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dj-test.html
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<!--
Copyright 2010, 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>
<!-- Slider stuff -->
<script type="text/javascript" src="lib/events.js"></script>
<style type="text/css">
#slider { margin: 10px; }
</style>
<link rel="stylesheet" type="text/css" href = "style/simple.css" />
<!-- Our javascript code -->
<script type="text/javascript">
// Events
// init() once the page has finished loading.
window.onload = init;
var context;
var source1 = 0;
var source2 = 0;
var source1Gain = 0;
var source2Gain = 0;
var buffer;
var convolver;
var compressor;
var panner;
var wetGainNode1;
var wetGainNode2;
var lowFilter1;
var lowFilter2;
var bufferLoader1 = 0;
var bufferLoader2 = 0;
var loadCount = 0;
var tempo = 120.0; // hardcoded for now
function highlightElement(object) {
if (hilightedElement) hilightedElement.style.backgroundColor = "white";
hilightedElement = object;
object.style.backgroundColor = "green";
}
/**
* Class BufferLoader
*/
BufferLoader = function(source, url) {
this.source_ = source;
this.url_ = url;
this.buffer_ = 0;
this.request_ = 0;
}
BufferLoader.prototype.load = function() {
// Load asynchronously
var request = new XMLHttpRequest();
request.open("GET", this.url_, true);
request.responseType = "arraybuffer";
this.request_ = request;
var bufferLoader = this;
request.onload = function() {
bufferLoader.buffer = context.createBuffer(request.response, false);
bufferLoader.source_.buffer = bufferLoader.buffer;
loadCount++;
if (loadCount == 2) finishLoad();
}
request.send();
}
function crossfadeHandler(event, ui) {
var x = ui.value;
var gain1 = 0.5 * (1.0 + Math.cos(x * Math.PI));
var gain2 = 0.5 * (1.0 + Math.cos((1.0-x) * Math.PI));
source1Gain.gain.value = gain1;
source2Gain.gain.value = gain2;
var info = document.getElementById("crossfade-value");
info.innerHTML = "crossfade = " + x;
}
function leftFilterHandler(event, ui) {
var value = ui.value;
var sampleRate = 44100.0; // !!@@ don't hardcode
var nyquist = sampleRate * 0.5;
var noctaves = Math.log(nyquist / 40.0) / Math.LN2;
var v2 = Math.pow(2.0, noctaves * (value - 1.0));
var cutoff = v2*nyquist;
var info = document.getElementById("leftFilter-value");
info.innerHTML = "leftFilter = " + cutoff + " Hz";
lowFilter1.cutoff.value = cutoff;
}
function rightFilterHandler(event, ui) {
var value = ui.value;
var sampleRate = 44100.0; // !!@@ don't hardcode
var nyquist = sampleRate * 0.5;
var noctaves = Math.log(nyquist / 40.0) / Math.LN2;
var v2 = Math.pow(2.0, noctaves * (value - 1.0));
var cutoff = v2*nyquist;
var info = document.getElementById("rightFilter-value");
info.innerHTML = "rightFilter = " + cutoff + " Hz";
lowFilter2.cutoff.value = cutoff;
}
function leftRhythmEffectHandler(event, ui) {
var value = ui.value;
var info = document.getElementById("leftRhythmEffect-value");
info.innerHTML = "leftRhythmEffect = " + 100.0*value + "\%";
wetGainNode1.gain.value = value;
}
function rightRhythmEffectHandler(event, ui) {
var value = ui.value;
var info = document.getElementById("rightRhythmEffect-value");
info.innerHTML = "rightRhythmEffect = " + 100.0*value + "\%";
wetGainNode2.gain.value = value;
}
function finishLoad() {
// first, get rid of loading animation
var loading = document.getElementById("loading");
loading.innerHTML = "";
addSlider("crossfade");
addSlider("leftFilter");
addSlider("rightFilter");
addSlider("leftRhythmEffect");
addSlider("rightRhythmEffect");
configureSlider("crossfade", 0.5, 0.0, 1.0, crossfadeHandler);
configureSlider("leftFilter", 0.99, 0.0, 1.0, leftFilterHandler);
configureSlider("rightFilter", 0.99, 0.0, 1.0, rightFilterHandler);
configureSlider("leftRhythmEffect", 0.0, 0.0, 1.0, leftRhythmEffectHandler);
configureSlider("rightRhythmEffect", 0.0, 0.0, 1.0, rightRhythmEffectHandler);
var now = context.currentTime;
anchorTime = now + 0.040;
source1.noteOn(anchorTime);
source2.noteOn(anchorTime);
}
function setReverbImpulseResponse(url) {
// Load impulse response asynchronously
var request = new XMLHttpRequest();
request.open("GET", url, true);
request.responseType = "arraybuffer";
request.onload = function() {
convolver.buffer = context.createBuffer(request.response, false);
}
request.send();
}
function loadBufferForSource(source, url) {
// Load asynchronously
var request = new XMLHttpRequest();
request.open("GET", url, true);
request.responseType = "arraybuffer";
request.onload = function() {
// Start playing the new buffer at exactly the next 4-beat boundary
var currentTime = context.currentTime;
// Add 120ms slop since we don't want to schedule too soon into the future.
// This will potentially cause us to wait 4 more beats, if we're almost exactly at the next 4-beat transition.
currentTime += 0.120;
var delta = currentTime - anchorTime;
var deltaBeat = (tempo / 60.0) * delta;
var roundedUpDeltaBeat = 4.0 + 4.0 * Math.floor(deltaBeat / 4.0);
var roundedUpDeltaTime = (60.0 / tempo) * roundedUpDeltaBeat;
var time = anchorTime + roundedUpDeltaTime;
// Stop the current loop (when it gets to the next 4-beat boundary).
source.noteOff(time);
// Create a new source.
var newSource = context.createBufferSource();
if (source == source1)
newSource.connect(source1Gain);
else if (source == source2)
newSource.connect(source2Gain);
// Assign the buffer to the new source.
newSource.buffer = context.createBuffer(request.response, false);
// Start playing exactly on the next 4-beat boundary with looping.
newSource.loop = true;
newSource.noteOn(time);
// This new source will replace the existing source.
if (source == source1)
source1 = newSource;
else if (source == source2)
source2 = newSource;
}
request.send();
}
function init() {
// Initialize audio
context = new AudioContext();
if (context.createDynamicsCompressor) {
// Create dynamics compressor to sweeten the overall mix.
compressor = context.createDynamicsCompressor();
compressor.connect(context.destination);
} else {
// Compressor is not available on this implementation - bypass and simply point to destination.
compressor = context.destination;
}
// Create sources
source1 = context.createBufferSource();
source2 = context.createBufferSource();
// Create gain nodes to control the volume for the two sources.
source1Gain = context.createGainNode();
source2Gain = context.createGainNode();
// Create gain nodes to control the wet (effect) mix levels for left/right
wetGainNode1 = context.createGainNode();
wetGainNode2 = context.createGainNode();
wetGainNode1.gain.value = 0.0;
wetGainNode2.gain.value = 0.0;
// Create a lowpass resonant filter for both left and right
lowFilter1 = context.createLowPass2Filter();
lowFilter2 = context.createLowPass2Filter();
lowFilter1.cutoff.value = 22050.0;
lowFilter2.cutoff.value = 22050.0;
lowFilter1.resonance.value = 5.0;
lowFilter2.resonance.value = 5.0;
// Create a convolver for a rhythm effect
convolver = context.createConvolver();
// Connect sources to gain and filter nodes.
source1.connect(source1Gain);
source2.connect(source2Gain);
source1Gain.connect(lowFilter1);
source2Gain.connect(lowFilter2);
// Connect dry mix
lowFilter1.connect(compressor);
lowFilter2.connect(compressor);
// Connect wet (effect) mix
lowFilter1.connect(wetGainNode1);
wetGainNode1.connect(convolver);
lowFilter2.connect(wetGainNode2);
wetGainNode2.connect(convolver);
convolver.connect(compressor);
// Start out with cross-fader at center position (equal-power crossfader)
source1Gain.gain.value = 0.707;
source2Gain.gain.value = 0.707;
source1.loop = true;
source2.loop = true;
// load reverb
// setReverbImpulseResponse('impulse-responses/spatialized3.wav');
setReverbImpulseResponse('impulse-responses/filter-rhythm2.wav');
bufferLoader1 = new BufferLoader(source1, "sounds/drum-samples/loops/blueyellow.wav");
bufferLoader2 = new BufferLoader(source2, "sounds/drum-samples/loops/break29.wav");
bufferLoader1.load();
bufferLoader2.load();
}
</script>
</head>
<body>
<!-- Sliders and other controls will be added here -->
<div id="controls"> </div>
<!-- Initial loading animation -->
<div id="loading">
<img src="images/loading.gif" width="400" height="400">
</div>
<div style="position:relative; height:350px; width:800px;">
<div style="position:absolute; top:0; left:0; width:200px;">
<!-- Left "turntable" -->
<h2>Left</h2>
<div class='bigList' onmousedown="loadBufferForSource(source1, 'sounds/drum-samples/loops/blueyellow.wav'); highlightElement(this);">
blueyellow
</div>
<div class='bigList' onmousedown="loadBufferForSource(source1, 'sounds/drum-samples/loops/break12.wav'); highlightElement(this);">
break12
</div>
<div class='bigList' onmousedown="loadBufferForSource(source1, 'sounds/drum-samples/loops/break28.wav'); highlightElement(this);">
break28
</div>
<div class='bigList' onmousedown="loadBufferForSource(source1, 'sounds/drum-samples/loops/break29.wav'); highlightElement(this);">
break29
</div>
</div>
<div style="position:absolute; top:0; left:400px; width:200px;">
<!-- Right "turntable" -->
<h2>Right</h2>
<div class='bigList' onmousedown="loadBufferForSource(source2, 'sounds/drum-samples/loops/blueyellow.wav'); highlightElement(this);">
blueyellow
</div>
<div class='bigList' onmousedown="loadBufferForSource(source2, 'sounds/drum-samples/loops/break12.wav'); highlightElement(this);">
break12
</div>
<div class='bigList' onmousedown="loadBufferForSource(source2, 'sounds/drum-samples/loops/break28.wav'); highlightElement(this);">
break28
</div>
<div class='bigList' onmousedown="loadBufferForSource(source2, 'sounds/drum-samples/loops/break29.wav'); highlightElement(this);">
break29
</div>
</div>
</body>
</html>