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maxim.js
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maxim.js
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var mtof = [0, 8.661957, 9.177024, 9.722718, 10.3, 10.913383, 11.562325, 12.25, 12.978271, 13.75, 14.567617, 15.433853, 16.351599, 17.323914, 18.354048, 19.445436, 20.601723, 21.826765, 23.124651, 24.5, 25.956543, 27.5, 29.135235, 30.867706, 32.703197, 34.647827, 36.708096, 38.890873, 41.203445, 43.65353, 46.249302, 49., 51.913086, 55., 58.27047, 61.735413, 65.406395, 69.295654, 73.416191, 77.781746, 82.406891, 87.30706, 92.498604, 97.998856, 103.826172, 110., 116.540939, 123.470825, 130.81279, 138.591309, 146.832382, 155.563492, 164.813782, 174.61412, 184.997208, 195.997711, 207.652344, 220., 233.081879, 246.94165, 261.62558, 277.182617, 293.664764, 311.126984, 329.627563, 349.228241, 369.994415, 391.995422, 415.304688, 440., 466.163757, 493.883301, 523.25116, 554.365234, 587.329529, 622.253967, 659.255127, 698.456482, 739.988831, 783.990845, 830.609375, 880., 932.327515, 987.766602, 1046.502319, 1108.730469, 1174.659058, 1244.507935, 1318.510254, 1396.912964, 1479.977661, 1567.981689, 1661.21875, 1760., 1864.655029, 1975.533203, 2093.004639, 2217.460938, 2349.318115, 2489.015869, 2637.020508, 2793.825928, 2959.955322, 3135.963379, 3322.4375, 3520., 3729.31, 3951.066406, 4186.009277, 4434.921875, 4698.63623, 4978.031738, 5274.041016, 5587.651855, 5919.910645, 6271.926758, 6644.875, 7040., 7458.620117, 7902.132812, 8372.018555, 8869.84375, 9397.272461, 9956.063477, 10548.082031, 11175.303711, 11839.821289, 12543.853516, 13289.75];
var context = new webkitAudioContext();
function Maxim(t) {
this.loadFile = function(filename) {
var audio = new XMLHttpRequest();
var source = null;
var myAudioBuffer = null;
var playing=false;
var isLooping=false;
var startTime=0;
var endTime = 0;
var currentSpeed = 1.0;
var sampleLength = 1.0;
var volume = 1.0;
var gainNode = null;
var filter = null;
var analyser = null;
var analysing = true;
var attack = 0;
var release = 0;
var envTime = 0;
var flux = 0;
var averageSpectrumPower = 0;
var FFTData = null;
audio.open('GET', filename, true);
audio.responseType = 'arraybuffer';
audio.onload = function() {
// alert("sound loaded"); //test
context.decodeAudioData(audio.response, function(buffer) {
myAudioBuffer = buffer;
// alert("sound decoded"); //test
source = context.createBufferSource();
gainNode = context.createGainNode();
filter = context.createBiquadFilter();
analyser = context.createAnalyser();
filter.type = 0;
filter.frequency.value = 20000;
envTime = 1.0;
source.buffer = myAudioBuffer;
source.playbackRate.value = currentSpeed;
source.connect(filter);
filter.connect(gainNode);
gainNode.gain.value = volume;
gainNode.connect(context.destination);
sampleLength = source.buffer.duration*1000;
}
);
}
audio.send();
audio.isPlaying = function() {
return playing;
}
audio.setLooping = function(t) {
isLooping=t;
}
audio.cue = function(time) {
startTime=time/1000;
}
audio.speed = function(speed) {
if (source) {
currentSpeed = speed;
source.playbackRate.value = speed;
}
}
audio.getLengthMs = function() {
if (source) {
// alert(source.buffer.duration*1000);
return sampleLength;
}
}
audio.volume = function(gain) {
volume=gain;
if (playing) {
gainNode.gain.value = volume;
}
}
audio.play = function() {
if (source) {
if (!playing) {
source = context.createBufferSource();
gainNode = context.createGainNode()
filter = context.createBiquadFilter();
filter.type = 0;
filter.frequency.value = 20000;
envTime = 1.0;
source.buffer = myAudioBuffer;
source.playbackRate.value = currentSpeed;
sampleLength = source.buffer.duration*1000;
source.connect(filter);
filter.connect(gainNode);
gainNode.connect(context.destination);
gainNode.gain.value = volume;
// alert("source connected"); //test
if (isLooping) source.loop = true;
// source.loopStart = startTime/1000;
// source.loopEnd = source.buffer.duration;
source.noteGrainOn(0, startTime, source.buffer.duration-startTime);
playing=true;
}
if (analysing==true) {
gainNode.connect(analyser);
FFTData = new Float32Array(analyser.frequencyBinCount);
analyser.getFloatFrequencyData(FFTData);
}
}
}
audio.stop = function() {
if (source) {
source.noteOff(0);
playing=false;
}
}
audio.setFilter = function(freq, res) {
filter.frequency.value = freq;
filter.Q.value = res;
}
audio.filterRamp = function(freq, envTime) {
filter.frequency.cancelScheduledValues(context.currentTime);
filter.frequency.linearRampToValueAtTime(filter.frequency.value, context.currentTime); // THIS IS THE CHANGE FROM PREVIOUS CODE EXAMPLE
filter.frequency.linearRampToValueAtTime(freq, context.currentTime + envTime/1000.);
}
//This function allows you to set the amplitude of the waveform
audio.setAmplitude = function(amplitude) {
gainNode.gain.cancelScheduledValues(context.currentTime);
gainNode.gain.linearRampToValueAtTime(gainNode.gain.value, context.currentTime);
gainNode.gain.linearRampToValueAtTime(amplitude, context.currentTime + 10);
}
audio.ramp = function(amplitude, envTime) {
gainNode.gain.cancelScheduledValues(context.currentTime);
gainNode.gain.linearRampToValueAtTime(gainNode.gain.value, context.currentTime);
gainNode.gain.linearRampToValueAtTime(amplitude, context.currentTime + envTime/1000.);
}
audio.getAveragePower = function() {
averageSpectrumPower = 0
for (var i=0;i<analyser.frequencyBinCount;i++) {
averageSpectrumPower+=FFTData[i]
}
return (100+(averageSpectrumPower/analyser.frequencyBinCount))*0.01;
}
audio.getFlux = function() {
flux=0;
var FFTData1 = new Float32Array(analyser.frequencyBinCount);
for (var i=0;i<analyser.frequencyBinCount;i++) {
flux+=FFTData[i]-FFTData1[i];
}
FFTData1=FFTData;
return (100+(flux/analyser.frequencyBinCount))*0.01;
}
return audio;
}
}
//This is the constructor for our waveform generator.
Synth = function() {
var that = this;
this.phase = 0;
this.context = context;
this.node = context.createJavaScriptNode(512, 2, 2);
this.node.onaudioprocess = function(audioContext) {
that.process(audioContext)
};
this.sample_rate = 44100;
this.frequency = 220;
this.amplitude = 1.0;
this.gainNode = context.createGainNode();
this.delayGain = context.createGainNode();
this.filter = context.createBiquadFilter();
this.delay = context.createDelayNode(2);
this.delayAmt = 0.75;
this.delayGain.gain.value = 0.75;
this.filter.type = 0;
this.envTime = 1.0;
this.isPlaying = false;
this.waveFormSize = 514;
this.wave = new Array(this.waveFormSize);
for (var i = 0; i < this.waveFormSize + 1 ; i++) {
this.wave[i]=Math.sin(i/(this.waveFormSize-2) * (Math.PI * 2));
}
}
Synth.prototype.waveTableSize = function(size) {
this.waveFormSize=size;
}
Synth.prototype.loadWaveTable = function(waveTable) {
for (var i = 0; i < this.waveFormSize ; i++) {
this.wave[i] = waveTable[i];
}
// alert("all done");
}
//This function is the waveform generator's buffer method
//Hack here to create new waveforms
Synth.prototype.process = function(audioContext) {
var data = audioContext.outputBuffer.getChannelData(0);
for (var i = 0; i < data.length; i++) {
var remainder;
this.phase += (this.waveFormSize-2) / (this.sample_rate / this.frequency);
if (this.phase >= (this.waveFormSize-3) ) this.phase -= (this.waveFormSize-2) ;
remainder = this.phase - Math.floor(this.phase);
data[i]=(1-remainder) * this.wave[1+Math.floor(this.phase)] + remainder * this.wave[2+Math.floor(this.phase)];
}
// console.log('data = ' + this.frequency);
}
//This function allows you to 'play' the waveform
Synth.prototype.play = function() {
this.node.connect(this.filter);
this.filter.connect(this.gainNode);
this.gainNode.connect(this.context.destination);
this.gainNode.connect(this.delay);
this.delay.connect(this.delayGain);
this.delayGain.connect(this.delay);
this.delay.connect(this.context.destination);
this.isPlaying=true;
}
//This function allows you to set the frequency of the waveform
Synth.prototype.setFrequency = function(frequency) {
this.frequency = frequency;
}
//This function allows you to set the amplitude of the waveform
Synth.prototype.setAmplitude = function(amplitude) {
this.gainNode.gain.cancelScheduledValues(context.currentTime);
this.gainNode.gain.linearRampToValueAtTime(this.gainNode.gain.value, context.currentTime);
this.gainNode.gain.linearRampToValueAtTime(amplitude, context.currentTime + 10);
}
Synth.prototype.ramp = function(amplitude, envTime) {
this.gainNode.gain.cancelScheduledValues(context.currentTime);
this.gainNode.gain.linearRampToValueAtTime(this.gainNode.gain.value, context.currentTime);
this.gainNode.gain.linearRampToValueAtTime(amplitude, context.currentTime + envTime/1000.);
}
//This allows us to stop the waveform generator
Synth.prototype.stop = function() {
this.node.disconnect();
this.isPlaying=false;
}
Synth.prototype.setDelayTime = function(t) {
this.delay.delayTime.value = t;
}
Synth.prototype.setDelayAmount = function(t) {
this.delayGain.gain.value = t;
// this.delayGain.gain.cancelScheduledValues(context.currentTime);
// this.delayGain.gain.linearRampToValueAtTime(this.delayGain.gain.value, context.currentTime);
// this.delayGain.gain.linearRampToValueAtTime(this.delayGain.gain.value, context.currentTime,100);
}
Synth.prototype.setFilter = function(freq, res) {
this.filter.frequency.value = freq;
this.filter.Q.value = res;
}
Synth.prototype.filterRamp = function(freq, envTime) {
this.filter.frequency.cancelScheduledValues(context.currentTime);
this.filter.frequency.linearRampToValueAtTime(this.filter.frequency.value, context.currentTime); // THIS IS THE CHANGE FROM PREVIOUS CODE EXAMPLE
this.filter.frequency.linearRampToValueAtTime(freq, context.currentTime + envTime/1000.);
// this.filter.frequency.value = freq;
// this.filter.Q.value = res;
}