wavesurfer.js
Version:
Interactive navigable audio visualization using Web Audio and Canvas
204 lines (174 loc) • 8.19 kB
JavaScript
(function (root, factory) {
if (typeof define === 'function' && define.amd) {
define(['wavesurfer'], factory);
} else {
root.WaveSurfer.Timeline = factory(root.WaveSurfer);
}
}(this, function (WaveSurfer) {
'use strict';
WaveSurfer.Timeline = {
init: function (params) {
this.params = params;
var wavesurfer = this.wavesurfer = params.wavesurfer;
if (!this.wavesurfer) {
throw Error('No WaveSurfer intance provided');
}
var drawer = this.drawer = this.wavesurfer.drawer;
this.container = 'string' == typeof params.container ?
document.querySelector(params.container) : params.container;
if (!this.container) {
throw Error('No container for WaveSurfer timeline');
}
this.width = drawer.width;
this.height = this.params.height || 20;
this.notchPercentHeight = this.params.notchPercentHeight || 90;
this.primaryColor = this.params.primaryColor || '#000';
this.secondaryColor = this.params.secondaryColor || '#c0c0c0';
this.primaryFontColor = this.params.primaryFontColor || '#000';
this.secondaryFontColor = this.params.secondaryFontColor || '#000';
this.fontFamily = this.params.fontFamily || 'Arial';
this.fontSize = this.params.fontSize || 10;
this.timeInterval = this.params.timeInterval;
this.primaryLabelInterval = this.params.primaryLabelInterval;
this.secondaryLabelInterval = this.params.secondaryLabelInterval;
this.createWrapper();
this.createCanvas();
this.render();
wavesurfer.drawer.wrapper.onscroll = this.updateScroll.bind(this);
wavesurfer.on('redraw', this.render.bind(this));
wavesurfer.on('destroy', this.destroy.bind(this));
},
destroy: function () {
this.unAll();
if (this.wrapper && this.wrapper.parentNode) {
this.wrapper.parentNode.removeChild(this.wrapper);
this.wrapper = null;
}
},
createWrapper: function () {
var prevTimeline = this.container.querySelector('timeline');
if (prevTimeline) {
this.container.removeChild(prevTimeline);
}
var wsParams = this.wavesurfer.params;
this.wrapper = this.container.appendChild(
document.createElement('timeline')
);
this.drawer.style(this.wrapper, {
display: 'block',
position: 'relative',
userSelect: 'none',
webkitUserSelect: 'none',
height: this.height + 'px'
});
if (wsParams.fillParent || wsParams.scrollParent) {
this.drawer.style(this.wrapper, {
width: '100%',
overflowX: 'hidden',
overflowY: 'hidden'
});
}
var my = this;
this.wrapper.addEventListener('click', function (e) {
e.preventDefault();
var relX = 'offsetX' in e ? e.offsetX : e.layerX;
my.fireEvent('click', (relX / my.wrapper.scrollWidth) || 0);
});
},
createCanvas: function () {
var canvas = this.canvas = this.wrapper.appendChild(
document.createElement('canvas')
);
this.timeCc = canvas.getContext('2d');
this.wavesurfer.drawer.style(canvas, {
position: 'absolute',
zIndex: 4
});
},
render: function () {
this.updateCanvasStyle();
this.drawTimeCanvas();
},
updateCanvasStyle: function () {
var width = this.drawer.wrapper.scrollWidth;
this.canvas.width = width * this.wavesurfer.params.pixelRatio;
this.canvas.height = this.height * this.wavesurfer.params.pixelRatio;
this.canvas.style.width = width + 'px';
this.canvas.style.height = this.height + 'px';
},
drawTimeCanvas: function() {
var backend = this.wavesurfer.backend,
wsParams = this.wavesurfer.params,
duration = backend.getDuration();
if (wsParams.fillParent && !wsParams.scrollParent) {
var width = this.drawer.getWidth();
} else {
width = this.drawer.wrapper.scrollWidth * wsParams.pixelRatio;
}
var pixelsPerSecond = width/duration;
if (duration > 0) {
var curPixel = 0,
curSeconds = 0,
totalSeconds = parseInt(duration, 10) + 1,
formatTime = function(seconds) {
if (seconds/60 > 1) {
var minutes = parseInt(seconds / 60),
seconds = parseInt(seconds % 60);
seconds = (seconds < 10) ? '0' + seconds : seconds;
return '' + minutes + ':' + seconds;
} else {
return seconds;
}
};
if (pixelsPerSecond * 1 >= 25) {
var timeInterval = 1;
var primaryLabelInterval = 10;
var secondaryLabelInterval = 5;
} else if (pixelsPerSecond * 5 >= 25) {
var timeInterval = 5;
var primaryLabelInterval = 6;
var secondaryLabelInterval = 2;
} else if (pixelsPerSecond * 15 >= 25) {
var timeInterval = 15;
var primaryLabelInterval = 4;
var secondaryLabelInterval = 2;
} else {
var timeInterval = 60;
var primaryLabelInterval = 4;
var secondaryLabelInterval = 2;
}
timeInterval = this.timeInterval || timeInterval;
primaryLabelInterval = this.primaryLabelInterval || primaryLabelInterval;
secondaryLabelInterval = this.secondaryLabelInterval || secondaryLabelInterval;
var height1 = this.height - 4,
height2 = (this.height * (this.notchPercentHeight / 100.0)) - 4,
fontSize = this.fontSize * wsParams.pixelRatio;
for (var i = 0; i < totalSeconds/timeInterval; i++) {
if (i % primaryLabelInterval == 0) {
this.timeCc.fillStyle = this.primaryColor;
this.timeCc.fillRect(curPixel, 0, 1, height1);
this.timeCc.font = fontSize + 'px ' + this.fontFamily;
this.timeCc.fillStyle = this.primaryFontColor;
this.timeCc.fillText(formatTime(curSeconds), curPixel + 5, height1);
} else if (i % secondaryLabelInterval == 0) {
this.timeCc.fillStyle = this.secondaryColor;
this.timeCc.fillRect(curPixel, 0, 1, height1);
this.timeCc.font = fontSize + 'px ' + this.fontFamily;
this.timeCc.fillStyle = this.secondaryFontColor;
this.timeCc.fillText(formatTime(curSeconds), curPixel + 5, height1);
} else {
this.timeCc.fillStyle = this.secondaryColor;
this.timeCc.fillRect(curPixel, 0, 1, height2);
}
curSeconds += timeInterval;
curPixel += pixelsPerSecond * timeInterval;
}
}
},
updateScroll: function () {
this.wrapper.scrollLeft = this.drawer.wrapper.scrollLeft;
}
};
WaveSurfer.util.extend(WaveSurfer.Timeline, WaveSurfer.Observer);
return WaveSurfer.Timeline;
}));