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reconstruct for multi-channel audio
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@medicalwei
medicalwei committed Sep 6, 2010
1 parent 6721d60 commit a6b45de
Showing 1 changed file with 92 additions and 83 deletions.
175 changes: 92 additions & 83 deletions index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -58,99 +58,106 @@
}
*/
} catch(e) { // plugin not supported (download externals)
var a = document.createElement("a");
a.href = "http://java.sun.com/products/java-media/sound/soundbanks.html";
a.target = "_blank";
a.appendChild(document.createTextNode("Download Soundbank"));
var div = document.getElementById('soundbank');
div.removeChild(div.firstChild);
div.appendChild(a);
}
}, 0);
},
start: function(sequence) {
MIDI.bpm = 120;
MIDI.tick = 0;
MIDI.TPQN = sequence.TPQN;
MIDI.noteNumber = 0;
MIDI.time = 0;
MIDI.playingSeq = sequence;
MIDI.play();
},
stopNote: function(channel, note){
MIDIPlugin.setChannel(channel);
MIDIPlugin.stopNote(note);
},
play: function() {
for(i=0;i<MIDI.playingSeq.channels.length;i++)
{
note = MIDI.playingSeq.channels[i].notes[MIDI.tick];
if(!note) continue;
for(j=0;j<note.length;j++){

MIDIPlugin.setChannel(i);
switch(note[j].note){
case 'r':
// MIDIPlugin.stopAllNotes();
break;

case 't':
MIDI.bpm=note[j].duration;
break;

default:
MIDIPlugin.setVelocity((16-note[j].volume)*4);
MIDIPlugin.playNote(note[j].note);
}
console.log("Channel " + i + ": " + note[j].note + " " + note[j].duration);
console.log("Time: " + MIDI.time);
while (true){
note = MIDI.playingSeq.notes[MIDI.noteNumber];
if(!note || note.time > MIDI.time) break;
/*
switch(note.note){
case 'r':
// MIDIPlugin.stopAllNotes();
break;
default:
*/
MIDIPlugin.setChannel(note.channel);
MIDIPlugin.setVolume((16-note.volume)*4);
MIDIPlugin.playNote(note.note);
setTimeout("MIDI.stopNote(" + note.channel + ", " + note.note + ")", note.duration-1);
/*
}
*/
console.log(note.channel + ": " + note.note);
MIDI.noteNumber += 1;
}
MIDI.tick += 1;
if (MIDI.tick <= MIDI.playingSeq.duration){
setTimeout(MIDI.play, (60000 / MIDI.bpm) / MIDI.TPQN);
if (note){
setTimeout(MIDI.play, note.time - MIDI.time);
MIDI.time = note.time;
}
}
};
};

String.prototype.parseMabinogiMML = function(){
var parsingString = this.replace(/[\n\r]/g,"");
var channelCount = 0;
var sequence = new MusicSequence();
while(true){
var channelString = mmlMabinogiNotation.exec(parsingString);
if(!channelString) break;
sequence.channels[channelCount] = channelString[1].toString().parseMML();
channelCount += 1;
}
sequence.combineNotes();
return sequence;
}

var bpm = 120;
String.prototype.parseMML = function(){

var channel = new MusicChannel();
var tick = 0;
var volume = 12;
var octave = 4;
var defaultLength = 4;
var TPQN = 96;
var time = 0;

var parsingString = this.toLowerCase();

while(true){
if(!channel.notes[tick]){
channel.notes[tick]=[];
}
var noteElement = mmlNoteRegex.exec(parsingString);
var duration = 0;
if(!noteElement) break;

switch(noteElement[2]){
case 't':
bpm = parseInt(noteElement[3]);
channel.notes[tick].push(new MusicNote('t', bpm));
break;

case 'r':
if(noteElement[3]==""){
duration = Math.ceil( TPQN * (4 / defaultLength));
duration = (60000 / bpm) * (4 / defaultLength);
}else{
duration = Math.ceil( TPQN * (4 / noteElement[3]) * (noteElement[4]=='.' ? 1.5 : 1) );
duration = (60000 / bpm) * (4 / noteElement[3]);
}
channel.notes[tick].push(new MusicNote('r', duration));
lastNote = tick;
if(noteElement[4]=='.'){
duration = duration * 1.5;
}
// channel.notes.push(new MusicNote(time, 'r', duration));
break;

case 'o':
octave = parseInt(noteElement[3]);
break;

case 'l':
defaultLength = noteElement[3] / (noteElement[4]=='.' ? 1.5 : 1);
defaultLength = parseInt(noteElement[3]);
break;

case 'v':
volume = noteElement[3];
volume = parseInt(noteElement[3]);
break;

case '>':
Expand All @@ -162,53 +169,64 @@
break;

case 'n':
duration = Math.round( TPQN * (4 / defaultLength));
duration = (60000 / bpm) * (4 / defaultLength);

if(noteElement[1]!="&") {
note = parseInt(noteElement[3]);
channel.notes[tick].push(new MusicNote(note, duration, volume));
lastNote = tick;
channel.notes.push(new MusicNote(time, note, duration, volume));
}
break;

default:
if(noteElement[3]==""){
duration = Math.ceil( TPQN * (4 / defaultLength));
duration = (60000 / bpm) * (4 / defaultLength);
}else{
duration = Math.ceil( TPQN * (4 / noteElement[3]) * (noteElement[4]=='.' ? 1.5 : 1) );
duration = (60000 / bpm) * (4 / noteElement[3]);
}
if(noteElement[4]=='.'){
duration = duration * 1.5;
}
if(noteElement[1]!="&") {
note = mmlKeys[noteElement[2]]+((octave-1) * 12);
channel.notes[tick].push(new MusicNote(note, duration, volume));
lastNote = tick;
channel.notes.push(new MusicNote(time, note, duration, volume));
}
}
tick += duration;
time += duration;
}

channel.duration = tick;
return channel;
};

MusicSequence = function(channels, TPQN){
this.TPQN=96;
if(TPQN) this.TPQN=TPQN;
MusicSequence = function(channels){
this.channels = []
if(!channels) channels=3;
for(i=0;i<channels;i++){
this.channels[i] = new MusicChannel;
}
this.duration = 0;
this.notes = [];
};

MusicSequence.prototype.combineNotes = function(){
var t=[];
this.notes = [];
for(i=0;i<this.channels.length;i++){
t[i]=this.channels[i].notes.shift();
}
while(true){
var f=undefined;
for(i=0;i<this.channels.length;i++){
if(t[i] && (f==undefined || t[f].time > t[i].time)) f=i;
}
if(f==undefined) break;
t[f].channel=f;
this.notes.push(t[f]);
t[f]=this.channels[f].notes.shift();
}
}

MusicChannel = function(){
this.notes = [];
this.duration = 0;
this.debug = [];
};

MusicNote = function(note, duration, volume){
MusicNote = function(time, note, duration, volume){
// duration is not so used here
this.time = time;
this.note = note;
this.duration = duration;
if(volume){
Expand All @@ -217,31 +235,22 @@
};

mmlNoteRegex = /(\&?)([A-Za-z<>][\+\-\#]?)(\-?[0-9]*)(\.?)/g;
mmlMabinogiNotation = /[,@]([^,;]*)/;
mmlMabinogiNotation = /[,@]([^,;]*)/g;

function beginPlay(){
sequence = new MusicSequence(3);
sequence.channels[0] = document.getElementById("mmlNotes_0").value.parseMML();
sequence.channels[1] = document.getElementById("mmlNotes_1").value.parseMML();
sequence.channels[2] = document.getElementById("mmlNotes_2").value.parseMML();
for(i=0;i<3;i++){
if(sequence.duration < sequence.channels[i].duration) {
sequence.duration = sequence.channels[i].duration;
}
}
sequence = document.getElementById("mmlNotes").value.parseMabinogiMML();
MIDI.start(sequence);
return false;
};

</script>
</head>
<body>
<div id="soundbank"></div>
<form>
<input type="text" id="mmlNotes_0">
<input type="text" id="mmlNotes_1">
<input type="text" id="mmlNotes_2">
<input type="button" onclick="beginPlay()" value="Play">
<form onsubmit="return beginPlay();">
<textarea id="mmlNotes"></textarea>
<input type="submit" value="Play">
</form>
<applet archive="MIDIPlugin.jar" code="MIDIPlugin.class" height="1" id="MIDIPlugin" name="MIDIPlugin" width="1"></applet>
</body>
</html>
</html>

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