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bundle.js
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bundle.js
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(function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
var parseMidi = require('midi-file').parseMidi;
var writeMidi = require('midi-file').writeMidi;
var inst_to_track = {"piano":0,"violin":1,"cello":2,"bass":3,"guitar":4,"flute":5,"clarinet":6,"trumpet":7,"harp":8,"drum":9};
var inst_to_instgroup = {"piano":"piano","violin":"strings","cello":"strings","bass":"bass","guitar":"guitar","flute":"winds","clarinet":"winds","trumpet":"winds","harp":"harp","drums":"drums"};
window.copyup = function(elemid) {
document.getElementById("inbox").value = document.getElementById(elemid).value.trim();
window.encodingToMidiFile(document.getElementById("inbox").value, "download_inbox");
}
window.importMidi = function() {
alert("For best results, assign different tracks to different instruments out of Piano, Violin, Cello, Bass, Guitar, Flute, Clarinet, Trumpet, Harp, and Drums.\n" +
"The base MIDI linked to the right is already set up with these tracks.");
javascript:document.getElementById('file-input').click();
}
window.importMidiOpenAI = function() {
alert("For best results, use a tempo of 62.5, 125, or 250.");
if (!window.isLoading) {
javascript:document.getElementById('file-input-openai').click();
}
}
window.importMidiFile = function(file) {
var reader = new FileReader();
reader.readAsArrayBuffer(file);
window.file = file;
reader.onload = readerEvent => {
var content = new Uint8Array(readerEvent.target.result);
var midiData = parseMidi(content);
var mergedTrack = [];
var originalOrder = 0;
for (var i=0; i<midiData.tracks.length; i++) {
var startTime = 0;
for (var j=0; j<midiData.tracks[i].length; j++) {
var event = midiData.tracks[i][j];
startTime += event.deltaTime;
event.startTime = Math.round(startTime * 48 / midiData.header.ticksPerBeat);
event.originalOrder = originalOrder;
mergedTrack.push(event);
originalOrder++;
}
}
mergedTrack.sort(function(a, b){
if(a.startTime < b.startTime) { return -1; }
if(a.startTime > b.startTime) { return 1; }
if(a.originalOrder < b.originalOrder) { return -1; }
if(a.originalOrder > b.originalOrder) { return 1; }
return 0;
})
document.getElementById("piano").checked = false;
document.getElementById("strings").checked = false;
document.getElementById("winds").checked = false;
document.getElementById("drums").checked = false;
document.getElementById("harp").checked = false;
document.getElementById("guitar").checked = false;
document.getElementById("bass").checked = false;
var encoded = "";
var currentInsts = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];
for (var i=0; i<mergedTrack.length; i++) {
var event = mergedTrack[i];
var deltaTime = (i == 0) ? event.startTime : (event.startTime - mergedTrack[i-1].startTime);
var timeLeftToWait = deltaTime;
while (timeLeftToWait > 0) {
var waitTime = timeLeftToWait > 128 ? 128 : timeLeftToWait;
var token = 3968 + waitTime - 1;
encoded += token + " ";
timeLeftToWait -= waitTime;
}
if (event.type == "programChange") {
currentInsts[event.channel] = event.programNumber;
}
var currentInst = currentInsts[event.channel];
var inst;
var baseNoteOn;
var baseNoteOff;
var checkboxID;
if ([40,41,44,45,48,49,50,51].indexOf(currentInst) > -1) {
inst = "violin";
baseNoteOn = 14*128;
baseNoteOff = 15*128;
checkboxID = "strings";
} else if ([42,43].indexOf(currentInst) > -1) {
inst = "cello";
baseNoteOn = 16*128;
baseNoteOff = 17*128;
checkboxID = "strings";
} else if ([32,33,34,35,36,37,38,39].indexOf(currentInst) > -1) {
inst = "bass";
baseNoteOn = 18*128;
baseNoteOff = 19*128;
checkboxID = "bass";
} else if ([24,25,26,27,28,29,30,31].indexOf(currentInst) > -1) {
inst = "guitar";
baseNoteOn = 20*128;
baseNoteOff = 21*128;
checkboxID = "guitar";
} else if ([72,73,74,75,76,77,78,79].indexOf(currentInst) > -1) {
inst = "flute";
baseNoteOn = 22*128;
baseNoteOff = 23*128;
checkboxID = "winds";
} else if ([64,65,66,67,68,69,70,71].indexOf(currentInst) > -1) {
inst = "clarinet";
baseNoteOn = 24*128;
baseNoteOff = 25*128;
checkboxID = "winds";
} else if ([56,57,58,59,60,61,62,63].indexOf(currentInst) > -1) {
inst = "trumpet";
baseNoteOn = 26*128;
baseNoteOff = 27*128;
checkboxID = "winds";
} else if ([46].indexOf(currentInst) > -1) {
inst = "harp";
baseNoteOn = 28*128;
baseNoteOff = 29*128;
checkboxID = "harp";
} else {
inst = "piano";
var baseNoteGroup = Math.round(event.velocity/8) - 2;
if (baseNoteGroup < 1) { baseNoteGroup = 1; }
if (baseNoteGroup > 13) { baseNoteGroup = 13; }
baseNoteOn = baseNoteGroup*128;
baseNoteOff = 0*128;
checkboxID = "piano";
}
if (event.channel == 9) {
inst = "drum";
baseNoteOn = 3840;
baseNoteOff = null;
checkboxID = "drums";
}
if (event.type == "noteOff" || (event.type == "noteOn" && event.velocity==0)) {
if (baseNoteOff !== null) {
token = baseNoteOff + event.noteNumber;
encoded += token + " ";
}
} else if (event.type == "noteOn" && event.velocity > 0) {
token = baseNoteOn + event.noteNumber;
encoded += token + " ";
document.getElementById(checkboxID).checked = true;
}
}
document.getElementById("inbox").value = encoded.trim();
window.encodingToMidiFile(document.getElementById("inbox").value, "download_inbox");
}
}
window.importMidiFileOpenAI = function(file) {
var reader = new FileReader();
reader.readAsDataURL(file);
window.file = file;
startLoading();
reader.onload = readerEvent => {
var b64content = "b'" + readerEvent.target.result.split(',')[1] + "'";
console.log(b64content);
fetch("https://musenet.openai.com/midi", {
"method": "POST",
"headers": {
"Content-Type": "application/json"
},
"body": JSON.stringify({
"midi": b64content,
"audioFormat": document.getElementById("format").value
})
}).then(res => res.json()).then(function (response) {
document.getElementById("inbox").value = response.completions[0].encoding;
window.encodingToMidiFile(document.getElementById("inbox").value, "download_inbox");
document.getElementById("piano").checked = false;
document.getElementById("strings").checked = false;
document.getElementById("winds").checked = false;
document.getElementById("drums").checked = false;
document.getElementById("harp").checked = false;
document.getElementById("guitar").checked = false;
document.getElementById("bass").checked = false;
for (var i=0; i<response.completions[0].tracks.length; i++) {
document.getElementById(inst_to_instgroup[response.completions[0].tracks[i].instrument]).checked = true;
}
stopLoading();
}).catch(error => {
stopLoading();
alert(error);
});
}
}
var ding = new Audio('chord.wav');
ding.volume = 0.1;
window.isLoading = false;
function startLoading() {
document.getElementById("button").disabled = true;
window.isLoading = true;
document.getElementById("loader-inner").style.animation = "progress 60s linear both";
}
function stopLoading() {
ding.play();
document.getElementById("button").disabled = false;
window.isLoading = false;
document.getElementById("loader-inner").style.animation = "none";
}
window.extend = function() {
startLoading();
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gang","foreigner","tlc","scottjames","benfoldsfive","smashmouth","oasis","allsaints","donnasummer","weezer","bjork","mariahcarey","berte","cheaptrick","caroleking","thecars","gganderson","robertpalmer","zucchero","alicecooper","vanhalen","brucehornsby","coolio","jimmybuffett","lobo","badcompany","eminem","creedenceclearwaterrevival","deeppurple","shearinggeorge","robbiewilliams","dalla","ub40","lindaronstadt","sinatra","inxs","jonimitchell","michaeljackson","last","devo","shaniatwain","korn","brooksgarth","sweet","thewho","roxette","bowiedavid","beegees","renefroger","mina","estefangloria","mccartney","theventures","carboni","simplyred","santana","jewel","meatloaf","giorgia","nofx","rickymartin","thecure","thetemptations","tozzi","beck","eiffel65","jenniferlopez","reelbigfish","patsycline","richardcliff","styx","acdc","brucespringsteen","michaelgeorge","blondie","pinkfloyd","oldfieldmike","redhotchilipeppers","therollingstones","morandi","heart","robertaflack","pantera","alabama","jethrotull","hanson","mosch","ludwigvanbeethoven","dvorak","chrisrea","guns n' 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dunn","883","thedrifters","amygrant","herman","toriamos","eltonjohn","britneyspears","lennykravitz","celentano","ringostarr","neildiamond","aqua","oscarpeterson","joejackson","moby","collinsphil","leosayer","takethat","electriclightorchestra","pearljam","marcanthony","borodin","petshopboys","stevienicks","hollybuddy","turnertina","annaoxa","zztop","sting","themoodyblues","ruggeri","creed","claudebolling","renzoarbore","erasure","elviscostello","airsupply","tinaturner","leali","petergabriel","nodoubt","bread","huey lewis & the news","brandy","level42","radiohead","georgebenson","wonderstevie","thesmashingpumpkins","cyndilauper","rodstewart","bush","ramazzotti","bobseger","theshadows","gershwin","cream","biagioantonacci","steviewonder","nomadi","direstraits","davidbowie","amostori","thealanparsonsproject","johnlennon","crosbystillsnashandyoung","battiato","kansas","clementi","richielionel","yes","brassensgeorges","steelydan","jacksonmichael","buddyholly","earthwindandfire","natkingcole","therascals","bonjovi","alanparsons","backstreetboys","glencampbell","howardcarpendale","thesupremes","villagepeople","blink-182","jacksonbrowne","sade","lynyrdskynyrd","foofighters","2unlimited","battisti","hall & oates","stansfieldlisa","genesis","boyzone","theoffspring","tomjones","davematthewsband","johnelton","neilyoung","dionnewarwick","aceofbase","marilynmanson","taylorjames","rkelly","grandi","sublime","edvardgrieg","tool","bachjohannsebastian","patbenatar","celinedion","queen","soundgarden","abba","drdre","defleppard","dominofats","realmccoy","natalieimbruglia","hole","spinners","arethafranklin","reospeedwagon","indian","movie","scottish","irish","african","taylorswift","shakira","blues","latin","katyperry","world","kpop","africandrum","michaelbuble","rihanna","gospel","beyonce","chinese","arabic","adele","kellyclarkson","theeagles","handel","rachmaninov","schumann","christmas","dance","punk","natl_anthem","brahms","rap","ravel","burgmueller","other","schubert","granados","albeniz","mendelssohn","debussy","grieg","moszkowski","godowsky","folk","mussorgsky","kids","balakirev","hymns","verdi","hummel","deleted","delibes","saint-saens","puccini","satie","offenbach","widor","songs","stravinsky","vivaldi","gurlitt","alkan","weber","strauss","traditional","rossini","mahler","soler","sousa","telemann","busoni","scarlatti","stamitz","classical","jstrauss2","gabrieli","nielsen","purcell","donizetti","kuhlau","gounod","gibbons","weiss","faure","holst","spohr","monteverdi","reger","bizet","elgar","czerny","sullivan","shostakovich","franck","rubinstein","albrechtsberger","paganini","diabelli","gottschalk","wieniawski","lully","morley","sibelius","scriabin","heller","thalberg","dowland","carulli","pachelbel","sor","marcello","ketterer","rimsky-korsakov","ascher","bruckner","janequin","anonymous","kreutzer","sanz","joplin","susato","giuliani","lassus","palestrina","smetana","berlioz","couperin","gomolka","daquin","herz","campion","walthew","pergolesi","reicha","polak","holborne","hassler","corelli","cato","azzaiolo","anerio","gastoldi","goudimel","dussek","prez","cimarosa","byrd","praetorius","rameau","khachaturian","machaut","gade","perosi","gorzanis","smith","haberbier","carr","marais","glazunov","guerrero","cabanilles","losy","roman","hasse","sammartini","blow","zipoli","duvernoy","aguado","cherubini","victoria","field","andersen","poulenc","d'aragona","lemire","krakowa","maier","rimini","encina","banchieri","best","galilei","warhorse","gypsy","soundtrack","encore","roblaidlow","nationalanthems","benjyshelton","ongcmu","crosbystillsnashyoung","smashingpumpkins","aaaaaaaaaaa","alanismorrisette","animenz","onedirection","nintendo","disneythemes","gunsnroses","rollingstones","juliancasablancas","abdelmoinealfa","berckmansdeoliveira","moviethemes","beachboys","davemathews","videogamethemes","moabberckmansdeoliveira","unknown","cameronleesimpson","johannsebastianbach","thecarpenters","elo","nightwish","blink182","emersonlakeandpalmer","tvthemes"];
var genre = document.getElementById("genre").value;
if (genre == "<random>") {
genre = genreList[Math.floor(Math.random()*genreList.length)];
}
fetch("https://musenet.openai.com/sample", {
"method": "POST",
"headers": {
"Content-Type": "application/json"
},
"body": JSON.stringify({
"genre": genre,
"instrument":{
"piano": document.getElementById("piano").checked,
"strings": document.getElementById("strings").checked,
"winds": document.getElementById("winds").checked,
"drums": document.getElementById("drums").checked,
"harp": document.getElementById("harp").checked,
"guitar": document.getElementById("guitar").checked,
"bass": document.getElementById("bass").checked
},
"encoding":document.getElementById("inbox").value,
"temperature":parseFloat(document.getElementById("temperature").value),
"truncation":parseFloat(document.getElementById("truncation").value),
"generationLength":parseFloat(document.getElementById("generationLength").value),
"audioFormat": document.getElementById("format").value
})
}).then(res => res.json()).then(function (response) {
var seekTo = window.oldDuration - 5;
if (isNaN(seekTo) || !isFinite(seekTo) || seekTo < 0) {
seekTo = 0;
}
//need to convert from dataURI to blob to avoid firefox issue
var format = "audio/mp3";
var audioKey = "audioFile";
if (response.completions[0].oggFile) {
format = "audio/ogg";
audioKey = "oggFile";
}
document.getElementById('sound1').src=URL.createObjectURL(new Blob([convertDataURIToBinary("data:"+format+";base64,"+response.completions[0][audioKey].substring(2,response.completions[0][audioKey].length-1))], {type : format}));
document.getElementById('sound2').src=URL.createObjectURL(new Blob([convertDataURIToBinary("data:"+format+";base64,"+response.completions[1][audioKey].substring(2,response.completions[1][audioKey].length-1))], {type : format}));
document.getElementById('sound3').src=URL.createObjectURL(new Blob([convertDataURIToBinary("data:"+format+";base64,"+response.completions[2][audioKey].substring(2,response.completions[2][audioKey].length-1))], {type : format}));
document.getElementById('sound4').src=URL.createObjectURL(new Blob([convertDataURIToBinary("data:"+format+";base64,"+response.completions[3][audioKey].substring(2,response.completions[3][audioKey].length-1))], {type : format}));
document.getElementById("outbox1").value = response.completions[0].encoding;
document.getElementById("outbox2").value = response.completions[1].encoding;
document.getElementById("outbox3").value = response.completions[2].encoding;
document.getElementById("outbox4").value = response.completions[3].encoding;
window.encodingToMidiFile(response.completions[0].encoding, "download_outbox1");
window.encodingToMidiFile(response.completions[1].encoding, "download_outbox2");
window.encodingToMidiFile(response.completions[2].encoding, "download_outbox3");
window.encodingToMidiFile(response.completions[3].encoding, "download_outbox4");
document.getElementById('sound1').currentTime = seekTo;
document.getElementById('sound2').currentTime = seekTo;
document.getElementById('sound3').currentTime = seekTo;
document.getElementById('sound4').currentTime = seekTo;
stopLoading();
}).catch(error => {
stopLoading();
alert(error);
});
}
function convertDataURIToBinary(dataURI) {
var BASE64_MARKER = ';base64,';
var base64Index = dataURI.indexOf(BASE64_MARKER) + BASE64_MARKER.length;
var base64 = dataURI.substring(base64Index);
var raw = window.atob(base64);
var rawLength = raw.length;
var array = new Uint8Array(new ArrayBuffer(rawLength));
for(i = 0; i < rawLength; i++) {
array[i] = raw.charCodeAt(i);
}
return array;
}
window.encodingToMidiFile = function(encoding, outlink) {
var midiData = {
header: {
"format": 1,
"numTracks": 10,
"ticksPerBeat": 48
},
tracks: [[{"deltaTime":0,"channel":0,"type":"programChange","programNumber":0}],
[{"deltaTime":0,"channel":1,"type":"programChange","programNumber":40}],
[{"deltaTime":0,"channel":2,"type":"programChange","programNumber":42}],
[{"deltaTime":0,"channel":3,"type":"programChange","programNumber":32}],
[{"deltaTime":0,"channel":4,"type":"programChange","programNumber":24}],
[{"deltaTime":0,"channel":5,"type":"programChange","programNumber":73}],
[{"deltaTime":0,"channel":6,"type":"programChange","programNumber":71}],
[{"deltaTime":0,"channel":7,"type":"programChange","programNumber":56}],
[{"deltaTime":0,"channel":8,"type":"programChange","programNumber":46}],
[{"deltaTime":0,"channel":9,"type":"programChange","programNumber":0}]]
};
var tokens = [];
if (encoding.trim()) {
tokens = encoding.trim().split(" ");
}
var deltaTimes = [0,0,0,0,0,0,0,0,0,0];
var totalDelay = 0;
var usedDrumNotes = new Set();
for (var i=0; i<tokens.length; i++) {
var token = tokens[i];
var parsedToken = parseToken(token);
if (parsedToken.type == "note") {
var trackIndex = inst_to_track[parsedToken.instrument];
midiData.tracks[trackIndex].push({
"deltaTime": deltaTimes[trackIndex],
"channel": trackIndex,
"type": parsedToken.volume > 0 ? "noteOn" : "noteOff",
"noteNumber": parsedToken.pitch,
"velocity": parsedToken.volume
});
if (parsedToken.instrument == "drum") {
usedDrumNotes.add(parsedToken.pitch);
}
deltaTimes[trackIndex] = 0;
} else if (parsedToken.type == "wait") {
for (var j=0; j<10; j++) {
deltaTimes[j] += parsedToken.delay;
}
totalDelay += parsedToken.delay;
for (let pitch of usedDrumNotes) {
midiData.tracks[9].push({
"deltaTime": deltaTimes[9],
"channel": 9,
"type": "noteOff",
"noteNumber": pitch,
"velocity": 0
});
deltaTimes[9] = 0;
}
usedDrumNotes = new Set();
}
}
for (let pitch of usedDrumNotes) {
midiData.tracks[9].push({
"deltaTime": deltaTimes[9],
"channel": 9,
"type": "noteOff",
"noteNumber": pitch,
"velocity": 0
});
deltaTimes[9] = 0;
}
for (var i=0; i<midiData.tracks.length; i++) {
midiData.tracks[i].push({
"deltaTime": deltaTimes[i],
"meta": true,
"type": "endOfTrack"
});
deltaTimes[i] = 0;
}
var filteredMidiTracks = midiData.tracks.filter(track => track.length > 2);
if (filteredMidiTracks.length > 0) {
midiData.tracks = filteredMidiTracks;
}
midiData.tracks[0].unshift({
"deltaTime": 0,
"meta": true,
"type": "setTempo",
"microsecondsPerBeat": 480000
});
console.log(midiData);
var midiBlob = new Blob([new Uint8Array(writeMidi(midiData))], {type: "audio/midi"});
var objectUrl = URL.createObjectURL(midiBlob);
document.getElementById(outlink).href = objectUrl;
document.getElementById(outlink).target = "_blank";
document.getElementById(outlink).download = new Date().toISOString().replace("T","-").replaceAll(":","-").replace(/\..+/,"")+".mid";
if (outlink == "download_inbox") {
window.oldDuration = totalDelay / 100;
console.log(window.oldDuration);
}
}
window.encodingToMidiFile(document.getElementById("inbox").value, "download_inbox");
window.encodingToMidiFile(document.getElementById("outbox1").value, "download_outbox1");
window.encodingToMidiFile(document.getElementById("outbox2").value, "download_outbox2");
window.encodingToMidiFile(document.getElementById("outbox3").value, "download_outbox3");
window.encodingToMidiFile(document.getElementById("outbox4").value, "download_outbox4");
function parseToken(token) {
token = +token;
if (token >= 0 && token < 3840) {
var pitch = token % 128;
var inst_vol_index = token >> 7;
var instrument = ["piano","piano","piano","piano","piano","piano","piano","piano","piano","piano","piano","piano","piano","piano",
"violin","violin","cello","cello","bass","bass","guitar","guitar",
"flute","flute","clarinet","clarinet","trumpet","trumpet","harp","harp"][inst_vol_index];
var volume = [0,24,32,40,48,56,64,72,80,88,96,104,112,120,80,0,80,0,80,0,80,0,80,0,80,0,80,0,80,0][inst_vol_index];
return {"type":"note","pitch":pitch,"instrument":instrument,"volume":volume};
} else if (token >= 3840 && token < 3968) {
var pitch = token % 128;
return {"type":"note","pitch":pitch,"instrument":"drum","volume":80};
} else if (token >= 3968 && token < 4096) {
var delay = (token % 128) + 1;
return {"type":"wait","delay":delay}
} else if (token == 4096) {
return {"type":"start"}
} else {
return {"type":"invalid"}
}
}
},{"midi-file":2}],2:[function(require,module,exports){
exports.parseMidi = require('./lib/midi-parser')
exports.writeMidi = require('./lib/midi-writer')
},{"./lib/midi-parser":3,"./lib/midi-writer":4}],3:[function(require,module,exports){
// data can be any array-like object. It just needs to support .length, .slice, and an element getter []
function parseMidi(data) {
var p = new Parser(data)
var headerChunk = p.readChunk()
if (headerChunk.id != 'MThd')
throw "Bad MIDI file. Expected 'MHdr', got: '" + headerChunk.id + "'"
var header = parseHeader(headerChunk.data)
var tracks = []
for (var i=0; !p.eof() && i < header.numTracks; i++) {
var trackChunk = p.readChunk()
if (trackChunk.id != 'MTrk')
throw "Bad MIDI file. Expected 'MTrk', got: '" + trackChunk.id + "'"
var track = parseTrack(trackChunk.data)
tracks.push(track)
}
return {
header: header,
tracks: tracks
}
}
function parseHeader(data) {
var p = new Parser(data)
var format = p.readUInt16()
var numTracks = p.readUInt16()
var result = {
format: format,
numTracks: numTracks
}
var timeDivision = p.readUInt16()
if (timeDivision & 0x8000) {
result.framesPerSecond = 0x100 - (timeDivision >> 8)
result.ticksPerFrame = timeDivision & 0xFF
} else {
result.ticksPerBeat = timeDivision
}
return result
}
function parseTrack(data) {
var p = new Parser(data)
var events = []
while (!p.eof()) {
var event = readEvent()
events.push(event)
}
return events
var lastEventTypeByte = null
function readEvent() {
var event = {}
event.deltaTime = p.readVarInt()
var eventTypeByte = p.readUInt8()
if ((eventTypeByte & 0xf0) === 0xf0) {
// system / meta event
if (eventTypeByte === 0xff) {
// meta event
event.meta = true
var metatypeByte = p.readUInt8()
var length = p.readVarInt()
switch (metatypeByte) {
case 0x00:
event.type = 'sequenceNumber'
if (length !== 2) throw "Expected length for sequenceNumber event is 2, got " + length
event.number = stream.readUInt16()
return event
case 0x01:
event.type = 'text'
event.text = p.readString(length)
return event
case 0x02:
event.type = 'copyrightNotice'
event.text = p.readString(length)
return event
case 0x03:
event.type = 'trackName'
event.text = p.readString(length)
return event
case 0x04:
event.type = 'instrumentName'
event.text = p.readString(length)
return event
case 0x05:
event.type = 'lyrics'
event.text = p.readString(length)
return event
case 0x06:
event.type = 'marker'
event.text = p.readString(length)
return event
case 0x07:
event.type = 'cuePoint'
event.text = p.readString(length)
return event
case 0x20:
event.type = 'channelPrefix'
if (length != 1) throw "Expected length for channelPrefix event is 1, got " + length
event.channel = p.readUInt8()
return event
case 0x21:
event.type = 'portPrefix'
if (length != 1) throw "Expected length for portPrefix event is 1, got " + length
event.port = p.readUInt8()
return event
case 0x2f:
event.type = 'endOfTrack'
if (length != 0) throw "Expected length for endOfTrack event is 0, got " + length
return event
case 0x51:
event.type = 'setTempo';
if (length != 3) throw "Expected length for setTempo event is 3, got " + length
event.microsecondsPerBeat = p.readUInt24()
return event
case 0x54:
event.type = 'smpteOffset';
if (length != 5) throw "Expected length for smpteOffset event is 5, got " + length
var hourByte = p.readUInt8()
var FRAME_RATES = { 0x00: 24, 0x20: 25, 0x40: 29, 0x60: 30 }
event.frameRate = FRAME_RATES[hourByte & 0x60]
event.hour = hourByte & 0x1f
event.min = p.readUInt8()
event.sec = p.readUInt8()
event.frame = p.readUInt8()
event.subFrame = p.readUInt8()
return event
case 0x58:
event.type = 'timeSignature'
if (length != 4) throw "Expected length for timeSignature event is 4, got " + length
event.numerator = p.readUInt8()
event.denominator = (1 << p.readUInt8())
event.metronome = p.readUInt8()
event.thirtyseconds = p.readUInt8()
return event
case 0x59:
event.type = 'keySignature'
if (length != 2) throw "Expected length for keySignature event is 2, got " + length
event.key = p.readInt8()
event.scale = p.readUInt8()
return event
case 0x7f:
event.type = 'sequencerSpecific'
event.data = p.readBytes(length)
return event
default:
event.type = 'unknownMeta'
event.data = p.readBytes(length)
event.metatypeByte = metatypeByte
return event
}
} else if (eventTypeByte == 0xf0) {
event.type = 'sysEx'
var length = p.readVarInt()
event.data = p.readBytes(length)
return event
} else if (eventTypeByte == 0xf7) {
event.type = 'endSysEx'
var length = p.readVarInt()
event.data = p.readBytes(length)
return event
} else {
throw "Unrecognised MIDI event type byte: " + eventTypeByte
}
} else {
// channel event
var param1
if ((eventTypeByte & 0x80) === 0) {
// running status - reuse lastEventTypeByte as the event type.
// eventTypeByte is actually the first parameter
if (lastEventTypeByte === null)
throw "Running status byte encountered before status byte"
param1 = eventTypeByte
eventTypeByte = lastEventTypeByte
event.running = true
} else {
param1 = p.readUInt8()
lastEventTypeByte = eventTypeByte
}
var eventType = eventTypeByte >> 4
event.channel = eventTypeByte & 0x0f
switch (eventType) {
case 0x08:
event.type = 'noteOff'
event.noteNumber = param1
event.velocity = p.readUInt8()
return event
case 0x09:
var velocity = p.readUInt8()
event.type = velocity === 0 ? 'noteOff' : 'noteOn'
event.noteNumber = param1
event.velocity = velocity
if (velocity === 0) event.byte9 = true
return event
case 0x0a:
event.type = 'noteAftertouch'
event.noteNumber = param1
event.amount = p.readUInt8()
return event
case 0x0b:
event.type = 'controller'
event.controllerType = param1
event.value = p.readUInt8()
return event
case 0x0c:
event.type = 'programChange'
event.programNumber = param1
return event
case 0x0d:
event.type = 'channelAftertouch'
event.amount = param1
return event
case 0x0e:
event.type = 'pitchBend'
event.value = (param1 + (p.readUInt8() << 7)) - 0x2000
return event
default:
throw "Unrecognised MIDI event type: " + eventType
}
}
}
}
function Parser(data) {
this.buffer = data
this.bufferLen = this.buffer.length
this.pos = 0
}
Parser.prototype.eof = function() {
return this.pos >= this.bufferLen
}
Parser.prototype.readUInt8 = function() {
var result = this.buffer[this.pos]
this.pos += 1
return result
}
Parser.prototype.readInt8 = function() {
var u = this.readUInt8()
if (u & 0x80)
return u - 0x100
else
return u
}
Parser.prototype.readUInt16 = function() {
var b0 = this.readUInt8(),
b1 = this.readUInt8()
return (b0 << 8) + b1
}
Parser.prototype.readInt16 = function() {
var u = this.readUInt16()
if (u & 0x8000)
return u - 0x10000
else
return u
}
Parser.prototype.readUInt24 = function() {
var b0 = this.readUInt8(),
b1 = this.readUInt8(),
b2 = this.readUInt8()
return (b0 << 16) + (b1 << 8) + b2
}
Parser.prototype.readInt24 = function() {
var u = this.readUInt24()
if (u & 0x800000)
return u - 0x1000000
else
return u
}
Parser.prototype.readUInt32 = function() {
var b0 = this.readUInt8(),
b1 = this.readUInt8(),
b2 = this.readUInt8(),
b3 = this.readUInt8()
return (b0 << 24) + (b1 << 16) + (b2 << 8) + b3
}
Parser.prototype.readBytes = function(len) {
var bytes = this.buffer.slice(this.pos, this.pos + len)
this.pos += len
return bytes
}
Parser.prototype.readString = function(len) {
var bytes = this.readBytes(len)
return String.fromCharCode.apply(null, bytes)
}
Parser.prototype.readVarInt = function() {
var result = 0
while (!this.eof()) {
var b = this.readUInt8()
if (b & 0x80) {
result += (b & 0x7f)
result <<= 7
} else {
// b is last byte
return result + b
}
}
// premature eof
return result
}
Parser.prototype.readChunk = function() {
var id = this.readString(4)
var length = this.readUInt32()
var data = this.readBytes(length)
return {
id: id,
length: length,
data: data
}
}
module.exports = parseMidi
},{}],4:[function(require,module,exports){
// data should be the same type of format returned by parseMidi
// for maximum compatibililty, returns an array of byte values, suitable for conversion to Buffer, Uint8Array, etc.
// opts:
// - running reuse previous eventTypeByte when possible, to compress file
// - useByte9ForNoteOff use 0x09 for noteOff when velocity is zero
function writeMidi(data, opts) {
if (typeof data !== 'object')
throw 'Invalid MIDI data'
opts = opts || {}
var header = data.header || {}
var tracks = data.tracks || []
var i, len = tracks.length
var w = new Writer()
writeHeader(w, header, len)
for (i=0; i < len; i++) {
writeTrack(w, tracks[i], opts)
}
return w.buffer
}
function writeHeader(w, header, numTracks) {
var format = header.format == null ? 1 : header.format
var timeDivision = 128
if (header.timeDivision) {
timeDivision = header.timeDivision
} else if (header.ticksPerFrame && header.framesPerSecond) {
timeDivision = (-(header.framesPerSecond & 0xFF) << 8) | (ticksPerFrame & 0xFF)
} else if (header.ticksPerBeat) {
timeDivision = header.ticksPerBeat & 0x7FFF
}
var h = new Writer()
h.writeUInt16(format)
h.writeUInt16(numTracks)
h.writeUInt16(timeDivision)
w.writeChunk('MThd', h.buffer)
}
function writeTrack(w, track, opts) {
var t = new Writer()
var i, len = track.length
var eventTypeByte = null
for (i=0; i < len; i++) {
// Reuse last eventTypeByte when opts.running is set, or event.running is explicitly set on it.
// parseMidi will set event.running for each event, so that we can get an exact copy by default.
// Explicitly set opts.running to false, to override event.running and never reuse last eventTypeByte.
if (opts.running === false || !opts.running && !track[i].running) eventTypeByte = null
eventTypeByte = writeEvent(t, track[i], eventTypeByte, opts.useByte9ForNoteOff)
}
w.writeChunk('MTrk', t.buffer)
}
function writeEvent(w, event, lastEventTypeByte, useByte9ForNoteOff) {
var type = event.type
var deltaTime = event.deltaTime
var text = event.text || ''
var data = event.data || []
var eventTypeByte = null
w.writeVarInt(deltaTime)
switch (type) {
// meta events
case 'sequenceNumber':
w.writeUInt8(0xFF)
w.writeUInt8(0x00)
w.writeVarInt(2)
w.writeUInt16(event.number)
break;
case 'text':
w.writeUInt8(0xFF)
w.writeUInt8(0x01)
w.writeVarInt(text.length)
w.writeString(text)
break;
case 'copyrightNotice':
w.writeUInt8(0xFF)
w.writeUInt8(0x02)
w.writeVarInt(text.length)
w.writeString(text)
break;
case 'trackName':
w.writeUInt8(0xFF)
w.writeUInt8(0x03)
w.writeVarInt(text.length)
w.writeString(text)
break;
case 'instrumentName':
w.writeUInt8(0xFF)
w.writeUInt8(0x04)
w.writeVarInt(text.length)
w.writeString(text)
break;
case 'lyrics':
w.writeUInt8(0xFF)
w.writeUInt8(0x05)
w.writeVarInt(text.length)
w.writeString(text)
break;
case 'marker':
w.writeUInt8(0xFF)
w.writeUInt8(0x06)
w.writeVarInt(text.length)
w.writeString(text)
break;
case 'cuePoint':
w.writeUInt8(0xFF)
w.writeUInt8(0x07)
w.writeVarInt(text.length)
w.writeString(text)
break;
case 'channelPrefix':
w.writeUInt8(0xFF)
w.writeUInt8(0x20)
w.writeVarInt(1)
w.writeUInt8(event.channel)
break;
case 'portPrefix':
w.writeUInt8(0xFF)
w.writeUInt8(0x21)
w.writeVarInt(1)
w.writeUInt8(event.port)
break;
case 'endOfTrack':
w.writeUInt8(0xFF)
w.writeUInt8(0x2F)
w.writeVarInt(0)
break;
case 'setTempo':
w.writeUInt8(0xFF)
w.writeUInt8(0x51)
w.writeVarInt(3)
w.writeUInt24(event.microsecondsPerBeat)
break;
case 'smpteOffset':
w.writeUInt8(0xFF)
w.writeUInt8(0x54)
w.writeVarInt(5)
var FRAME_RATES = { 24: 0x00, 25: 0x20, 29: 0x40, 30: 0x60 }
var hourByte = (event.hour & 0x1F) | FRAME_RATES[event.frameRate]
w.writeUInt8(hourByte)
w.writeUInt8(event.min)
w.writeUInt8(event.sec)
w.writeUInt8(event.frame)
w.writeUInt8(event.subFrame)
break;
case 'timeSignature':
w.writeUInt8(0xFF)
w.writeUInt8(0x58)
w.writeVarInt(4)
w.writeUInt8(event.numerator)
var denominator = Math.floor((Math.log(event.denominator) / Math.LN2)) & 0xFF
w.writeUInt8(denominator)
w.writeUInt8(event.metronome)
w.writeUInt8(event.thirtyseconds || 8)
break;
case 'keySignature':
w.writeUInt8(0xFF)
w.writeUInt8(0x59)
w.writeVarInt(2)
w.writeInt8(event.key)
w.writeUInt8(event.scale)
break;
case 'sequencerSpecific':
w.writeUInt8(0xFF)
w.writeUInt8(0x7F)
w.writeVarInt(data.length)
w.writeBytes(data)
break;
case 'unknownMeta':
if (event.metatypeByte != null) {
w.writeUInt8(0xFF)
w.writeUInt8(event.metatypeByte)
w.writeVarInt(data.length)
w.writeBytes(data)
}
break;
// system-exclusive
case 'sysEx':
w.writeUInt8(0xF0)
w.writeVarInt(data.length)
w.writeBytes(data)
break;
case 'endSysEx':
w.writeUInt8(0xF7)
w.writeVarInt(data.length)
w.writeBytes(data)
break;
// channel events
case 'noteOff':
// Use 0x90 when opts.useByte9ForNoteOff is set and velocity is zero, or when event.byte9 is explicitly set on it.
// parseMidi will set event.byte9 for each event, so that we can get an exact copy by default.
// Explicitly set opts.useByte9ForNoteOff to false, to override event.byte9 and always use 0x80 for noteOff events.
var noteByte = ((useByte9ForNoteOff !== false && event.byte9) || (useByte9ForNoteOff && event.velocity == 0)) ? 0x90 : 0x80
eventTypeByte = noteByte | event.channel
if (eventTypeByte !== lastEventTypeByte) w.writeUInt8(eventTypeByte)
w.writeUInt8(event.noteNumber)
w.writeUInt8(event.velocity)
break;
case 'noteOn':