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1×
1×
1×
| 'use strict';
WaveSurfer.MediaElement = Object.create(WaveSurfer.WebAudio);
WaveSurfer.util.extend(WaveSurfer.MediaElement, {
init: function (params) {
this.params = params;
// Dummy media to catch errors
this.media = {
currentTime: 0,
duration: 0,
paused: true,
playbackRate: 1,
play: function () {},
pause: function () {}
};
this.mediaType = params.mediaType.toLowerCase();
this.elementPosition = params.elementPosition;
this.setPlaybackRate(this.params.audioRate);
this.createTimer();
},
/**
* Create a timer to provide a more precise `audioprocess' event.
*/
createTimer: function () {
var my = this;
var playing = false;
var onAudioProcess = function () {
if (my.isPaused()) { return; }
my.fireEvent('audioprocess', my.getCurrentTime());
// Call again in the next frame
var requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame;
requestAnimationFrame(onAudioProcess);
};
this.on('play', onAudioProcess);
},
/**
* Create media element with url as its source,
* and append to container element.
* @param {String} url path to media file
* @param {HTMLElement} container HTML element
* @param {Array} peaks array of peak data
*/
load: function (url, container, peaks) {
var my = this;
var media = document.createElement(this.mediaType);
media.controls = this.params.mediaControls;
media.autoplay = this.params.autoplay || false;
media.preload = 'auto';
media.src = url;
media.style.width = '100%';
var prevMedia = container.querySelector(this.mediaType);
if (prevMedia) {
container.removeChild(prevMedia);
}
container.appendChild(media);
this._load(media, peaks);
},
/**
* Load existing media element.
* @param {MediaElement} elt HTML5 Audio or Video element
* @param {Array} peaks array of peak data
*/
loadElt: function (elt, peaks) {
var my = this;
var media = elt;
media.controls = this.params.mediaControls;
media.autoplay = this.params.autoplay || false;
this._load(media, peaks);
},
/**
* Private method called by both load (from url)
* and loadElt (existing media element).
* @param {MediaElement} media HTML5 Audio or Video element
* @param {Array} peaks array of peak data
* @private
*/
_load: function (media, peaks) {
var my = this;
// load must be called manually on iOS, otherwise peaks won't draw
// until a user interaction triggers load --> 'ready' event
media.load();
media.addEventListener('error', function () {
my.fireEvent('error', 'Error loading media element');
});
media.addEventListener('canplay', function () {
my.fireEvent('canplay');
});
media.addEventListener('ended', function () {
my.fireEvent('finish');
});
this.media = media;
this.peaks = peaks;
this.onPlayEnd = null;
this.buffer = null;
this.setPlaybackRate(this.playbackRate);
},
isPaused: function () {
return !this.media || this.media.paused;
},
getDuration: function () {
var duration = this.media.duration;
if (duration >= Infinity) { // streaming audio
duration = this.media.seekable.end(0);
}
return duration;
},
getCurrentTime: function () {
return this.media && this.media.currentTime;
},
getPlayedPercents: function () {
return (this.getCurrentTime() / this.getDuration()) || 0;
},
/**
* Set the audio source playback rate.
*/
setPlaybackRate: function (value) {
this.playbackRate = value || 1;
this.media.playbackRate = this.playbackRate;
},
seekTo: function (start) {
if (start != null) {
this.media.currentTime = start;
}
this.clearPlayEnd();
},
/**
* Plays the loaded audio region.
*
* @param {Number} start Start offset in seconds,
* relative to the beginning of a clip.
* @param {Number} end End offset in seconds,
* relative to the beginning of a clip.
*/
play: function (start, end) {
this.seekTo(start);
this.media.play();
end && this.setPlayEnd(end);
this.fireEvent('play');
},
/**
* Pauses the loaded audio.
*/
pause: function () {
this.media && this.media.pause();
this.clearPlayEnd();
this.fireEvent('pause');
},
setPlayEnd: function (end) {
var my = this;
this.onPlayEnd = function (time) {
if (time >= end) {
my.pause();
my.seekTo(end);
}
};
this.on('audioprocess', this.onPlayEnd);
},
clearPlayEnd: function () {
if (this.onPlayEnd) {
this.un('audioprocess', this.onPlayEnd);
this.onPlayEnd = null;
}
},
getPeaks: function (length) {
if (this.buffer) {
return WaveSurfer.WebAudio.getPeaks.call(this, length);
}
return this.peaks || [];
},
getVolume: function () {
return this.media.volume;
},
setVolume: function (val) {
this.media.volume = val;
},
destroy: function () {
this.pause();
this.unAll();
this.media && this.media.parentNode && this.media.parentNode.removeChild(this.media);
this.media = null;
}
});
//For backwards compatibility
WaveSurfer.AudioElement = WaveSurfer.MediaElement;
|