CrossBrowdy - Examples

Audio

Processing and synthesizing

This is an example about processing and synthesizing audio:

index.html:

<!DOCTYPE html>
<html>
	<head>
		<!-- This file belongs to a CrossBrowdy.com example, made by Joan Alba Maldonado. -->
		<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>

main.css:

/* This file belongs to a CrossBrowdy.com example, made by Joan Alba Maldonado. */

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)";
}

main.js:

/* This file belongs to a CrossBrowdy.com example, made by Joan Alba Maldonado. */
/* 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();
}

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