deac/MIDI.js
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Michael Deal 2013-01-22 16:46:32 -08:00
parent 83abe4c609
commit b9757cab9b
3 changed files with 51 additions and 101 deletions
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10
README.md
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@ -1,6 +1,6 @@
CODE EXAMPLES (from the repo) CODE EXAMPLES (from the repo)
* ./demo-Basic.html is the most basic implementation as seen here: * ./demo-Basic.html is the most basic implementation.
* ./demo-MIDIPlayer.html shows how to parse MIDI files, and interact with the data stream. * ./demo-MIDIPlayer.html shows how to parse MIDI files, and interact with the data stream.
* ./demo-WhitneyMusicBox.html is a audio/visual experiment by Jim Bumgardner * ./demo-WhitneyMusicBox.html is a audio/visual experiment by Jim Bumgardner
@ -15,14 +15,8 @@ DEMOS
------------- -------------
SOUNDFONT GENERATORS (*not* required to get started!)
* Ruby
* Shell
-------------
* <a href="./js/MIDI.loadPlugin.js">MIDI.loadPlugin.js</a>: Decides which framework is best to use, and sends request. * <a href="./js/MIDI.loadPlugin.js">MIDI.loadPlugin.js</a>: Decides which framework is best to use, and sends request.
<pre> <pre>
// interface to download soundfont, then execute callback; // interface to download soundfont, then execute callback;
MIDI.loadPlugin(callback); MIDI.loadPlugin(callback);

104
build/MIDI.js
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@ -510,7 +510,7 @@ MIDI.audioDetect = function(callback) {
})(); })();
/* /*
----------------------------------------------------------- -----------------------------------------------------------
MIDI.loadPlugin : 0.1 : 11/20/2012 MIDI.loadPlugin : 0.1.2 : 01/18/2012
----------------------------------------------------------- -----------------------------------------------------------
https://github.com/mudcube/MIDI.js https://github.com/mudcube/MIDI.js
----------------------------------------------------------- -----------------------------------------------------------
@ -526,6 +526,9 @@ if (typeof (MIDI.Soundfont) === "undefined") MIDI.Soundfont = {};
(function() { "use strict"; (function() { "use strict";
// Turn on to get "onprogress" event. XHR will not work from file://
var USE_XHR = false;
MIDI.loadPlugin = function(conf) { MIDI.loadPlugin = function(conf) {
if (typeof(conf) === "function") conf = { callback: conf }; if (typeof(conf) === "function") conf = { callback: conf };
/// Get the instrument name. /// Get the instrument name.
@ -533,7 +536,6 @@ MIDI.loadPlugin = function(conf) {
if (typeof(instruments) !== "object") instruments = [ instruments ]; if (typeof(instruments) !== "object") instruments = [ instruments ];
instruments.map(function(data) { instruments.map(function(data) {
if (typeof(data) === "number") data = MIDI.GeneralMIDI.byId[data]; if (typeof(data) === "number") data = MIDI.GeneralMIDI.byId[data];
MIDI.Soundfont[data] = true;
return data; return data;
}); });
/// ///
@ -594,6 +596,7 @@ connect.audiotag = function(filetype, instruments, callback) {
var queue = createQueue({ var queue = createQueue({
items: instruments, items: instruments,
getNext: function(instrumentId) { getNext: function(instrumentId) {
if (USE_XHR) {
DOMLoader.sendRequest({ DOMLoader.sendRequest({
url: MIDI.soundfontUrl + instrumentId + "-" + filetype + ".js", url: MIDI.soundfontUrl + instrumentId + "-" + filetype + ".js",
onprogress: getPercent, onprogress: getPercent,
@ -603,6 +606,16 @@ connect.audiotag = function(filetype, instruments, callback) {
queue.getNext(); queue.getNext();
} }
}); });
} else {
DOMLoader.script.add({
src: MIDI.soundfontUrl + instrumentId + "-" + filetype + ".js",
verify: instrumentId,
callback: function() {
if (MIDI.loader) MIDI.loader.update(null, "Downloading...", 100);
queue.getNext();
}
});
}
}, },
onComplete: function() { onComplete: function() {
MIDI.AudioTag.connect(callback); MIDI.AudioTag.connect(callback);
@ -616,6 +629,7 @@ connect.webaudio = function(filetype, instruments, callback) {
var queue = createQueue({ var queue = createQueue({
items: instruments, items: instruments,
getNext: function(instrumentId) { getNext: function(instrumentId) {
if (USE_XHR) {
DOMLoader.sendRequest({ DOMLoader.sendRequest({
url: MIDI.soundfontUrl + instrumentId + "-" + filetype + ".js", url: MIDI.soundfontUrl + instrumentId + "-" + filetype + ".js",
onprogress: getPercent, onprogress: getPercent,
@ -625,6 +639,16 @@ connect.webaudio = function(filetype, instruments, callback) {
queue.getNext(); queue.getNext();
} }
}); });
} else {
DOMLoader.script.add({
src: MIDI.soundfontUrl + instrumentId + "-" + filetype + ".js",
verify: "MIDI.Soundfont." + instrumentId,
callback: function() {
if (MIDI.loader) MIDI.loader.update(null, "Downloading...", 100);
queue.getNext();
}
});
}
}, },
onComplete: function() { onComplete: function() {
MIDI.WebAudioAPI.connect(callback); MIDI.WebAudioAPI.connect(callback);
@ -880,7 +904,7 @@ var startAudio = function (currentTime, fromCache) {
// //
for (var n = 0; n < length && messages < 100; n++) { for (var n = 0; n < length && messages < 100; n++) {
queuedTime += data[n][1]; queuedTime += data[n][1];
if (queuedTime <= currentTime) { if (queuedTime < currentTime) {
offset = queuedTime; offset = queuedTime;
continue; continue;
} }
@ -905,7 +929,7 @@ var startAudio = function (currentTime, fromCache) {
eventQueue.push({ eventQueue.push({
event: event, event: event,
source: MIDI.noteOff(channel, event.noteNumber, currentTime / 1000 + ctx.currentTime), source: MIDI.noteOff(channel, event.noteNumber, currentTime / 1000 + ctx.currentTime),
interval: scheduleTracking(channel, note, queuedTime, offset - 10, 128) interval: scheduleTracking(channel, note, queuedTime, offset, 128)
}); });
break; break;
default: default:
@ -1041,10 +1065,9 @@ if (window.AudioContext || window.webkitAudioContext) (function () {
source.connect(ctx.destination); source.connect(ctx.destination);
/// ///
var gainNode = ctx.createGainNode(); var gainNode = ctx.createGainNode();
var value = -0.5 + (velocity / 100) * 2; var value = (velocity / 100) * masterVolume * 2 - 1;
var minus = (1 - masterVolume) * 2;
gainNode.connect(ctx.destination); gainNode.connect(ctx.destination);
gainNode.gain.value = Math.max(-1, value - minus); gainNode.gain.value = Math.max(-1, value);
source.connect(gainNode); source.connect(gainNode);
source.noteOn(delay || 0); source.noteOn(delay || 0);
return source; return source;
@ -1984,73 +2007,6 @@ if (typeof(MusicTheory.Synesthesia) === "undefined") MusicTheory.Synesthesia = {
}; };
})(MusicTheory.Synesthesia); })(MusicTheory.Synesthesia);
// http://ntt.cc/2008/01/19/base64-encoder-decoder-with-javascript.html
// window.atob and window.btoa
(function (window) {
var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
window.btoa || (window.btoa = function encode64(input) {
input = escape(input);
var output = "";
var chr1, chr2, chr3 = "";
var enc1, enc2, enc3, enc4 = "";
var i = 0;
do {
chr1 = input.charCodeAt(i++);
chr2 = input.charCodeAt(i++);
chr3 = input.charCodeAt(i++);
enc1 = chr1 >> 2;
enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
enc4 = chr3 & 63;
if (isNaN(chr2)) {
enc3 = enc4 = 64;
} else if (isNaN(chr3)) {
enc4 = 64;
}
output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2) + keyStr.charAt(enc3) + keyStr.charAt(enc4);
chr1 = chr2 = chr3 = "";
enc1 = enc2 = enc3 = enc4 = "";
} while (i < input.length);
return output;
});
window.atob || (window.atob = function(input) {
var output = "";
var chr1, chr2, chr3 = "";
var enc1, enc2, enc3, enc4 = "";
var i = 0;
// remove all characters that are not A-Z, a-z, 0-9, +, /, or =
var base64test = /[^A-Za-z0-9\+\/\=]/g;
if (base64test.exec(input)) {
alert("There were invalid base64 characters in the input text.\n" + "Valid base64 characters are A-Z, a-z, 0-9, '+', '/',and '='\n" + "Expect errors in decoding.");
}
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
do {
enc1 = keyStr.indexOf(input.charAt(i++));
enc2 = keyStr.indexOf(input.charAt(i++));
enc3 = keyStr.indexOf(input.charAt(i++));
enc4 = keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 != 64) {
output = output + String.fromCharCode(chr2);
}
if (enc4 != 64) {
output = output + String.fromCharCode(chr3);
}
chr1 = chr2 = chr3 = "";
enc1 = enc2 = enc3 = enc4 = "";
} while (i < input.length);
return unescape(output);
});
}(this));
/* /*
---------------------------------------------------- ----------------------------------------------------
Loader.js : 0.4.2 : 2012/11/09 Loader.js : 0.4.2 : 2012/11/09

2
build/MIDI.min.js vendored
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