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+/*
+ ----------------------------------------------------------
+ MIDI.Plugin : 0.3.4 : 2015-03-26
+ ----------------------------------------------------------
+ https://github.com/mudcube/MIDI.js
+ ----------------------------------------------------------
+ Inspired by javax.sound.midi (albeit a super simple version):
+ http://docs.oracle.com/javase/6/docs/api/javax/sound/midi/package-summary.html
+ ----------------------------------------------------------
+ Technologies
+ ----------------------------------------------------------
+ Web MIDI API - no native support yet (jazzplugin)
+ Web Audio API - firefox 25+, chrome 10+, safari 6+, opera 15+
+ HTML5 Audio Tag - ie 9+, firefox 3.5+, chrome 4+, safari 4+, opera 9.5+, ios 4+, android 2.3+
+ ----------------------------------------------------------
+*/
+
+if (typeof MIDI === 'undefined') MIDI = {};
+
+MIDI.Soundfont = MIDI.Soundfont || {};
+MIDI.Player = MIDI.Player || {};
+
+(function(root) { 'use strict';
+
+ root.DEBUG = true;
+ root.USE_XHR = true;
+ root.soundfontUrl = './soundfont/';
+
+ /*
+ MIDI.loadPlugin({
+ onsuccess: function() { },
+ onprogress: function(state, percent) { },
+ targetFormat: 'mp3', // optionally can force to use MP3 (for instance on mobile networks)
+ instrument: 'acoustic_grand_piano', // or 1 (default)
+ instruments: [ 'acoustic_grand_piano', 'acoustic_guitar_nylon' ] // or multiple instruments
+ });
+ */
+
+ root.loadPlugin = function(opts) {
+ if (typeof opts === 'function') {
+ opts = {onsuccess: opts};
+ }
+
+ root.soundfontUrl = opts.soundfontUrl || root.soundfontUrl;
+
+ /// Detect the best type of audio to use
+ root.audioDetect(function(supports) {
+ var hash = window.location.hash;
+ var api = '';
+
+ /// use the most appropriate plugin if not specified
+ if (supports[opts.api]) {
+ api = opts.api;
+ } else if (supports[hash.substr(1)]) {
+ api = hash.substr(1);
+ } else if (supports.webmidi) {
+ api = 'webmidi';
+ } else if (window.AudioContext) { // Chrome
+ api = 'webaudio';
+ } else if (window.Audio) { // Firefox
+ api = 'audiotag';
+ }
+
+ if (connect[api]) {
+ /// use audio/ogg when supported
+ if (opts.targetFormat) {
+ var audioFormat = opts.targetFormat;
+ } else { // use best quality
+ var audioFormat = supports['audio/ogg'] ? 'ogg' : 'mp3';
+ }
+
+ /// load the specified plugin
+ root.__api = api;
+ root.__audioFormat = audioFormat;
+ root.supports = supports;
+ root.loadResource(opts);
+ }
+ });
+ };
+
+ /*
+ root.loadResource({
+ onsuccess: function() { },
+ onprogress: function(state, percent) { },
+ instrument: 'banjo'
+ })
+ */
+
+ root.loadResource = function(opts) {
+ var instruments = opts.instruments || opts.instrument || 'acoustic_grand_piano';
+ ///
+ if (typeof instruments !== 'object') {
+ if (instruments || instruments === 0) {
+ instruments = [instruments];
+ } else {
+ instruments = [];
+ }
+ }
+ /// convert numeric ids into strings
+ for (var i = 0; i < instruments.length; i ++) {
+ var instrument = instruments[i];
+ if (instrument === +instrument) { // is numeric
+ if (root.GM.byId[instrument]) {
+ instruments[i] = root.GM.byId[instrument].id;
+ }
+ }
+ }
+ ///
+ opts.format = root.__audioFormat;
+ opts.instruments = instruments;
+ ///
+ connect[root.__api](opts);
+ };
+
+ var connect = {
+ webmidi: function(opts) {
+ // cant wait for this to be standardized!
+ root.WebMIDI.connect(opts);
+ },
+ audiotag: function(opts) {
+ // works ok, kinda like a drunken tuna fish, across the board
+ // http://caniuse.com/audio
+ requestQueue(opts, 'AudioTag');
+ },
+ webaudio: function(opts) {
+ // works awesome! safari, chrome and firefox support
+ // http://caniuse.com/web-audio
+ requestQueue(opts, 'WebAudio');
+ }
+ };
+
+ var requestQueue = function(opts, context) {
+ var audioFormat = opts.format;
+ var instruments = opts.instruments;
+ var onprogress = opts.onprogress;
+ var onerror = opts.onerror;
+ ///
+ var length = instruments.length;
+ var pending = length;
+ var waitForEnd = function() {
+ if (!--pending) {
+ onprogress && onprogress('load', 1.0);
+ root[context].connect(opts);
+ }
+ };
+ ///
+ for (var i = 0; i < length; i ++) {
+ var instrumentId = instruments[i];
+ if (MIDI.Soundfont[instrumentId]) { // already loaded
+ waitForEnd();
+ } else { // needs to be requested
+ sendRequest(instruments[i], audioFormat, function(evt, progress) {
+ var fileProgress = progress / length;
+ var queueProgress = (length - pending) / length;
+ onprogress && onprogress('load', fileProgress + queueProgress, instrumentId);
+ }, function() {
+ waitForEnd();
+ }, onerror);
+ }
+ };
+ };
+
+ var sendRequest = function(instrumentId, audioFormat, onprogress, onsuccess, onerror) {
+ var soundfontPath = root.soundfontUrl + instrumentId + '-' + audioFormat + '.js';
+ if (root.USE_XHR) {
+ root.util.request({
+ url: soundfontPath,
+ format: 'text',
+ onerror: onerror,
+ onprogress: onprogress,
+ onsuccess: function(event, responseText) {
+ var script = document.createElement('script');
+ script.language = 'javascript';
+ script.type = 'text/javascript';
+ script.text = responseText;
+ document.body.appendChild(script);
+ ///
+ onsuccess();
+ }
+ });
+ } else {
+ dom.loadScript.add({
+ url: soundfontPath,
+ verify: 'MIDI.Soundfont["' + instrumentId + '"]',
+ onerror: onerror,
+ onsuccess: function() {
+ onsuccess();
+ }
+ });
+ }
+ };
+
+ root.setDefaultPlugin = function(midi) {
+ for (var key in midi) {
+ root[key] = midi[key];
+ }
+ };
+
+})(MIDI); \ No newline at end of file