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wave.js
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wave.js
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'use strict';
function _defineProperty(obj, key, value) {
if (key in obj) {
Object.defineProperty(obj, key, {
value: value,
enumerable: true,
configurable: true,
writable: true,
});
} else {
obj[key] = value;
}
return obj;
}
class Wave {
constructor() {
_defineProperty(this, 'current_stream', {});
_defineProperty(this, 'sources', {});
_defineProperty(this, 'onFileLoad', void 0);
}
findSize(size) {
for (var range = 1; range <= 40; range++) {
var power = 2 ** range;
if (size <= power) return power;
}
}
visualize(data, canvas, options = {}) {
//options
if (!options.stroke) options.stroke = 2;
if (!options.colors) options.colors = ['rgb(255, 53, 94)'];
var c;
if (typeof canvas == 'string') {
c = document.getElementById(canvas);
} else {
c = canvas;
}
var ctx = c.getContext('2d');
var h = c.height;
var w = c.width; //clear canvas
ctx.imageSmoothingEnabled = false;
ctx.clearRect(0, 0, w, h);
ctx.beginPath();
ctx.strokeStyle = options.colors[0];
ctx.lineWidth = options.stroke;
var min = 5;
var r = h / 4;
var offset = r / 2;
var cx = w / 2;
var cy = h / 2;
var point_count = 128;
var percent = (r - offset) / 255;
var increase = ((360 / point_count) * Math.PI) / 180;
var breakpoint = Math.floor(point_count / options.colors.length);
for (var point = 1; point <= point_count; point++) {
var p = (data[point] + min) * percent;
var a = point * increase;
var sx = cx + (r - (p - offset)) * Math.cos(a);
var sy = cy + (r - (p - offset)) * Math.sin(a);
ctx.moveTo(sx, sy);
var dx = cx + (r + p) * Math.cos(a);
var dy = cy + (r + p) * Math.sin(a);
ctx.lineTo(dx, dy);
if (point % breakpoint == 0) {
var i = point / breakpoint - 1;
ctx.strokeStyle = options.colors[i];
ctx.stroke();
ctx.beginPath();
}
}
ctx.stroke();
}
fromStream(stream, canvas_id, options = {}, muted = true) {
this.current_stream.id = canvas_id;
this.current_stream.options = options;
var audioCtx, analyser, source;
if (!this.sources[stream.toString()]) {
AudioContext = window.AudioContext || window.webkitAudioContext;
audioCtx = new AudioContext();
analyser = audioCtx.createAnalyser();
source = audioCtx.createMediaStreamSource(stream);
source.connect(analyser);
// source.connect(audioCtx.destination); //playback audio
this.sources[stream.toString()] = {
audioCtx: audioCtx,
analyser: analyser,
source: source,
};
} else {
cancelAnimationFrame(this.sources[stream.toString()].animation);
audioCtx = this.sources[stream.toString()].audioCtx;
analyser = this.sources[stream.toString()].analyser;
source = this.sources[stream.toString()].source;
}
// if (!muted) source.connect(audioCtx.destination); //playback audio
analyser.fftSize = 2048;
var bufferLength = analyser.frequencyBinCount;
this.current_stream.data = new Uint8Array(bufferLength);
var frame_count = 1;
var c = 1;
var self = this;
function renderFrame() {
window.requestAnimFrame =
window.requestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.msRequestAnimationFrame;
self.current_stream.animation = requestAnimFrame(
self.current_stream.loop
);
self.sources[stream.toString()]['animation'] =
self.current_stream.animation;
analyser.getByteFrequencyData(self.current_stream.data);
c++;
if (c % frame_count == 0) {
//every * frame
self.visualize(
self.current_stream.data,
self.current_stream.id,
self.current_stream.options
);
}
}
this.current_stream.loop = renderFrame;
renderFrame();
}
stopStream() {
cancelAnimationFrame(this.current_stream.animation);
}
playStream() {
this.current_stream.loop();
}
}
window.Wave = Wave;