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drum_brain.js
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// Enable WebMidi.js
WebMidi.enable(function(){
output=WebMidi.outputs[1];
$("#outputmeter").append(""+output.name);
// var i = 0;
var outputnum=WebMidi.outputs.length;
$("#log").append(outputnum+' outputs');
for (var i = 0; i < WebMidi.outputs.length; i++) {
$("#outputs").append('<option value="'+i+'">'+WebMidi.outputs[i].name+'</option>');
}
});
(function (window) {
var beat=1;
endloop = $("#endloop").val();
endpart1=(((endloop-1)*4)+1);
endpart2=(((endpart1-1)*2)+1);
//var endloop=17;
// var endpart1=17;
//var endpart2=33;
var bpm=500;
var qbpm=125;
var ms = 60000;
var measure=1;
var mypart=1;
var x=1;
var c=0;
var timerId=null;
window.changeOut=function(){
var a=$("#outputs").val();
output=WebMidi.outputs[a];
$("#outputmeter").html(""+output.name);
}
window.stopDrums=function(){
$("#log").append("Stopped<br>");
if (timerId){clearInterval(timerId);}
}
window.playDrums=function(tempo){
window.stopDrums();
timerId = setInterval(function () {
if(beat==endloop){beat='1';
measure++;
if(measure==endpart1){
//$(".part1").hide();
//$(".part2").show();
mypart=2;
}
if(measure==endpart2){
mypart=1;
//$(".part1").show();
//$(".part2").hide();
measure=1;
}
}
$("#log").html("");
$("#log").append("<br>"+mypart+","+measure+","+beat+" : <br>");
beat++;
if (beat!=''){
//BASS
if(document.getElementById("playbass"+beat+""+mypart+"").checked) {
output.playNote("C1", 10,{duration: 150, velocity:127});
}
if(document.getElementById("randombass"+beat+""+mypart+"").checked) {
var w=Math.floor((Math.random()* 10)+ 1);
if (w=='1'){
output.playNote("C1", 10,{duration: 150, velocity:127});
}
}
//SNARE
if(document.getElementById("playsnare"+beat+""+mypart+"").checked) {
output.playNote("D1", 10,{duration: 150, velocity:127});
}
if(document.getElementById("randomsnare"+beat+""+mypart+"").checked) {
var w=Math.floor((Math.random()* 10)+ 1);
if (w=='1'){
output.playNote("D1", 10,{duration: 150, velocity:127});
}
}
//HIHAT
if(document.getElementById("playhihat"+beat+""+mypart+"").checked) {
// $("#log").append(" hihat");
// $("#log").append(" sent to "+output.name);
output.playNote("F#1", 10,{duration: 150, velocity:127});
}
if(document.getElementById("randomhihat"+beat+""+mypart+"").checked) {
var w=Math.floor((Math.random()* 10)+ 1);
if (w=='1'){
output.playNote("F#1", 10,{duration: 150, velocity:127});
}
}
//OPENHAT
if(document.getElementById("playopenhat"+beat+""+mypart+"").checked) {
output.playNote("A#1", 10,{duration: 150, velocity:127});
}
if(document.getElementById("randomopenhat"+beat+""+mypart+"").checked) {
var w=Math.floor((Math.random()* 10)+ 1);
if (w=='1'){
output.playNote("A#1", 10,{duration: 150, velocity:127});
}
}
//LOTOM
if(document.getElementById("playlotom"+beat+""+mypart+"").checked) {
output.playNote("G1", 10,{duration: 150, velocity:127});
}
if(document.getElementById("randomlotom"+beat+""+mypart+"").checked) {
var w=Math.floor((Math.random()* 10)+ 1);
if (w=='1'){
output.playNote("G1", 10,{duration: 150, velocity:127});
}
}
//Ride cymbal
if(document.getElementById("playride"+beat+""+mypart+"").checked) {
//$("#log").append(" ride");
// $("#log").append(" sent to "+output.name);
output.playNote("C#2", 10,{duration: 150, velocity:127});
}
if(document.getElementById("randomride"+beat+""+mypart+"").checked) {
var w=Math.floor((Math.random()* 10)+ 1);
if (w=='1'){
output.playNote("C#2", 10,{duration: 150, velocity:127});
}
}
// hitom
if(document.getElementById("playhitom"+beat+""+mypart+"").checked) {
output.playNote("D#1", 10,{duration: 150, velocity:127});
}
if(document.getElementById("randomhitom"+beat+""+mypart+"").checked) {
var w=Math.floor((Math.random()* 10)+ 1);
if (w=='1'){
output.playNote("D#1", 10,{duration: 150, velocity:127});
}
}
// Crash
if(document.getElementById("playcrash"+beat+""+mypart+"").checked) {
output.playNote("D#1", 10,{duration: 150, velocity:127});
}
if(document.getElementById("randomcrash"+beat+""+mypart+"").checked) {
var w=Math.floor((Math.random()* 10)+ 1);
if (w=='1'){
output.playNote("D#1", 10,{duration: 150, velocity:127});
}
}
}
}, tempo);//interval
}
window.resetLoop=function(){
$("#sequencer").html('');
window.setupDrums('bass');
window.setupDrums('snare');
window.setupDrums('hihat');
window.setupDrums('openhat');
window.setupDrums('lotom');
window.setupDrums('hitom');
window.setupDrums('ride');
window.setupDrums('crash');
endloop = $("#endloop").val();
endpart1=(((endloop-1)*4)+1);
endpart2=(((endpart1-1)*2)+1);
var loopsteps=(endloop -1);
$("#loopmeter").html(loopsteps);
}
window.playNow=function(){
var tempo = $("#tempo").val();
//var tempo = window.getElementById("tempo").value();
window.playDrums(''+tempo+'');
var bpm= ((60000/tempo)/ 4);
$("#tempometer").html(''+tempo+'(ms) / '+bpm+' bpm');
}
window.setupDrums=function(instrument){
var endloop = $("#endloop").val();
$("#sequencer").append(''+
'<div class="row" id="my'+instrument+'">'+instrument+'<br></div>');
var b=1;
var subtractor=endloop-1;
var stepwidth=94/subtractor;
while(b<endloop){b++;
$("#my"+instrument).append(''+
'<div style="width:'+stepwidth+'%" class="step part1" id="'+instrument+''+b+'1">'+
'<input type="checkbox" style=" background:#333; color:#333" ID="play'+instrument+''+b+'1"><br>'+
'<input class=“rand” type="checkbox" style=" background:#aaa; color:#aaa" ID="random'+instrument+''+b+'1">'+
//'<input type="range" min="1" max="100" value="50" step="1" ID="prob'+instrument+''+b+'">'+
'</div>'+
'');
$("#my"+instrument).append(''+
'<div style="width:'+stepwidth+'%"class="step part2" id="'+instrument+''+b+'2">'+
'<input type="checkbox" style=" background:#333; color:#333" ID="play'+instrument+''+b+'2"><br>'+
'<input class=“rand” type="checkbox" style=" background:#aaa; color:#aaa" ID="random'+instrument+''+b+'2">'+
//'<input type="range" min="1" max="100" value="50" step="1" ID="prob'+instrument+''+b+'">'+
'</div>'+
'');
}
}
}(this));
$(document).ready(function(){
$("#controller").append(''+
'<input class="transport" type="button" onclick="playNow(); return false" value="PLAY »">'+
'<input class="transport" type="button" onclick="stopDrums();" value="STOP[]">'+
'<input class="transport" id="partswitch" type="button" value="verse/chorus"><div ID="log"></div>'+
'<div style="float: right; width: 100px;"><select onchange="changeOut();" name="outputs" id="outputs"></select></div>'+
'<div id="outputmeter"></div>'+
'<div class="panel2"> Beats<div id="loopmeter"></div><input ID = "endloop" type="range" data-show-value="true" min="5" max="17" step="4" name="endloop" value="9" onchange="resetLoop(); " style="width:100%" placeholder="beats"></div>'+
'<div class="panel"><div id="tempometer"><br></div>'+
'<input ID = "tempo" type="range" data-show-value="true" min="50" max="300" name="tempo" value="120" onchange="playNow(); " style="width:100%" placeholder="Tempo"></div>'+
'</div> ');
$("#partswitch").click(function(){
$(".part1").toggle();
$(".part2").toggle();
});
window.resetLoop();
});