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Diffstat (limited to 'Processing-js/libs/js/MIDI/LoadPlugin.js')
| -rw-r--r-- | Processing-js/libs/js/MIDI/LoadPlugin.js | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/Processing-js/libs/js/MIDI/LoadPlugin.js b/Processing-js/libs/js/MIDI/LoadPlugin.js new file mode 100644 index 0000000..dad5cbd --- /dev/null +++ b/Processing-js/libs/js/MIDI/LoadPlugin.js @@ -0,0 +1,179 @@ +/* + ----------------------------------------------------------- + MIDI.loadPlugin : 0.1.2 : 01/22/2014 + ----------------------------------------------------------- + https://github.com/mudcube/MIDI.js + ----------------------------------------------------------- + MIDI.loadPlugin({ + 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 + callback: function() { } + }); +*/ + +if (typeof (MIDI) === "undefined") var MIDI = {}; +if (typeof (MIDI.Soundfont) === "undefined") MIDI.Soundfont = {}; + +(function() { "use strict"; + +var USE_JAZZMIDI = false; // Turn on to support JazzMIDI Plugin + +MIDI.loadPlugin = function(conf) { + if (typeof(conf) === "function") conf = { + callback: conf + }; + /// Get the instrument name. + var instruments = conf.instruments || conf.instrument || "acoustic_grand_piano"; + if (typeof(instruments) !== "object") instruments = [ instruments ]; + /// + for (var n = 0; n < instruments.length; n ++) { + var instrument = instruments[n]; + if (typeof(instrument) === "number") { + instruments[n] = MIDI.GeneralMIDI.byId[instrument]; + } + }; + /// + MIDI.soundfontUrl = conf.soundfontUrl || MIDI.soundfontUrl || "./soundfont/"; + /// Detect the best type of audio to use. + MIDI.audioDetect(function(types) { + var api = ""; + // use the most appropriate plugin if not specified + if (apis[conf.api]) { + api = conf.api; + } else if (apis[window.location.hash.substr(1)]) { + api = window.location.hash.substr(1); + } else if (USE_JAZZMIDI && navigator.requestMIDIAccess) { + api = "webmidi"; + } else if (window.webkitAudioContext || window.AudioContext) { // Chrome + api = "webaudio"; + } else if (window.Audio) { // Firefox + api = "audiotag"; + } else { // Internet Explorer + api = "flash"; + } + /// + if (!connect[api]) return; + // use audio/ogg when supported + if (conf.targetFormat) { + var filetype = conf.targetFormat; + } else { // use best quality + var filetype = types["audio/ogg"] ? "ogg" : "mp3"; + } + // load the specified plugin + MIDI.lang = api; + MIDI.supports = types; + connect[api](filetype, instruments, conf); + }); +}; + +/// + +var connect = {}; + +connect.webmidi = function(filetype, instruments, conf) { + if (MIDI.loader) MIDI.loader.message("Web MIDI API..."); + MIDI.WebMIDI.connect(conf); +}; + +connect.flash = function(filetype, instruments, conf) { + // fairly quick, but requires loading of individual MP3s (more http requests). + if (MIDI.loader) MIDI.loader.message("Flash API..."); + DOMLoader.script.add({ + src: conf.soundManagerUrl || "./inc/SoundManager2/script/soundmanager2.js", + verify: "SoundManager", + callback: function () { + MIDI.Flash.connect(instruments, conf); + } + }); +}; + +connect.audiotag = function(filetype, instruments, conf) { + if (MIDI.loader) MIDI.loader.message("HTML5 Audio API..."); + // works ok, kinda like a drunken tuna fish, across the board. + var queue = createQueue({ + items: instruments, + getNext: function(instrumentId) { + DOMLoader.sendRequest({ + url: MIDI.soundfontUrl + instrumentId + "-" + filetype + ".js", + onprogress: getPercent, + onload: function (response) { + addSoundfont(response.responseText); + if (MIDI.loader) MIDI.loader.update(null, "Downloading", 100); + queue.getNext(); + } + }); + }, + onComplete: function() { + MIDI.AudioTag.connect(conf); + } + }); +}; + +connect.webaudio = function(filetype, instruments, conf) { + if (MIDI.loader) MIDI.loader.message("Web Audio API..."); + // works awesome! safari, chrome and firefox support. + var queue = createQueue({ + items: instruments, + getNext: function(instrumentId) { + DOMLoader.sendRequest({ + url: MIDI.soundfontUrl + instrumentId + "-" + filetype + ".js", + onprogress: getPercent, + onload: function(response) { + addSoundfont(response.responseText); + if (MIDI.loader) MIDI.loader.update(null, "Downloading...", 100); + queue.getNext(); + } + }); + }, + onComplete: function() { + MIDI.WebAudio.connect(conf); + } + }); +}; + +/// Helpers + +var apis = { + "webmidi": true, + "webaudio": true, + "audiotag": true, + "flash": true +}; + +var addSoundfont = function(text) { + var script = document.createElement("script"); + script.language = "javascript"; + script.type = "text/javascript"; + script.text = text; + document.body.appendChild(script); +}; + +var getPercent = function(event) { + if (!this.totalSize) { + if (this.getResponseHeader("Content-Length-Raw")) { + this.totalSize = parseInt(this.getResponseHeader("Content-Length-Raw")); + } else { + this.totalSize = event.total; + } + } + /// + var percent = this.totalSize ? Math.round(event.loaded / this.totalSize * 100) : ""; + if (MIDI.loader) MIDI.loader.update(null, "Downloading...", percent); +}; + +var createQueue = function(conf) { + var self = {}; + self.queue = []; + for (var key in conf.items) { + self.queue.push(conf.items[key]); + } + self.getNext = function() { + if (!self.queue.length) return conf.onComplete(); + conf.getNext(self.queue.shift()); + }; + setTimeout(self.getNext, 1); + return self; +}; + +})();
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