source: main/trunk/model-sites-dev/respooled/collect/popup-video-respooled/js/midi/plugin.webmidi.js@ 29863

/*
    ----------------------------------------------------------------------
    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);
        ///
        navigator.requestMIDIAccess().then(function(access) {
            plugin = access;
            output = plugin.outputs()[0];
            opts.onsuccess && opts.onsuccess();
        }, 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);
        });
    };

})(MIDI);