536 lines
16 KiB
JavaScript
536 lines
16 KiB
JavaScript
/*
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--------------------------------------------
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MIDI.Plugin : 0.3.2 : 2013/01/24
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--------------------------------------------
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https://github.com/mudcube/MIDI.js
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--------------------------------------------
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APIs:
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MIDI.WebMIDIAPI
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MIDI.WebAudioAPI
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MIDI.Flash
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MIDI.HTML5
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--------------------------------------------
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Helpers:
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MIDI.GeneralMIDI
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MIDI.channels
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MIDI.keyToNote
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MIDI.noteToKey
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*/
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if (typeof (MIDI) === "undefined") var MIDI = {};
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(function() { "use strict";
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/*
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--------------------------------------------
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Web MIDI API - Native Soundbank
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--------------------------------------------
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https://dvcs.w3.org/hg/audio/raw-file/tip/midi/specification.html
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*/
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(function () {
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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 root = MIDI.WebMIDI = {};
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root.setVolume = function (channel, volume) { // set channel volume
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output.send([0xB0 + channel, 0x07, volume]);
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};
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root.programChange = function (channel, program) { // change channel instrument
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output.send([0xC0 + channel, program]);
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};
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root.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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root.noteOff = function (channel, note, delay) {
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output.send([0x80 + channel, note], delay * 1000);
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};
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root.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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root.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, velocity], delay * 1000);
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}
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};
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root.stopAllNotes = function () {
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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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root.getInput = function () {
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return plugin.getInputs();
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};
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root.getOutputs = function () {
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return plugin.getOutputs();
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};
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root.connect = function (callback) {
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MIDI.technology = "Web MIDI API";
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MIDI.setVolume = root.setVolume;
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MIDI.programChange = root.programChange;
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MIDI.noteOn = root.noteOn;
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MIDI.noteOff = root.noteOff;
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MIDI.chordOn = root.chordOn;
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MIDI.chordOff = root.chordOff;
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MIDI.stopAllNotes = root.stopAllNotes;
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MIDI.getInput = root.getInput;
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MIDI.getOutputs = root.getOutputs;
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navigator.requestMIDIAccess(function (access) {
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plugin = access;
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output = plugin.getOutput(0);
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if (callback) callback();
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}, function (err) {
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console.log("uh-oh! Something went wrong! Error code: " + err.code );
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});
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};
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})();
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/*
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--------------------------------------------
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Web Audio API - OGG or MPEG Soundbank
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--------------------------------------------
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https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html
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--------------------------------------------
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*/
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if (typeof (MIDI.WebAudioAPI) === "undefined") MIDI.WebAudioAPI = {};
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if (window.AudioContext || window.webkitAudioContext) (function () {
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var AudioContext = window.AudioContext || window.webkitAudioContext;
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var root = MIDI.WebAudioAPI;
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var ctx;
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var sources = {};
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var masterVolume = 1;
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var audioBuffers = {};
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var audioLoader = function (instrument, urlList, index, bufferList, callback) {
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var synth = MIDI.GeneralMIDI.byName[instrument];
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var instrumentId = synth.number;
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var url = urlList[index];
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var base64 = MIDI.Soundfont[instrument][url].split(",")[1];
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var buffer = Base64Binary.decodeArrayBuffer(base64);
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ctx.decodeAudioData(buffer, function (buffer) {
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var msg = url;
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while (msg.length < 3) msg += " ";
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if (typeof (MIDI.loader) !== "undefined") {
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MIDI.loader.update(null, synth.instrument + "<br>Processing: " + (index / 87 * 100 >> 0) + "%<br>" + msg);
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}
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buffer.id = url;
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bufferList[index] = buffer;
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//
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if (bufferList.length === urlList.length) {
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while (bufferList.length) {
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buffer = bufferList.pop();
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if (!buffer) continue;
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var nodeId = MIDI.keyToNote[buffer.id];
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audioBuffers[instrumentId + "" + nodeId] = buffer;
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}
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callback(instrument);
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}
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});
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};
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root.setVolume = function (n) {
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masterVolume = n;
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};
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root.programChange = function (channel, program) {
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MIDI.channels[channel].instrument = program;
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};
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root.noteOn = function (channel, note, velocity, delay) {
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/// check whether the note exists
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if (!MIDI.channels[channel]) return;
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var instrument = MIDI.channels[channel].instrument;
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if (!audioBuffers[instrument + "" + note]) return;
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/// convert relative delay to absolute delay
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if (delay < ctx.currentTime) delay += ctx.currentTime;
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/// crate audio buffer
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var source = ctx.createBufferSource();
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sources[channel + "" + note] = source;
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source.buffer = audioBuffers[instrument + "" + note];
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source.connect(ctx.destination);
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///
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var gainNode = ctx.createGainNode();
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var value = (velocity / 100) * masterVolume * 2 - 1;
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gainNode.connect(ctx.destination);
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gainNode.gain.value = Math.max(-1, value);
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source.connect(gainNode);
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source.noteOn(delay || 0);
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return source;
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};
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// FIX: needs some way to fade out smoothly..
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// POSSIBLE FIX: fade out smoothly using gain and ramping to value
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root.noteOff = function (channel, note, delay) {
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delay = delay || 0;
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var source = sources[channel + "" + note];
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if (!source) return;
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source.gain.linearRampToValueAtTime(1, delay);
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source.gain.linearRampToValueAtTime(0, delay + 0.75);
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source.noteOff(delay + 0.75);
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return source;
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};
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root.chordOn = function (channel, chord, velocity, delay) {
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var ret = {}, note;
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for (var n = 0, length = chord.length; n < length; n++) {
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ret[note = chord[n]] = root.noteOn(channel, note, velocity, delay);
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}
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return ret;
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};
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root.chordOff = function (channel, chord, delay) {
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var ret = {}, note;
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for (var n = 0, length = chord.length; n < length; n++) {
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ret[note = chord[n]] = root.noteOff(channel, note, delay);
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}
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return ret;
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};
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root.connect = function (callback) {
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MIDI.technology = "Web Audio API";
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MIDI.setVolume = root.setVolume;
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MIDI.programChange = root.programChange;
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MIDI.noteOn = root.noteOn;
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MIDI.noteOff = root.noteOff;
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MIDI.chordOn = root.chordOn;
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MIDI.chordOff = root.chordOff;
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//
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MIDI.Player.ctx = ctx = new AudioContext();
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///
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var urlList = [];
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var keyToNote = MIDI.keyToNote;
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for (var key in keyToNote) urlList.push(key);
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var bufferList = [];
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var pending = {};
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var oncomplete = function(instrument) {
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delete pending[instrument];
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for (var key in pending) break;
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if (!key) callback();
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};
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for (var instrument in MIDI.Soundfont) {
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pending[instrument] = true;
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for (var i = 0; i < urlList.length; i++) {
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audioLoader(instrument, urlList, i, bufferList, oncomplete);
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}
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}
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};
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})();
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/*
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AudioTag <audio> - OGG or MPEG Soundbank
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--------------------------------------
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http://dev.w3.org/html5/spec/Overview.html#the-audio-element
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*/
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if (window.Audio) (function () {
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var root = MIDI.AudioTag = {};
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var note2id = {};
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var volume = 1; // floating point
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var channel_nid = -1; // current channel
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var channels = []; // the audio channels
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var notes = {}; // the piano keys
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for (var nid = 0; nid < 12; nid++) {
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channels[nid] = new Audio();
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}
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var playChannel = function (channel, note) {
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if (!MIDI.channels[channel]) return;
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var instrument = MIDI.channels[channel].instrument;
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var id = MIDI.GeneralMIDI.byId[instrument].id;
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var note = notes[note];
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if (!note) return;
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var nid = (channel_nid + 1) % channels.length;
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var time = (new Date()).getTime();
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var audio = channels[nid];
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audio.src = MIDI.Soundfont[id][note.id];
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audio.volume = volume;
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audio.play();
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channel_nid = nid;
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};
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root.programChange = function (channel, program) {
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MIDI.channels[channel].instrument = program;
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};
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root.setVolume = function (n) {
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volume = n;
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};
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root.noteOn = function (channel, note, velocity, delay) {
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var id = note2id[note];
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if (!notes[id]) return;
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if (delay) {
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var interval = window.setTimeout(function () {
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playChannel(channel, id);
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}, delay * 1000);
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return interval;
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} else {
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playChannel(channel, id);
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}
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};
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root.noteOff = function (channel, note, delay) {
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};
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root.chordOn = function (channel, chord, velocity, delay) {
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for (var key in chord) {
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var n = chord[key];
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var id = note2id[n];
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if (!notes[id]) continue;
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playChannel(channel, id);
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}
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};
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root.chordOff = function (channel, chord, delay) {
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};
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root.stopAllNotes = function () {
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for (var nid = 0, length = channels.length; nid < length; nid++) {
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channels[nid].pause();
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}
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};
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root.connect = function (callback) {
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var loading = {};
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for (var key in MIDI.keyToNote) {
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note2id[MIDI.keyToNote[key]] = key;
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notes[key] = {
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id: key
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};
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}
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MIDI.technology = "HTML Audio Tag";
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MIDI.setVolume = root.setVolume;
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MIDI.programChange = root.programChange;
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MIDI.noteOn = root.noteOn;
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MIDI.noteOff = root.noteOff;
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MIDI.chordOn = root.chordOn;
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MIDI.chordOff = root.chordOff;
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///
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if (callback) callback();
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};
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})();
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/*
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--------------------------------------------
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Flash - MP3 Soundbank
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--------------------------------------------
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http://www.schillmania.com/projects/soundmanager2/
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--------------------------------------------
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*/
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(function () {
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var root = MIDI.Flash = {};
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var noteReverse = {};
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var notes = {};
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root.programChange = function (channel, program) {
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MIDI.channels[channel].instrument = program;
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};
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root.setVolume = function (channel, note) {
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};
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root.noteOn = function (channel, note, velocity, delay) {
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if (!MIDI.channels[channel]) return;
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var instrument = MIDI.channels[channel].instrument;
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var id = MIDI.GeneralMIDI.byId[instrument].number;
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note = id + "" + noteReverse[note];
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if (!notes[note]) return;
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if (delay) {
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var interval = window.setTimeout(function() {
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notes[note].play({ volume: velocity * 2 });
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}, delay * 1000);
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return interval;
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} else {
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notes[note].play({ volume: velocity * 2 });
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}
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};
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root.noteOff = function (channel, note, delay) {
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};
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root.chordOn = function (channel, chord, velocity, delay) {
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if (!MIDI.channels[channel]) return;
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var instrument = MIDI.channels[channel].instrument;
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var id = MIDI.GeneralMIDI.byId[instrument].number;
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for (var key in chord) {
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var n = chord[key];
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var note = id + "" + noteReverse[n];
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if (notes[note]) {
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notes[note].play({ volume: velocity * 2 });
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}
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}
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};
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root.chordOff = function (channel, chord, delay) {
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};
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root.stopAllNotes = function () {
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};
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root.connect = function (callback) {
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soundManager.flashVersion = 9;
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soundManager.useHTML5Audio = true;
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soundManager.url = '../inc/SoundManager2/swf/';
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soundManager.useHighPerformance = true;
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soundManager.wmode = 'transparent';
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soundManager.flashPollingInterval = 1;
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soundManager.debugMode = false;
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soundManager.onload = function () {
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var createBuffer = function(instrument, id, onload) {
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var synth = MIDI.GeneralMIDI.byName[instrument];
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var instrumentId = synth.number;
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notes[instrumentId+""+id] = soundManager.createSound({
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id: id,
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url: MIDI.soundfontUrl + instrument + "-mp3/" + id + ".mp3",
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multiShot: true,
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autoLoad: true,
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onload: onload
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});
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};
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for (var instrument in MIDI.Soundfont) {
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var loaded = [];
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var onload = function () {
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loaded.push(this.sID);
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if (typeof (MIDI.loader) === "undefined") return;
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MIDI.loader.update(null, "Processing: " + this.sID);
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};
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for (var i = 0; i < 88; i++) {
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var id = noteReverse[i + 21];
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createBuffer(instrument, id, onload);
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}
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}
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///
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MIDI.technology = "Flash";
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MIDI.setVolume = root.setVolume;
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MIDI.programChange = root.programChange;
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MIDI.noteOn = root.noteOn;
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MIDI.noteOff = root.noteOff;
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MIDI.chordOn = root.chordOn;
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MIDI.chordOff = root.chordOff;
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//
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var interval = window.setInterval(function () {
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if (loaded.length !== 88) return;
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window.clearInterval(interval);
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if (callback) callback();
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}, 25);
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};
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soundManager.onerror = function () {
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};
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for (var key in MIDI.keyToNote) {
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noteReverse[MIDI.keyToNote[key]] = key;
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}
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};
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})();
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/*
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helper functions
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*/
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// instrument-tracker
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MIDI.GeneralMIDI = (function (arr) {
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var clean = function(v) {
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return v.replace(/[^a-z0-9 ]/gi, "").replace(/[ ]/g, "_").toLowerCase();
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};
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var ret = {
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byName: {},
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byId: {},
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byCategory: {}
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};
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for (var key in arr) {
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var list = arr[key];
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for (var n = 0, length = list.length; n < length; n++) {
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var instrument = list[n];
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if (!instrument) continue;
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var num = parseInt(instrument.substr(0, instrument.indexOf(" ")), 10);
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instrument = instrument.replace(num + " ", "");
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ret.byId[--num] =
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ret.byName[clean(instrument)] =
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ret.byCategory[clean(key)] = {
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id: clean(instrument),
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instrument: instrument,
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number: num,
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category: key
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};
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}
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}
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return ret;
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})({
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'Piano': ['1 Acoustic Grand Piano', '2 Bright Acoustic Piano', '3 Electric Grand Piano', '4 Honky-tonk Piano', '5 Electric Piano 1', '6 Electric Piano 2', '7 Harpsichord', '8 Clavinet'],
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'Chromatic Percussion': ['9 Celesta', '10 Glockenspiel', '11 Music Box', '12 Vibraphone', '13 Marimba', '14 Xylophone', '15 Tubular Bells', '16 Dulcimer'],
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'Organ': ['17 Drawbar Organ', '18 Percussive Organ', '19 Rock Organ', '20 Church Organ', '21 Reed Organ', '22 Accordion', '23 Harmonica', '24 Tango Accordion'],
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'Guitar': ['25 Acoustic Guitar (nylon)', '26 Acoustic Guitar (steel)', '27 Electric Guitar (jazz)', '28 Electric Guitar (clean)', '29 Electric Guitar (muted)', '30 Overdriven Guitar', '31 Distortion Guitar', '32 Guitar Harmonics'],
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'Bass': ['33 Acoustic Bass', '34 Electric Bass (finger)', '35 Electric Bass (pick)', '36 Fretless Bass', '37 Slap Bass 1', '38 Slap Bass 2', '39 Synth Bass 1', '40 Synth Bass 2'],
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'Strings': ['41 Violin', '42 Viola', '43 Cello', '44 Contrabass', '45 Tremolo Strings', '46 Pizzicato Strings', '47 Orchestral Harp', '48 Timpani'],
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'Ensemble': ['49 String Ensemble 1', '50 String Ensemble 2', '51 Synth Strings 1', '52 Synth Strings 2', '53 Choir Aahs', '54 Voice Oohs', '55 Synth Choir', '56 Orchestra Hit'],
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'Brass': ['57 Trumpet', '58 Trombone', '59 Tuba', '60 Muted Trumpet', '61 French Horn', '62 Brass Section', '63 Synth Brass 1', '64 Synth Brass 2'],
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'Reed': ['65 Soprano Sax', '66 Alto Sax', '67 Tenor Sax', '68 Baritone Sax', '69 Oboe', '70 English Horn', '71 Bassoon', '72 Clarinet'],
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'Pipe': ['73 Piccolo', '74 Flute', '75 Recorder', '76 Pan Flute', '77 Blown Bottle', '78 Shakuhachi', '79 Whistle', '80 Ocarina'],
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'Synth Lead': ['81 Lead 1 (square)', '82 Lead 2 (sawtooth)', '83 Lead 3 (calliope)', '84 Lead 4 (chiff)', '85 Lead 5 (charang)', '86 Lead 6 (voice)', '87 Lead 7 (fifths)', '88 Lead 8 (bass + lead)'],
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'Synth Pad': ['89 Pad 1 (new age)', '90 Pad 2 (warm)', '91 Pad 3 (polysynth)', '92 Pad 4 (choir)', '93 Pad 5 (bowed)', '94 Pad 6 (metallic)', '95 Pad 7 (halo)', '96 Pad 8 (sweep)'],
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'Synth Effects': ['97 FX 1 (rain)', '98 FX 2 (soundtrack)', '99 FX 3 (crystal)', '100 FX 4 (atmosphere)', '101 FX 5 (brightness)', '102 FX 6 (goblins)', '103 FX 7 (echoes)', '104 FX 8 (sci-fi)'],
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|
'Ethnic': ['105 Sitar', '106 Banjo', '107 Shamisen', '108 Koto', '109 Kalimba', '110 Bagpipe', '111 Fiddle', '112 Shanai'],
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|
'Percussive': ['113 Tinkle Bell', '114 Agogo', '115 Steel Drums', '116 Woodblock', '117 Taiko Drum', '118 Melodic Tom', '119 Synth Drum'],
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|
'Sound effects': ['120 Reverse Cymbal', '121 Guitar Fret Noise', '122 Breath Noise', '123 Seashore', '124 Bird Tweet', '125 Telephone Ring', '126 Helicopter', '127 Applause', '128 Gunshot']
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|
});
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|
|
|
// channel-tracker
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|
MIDI.channels = (function () { // 0 - 15 channels
|
|
var channels = {};
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|
for (var n = 0; n < 16; n++) {
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|
channels[n] = { // default values
|
|
instrument: 0,
|
|
// Acoustic Grand Piano
|
|
mute: false,
|
|
mono: false,
|
|
omni: false,
|
|
solo: false
|
|
};
|
|
}
|
|
return channels;
|
|
})();
|
|
|
|
//
|
|
MIDI.pianoKeyOffset = 21;
|
|
|
|
// note conversions
|
|
MIDI.keyToNote = {}; // C8 == 108
|
|
MIDI.noteToKey = {}; // 108 == C8
|
|
(function () {
|
|
var A0 = 0x15; // first note
|
|
var C8 = 0x6C; // last note
|
|
var number2key = ["C", "Db", "D", "Eb", "E", "F", "Gb", "G", "Ab", "A", "Bb", "B"];
|
|
for (var n = A0; n <= C8; n++) {
|
|
var octave = (n - 12) / 12 >> 0;
|
|
var name = number2key[n % 12] + octave;
|
|
MIDI.keyToNote[name] = n;
|
|
MIDI.noteToKey[n] = name;
|
|
}
|
|
})();
|
|
|
|
})(); |