User:Lbattich/Sound Prototypes: Difference between revisions

Revision as of 22:23, 4 November 2014

Circle Scanner

Scans the canvas and produces sounds according to the image data (forefox only)

<!DOCTYPE html>
<!--
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| |_   _  ___ __ _ ___            
| | | | |/ __/ _` / __|           
| | |_| | (_| (_| \__ \           
|_|\__,_|\___\__,_|___/           
                                  
 _           _   _   _      _     
| |__   __ _| |_| |_(_) ___| |__  
| '_ \ / _` | __| __| |/ __| '_ \ 
| |_) | (_| | |_| |_| | (__| | | |
|_.__/ \__,_|\__|\__|_|\___|_| |_|


CRICLE SCANNER
by LUCAS BATTICH, 2014
  
-->
<html>
  <head>
    <meta content="text/html; charset=utf-8" http-equiv="content-type">
    <title>Circle Scanner - by lucas battich</title>
  </head>
  <body>
  	
    <button onclick="start()">scan</button>
    <button onclick="circle()">draw a circle</button>
    <button onclick="white()">clear up</button>
    <button onclick="silence()">stop</button>
    <br>
    <br>
    <canvas id="myCanvas" width="500" height="300"></canvas>
    
    <script>
    
    var context = new AudioContext();
    var osc1 = context.createOscillator();
    var osc2 = context.createOscillator();
    var osc3 = context.createOscillator();
    var osc4 = context.createOscillator();
    var osc5 = context.createOscillator();
    var gain1 = context.createGain(); // Create gain node 1
    var gain2 = context.createGain();
    var gain3 = context.createGain();
    var gain4 = context.createGain();
    var gain5 = context.createGain();
    
    var tid;
    var x = 0;
    
     // Connect oscillators to gains, and gain to context destination (speakers)
	osc1.connect(gain1);
	osc2.connect(gain2);
	osc3.connect(gain3);
	osc4.connect(gain4);
	osc5.connect(gain5);
	gain1.connect(context.destination);
	gain2.connect(context.destination);
	gain3.connect(context.destination);
	gain4.connect(context.destination);
	gain5.connect(context.destination);
	
    osc1.frequency.value = 500;
    osc2.frequency.value = 400;
    osc3.frequency.value = 300;
    osc4.frequency.value = 200;
    osc5.frequency.value = 100;
	gain1.gain.value = 0;
	gain2.gain.value = 0;
	gain3.gain.value = 0;
	gain4.gain.value = 0;
	gain5.gain.value = 0;
	osc1.start(0);
	osc2.start(0);
	osc3.start(0);
	osc4.start(0);
	osc5.start(0);
	
	var blackloud = true;
	var canvas = document.getElementById('myCanvas');
    var ctx = canvas.getContext('2d');
    canvas.width=window.innerWidth-30;
    white();
    circle();
      
    function start(){
    if (tid){
    	clearTimeout(tid);
    	}
    	x = 0;
    	change();
    }
    
	function scan() {
	
		var data = ctx.getImageData(x,0,1,1).data;   // (x, y, width, height)
		var pixel = data[0] + data[1] + data[2];
		var scale = pixel / (255*3);  //scale from 0=black=quiet and 1=white=loud
		gain1.gain.value = blackloud ? 1-scale : scale;
		
		var data = ctx.getImageData(x,75,1,1).data;   // (x, y, width, height)
		var pixel = data[0] + data[1] + data[2];
		var scale = pixel / (255*3);  //0=black and 1=white
		gain2.gain.value = blackloud ? 1-scale : scale;
		
		var data = ctx.getImageData(x,150,1,1).data;   // (x, y, width, height)
		var pixel = data[0] + data[1] + data[2];
		var scale = pixel / (255*3);  //0=black and 1=white
		gain3.gain.value = blackloud ? 1-scale : scale;
		
		var data = ctx.getImageData(x,225,1,1).data;   // (x, y, width, height)
		var pixel = data[0] + data[1] + data[2];
		var scale = pixel / (255*3);  //0=black and 1=white
		gain4.gain.value = blackloud ? 1-scale : scale;
		
		var data = ctx.getImageData(x,299,1,1).data;   // (x, y, width, height)
		var pixel = data[0] + data[1] + data[2];
		var scale = pixel / (255*3);  //0=black and 1=white
		gain5.gain.value = blackloud ? 1-scale : scale;
		
		//ctx.drawImage(imageObj, 0, 0);
		//ctx.beginPath();
		//ctx.moveTo(x,0);
		//ctx.lineTo(x,300);
		//ctx.lineWidth="1";
		//ctx.strokeStyle="red";
		//ctx.stroke();
	}
	
	function white() {
		ctx.fillStyle="white"; //first colour
		ctx.fillRect(0,0,canvas.width,canvas.height);
		ctx.fill();
	}
	
	function change() {
		scan();
		x = x+1;
		if (x < (canvas.width-1)) {
			tid = setTimeout(change,7);
		}
		else {
			x=0;
			tid = setTimeout(change,7);
		}
	}
	
  	function silence() {
  		gain1.gain.value = 0;
  		gain2.gain.value = 0;
  		gain3.gain.value = 0;
  		gain4.gain.value = 0;
  		gain5.gain.value = 0;
  		clearTimeout(tid);
  	}
  	function circle()
	{
var xc,yc,radio;
yc=Math.floor((canvas.height+1)*Math.random());
xc=Math.floor((canvas.width+1)*Math.random());
radio=Math.floor((200)*Math.random());
ctx.beginPath();
ctx.arc(xc,yc,radio,0,2*Math.PI);
var grd=ctx.createLinearGradient(xc-radio,yc-radio,xc+radio,yc+radio);
grd.addColorStop(0,colourme());
grd.addColorStop(1,colourme());
ctx.strokeStyle=grd;
ctx.lineWidth=Math.floor((100)*Math.random());
ctx.stroke();
}

function colourme()
{
var a = Math.floor(256*Math.random());
var b = Math.floor(256*Math.random());
var c = Math.floor(256*Math.random());
var colour = "rgb("+a+","+b+","+c+")";
return colour;
}
    </script>
  </body>
</html>

Audio Test - Play a random composition using the Oscillator wave generator on the Web Audio API

Works only on Firefox so far...

A VERY basic concept for a 12-tone composition generator... Based on Schoenberg's system and using a randomized approach.

Audio Test - Play a random composition

| Adding sound to the previous test on visual shapes: (move cursor around)

<!DOCTYPE html>
<html>
  <head>
    <meta content="text/html; charset=utf-8" http-equiv="content-type">
    <title>Audio test - Play a random composition</title>
  </head>
  <body>
  	<p>Choose frequency between 80Hz and 880Hz: <input type="text" size="7" id="fr" value=""> <label for="fr">Hz</label></p>
  	<p>Choose gain between 0.2 and 1.2: <input type="text" size="7" id="gn" value=""> <label for="gn">Gain</label></p>
  	<p>Choose duration between 1/50sec and 1sec: <input type="text" size="7" id="tm" value=""> <label for="tm">Seconds</label></p>
  	<p>Choose waveform: <input type="text" size="7" id="vw" value=""> <label for="tm">wave</label></p>
  	<br>
    <button onclick="play()">play</button>
    <button onclick="silence()">stop</button>
    <script>
    
    var context = new AudioContext();
    var tone = context.createOscillator();
    var gainNode1 = context.createGain(); // Create gain node 1
    var on=0;
    
    tone.type = 0; // sine wave
    tone.frequency.value = 0;
	tone.connect(gainNode1); // Connect sound source tone to gain node 1
	gainNode1.connect(context.destination);
	gainNode1.gain.value = 0;
	tone.start(0);
	
	function play(){
		if (on==0){
			on=1;
			change();
		}
	}

	function change() {
		if (on==1){
		// random gain between 0.2 and 1.2
			var gain = 0.2+Math.random();
			gainNode1.gain.value = gain;
			document.getElementById("gn").value = gain;
		
		// random frequency between 80 and 880
			var freq = 80 + Math.floor(801*Math.random());
			tone.frequency.value = freq;
			document.getElementById("fr").value = freq;
		
		//random wave shape
			var wave = Math.floor(4*Math.random());
			tone.type = wave; 
			if (wave==0){document.getElementById("vw").value="Sine";}
        		else if (wave==1){document.getElementById("vw").value="Square";}
        		else if (wave==2){document.getElementById("vw").value="Sawtooth";}
        		else if (wave==3){document.getElementById("vw").value="Triangle";}
        
		// random duration of note -  1/50sec to 1sec
			var time = 20 + Math.floor(901*Math.random());
			document.getElementById("tm").value = time/1000;
			setTimeout(function(){change()},time);
        	}
	}
	
  	function silence() {
  		tone.frequency.value = 0;
  		gainNode1.gain.value = 0;
  		on=0;
  	}
    </script>
  </body>
</html>