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<!DOCTYPE html>
<html>
<head>
<!-- Load JQuery and JQuery-UI -->
<link type="text/css" href="css/hot-sneaks/jquery-ui-1.8.custom.css" rel="stylesheet" />
<script type="text/javascript" src="js/jquery-1.4.2.min.js"></script>
<script type="text/javascript" src="js/jquery-ui-1.8.custom.min.js"></script>
<!-- Load Processing.js -->
<script language="javascript" src="js/processing.js"></script>
<script language="javascript" src="js/init.js"></script>
<!-- Load DSP.js -->
<script src="../dsp.js"></script>
<script>
</script>
<style type="text/css">
</style>
</head>
<body>
<script>
// Setup shared variables
var sampleRate = 44100;
var bufferSize = 1024;
var bufferTime = Math.floor(1000 / (sampleRate / bufferSize));
var amplitude = 0.1; // Default amplitude at 70%
var oct = 3; // Root Octave
var oscs = [];
var noteOn = [];
var playSample = false;
// Borrowed from F1LTER's code
var midiNoteFreq = [ 16.35, 17.32, 18.35, 19.45, 20.6, 21.83, 23.12, 24.5, 25.96, 27.5, 29.14, 30.87,
32.7, 34.65, 36.71, 38.89, 41.2, 43.65, 46.25, 49, 51.91, 55, 58.27, 61.74,
65.41, 69.3, 73.42, 77.78, 82.41, 87.31, 92.5, 98, 103.83, 110, 116.54, 123.47,
130.81, 138.59, 146.83, 155.56, 164.81, 174.61, 185, 196, 207.65, 220, 233.08, 246.94,
261.63, 277.18, 293.66, 311.13, 329.63, 349.23, 369.99, 392, 415.3, 440, 466.16, 493.88,
523.25, 554.37, 587.33, 622.25, 659.26, 698.46, 739.99, 783.99, 830.61, 880, 932.33, 987.77,
1046.5, 1108.73, 1174.66, 1244.51, 1318.51, 1396.91, 1479.98, 1567.98, 1661.22, 1760, 1864.66, 1975.53,
2093, 2217.46, 2349.32, 2489.02, 2637.02, 2793.83, 2959.96, 3135.96, 3322.44, 3520, 3729.31, 3951.07,
4186.01, 4434.92, 4698.64, 4978 ];
var silence = new Float32Array(bufferSize);
// Setup audio channel
var output = new Audio();
if ( typeof output.mozSetup === 'function' ) {
output.mozSetup(1, sampleRate);
}
var programStart;
var writeCount = 0;
var s = new Sampler('audio/intergalactic.ogg', bufferSize, sampleRate);
s.envelope = new ADSR(0, 0, 1, Infinity, 0, sampleRate);
s.envelope.disable(); // turn off so it does not auto trigger
var audioWriter = function() {
if (s.loaded) {
if ( programStart === undefined ) {
programStart = new Date();
}
while ( (new Date() - programStart) / 1000 * sampleRate / bufferSize >= writeCount ) {
var additiveSignal;
if ( s.envelope.isActive() ) {
s.generate();
additiveSignal = s.applyEnvelope();
}
/*
// This makes it fall out of sync for some reason.
if ( typeof additiveSignal === 'undefined' ) {
additiveSignal = silence;
}
*/
// Flush buffer
output.mozWriteAudio([]);
if (additiveSignal) {
// Write next audio frame
output.mozWriteAudio(additiveSignal);
}
writeCount++;
}
}
}
$(function() {
$('#loop_mode').change(changeLoopMode);
changeLoopMode(); // reset to default value
});
var changeLoopMode = function() {
s.loopMode = parseInt($('#loop_mode').val());
};
</script>
<script target="#keyboard" type="application/processing">
void setup() {
size(1024, 200);
setInterval(audioWriter, bufferTime); // start audioWriter timer
stroke(255);
frameRate(20);
}
void draw() {
background(255);
fill(0)
stroke(255);
if ( s.loaded ) {
if ( s.envelope.isActive() ) {
} else {
s.reset();
}
text("Sample Loaded. Octave: " + oct, 0, 20);
} else {
var loadPercent = s.samples.length / (s.duration * sampleRate);
text("Loading: " + Math.round(loadPercent * 100) + "%", 0, 20);
//var step = s.samples.length / width;
var step = Math.floor(s.duration * sampleRate / width);
noStroke();
stroke(0, 100);
fill(0, 50);
/*
beginShape();
for ( int i = 0; i < Math.floor(s.samples.length/step); i++) {
if (s.samples[i*step] > 0) {
vertex(i + width - s.samples.length/step, height/2 - s.samples[i*step] * 100);
}
}
for ( int i = Math.floor(s.samples.length/step) -1; i > -1; i--) {
if (s.samples[i*step] > 0) {
vertex(i + width - s.samples.length/step, height/2 - -s.samples[i*step] * 100);
}
}
endShape();
*/
}
if ( s.loaded ) {
var step = s.samples.length / width;
if (s.playStart > s.playEnd) {
s.playEnd = s.playStart;
}
var playStartPos = Math.floor(s.playStart * s.samples.length / step);
var playEndPos = Math.floor(s.playEnd * s.samples.length / step);
var sampleEndPos = Math.floor(s.samples.length / step);
if (playStartPos) {
stroke(0, 100);
fill(0, 50);
beginShape();
for ( int i = 0; i < playStartPos; i++) {
if (s.samples[i*step] > 0) {
vertex(i, height/2 - s.samples[i*step] * 100);
}
}
for ( int i = playStartPos -1; i >= 0; i--) {
if (s.samples[i*step] > 0) {
vertex(i, height/2 - -s.samples[i*step] * 100);
}
}
endShape();
}
if (playStartPos - playEndPos) {
stroke(255, 0, 0, 100);
fill(255, 0, 0, 50);
beginShape();
for ( int i = playStartPos; i < playEndPos; i++) {
if (s.samples[i*step] > 0) {
vertex(i, height/2 - s.samples[i*step] * 100);
}
}
for ( int i = playEndPos -1; i >= playStartPos; i--) {
if (s.samples[i*step] > 0) {
vertex(i, height/2 - -s.samples[i*step] * 100);
}
}
endShape();
}
if (playEndPos < sampleEndPos) {
stroke(0, 100);
fill(0, 50);
beginShape();
for ( int i = playEndPos; i < sampleEndPos; i++) {
if (s.samples[i*step] > 0) {
vertex(i, height/2 - s.samples[i*step] * 100);
}
}
for ( int i = sampleEndPos -1; i >= playEndPos; i--) {
if (s.samples[i*step] > 0) {
vertex(i, height/2 - -s.samples[i*step] * 100);
}
}
endShape();
}
// DRAW PLAY POSITION
stroke(0);
var pos = s.playhead / step;
if (pos >= playStartPos && pos <= playEndPos) {
line(pos, 0, pos, height);
}
stroke(255, 0, 0);
line(s.playStart * width, 0, s.playStart * width, height);
line(s.playEnd * width, 0, s.playEnd * width, height);
}
}
void keyPressed() {
var semi = undefined;
if ( key == 'z' ) { // C
semi = 0;
}
if ( key == 's' ) { // C#
semi = 1;
}
if ( key == 'x' ) { // D
semi = 2;
}
if ( key == 'd' ) { // D#
semi = 3;
}
if ( key == 'c' ) { // E
semi = 4;
}
if ( key == 'v' ) { // F
semi = 5;
}
if ( key == 'g' ) { // F#
semi = 6;
}
if ( key == 'b' ) { // G
semi = 7;
}
if ( key == 'h' ) { // G#
semi = 8;
}
if ( key == 'n' ) { // A
semi = 9;
}
if ( key == 'j' ) { // A#
semi = 10;
}
if ( key == 'm' ) { // B
semi = 11;
}
if ( key == '=') { // increase octave
oct++;
}
if ( key == '-') { // descrease octave
oct--;
}
if (typeof semi !== 'undefined' && s.loaded) {
s.envelope.noteOn();
s.setFreq(midiNoteFreq[12*oct+semi]);
}
}
void keyReleased() {
if ( s.envelope.isActive() ) {
s.envelope.noteOff();
}
}
void mouseClicked() {
if (mouseButton == LEFT) {
s.playStart = mouseX / width;
}
if (mouseButton == RIGHT) {
s.playEnd = mouseX / width;
}
}
</script>
<!--<audio id='input' tabindex="0" src="audio/chord.ogg" controls="true" onaudiowritten="audioWritten(event);" style="width: 512px;"></audio>-->
<h1>Sampler</h1>
<canvas id="keyboard" width="200px" height="200px"></canvas>
<div>
<b>Loop Mode:</b>
<select id="loop_mode">
<option value="0" selected="selected">Off</option>
<option value="1">FW</option>
<option value="2">BW</option>
<option value="3">FW-BW</option>
</select>
<div>
<h2>Playing sample</h2>
<p>Bottom row keys z to m are the white keys of one octave of a piano.</p>
<p>Middle row keys s,d and g,h,j are the black keys of one octave of a piano</p>
<p>- and = decrease or increase the octave</p>
<h2>Setting play start and end region</h2>
<p>Clicking on the sample with the left button will set the start pos and the right will set the end pos</p>
</body>
</html>