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