From e826b92a672d30891e69c4eafdc4e0364e9245bf Mon Sep 17 00:00:00 2001
From: Juan Gallardo <jgallardo720@gmail.com>
Date: Wed, 28 May 2014 10:51:00 -0700
Subject: [PATCH] Adding audiosynth

Dynamic waveform audio synthesizer, written in Javascript.

Author is Keith Horwood. The source code is currently hosted at
https://github.com/keithwhor/audiosynth , which is where I got this
from.

There was no version number. So I contacted the creator of the library
on Twitter. He said that we could version it at 1.0.0
https://twitter.com/keithwhor/status/471706382379798528
---
 ajax/libs/audiosynth/1.0.0/audiosynth.js | 350 +++++++++++++++++++++++
 ajax/libs/audiosynth/LICENSE             |  20 ++
 ajax/libs/audiosynth/package.json        |  19 ++
 3 files changed, 389 insertions(+)
 create mode 100644 ajax/libs/audiosynth/1.0.0/audiosynth.js
 create mode 100644 ajax/libs/audiosynth/LICENSE
 create mode 100644 ajax/libs/audiosynth/package.json

diff --git a/ajax/libs/audiosynth/1.0.0/audiosynth.js b/ajax/libs/audiosynth/1.0.0/audiosynth.js
new file mode 100644
index 000000000..104c49026
--- /dev/null
+++ b/ajax/libs/audiosynth/1.0.0/audiosynth.js
@@ -0,0 +1,350 @@
+var Synth, AudioSynth, AudioSynthInstrument;
+!function(){
+
+	var URL = window.URL || window.webkitURL;
+	var Blob = window.Blob;
+
+	if(!URL || !Blob) {
+		throw new Error('This browser does not support AudioSynth');
+	}
+
+	var _encapsulated = false;
+	var AudioSynthInstance = null;
+	var pack = function(c,arg){ return [new Uint8Array([arg, arg >> 8]), new Uint8Array([arg, arg >> 8, arg >> 16, arg >> 24])][c]; };
+	var setPrivateVar = function(n,v,w,e){Object.defineProperty(this,n,{value:v,writable:!!w,enumerable:!!e});};
+	var setPublicVar = function(n,v,w){setPrivateVar.call(this,n,v,w,true);};
+	AudioSynthInstrument = function AudioSynthInstrument(){this.__init__.apply(this,arguments);};
+	var setPriv = setPrivateVar.bind(AudioSynthInstrument.prototype);
+	var setPub = setPublicVar.bind(AudioSynthInstrument.prototype);
+	setPriv('__init__', function(a,b,c) {
+		if(!_encapsulated) { throw new Error('AudioSynthInstrument can only be instantiated from the createInstrument method of the AudioSynth object.'); }
+		setPrivateVar.call(this, '_parent', a);
+		setPublicVar.call(this, 'name', b);
+		setPrivateVar.call(this, '_soundID', c);
+	});
+	setPub('play', function(note, octave, duration) {
+		return this._parent.play(this._soundID, note, octave, duration);
+	});
+	setPub('generate', function(note, octave, duration) {
+		return this._parent.generate(this._soundID, note, octave, duration);
+	});
+	AudioSynth = function AudioSynth(){if(AudioSynthInstance instanceof AudioSynth){return AudioSynthInstance;}else{ this.__init__(); return this; }};
+	setPriv = setPrivateVar.bind(AudioSynth.prototype);
+	setPub = setPublicVar.bind(AudioSynth.prototype);
+	setPriv('_debug',false,true);
+	setPriv('_bitsPerSample',16);
+	setPriv('_channels',1);
+	setPriv('_sampleRate',44100,true);
+	setPub('setSampleRate', function(v) {
+		this._sampleRate = Math.max(Math.min(v|0,44100), 4000);
+		this._clearCache();
+		return this._sampleRate;
+	});
+	setPub('getSampleRate', function() { return this._sampleRate; });
+	setPriv('_volume',32768,true);
+	setPub('setVolume', function(v) {
+		v = parseFloat(v); if(isNaN(v)) { v = 0; }
+		v = Math.round(v*32768);
+		this._volume = Math.max(Math.min(v|0,32768), 0);
+		this._clearCache();
+		return this._volume;
+	});
+	setPub('getVolume', function() { return Math.round(this._volume/32768*10000)/10000; });
+	setPriv('_notes',{'C':261.63,'C#':277.18,'D':293.66,'D#':311.13,'E':329.63,'F':346.23,'F#':369.99,'G':392.00,'G#':415.30,'A':440.00,'A#':466.16,'B':493.88});
+	setPriv('_fileCache',[],true);
+	setPriv('_temp',{},true);
+	setPriv('_sounds',[],true);
+	setPriv('_mod',[function(i,s,f,x){return Math.sin((2 * Math.PI)*(i/s)*f+x);}]);
+	setPriv('_resizeCache', function() {
+		var f = this._fileCache;
+		var l = this._sounds.length;
+		while(f.length<l) {
+			var octaveList = [];
+			for(var i = 0; i < 8; i++) {
+				var noteList = {};
+				for(var k in this._notes) {
+					noteList[k] = {};
+				} 
+				octaveList.push(noteList);
+			}
+			f.push(octaveList);
+		}
+	});
+	setPriv('_clearCache', function() {
+		this._fileCache = [];
+		this._resizeCache();
+	});
+	setPub('generate', function(sound, note, octave, duration) {
+		var thisSound = this._sounds[sound];
+		if(!thisSound) {
+			for(var i=0;i<this._sounds.length;i++) {
+				if(this._sounds[i].name==sound) {
+					thisSound = this._sounds[i];
+					sound = i;
+					break;
+				}
+			}
+		}
+		if(!thisSound) { throw new Error('Invalid sound or sound ID: ' + sound); }
+		var t = (new Date).valueOf();
+		this._temp = {};
+		octave |= 0;
+		octave = Math.min(8, Math.max(1, octave));
+		var time = !duration?2:parseFloat(duration);
+		if(typeof(this._notes[note])=='undefined') { throw new Error(note + ' is not a valid note.'); }
+		if(typeof(this._fileCache[sound][octave-1][note][time])!='undefined') {
+			if(this._debug) { console.log((new Date).valueOf() - t, 'ms to retrieve (cached)'); }
+			return this._fileCache[sound][octave-1][note][time];
+		} else {
+			var frequency = this._notes[note] * Math.pow(2,octave-4);
+			var sampleRate = this._sampleRate;
+			var volume = this._volume;
+			var channels = this._channels;
+			var bitsPerSample = this._bitsPerSample;
+			var attack = thisSound.attack(sampleRate, frequency, volume);
+			var dampen = thisSound.dampen(sampleRate, frequency, volume);
+			var waveFunc = thisSound.wave;
+			var waveBind = {modulate: this._mod, vars: this._temp};
+			var val = 0;
+			var curVol = 0;
+
+			var data = new Uint8Array(new ArrayBuffer(Math.ceil(sampleRate * time * 2)));
+			var attackLen = (sampleRate * attack) | 0;
+			var decayLen = (sampleRate * time) | 0;
+
+			for (var i = 0 | 0; i !== attackLen; i++) {
+		
+				val = volume * (i/(sampleRate*attack)) * waveFunc.call(waveBind, i, sampleRate, frequency, volume);
+
+				data[i << 1] = val;
+				data[(i << 1) + 1] = val >> 8;
+
+			}
+
+			for (; i !== decayLen; i++) {
+
+				val = volume * Math.pow((1-((i-(sampleRate*attack))/(sampleRate*(time-attack)))),dampen) * waveFunc.call(waveBind, i, sampleRate, frequency, volume);
+
+				data[i << 1] = val;
+				data[(i << 1) + 1] = val >> 8;
+
+			}
+
+			var out = [
+				'RIFF',
+				pack(1, 4 + (8 + 24/* chunk 1 length */) + (8 + 8/* chunk 2 length */)), // Length
+				'WAVE',
+				// chunk 1
+				'fmt ', // Sub-chunk identifier
+				pack(1, 16), // Chunk length
+				pack(0, 1), // Audio format (1 is linear quantization)
+				pack(0, channels),
+				pack(1, sampleRate),
+				pack(1, sampleRate * channels * bitsPerSample / 8), // Byte rate
+				pack(0, channels * bitsPerSample / 8),
+				pack(0, bitsPerSample),
+				// chunk 2
+				'data', // Sub-chunk identifier
+				pack(1, data.length * channels * bitsPerSample / 8), // Chunk length
+				data
+			];
+			var blob = new Blob(out, {type: 'audio/wav'});
+			var dataURI = URL.createObjectURL(blob);
+			this._fileCache[sound][octave-1][note][time] = dataURI;
+			if(this._debug) { console.log((new Date).valueOf() - t, 'ms to generate'); }
+			return dataURI;
+		}
+	});
+	setPub('play', function(sound, note, octave, duration) {
+		var src = this.generate(sound, note, octave, duration);
+		var audio = new Audio(src);
+		audio.play();
+		return true;
+	});
+	setPub('debug', function() { this._debug = true; });
+	setPub('createInstrument', function(sound) {
+		var n = 0;
+		var found = false;
+		if(typeof(sound)=='string') {
+			for(var i=0;i<this._sounds.length;i++) {
+				if(this._sounds[i].name==sound) {
+					found = true;
+					n = i;
+					break;
+				}
+			}
+		} else {
+			if(this._sounds[sound]) {
+				n = sound;
+				sound = this._sounds[n].name;
+				found = true;
+			}
+		}
+		if(!found) { throw new Error('Invalid sound or sound ID: ' + sound); }
+		_encapsulated = true;
+		var ins = new AudioSynthInstrument(this, sound, n);
+		_encapsulated = false;
+		return ins;
+	});
+	setPub('listSounds', function() {
+		var r = [];
+		for(var i=0;i<this._sounds.length;i++) {
+			r.push(this._sounds[i].name);
+		}
+		return r;
+	});
+	setPriv('__init__', function(){
+		this._resizeCache();
+	});
+	setPub('loadSoundProfile', function() {
+		for(var i=0,len=arguments.length;i<len;i++) {
+			o = arguments[i];
+			if(!(o instanceof Object)) { throw new Error('Invalid sound profile.'); }
+			this._sounds.push(o);
+		}
+		this._resizeCache();
+		return true;
+	});
+	setPub('loadModulationFunction', function() {
+		for(var i=0,len=arguments.length;i<len;i++) {
+			f = arguments[i];
+			if(typeof(f)!='function') { throw new Error('Invalid modulation function.'); }
+			this._mod.push(f);
+		}
+		return true;
+	});
+	AudioSynthInstance = new AudioSynth();
+	Synth = AudioSynthInstance;
+}();
+
+Synth.loadModulationFunction(
+	function(i, sampleRate, frequency, x) { return 1 * Math.sin(2 * Math.PI * ((i / sampleRate) * frequency) + x); },
+	function(i, sampleRate, frequency, x) { return 1 * Math.sin(4 * Math.PI * ((i / sampleRate) * frequency) + x); },
+	function(i, sampleRate, frequency, x) { return 1 * Math.sin(8 * Math.PI * ((i / sampleRate) * frequency) + x); },
+	function(i, sampleRate, frequency, x) { return 1 * Math.sin(0.5 * Math.PI * ((i / sampleRate) * frequency) + x); },
+	function(i, sampleRate, frequency, x) { return 1 * Math.sin(0.25 * Math.PI * ((i / sampleRate) * frequency) + x); },
+	function(i, sampleRate, frequency, x) { return 0.5 * Math.sin(2 * Math.PI * ((i / sampleRate) * frequency) + x); },
+	function(i, sampleRate, frequency, x) { return 0.5 * Math.sin(4 * Math.PI * ((i / sampleRate) * frequency) + x); },
+	function(i, sampleRate, frequency, x) { return 0.5 * Math.sin(8 * Math.PI * ((i / sampleRate) * frequency) + x); },
+	function(i, sampleRate, frequency, x) { return 0.5 * Math.sin(0.5 * Math.PI * ((i / sampleRate) * frequency) + x); },
+	function(i, sampleRate, frequency, x) { return 0.5 * Math.sin(0.25 * Math.PI * ((i / sampleRate) * frequency) + x); }
+);
+
+Synth.loadSoundProfile({
+	name: 'piano',
+	attack: function() { return 0.002; },
+	dampen: function(sampleRate, frequency, volume) {
+		return Math.pow(0.5*Math.log((frequency*volume)/sampleRate),2);
+	},
+	wave: function(i, sampleRate, frequency, volume) {
+		var base = this.modulate[0];
+		return this.modulate[1](
+			i,
+			sampleRate,
+			frequency,
+			Math.pow(base(i, sampleRate, frequency, 0), 2) +
+				(0.75 * base(i, sampleRate, frequency, 0.25)) +
+				(0.1 * base(i, sampleRate, frequency, 0.5))
+		);
+	}
+},
+{
+	name: 'organ',
+	attack: function() { return 0.3 },
+	dampen: function(sampleRate, frequency) { return 1+(frequency * 0.01); },
+	wave: function(i, sampleRate, frequency) {
+		var base = this.modulate[0];
+		return this.modulate[1](
+			i,
+			sampleRate,
+			frequency,
+			base(i, sampleRate, frequency, 0) +
+				0.5*base(i, sampleRate, frequency, 0.25) +
+				0.25*base(i, sampleRate, frequency, 0.5)
+		);
+	}
+},
+{
+	name: 'acoustic',
+	attack:	function() { return 0.002; },
+	dampen: function() { return 1; },
+	wave: function(i, sampleRate, frequency) {
+
+		var vars = this.vars;
+		vars.valueTable = !vars.valueTable?[]:vars.valueTable;
+		if(typeof(vars.playVal)=='undefined') { vars.playVal = 0; }
+		if(typeof(vars.periodCount)=='undefined') { vars.periodCount = 0; }
+	
+		var valueTable = vars.valueTable;
+		var playVal = vars.playVal;
+		var periodCount = vars.periodCount;
+
+		var period = sampleRate/frequency;
+		var p_hundredth = Math.floor((period-Math.floor(period))*100);
+
+		var resetPlay = false;
+
+		if(valueTable.length<=Math.ceil(period)) {
+	
+			valueTable.push(Math.round(Math.random())*2-1);
+	
+			return valueTable[valueTable.length-1];
+	
+		} else {
+	
+			valueTable[playVal] = (valueTable[playVal>=(valueTable.length-1)?0:playVal+1] + valueTable[playVal]) * 0.5;
+	
+			if(playVal>=Math.floor(period)) {
+				if(playVal<Math.ceil(period)) {
+					if((periodCount%100)>=p_hundredth) {
+						// Reset
+						resetPlay = true;
+						valueTable[playVal+1] = (valueTable[0] + valueTable[playVal+1]) * 0.5;
+						vars.periodCount++;	
+					}
+				} else {
+					resetPlay = true;	
+				}
+			}
+	
+			var _return = valueTable[playVal];
+			if(resetPlay) { vars.playVal = 0; } else { vars.playVal++; }
+	
+			return _return;
+	
+		}
+	}
+},
+{
+	name: 'edm',
+	attack:	function() { return 0.002; },
+	dampen: function() { return 1; },
+	wave: function(i, sampleRate, frequency) {
+		var base = this.modulate[0];
+		var mod = this.modulate.slice(1);
+		return mod[0](
+			i,
+			sampleRate,
+			frequency,
+			mod[9](
+				i,
+				sampleRate,
+				frequency,
+				mod[2](
+					i,
+					sampleRate,
+					frequency,
+					Math.pow(base(i, sampleRate, frequency, 0), 3) +
+						Math.pow(base(i, sampleRate, frequency, 0.5), 5) +
+						Math.pow(base(i, sampleRate, frequency, 1), 7)
+				)
+			) +
+				mod[8](
+					i,
+					sampleRate,
+					frequency,
+					base(i, sampleRate, frequency, 1.75)
+				)
+		);
+	}
+});
\ No newline at end of file
diff --git a/ajax/libs/audiosynth/LICENSE b/ajax/libs/audiosynth/LICENSE
new file mode 100644
index 000000000..3f58024f0
--- /dev/null
+++ b/ajax/libs/audiosynth/LICENSE
@@ -0,0 +1,20 @@
+The MIT License (MIT)
+
+Copyright (c) 2013 Keith William Horwood
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
\ No newline at end of file
diff --git a/ajax/libs/audiosynth/package.json b/ajax/libs/audiosynth/package.json
new file mode 100644
index 000000000..23e3ed8f2
--- /dev/null
+++ b/ajax/libs/audiosynth/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "audiosynth",
+  "filename": "audiosynth.js",
+  "version": "1.0.0",
+  "description": "Dynamic waveform audio synthesizer, written in Javascript. Generate musical notes dynamically and play them in your browser using the HTML5 Audio Element.",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/keithwhor/audiosynth"
+  },
+  "keywords": [
+    "audiosynth",
+    "audio",
+    "synthesizer",
+    "waveform"
+  ],
+  "author": "Keith Horwood",
+  "homepage": "http://keithwhor.github.io/audiosynth/",
+  "license": "MIT"
+}
\ No newline at end of file