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Diffstat (limited to 'assets/trading-in-the-rain/MIDI.js/js/midi/loader.js')
| -rw-r--r-- | assets/trading-in-the-rain/MIDI.js/js/midi/loader.js | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/assets/trading-in-the-rain/MIDI.js/js/midi/loader.js b/assets/trading-in-the-rain/MIDI.js/js/midi/loader.js new file mode 100644 index 0000000..02136f6 --- /dev/null +++ b/assets/trading-in-the-rain/MIDI.js/js/midi/loader.js @@ -0,0 +1,199 @@ +/* + ---------------------------------------------------------- + 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);
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