tinymusic/dist/TinyMusic.min.js

A simple, lightweight music sequencer in JavaScript using the Web Audio API.

!function(a,b){"function"==typeof define&&define.amd?define(["exports"],b):b("object"==typeof exports&&"string"!=typeof exports.nodeName?exports:a.TinyMusic={})}(this,function(a){function b(a){var c=a.split(h);this.frequency=b.getFrequency(c[0])||0,this.duration=b.getDuration(c[1])||0}function c(a,b,c){this.ac=a||new AudioContext,this.createFxNodes(),this.tempo=b||120,this.loop=!0,this.smoothing=0,this.staccato=0,this.notes=[],this.push.apply(this,c||[])}var d="B#-C|C#-Db|D|D#-Eb|E-Fb|E#-F|F#-Gb|G|G#-Ab|A|A#-Bb|B-Cb",e=440*Math.pow(Math.pow(2,1/12),-9),f=/^[0-9.]+$/,g=4,h=/\s+/,i=/(\d+)/,j={};d.split("|").forEach(function(a,b){a.split("-").forEach(function(a){j[a]=b})}),b.getFrequency=function(a){var b=a.split(i),c=j[b[0]],d=(b[1]||g)-g,f=e*Math.pow(Math.pow(2,1/12),c);return f*Math.pow(2,d)},b.getDuration=function(a){return f.test(a)?parseFloat(a):a.toLowerCase().split("").reduce(function(a,b){return a+("w"===b?4:"h"===b?2:"q"===b?1:"e"===b?.5:"s"===b?.25:0)},0)},c.prototype.createFxNodes=function(){var a=[["bass",100],["mid",1e3],["treble",2500]],b=this.gain=this.ac.createGain();return a.forEach(function(a,c){c=this[a[0]]=this.ac.createBiquadFilter(),c.type="peaking",c.frequency.value=a[1],b.connect(b=c)}.bind(this)),b.connect(this.ac.destination),this},c.prototype.push=function(){return Array.prototype.forEach.call(arguments,function(a){this.notes.push(a instanceof b?a:new b(a))}.bind(this)),this},c.prototype.createCustomWave=function(a,b){b||(b=a),this.waveType="custom",this.customWave=[new Float32Array(a),new Float32Array(b)]},c.prototype.createOscillator=function(){return this.stop(),this.osc=this.ac.createOscillator(),this.customWave?this.osc.setPeriodicWave(this.ac.createPeriodicWave.apply(this.ac,this.customWave)):this.osc.type=this.waveType||"square",this.osc.connect(this.gain),this},c.prototype.scheduleNote=function(a,b){var c=60/this.tempo*this.notes[a].duration,d=c*(1-(this.staccato||0));return this.setFrequency(this.notes[a].frequency,b),this.smoothing&&this.notes[a].frequency&&this.slide(a,b,d),this.setFrequency(0,b+d),b+c},c.prototype.getNextNote=function(a){return this.notes[a<this.notes.length-1?a+1:0]},c.prototype.getSlideStartDelay=function(a){return a-Math.min(a,60/this.tempo*this.smoothing)},c.prototype.slide=function(a,b,c){var d=this.getNextNote(a),e=this.getSlideStartDelay(c);return this.setFrequency(this.notes[a].frequency,b+e),this.rampFrequency(d.frequency,b+c),this},c.prototype.setFrequency=function(a,b){return this.osc.frequency.setValueAtTime(a,b),this},c.prototype.rampFrequency=function(a,b){return this.osc.frequency.linearRampToValueAtTime(a,b),this},c.prototype.play=function(a){return a="number"==typeof a?a:this.ac.currentTime,this.createOscillator(),this.osc.start(a),this.notes.forEach(function(b,c){a=this.scheduleNote(c,a)}.bind(this)),this.osc.stop(a),this.osc.onended=this.loop?this.play.bind(this,a):null,this},c.prototype.stop=function(){return this.osc&&(this.osc.onended=null,this.osc.disconnect(),this.osc=null),this},a.Note=b,a.Sequence=c});
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