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Code Issues Releases Wiki Activity

support for chords & rests

tc-disrupt-london-midi
Matthew Hodgson 2014-10-19 07:52:59 +01:00
parent acb76032b7
commit 4f58d41c15
1 changed files with 103 additions and 58 deletions
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161
webclient/components/matrix/midi-event-handler.js
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@ -25,6 +25,12 @@ var MidiEventHandler = {
vexTabString: "",
chord: {
start_midi_ts: 0,
end_midi_ts: 0,
notes: {},
},
currentMeasureTime: 0,
perLine: -1,
@ -79,6 +85,77 @@ notes C-D-E/4 #0# =:: C-D-E-F/4 =|=");
this.render();
},
getLogDuration: function(duration) {
var fraction = duration / this.beat;
console.log(fraction);
var musicFraction;
var duration = Math.floor(Math.log2(1 / fraction)) - 1;
},
renderChord: function(duration, rest) {
var logDuration = this.getLogDuration(duration);
var trashIt = false; // Flag to ignore artefact(???)
switch (logDuration) {
case 4:
musicFraction = "w";
break;
case 2:
musicFraction = "h";
break;
case 1:
musicFraction = "q";
break;
case 0:
musicFraction = "8";
break;
case -1:
musicFraction = "16";
break;
case -2:
musicFraction = "32";
break;
default:
console.log("## Ignored note");
// Too short, ignore it
trashIt = true;
break;
}
// Matthew is about to fix it
if (trashIt) return;
}
this.currentMeasureTime += duration;
var s = ":" + musicFraction + " ";
if (rest) {
s += "##";
}
else {
var notes = [];
for (var note in chord.notes) {
if (chord.notes.hasOwnProperty(note)) {
notes.push(note);
}
}
if (notes.length > 1) {
s += "(";
for (int i = 0; i < notes.length; i++) {
s += notes[i];
if (i < notes.length - 1) s+= ".";
}
s += ")";
}
else {
s += vexNote;
}
}
this.addNote(s);
},
handleEvent: function(event, isLiveEvent) {
if(!isLiveEvent) {
@ -105,73 +182,41 @@ notes C-D-E/4 #0# =:: C-D-E-F/4 =|=");
return;
}
var vexNote = this.getVexNote( this.getMidiNote(event.content.note) );
if ("on" === event.content.state) {
this.notesON[vexNote] = parseInt(event.content.midi_ts);
var midi_ts = parseInt(event.content.midi_ts);
this.notesON[vexNote] = midi_ts;
if (event.content.midi_ts - this.chord.start_midi_ts < 300) { // empirically
// just add it to the current chord we're building up.
this.chord.note[vexNote]++;
}
else {
// render the last note/chord
this.renderChord(this.chord.end_midi_ts - this.chord.start_midi_ts, false);
// check if it's been so long since the last note that we should do a rest.
var logDuration = this.getLogDuration(midi_ts - this.chord.end_midi_ts);
if (logDuration >= -2) {
this.renderChord(midi_ts - this.chord.end_midi_ts, true);
}
// start a new chord
this.chord.notes = { vexNote };
this.chord.start_midi_ts = midi_ts;
this.chord.end_midi_ts = 0;
}
}
else if (this.notesON[vexNote])
else if (this.notesON[vexNote]) // note is turning off.
{
// How long the note last
var duration = parseInt(event.content.midi_ts) - this.notesON[vexNote];
// How long the note lasts
this.chord.end_midi_ts = parseInt(event.content.midi_ts);
delete this.notesON[vexNote];
var fraction = duration / this.beat;
console.log(fraction);
var musicFraction;
// Flag to ignore artefact(???)
var trashIt = false;
var duration = Math.floor(Math.log2(1 / fraction)) - 1;
switch (duration) {
case 4:
musicFraction = "w";
break;
case 2:
musicFraction = "h";
break;
case 1:
musicFraction = "q";
break;
case 0:
musicFraction = "8";
break;
case -1:
musicFraction = "16";
break;
case -2:
musicFraction = "32";
break;
default :
console.log("## Ignored note");
// Too short, ignore it
trashIt = true;
break;
}
// Matthew is about to fix it
if (trashIt) return;
this.currentMeasureTime += duration;
vexNote = ":" + musicFraction + " " + vexNote;
this.addNote(vexNote);
// TODO: optimisation: we could render this note now if we know there are no others sounding...
}
},
c: function(fraction) {
return Math.floor(Math.log2(1 / fraction)) - 1;
},
addNote: function (vexNote) {