s.timeout;
}
if (s.bufferSource.stop) {
s.bufferSource.stop(0);
} else {
s.bufferSource.noteOff(0);
}
s.currentSave = s.getCurrentTime();
s.currentTime = s.currentSave;
s.playing = false;
},
/** @language english
* <p>Close the currently playing audio.</p>
* @method close
* @since 1.9.0
* @public
*/
close : function () {
var s = this;
if (!s.playing) {
return;
}
if (s.timeout) {
clearTimeout(s.timeout);
delete s.timeout;
}
if (s.bufferSource.stop) {
s.bufferSource.stop(0);
} else {
s.bufferSource.noteOff(0);
}
s.playing = false;
s.currentTime = 0;
s.currentSave = 0;
},
ll_check : function () {
var s = this;
if (!s.playing) {
return;
}
if (s.currentTimeTo < s.data.currentTime - s.currentSave + LSound.Container.time * 0.001) {
s._onended();
}
},
die : function () {
LSound.Container.remove(this);
}
};
for (var k in p) {
LWebAudio.prototype[k] = p[k];
}
return LWebAudio;
})();
/** @language english
* when the media is loaded
* <p><a href="LEvent.html#property_COMPLETE">LEvent.COMPLETE</a></p>
* @event LEvent.COMPLETE
*/
