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loop.html
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<!--
Copyright 2012, Google Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-->
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>
Title
</title>
<link rel="stylesheet" type="text/css" href = "style/simple.css" />
<!-- Slider stuff -->
<script type="text/javascript" src="lib/events.js"></script>
<script type="text/javascript" src="lib/knob.js"></script>
<script type="text/javascript" src="lib/granular.js"></script>
<script type="text/javascript" src="lib/global-effects.js"></script>
<script type="text/javascript" src="lib/bpm-delay.js"></script>
<script type="text/javascript" src="lib/waveshaper.js"></script>
<script type="text/javascript" src="lib/buffer-loader.js"></script>
<style type="text/css">
#slider { margin: 10px; }
</style>
<script type="text/javascript">
window.onload = init;
var useLiveInput = false;
var useTestInput = false;
var backgroundColor = "rgb(0, 0, 0)";
var curveColor1 = "rgb(192,192,192)";
var curveColor2 = "rgb(255,100,255)";
var gridColor = "rgb(200,200,200)";
var context;
var globalEffects;
var source;
var delay;
var gain;
var muted = false;
var sourceBuffer;
var recording = false;
var startRecordTime = 0;
var duration = 0;
var loopSource = 0;
var liveInput;
var loopIndex = 0;
var loops = new Array();
var bufferLoader;
var bufferList;
function schedule() {
for (var i = 0; i < 4; ++i) {
loops[i].schedule();
}
setTimeout("schedule()", 20);
}
function setSpeed(value) {
for (var i = 0; i < 4; ++i) {
loops[i].granular.setSpeed(value);
}
setTempo(bufferList[0].duration * Math.abs(value));
}
function selectedLoop() {
return loops[loopIndex];
}
function setTempo(duration) {
// Simplistically assume loop is 4 beats.
var tempo = 60 / (0.25 * duration);
if (Math.abs(tempo) < 5 || Math.abs(tempo) > 1000 || tempo < 0)
tempo = 120;
while (tempo < 80)
tempo *= 2;
while (tempo > 180)
tempo /= 2;
// var info = document.getElementById('info');
// info.innerHTML = "duration: " + duration + " bpm: " + tempo;
// globalEffects.bpmDelay.setTempo(tempo);
}
function handleKeyDown(event) {
console.log(event.keyCode);
var code = event.keyCode;
if (code == 77) {
// m
selectedLoop().mute();
} else if (code == 13) {
// Return
if (!recording) {
startRecordTime = context.currentTime;
recording = true;
} else {
var startTime = startRecordTime;
var endTime = context.currentTime;
// Use retro-record after loop time is established
if (duration == 0) {
duration = endTime - startTime;
setTempo(duration);
}
else
startTime = endTime - duration;
var captureBuffer = delay.createBuffer(startTime, duration);
var p = captureBuffer.getChannelData(0);
console.log(p[0]);
console.log(p[1]);
console.log(p[2]);
console.log(p[3]);
muteSource();
selectedLoop().clear();
selectedLoop().setBuffer(captureBuffer);
selectedLoop().loop();
// recording = false;
}
} else if (code == 80) {
// p
selectedLoop().audition();
} else if (code == 67) {
// c
selectedLoop().clear();
} else if (code == 90) {
// z
clearAll();
} else if (code == 32) {
// Space
toggleMuteSource();
} else if (code >= 49 && code <=57) {
// 1,2,3,4,5,6,7,8
var i = code - 49;
selectedLoop().setBuffer(bufferList[i]);
}
}
function Loop(context, globalEffects) {
this.context = context;
this.source = 0;
this.buffer = 0;
this.muted = false;
this.gain = context.createGain();
this.filter = context.createBiquadFilter();
this.filter.type = this.filter.LOWPASS;
this.filter.frequency.value = 24000;
this.filter.Q.value = 6; // dB
this.filter2 = context.createBiquadFilter();
this.filter2.type = this.filter.LOWPASS;
this.filter2.frequency.value = 24000;
this.filter2.Q.value = 0; // dB
this.filterGain = context.createGain();
this.filter.connect(this.filter2);
this.filter2.connect(this.filterGain);
this.filterGain.connect(this.gain);
this.delayDry = context.createGainNode();
this.delayWet = context.createGainNode();
this.convolverDry = context.createGainNode();
this.convolverWet = context.createGainNode();
this.delayDry.connect(globalEffects.compressor);
this.convolverDry.connect(globalEffects.compressor);
this.delayWet.connect(globalEffects.bpmDelay.delay);
this.convolverWet.connect(globalEffects.convolver);
this.gain.connect(this.delayDry);
this.gain.connect(this.delayWet);
this.gain.connect(this.convolverDry);
this.gain.connect(this.convolverWet);
this.setDelayDryWet(0.3);
this.setReverbDryWet(0.0);
this.setResonance(3);
this.granular = new Granular(context, this.filter /*globalEffects.compressor*/, globalEffects.convolver);
}
Loop.prototype.schedule = function() {
if (this.buffer)
this.granular.schedule();
}
Loop.prototype.setBuffer = function(buffer) {
this.buffer = buffer;
this.granular.setBuffer(buffer);
}
Loop.prototype.setVolume = function(value) {
this.gain.gain.value = value;
}
Loop.prototype.setCutoff = function(value) {
this.filter.frequency.value = value;
this.filter2.frequency.value = value;
}
Loop.prototype.setResonance = function(value) {
// this.filter.Q.value = value;
// var gainCompDb = -0.25 * value; // gain compensation for resonance (empirical)
// var gainComp = Math.pow(10, gainCompDb/20);
// this.filterGain.gain.value = gainComp;
this.filter.Q.value = value;
this.filter2.Q.value = value - 6;
// Resonance gain compensation.
var gain = Math.pow(10, -0.25*value * 0.05);
this.filterGain.gain.value = gain;
}
Loop.prototype.loop = function() {
if (this.source)
this.source.stop(0);
var source = context.createBufferSource();
this.source = source;
source.buffer = this.buffer;
source.connect(this.filter);
source.loop = true;
source.start(0);
}
Loop.prototype.clear = function() {
if (this.source) {
this.source.stop(0);
this.source = 0;
}
}
Loop.prototype.audition = function() {
var playSource = context.createBufferSource();
playSource.buffer = this.buffer;
playSource.connect(context.destination);
playSource.start(0);
}
Loop.prototype.mute = function() {
var target = this.muted ? 1 : 0;
this.muted = !this.muted;
this.gain.gain.setTargetAtTime(target, 0, 0.010);
}
Loop.prototype.setDelayDryWet = function(x) {
// Equal-power cross-fade dry -> wet
var gain1 = 0.5 * (1.0 + Math.cos(x * Math.PI));
var gain2 = 0.5 * (1.0 + Math.cos((1.0-x) * Math.PI));
this.delayDry.gain.value = gain1;
this.delayWet.gain.value = gain2;
}
Loop.prototype.setReverbDryWet = function(x) {
// Equal-power cross-fade dry -> wet
var gain1 = 0.5 * (1.0 + Math.cos(x * Math.PI));
var gain2 = 0.5 * (1.0 + Math.cos((1.0-x) * Math.PI));
this.convolverDry.gain.value = gain1;
this.convolverWet.gain.value = gain2;
}
function muteSource() {
muted = true;
gain.gain.setTargetAtTime(0, 0, 0.010);
}
function toggleMuteSource() {
var target = muted ? 1 : 0;
muted = !muted;
gain.gain.setTargetAtTime(target, 0, 0.010);
}
function clearAll() {
recording = false;
startRecordTime = 0;
duration = 0;
for (var i = 0; i < 4; ++i) {
loops[i].clear();
}
}
function error() {
alert('Stream generation failed.');
}
function getUserMedia(dictionary, callback) {
try {
navigator.webkitGetUserMedia(dictionary, callback, error);
} catch (e) {
alert('webkitGetUserMedia threw exception :' + e);
}
}
function gotStream(stream) {
liveInput = context.createMediaStreamSource(stream);
liveInput.connect(delay);
liveInput.connect(context.destination);
}
function finishLoad() {
document.addEventListener("keydown", handleKeyDown, true);
}
function loadSourceBuffer(url) {
var request = new XMLHttpRequest();
request.open("GET", url, true);
request.responseType = "arraybuffer";
request.onload = function() {
if (!useLiveInput && useTestInput) {
var source = context.createBufferSource();
sourceBuffer = context.createBuffer(request.response, true);
source.buffer = sourceBuffer;
source.connect(delay);
source.start(0);
}
finishLoad();
}
request.send();
}
function bufferLoaderFinished(buffers) {
bufferList = buffers;
globalEffects.setConvolverBuffer(buffers[8]); // FIXME: fragile
loops[0].setBuffer(buffers[3]); // granular
loops[1].setBuffer(buffers[1]); // granular
}
function init() {
context = new AudioContext();
delay = context.createDelay(10);
gain = context.createGain();
delay.connect(gain);
gain.connect(context.destination);
globalEffects = new GlobalEffects(context);
globalEffects.setDelayFeedback(0.65);
globalEffects.setDelayGrunge(-3);
for (var i = 0; i < 4; ++i) {
loops[i] = new Loop(context, globalEffects);
}
// loadSourceBuffer("sounds/drum-samples/hihat-short.wav");
// loadSourceBuffer("sounds/hyper-reality/human-voice.mp4");
loadSourceBuffer("sounds/DriftingDrums.mp3");
bufferLoader = new BufferLoader(
context,
[
'sounds/drum-samples/loops/blueyellow.wav',
'sounds/drum-samples/loops/break12.wav',
'sounds/drum-samples/loops/break28.wav',
'sounds/drum-samples/loops/break29.wav',
'sounds/hyper-reality/refreshing-drink.wav',
'sounds/hyper-reality/human-voice.mp4',
'sounds/hyper-reality/guitar-chords.wav',
'sounds/drum-samples/loops/organ-echo-chords.wav',
'impulse-responses/matrix-reverb5.wav',
],
bufferLoaderFinished
);
bufferLoader.load();
if (useLiveInput) {
getUserMedia({audio:true}, gotStream);
}
drawAllLoops();
installGlobalControls();
installControls(0);
installControls(1);
installControls(2);
installControls(3);
globalEffects.bpmDelay.setDelayValue("quarter note");
// BPM delay time.
var bpmDelayMenu = document.getElementById("bpmDelayMenu");
var menuText = 'Delay: <select onchange="globalEffects.bpmDelay.setDelayValue(this.value);">'
menuText += '<option>32nd note</option>'
menuText += '<option>16th note triplet</option>'
menuText += '<option>dotted 32nd note</option>'
menuText += '<option>16th note</option>'
menuText += '<option>8th note triplet</option>'
menuText += '<option>dotted 16th note</option>'
menuText += '<option>8th note</option>'
menuText += '<option>quarter note triplet</option>'
menuText += '<option>dotted eighth note</option>'
menuText += '<option selected>quarter note</option>'
menuText += '</select>';
bpmDelayMenu.innerHTML = menuText;
schedule();
}
function drawLoop(index) {
var j = index + 1;
var id = "loop" + j;
var canvas = document.getElementById(id);
var width = canvas.width;
var height = canvas.height;
var cc = canvas.getContext('2d');
cc.fillStyle = backgroundColor;
cc.fillRect(0, 0, width, height);
if (index == loopIndex) {
cc.strokeStyle = curveColor2;
cc.lineWidth = 7;
} else {
cc.strokeStyle = backgroundColor;
cc.lineWidth = 1;
}
cc.strokeRect(0, 0, width, height);
}
function drawAllLoops() {
drawLoop(0);
drawLoop(1);
drawLoop(2);
drawLoop(3);
}
function installControls(index) {
var views = new Array();
var idx_plus = index + 1;
var j = 0;
views[j++] = new KnobView("cutoff " + idx_plus, 22000, 30, 24000, UNITS.hertz, 1, true, function(value) { loops[index].setCutoff(value); } );
views[j++] = new KnobView("resonance " + idx_plus, 5, 0, 20, UNITS.decibels, 0, false, function(value) { loops[index].setResonance(value); } );
views[j++] = new KnobView("reverb dry/wet " + idx_plus, 20, 0, 100, UNITS.percent, 1, false, function(value) { loops[index].setReverbDryWet(0.01 * value); } );
views[j++] = new KnobView("delay " + idx_plus, 25, 0, 100, UNITS.percent, 1, false, function(value) { loops[index].setDelayDryWet(0.01 * value); } );
// views[j++] = new KnobView("speed " + idx_plus, 0.3, -2, 2, UNITS.generic, 1, false, function(value) { loops[index].granular.setSpeed(value); } );
views[j++] = new KnobView("pitch " + idx_plus, 0, -1200, 1200, UNITS.cents, 1, false, function(value) { loops[index].granular.setPitch(value); } );
views[j++] = new KnobView("panning randomization " + idx_plus, 0.5, 0, 1, UNITS.generic, 1, false, function(value) { loops[index].granular.setPanningRandomization(value); } );
views[j++] = new KnobView("diffusion randomization " + idx_plus, 0.0, 0, 1, UNITS.generic, 1, false, function(value) { loops[index].granular.setDiffusionRandomization(value); } );
views[j++] = new KnobView("grain size " + idx_plus, 0.080, 0.020, 0.5, UNITS.seconds, 3, false, function(value) { loops[index].granular.setGrainSize(value); } );
views[j++] = new KnobView("volume " + idx_plus, 1, 0.0, 1.0, UNITS.generic, 1, false, function(value) { loops[index].setVolume(value); } );
var id = "loop-controls" + idx_plus;
var controls = document.getElementById(id);
installViews(views, controls);
}
function installGlobalControls() {
var views = new Array();
var j = 0;
views[j++] = new KnobView("speed", 1, -1, 1, UNITS.generic, 1, false, function(value) { setSpeed(value); } );
views[j++] = new KnobView("delay feedback", 50, 0, 100, UNITS.percent, 1, false, function(value) { globalEffects.setDelayFeedback(0.01 * value); } );
views[j++] = new KnobView("delay grunge", 0, -10, 30, UNITS.decibels, 1, false, function(value) { globalEffects.setDelayGrunge(value); } );
var controls = document.getElementById("global-controls");
installViews(views, controls);
}
function select(index) {
loopIndex = index;
drawAllLoops();
}
</script>
</head>
<body>
<canvas id="loop1" width="600px" height="50px" onmousedown="select(0);"></canvas>
<br>
<canvas id="loop2" width="600px" height="50px" onmousedown="select(1);"></canvas>
<br>
<canvas id="loop3" width="600px" height="50px" onmousedown="select(2);"></canvas>
<br>
<canvas id="loop4" width="600px" height="50px" onmousedown="select(3);"></canvas>
<br>
<div id="info"> </div>
<div id="bpmDelayMenu"> </div>
<br>
<div id="global-controls" style="position:relative; width:300px; height:90px;"> </div>
<div id="loop-controls1" style="position:relative; width:300px; height:260px;"> controls1</div>
<div id="loop-controls2" style="position:relative; width:300px; height:260px;"> controls2</div>
<div id="loop-controls3" style="position:relative; width:300px; height:260px;"> controls3</div>
<div id="loop-controls4" style="position:relative; width:300px; height:260px;"> controls4</div>
</body>
</html>