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<textarea id=area>
['s',['n', 60, 1, 100,1], ['n', 64, 1], ['n', 67, 1], ['c',['n', 60, 1], ['n', 64, 1], ['n', 67]]]
</textarea>
<button id="b1">play</button>
<midi-player
id="player1" sound-font visualizer="#myPianoRollVisualizer">
</midi-player>
<midi-visualizer type="piano-roll" id="myPianoRollVisualizer" >
</midi-visualizer>
<script src="https://cdn.jsdelivr.net/combine/npm/tone@14.7.58,npm/@magenta/music@1.23.1/es6/core.js,npm/focus-visible@5,npm/html-midi-player@1.5.0"></script>
<p>For more information for this player, see <a href="https://github.com/cifkao/html-midi-player" target="_blank">the <strong>html-midi-player</strong> repository</a> on GitHub.</p>
#area {
width: 100%;
height: auto;
rows: 5;
box-sizing: border-box;
}
var TICK=960;
var NOFF = "%8";
var NON = "%9";
var PCHANGE = "%C";
var PITCH_REST = 128;
var TYPE = 0;
var PITCH = 1;
var DURATION = 2;
var POSITION = 2;
var VELOCITY = 3;
var INST = 4;
const DRUM = 129;
const DRUM_CHANNEL = 9; //channel:10 のインデックスは9
function encodeValue(l,m){
if(!m){ m = 0;}
// alert(l);
var tl = "0"+(parseInt(l)|m).toString(16);
return "%"+tl.substring(tl.length -2);
}
function encodeLength(l){
if(l > 127){
var m = 1;
while((tl = Math.floor(l/m)) > 127){
m *= 128;
}
return encodeValue(tl,0x80)+encodeLength(l%m);
} else {
return encodeValue(l);
}
}
function length4bytes(l){
var m = 256*256*256;
var r = "";
for(var i = 0; i <4 ; i ++){
var tl = Math.floor(l/m);
r += encodeValue(tl);
m = m / 256;
}
return r;
}
function toHex2(i){
var r = i.toString(16);
if(r.length < 2){
r = '0'+r;
}
return '%'+r;
}
function createSMF(a){
var tl;
var r = "";
for(var i = 0; i < a.length; i ++){
r += a[i];
tl += a[i].length/3;
}
return "MThd"+length4bytes(6)+"%00%01%00"+encodeValue(a.length)+"%03%C0"+r;
//トラック数上限255
//tick 960 テンポはトラック内%ff%51
}
function createTrack(a, tempo){
if(!tempo){ tempo = 120;}
if(tempo < 1){ tempo = 120;}
// alert("tempo:"+tempo);
var td = '%00%FF%51%03'+length4bytes(60*1000000/tempo).substring(3);
var ld = '%00%FF%2F%00'
return "MTrk"+length4bytes((a.length+td.length+ld.length)/3)+td+a+ld;
}
function fillDefault(n, dn){
// alert("fd n:"+n+" dn:"+dn);
if(n.length < DURATION+1 || n[DURATION] < 0){
n[DURATION] = dn[DURATION];
}
if(n.length < VELOCITY+1 || [VELOCITY] < 0){
n[VELOCITY] = dn[VELOCITY];
}
// alert("not defined l:"+n.length);
// alert(n[INST]);
if(n.length < INST+1 || n[INST] < 0){
// alert("i not defined l:"+n.length);
n[INST] = dn[INST];
}
dn[0] = n[0]; dn[1] = n[1]; dn[2] = n[2];
dn[3] = n[3]; dn[4] = n[4];
return n;
}
/*配列をコンパイル前の内部配列にする
音の情報からonとoffを生成して並べる
副作用でdwnがかわる */
function precompileArray(dest, src, pos, dwn){
// alert("cA");
if(!pos){ pos = 0;}
if(!dwn){ dwn = ['n',64,1,64,0];}
if(src[TYPE] == 'n'){
// alert("dwn;"+dwn);
var nn = fillDefault(src, dwn);
if(nn[PITCH] < PITCH_REST){
insertNote(dest, nn, pos);
}
//alert(dwn);
if(LAST_POS < pos+nn[DURATION]){
LAST_POS = pos+nn[DURATION];
}
return pos+nn[DURATION];
} else if(src[TYPE] == 's'){
var cp = pos;
for(var i = 1; i < src.length; i ++){
cp = precompileArray(dest, src[i], cp, dwn);
}
return cp;
} else if(src[TYPE] == 'c'){
var cp = pos;
for(var i = 1; i < src.length; i ++){
var tcp = precompileArray(dest, src[i], pos, dwn);
if(cp < tcp){ cp = tcp;} //MAX
}
return cp;
}
}
//内部配列を生成する
//n値がそろっている,全体で一つの配列になる
//
function insertNote(a, n, pos){
var pit = n[PITCH];
var dur = n[DURATION];
var vel= n[VELOCITY];
var inst = n[INST];
var i = 0;
var non = [NON, pit, pos, vel,inst ];
var noff = [NOFF, pit, pos+dur, vel, inst];
for(; i < a.length && non; i ++){
if(a[i][POSITION] > non[POSITION]){
a.splice(i, 0, non);
non = false;
}
}
//alert("i:"+i +" non:"+non);
if(non){
a.splice(a.length, 0, non);
}
for(; i < a.length && noff; i ++){
if(a[i][POSITION] >= noff[POSITION]){
a.splice(i, 0, noff);
noff = false;
}
}
//alert("i:"+i+ " noff:"+noff);
if(noff){
a.splice(a.length, 0, noff);
}
// alert(a.length);
}
function removeNoteoff(a){
var count = {}
var r = Array()
console.log(a)
for(var i = 0; i < a.length; i ++){
var ri = a[i]
console.log(ri)
if(ri[TYPE] == NON){
if(!count[ri[PITCH]]){
count[ri[PITCH]] = 0
}
count[ri[PITCH]] ++
} else if(ri[TYPE] == NOFF){
count[ri[PITCH]] --
if(count[ri[PITCH]] > 0){
ri = false
}
}
if(ri){
r.splice(r.length, 0, ri)
}
}
}
//配列を楽器別に分類して、楽器別にチャンネルを作り15個まとめてトラックを作ってバイナリ化
function compileArray(a){
var r = new Array();
//楽器別に分類
//alert(a)
for(var i = 0; i < a.length; i ++){
//alert(a[i]);
var ins = a[i][INST];
if(!r[ins]){ r[ins] = new Array();}
r[ins].push(a[i]);
}
//楽器別に分類したものをチャンネルにまとめる
var channel;
var ctr = false;
var tr = new Array();
for(var i = 0; i < r.length; i ++){
if(r[i]){
if(!ctr){
channel = 0;
ctr = new Array();
tr.push(ctr);
}
for(var j = 0; j < r[i].length; j ++){
var c = r[i][j];
for(var l = 0; l < ctr.length && c; l ++){
if(c[POSITION] < ctr[l][POSITION]){
ctr.splice(l, 0, c);
c = false;
}
}
if(c){
ctr.push(c);
}
}
ctr = false;//1一楽器一トラック 一トラック複数楽器には対応していないプレイヤーがある
/*
channel ++;
if(channel > 14){
channel = 0;
ctr = false;
}
*/
}
}
// return tr;
//trには16音色ごとにチャンネル別にまとめられた配列の配列
//チャンネルを一つの配列に
var tr2 = new Array();
for(var i = 0; i < tr.length; i ++){
var insts = new Object();
var instsi = 0;
var dt = ""; var cp = 0;
//音色をチャンネルに割り振る
// TODO: ドラムを9chにその他は順次割り振る
insts[DRUM] = DRUM_CHANNEL;
for(var j = 0; j < tr[i].length; j ++){
var del = Math.floor((tr[i][j][POSITION] -cp)*TICK);
cp = tr[i][j][POSITION];
if(!insts[tr[i][j][INST]]){
insts[tr[i][j][INST]] = instsi.toString(16); //常に一桁のはず
dt += '%00'+PCHANGE+insts[tr[i][j][INST]]+toHex2(tr[i][j][INST]&0x7f);
instsi ++;
if(instsi == DRUM_CHANNEL){
instsi ++;
}
}
dt += encodeLength(del)+tr[i][j][TYPE]+insts[tr[i][j][INST]];
dt += toHex2(tr[i][j][PITCH])+toHex2(tr[i][j][VELOCITY]);
}
tr2.push(dt);
}
//trには音色が混じったチャンネル別に配列にまとめられた配列
//配列をバイナリ化
return tr2;
}
var LAST_POS = 0; //
function compileArrayString(s, tempo){
LAST_POS = 0;
var t = eval(s);
var dest = new Array();
precompileArray(dest, t);
//alert("dest:"+dest)
//dest = dest.map(removeNoteoff)
//alert("dest:"+dest)
dest = compileArray(dest);
var tr = new Array();
for(var j = 0; j < dest.length; j ++){
tr.push(createTrack(dest[j], tempo));
}
return 'data:audio/midi,'+ createSMF(tr);
}
function compileArrayToDatascheme(t, tempo){
LAST_POS = 0;
var dest = new Array();
precompileArray(dest, t);
//alert(t+ "dest:"+ dest+ ":")
//dest = dest.map(removeNoteoff)
//alert("dest:"+ dest+ ":")
dest = compileArray(dest);
var tr = new Array();
for(var j = 0; j < dest.length; j ++){
tr.push(createTrack(dest[j], tempo));
}
return 'data:audio/midi,'+ createSMF(tr);
}
//とりあえず完成 2010.11.8
//デバッグまだ
//noteoffが複数の場合削る機能がまだ
//exports.compile = compileArrayString
//exports.
const toUint8Array = function(s){
var res = new Array();
var resi = 0
var i = s.indexOf(",")+1;
while(i < s.length){
var si = s.charCodeAt(i);
if(si == "+".charCodeAt(0)){
si = " ".charCodeAt(0);
} else if(si == "%".charCodeAt(0)){
si = s.charAt(i+1)+s.charAt(i+2);
i++; i++;
si = parseInt(si, 16);
}
res[resi] = si
i++;
resi ++
}
return new Uint8Array(res)
}
window.addEventListener('load', ()=>{
document.getElementById("player1").addEventListener('load', ()=>{
document.getElementById("player1").start()
})
document.getElementById("b1").addEventListener('click', ()=>{
//alert(area.value)
document.getElementById("player1").src = compileArrayString(area.value, 120)
//alert("r:"+compileArrayToDatascheme(a, 120))
})
})
Also see: Tab Triggers