Audio
Processing and synthesizing
This is an example about processing and synthesizing audio:
<!DOCTYPE html>
<html>
<head>
<!-- This file belongs to a CrossBrowdy.com example, made by Joan Alba Maldonado. Creative Commons Attribution 4.0 International License. -->
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<link rel="canonical" href="https://crossbrowdy.com/examples/audio/processing_and_synthesizing/try" />
<title>Audio: Processing and synthesizing - Example</title>
<!-- Loads the needed CSS files: -->
<link rel="stylesheet" type="text/css" href="main.css" />
<!-- Loads CrossBrowdy.js (main file): -->
<!-- Note: it is recommended to download CrossBrowdy instead of hotlinking the online version. This is just for the example! -->
<script src="https://crossbrowdy.com/CrossBrowdy/CrossBrowdy.js" type="text/javascript" language="javascript"></script><!-- "type" and "language" parameters for legacy clients. -->
<!-- Loads the other needed script files: -->
<script src="main.js" type="text/javascript" language="javascript"></script>
</head>
<body>
<div id="messages">Loading...</div>
<button id="start_button" onClick="prepareTimbreJSObject();">
<span style="display:block; margin-top:10px;">Start!</span>
</button>
<!-- Using timbre.js library internally: https://mohayonao.github.io/timbre.js/ -->
<!-- Using subcollider.js library internally: https://mohayonao.github.io/subcollider/ -->
<span id="controls">
<button onClick="play();">Play</button>
<br />
<br />
You can read more about it in the <a href="https://mohayonao.github.io/timbre.js/" target="_blank">timbre.js library</a>
and the <a href="https://mohayonao.github.io/subcollider/" target="_blank">subcollider.js library</a> web sites.
</span>
<br />
<!-- The "CB_console" element will be used automatically in the case that the client does not support console: -->
<div id="CB_console" style="display:none; visibility:hidden; overflow:scroll;">
<span style="font-weight:bold;">Console:</span><br />
</div>
<div id="crossbrowdy_info"><a href="https://crossbrowdy.com/examples/audio/processing_and_synthesizing" target="_blank">CrossBrowdy.com example</a></div>
</body>
</html>
/* This file belongs to a CrossBrowdy.com example, made by Joan Alba Maldonado. Creative Commons Attribution 4.0 International License. */
body { background-color:#aaddee; word-wrap:break-word; }
#crossbrowdy_info { position:fixed; bottom:2px; right:2px; }
#crossbrowdy_info a { color:#00aadd; }
#crossbrowdy_info a:hover { color:#0033aa; }
span { color:#aa0000; }
button { color:#006600; }
button:hover { color:#660000; cursor:pointer; cursor:hand; }
#controls { display:none; visibility:hidden; text-align:center; }
#messages { text-align:center; color:#00aa00; font-weight:bold; }
#start_button
{
visibility: hidden;
display: none;
position:absolute;
left:25%;
top:25%;
width:50%;
height:50%;
color:#ff0000;
font-weight:bold;
cursor:pointer;
cursor:hand;
filter:alpha(opacity=80);
opacity:0.8;
-moz-opacity:0.8;
-khtml-opacity:0.8;
-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=80)";
}
#start_button:hover
{
color:#ffaa00;
filter:alpha(opacity=100);
opacity:1;
-moz-opacity:1;
-khtml-opacity:1;
-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
}
/* This file belongs to a CrossBrowdy.com example, made by Joan Alba Maldonado. Creative Commons Attribution 4.0 International License. */
/* Using timbre.js library internally: https://mohayonao.github.io/timbre.js/ */
/* Using subcollider.js library internally: https://mohayonao.github.io/subcollider/ */
CB_init(main); //It will call the "main" function when ready.
//Global 'T' object to play the sounds:
var timbreJSObject = null;
//Global 'result':
var bufferResult = null;
//This function will be called when CrossBrowdy is ready:
function main()
{
//Hides any messages:
CB_Elements.hideById("messages");
//Shows the start button:
CB_Elements.showById("start_button");
}
//Prepares the 'T' object and shows the controls if all goes well:
function prepareTimbreJSObject()
{
//Hides the start button:
CB_Elements.hideById("start_button");
//Audio processing and synthesizing example (taken from https://mohayonao.github.io/timbre.js/reich.html):
timbreJSObject = CB_Speaker.getTimbreJSObject(); //Gets the 'T' object.
if (timbreJSObject !== null)
{
timbreJSObject.rec
(
function(output)
{
var midis = [69, 71, 72, 76, 69, 71, 72, 76].scramble();
var msec = timbreJSObject.timevalue("bpm120 l8");
var synth = timbreJSObject
(
"OscGen",
{ env: timbreJSObject("perc", { r: msec, ar: true }) }
);
timbreJSObject
(
"interval",
{ interval: msec },
function(count)
{
if (count < midis.length)
{
synth.noteOn(midis[count], 100);
}
else { output.done(); }
}
).start();
output.send(synth);
}
).then
(
function(result)
{
//Hides any messages:
CB_Elements.hideById("messages");
//Shows the controls:
CB_Elements.showById("controls");
bufferResult = result;
}
);
}
else
{
var message = "The 'T' object (used by the timbre.js library) is null. Probably not supported.";
CB_Elements.showById("messages");
CB_Elements.insertContentById("messages", message);
CB_console(message);
}
}
//Plays the audio:
function play()
{
try
{
var L = timbreJSObject("buffer", { buffer: bufferResult, loop: true });
var R = timbreJSObject("buffer", { buffer: bufferResult, loop: true });
}
catch(E) { CB_console("Cannot create buffer. Error: " + E); return; }
var num = 400;
var duration = L.duration;
R.pitch = (duration * (num - 1)) / (duration * num);
//Plays the audio:
//Note: at least the first time, it is recommended to do it through a user-driven event (as "onClick", "onTouchStart", etc.) in order to maximize compatibility (as some clients could block sounds otherwise).
timbreJSObject
(
"delay",
{ time: "bpm120 l16", fb: 0.1, cross: true },
timbreJSObject("pan", { pos: -0.6 }, L),
timbreJSObject("pan", { pos: +0.6 }, R)
).play();
}
You can check the Guides & Tutorials category as well as the API documentation in the case you need more information.
All the examples together can be downloaded here.