93 lines
2.6 KiB
JavaScript
93 lines
2.6 KiB
JavaScript
/*
|
|
----------------------------------------------------------------------
|
|
Web MIDI API - Native Soundbanks
|
|
----------------------------------------------------------------------
|
|
http://webaudio.github.io/web-midi-api/
|
|
----------------------------------------------------------------------
|
|
*/
|
|
|
|
(function(root) { 'use strict';
|
|
|
|
var plugin = null;
|
|
var output = null;
|
|
var channels = [];
|
|
var midi = root.WebMIDI = {api: 'webmidi'};
|
|
midi.send = function(data, delay) { // set channel volume
|
|
output.send(data, delay * 1000);
|
|
};
|
|
|
|
midi.setController = function(channel, type, value, delay) {
|
|
output.send([channel, type, value], delay * 1000);
|
|
};
|
|
|
|
midi.setVolume = function(channel, volume, delay) { // set channel volume
|
|
output.send([0xB0 + channel, 0x07, volume], delay * 1000);
|
|
};
|
|
|
|
midi.programChange = function(channel, program, delay) { // change patch (instrument)
|
|
output.send([0xC0 + channel, program], delay * 1000);
|
|
};
|
|
|
|
midi.pitchBend = function(channel, program, delay) { // pitch bend
|
|
output.send([0xE0 + channel, program], delay * 1000);
|
|
};
|
|
|
|
midi.noteOn = function(channel, note, velocity, delay) {
|
|
output.send([0x90 + channel, note, velocity], delay * 1000);
|
|
};
|
|
|
|
midi.noteOff = function(channel, note, delay) {
|
|
output.send([0x80 + channel, note, 0], delay * 1000);
|
|
};
|
|
|
|
midi.chordOn = function(channel, chord, velocity, delay) {
|
|
for (var n = 0; n < chord.length; n ++) {
|
|
var note = chord[n];
|
|
output.send([0x90 + channel, note, velocity], delay * 1000);
|
|
}
|
|
};
|
|
|
|
midi.chordOff = function(channel, chord, delay) {
|
|
for (var n = 0; n < chord.length; n ++) {
|
|
var note = chord[n];
|
|
output.send([0x80 + channel, note, 0], delay * 1000);
|
|
}
|
|
};
|
|
|
|
midi.stopAllNotes = function() {
|
|
output.cancel();
|
|
for (var channel = 0; channel < 16; channel ++) {
|
|
output.send([0xB0 + channel, 0x7B, 0]);
|
|
}
|
|
};
|
|
|
|
midi.connect = function(opts) {
|
|
root.setDefaultPlugin(midi);
|
|
var errFunction = function(err) { // well at least we tried!
|
|
if (window.AudioContext) { // Chrome
|
|
opts.api = 'webaudio';
|
|
} else if (window.Audio) { // Firefox
|
|
opts.api = 'audiotag';
|
|
} else { // no support
|
|
return;
|
|
}
|
|
root.loadPlugin(opts);
|
|
};
|
|
///
|
|
navigator.requestMIDIAccess().then(function(access) {
|
|
plugin = access;
|
|
var pluginOutputs = plugin.outputs;
|
|
if (typeof pluginOutputs == 'function') { // Chrome pre-43
|
|
output = pluginOutputs()[0];
|
|
} else { // Chrome post-43
|
|
output = pluginOutputs[0];
|
|
}
|
|
if (output === undefined) { // nothing there...
|
|
errFunction();
|
|
} else {
|
|
opts.onsuccess && opts.onsuccess();
|
|
}
|
|
}, errFunction);
|
|
};
|
|
|
|
})(MIDI); |