const fs = require('fs');

const midiBuffer = fs.readFileSync('song.mid');
const midiBytes = Array.from(midiBuffer);

var midiString = Buffer.from(midiBytes).toString('base64');

let code = `
var BASE64_CHARS="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
function base64ToBytes(str){var clean=(str||"").replace(/=+$/,""),out=[];for(var i=0;i<clean.length;i+=4){var n=(BASE64_CHARS.indexOf(clean.charAt(i))<<18)|(BASE64_CHARS.indexOf(clean.charAt(i+1))<<12)|(BASE64_CHARS.indexOf(clean.charAt(i+2)||'A')<<6)|(BASE64_CHARS.indexOf(clean.charAt(i+3)||'A'));out.push((n>>16)&0xFF);if(clean.charAt(i+2)&&clean.charAt(i+2)!=='=')out.push((n>>8)&0xFF);if(clean.charAt(i+3)&&clean.charAt(i+3)!=='=')out.push(n&0xFF);}return out;}
function readVarLen(bytes,i){var value=0,b;do{b=bytes[i++];value=(value<<7)|(b&0x7F);}while(b&0x80);return {value,nextIndex:i};}
function splitTracks(bytes){var i=0;if(String.fromCharCode(bytes[i],bytes[i+1],bytes[i+2],bytes[i+3])!=='MThd')throw new Error('Invalid MIDI header');var hl=(bytes[i+4]<<24)|(bytes[i+5]<<16)|(bytes[i+6]<<8)|bytes[i+7];var format=(bytes[i+8]<<8)|bytes[i+9],nTracks=(bytes[i+10]<<8)|bytes[i+11],tpq=(bytes[i+12]<<8)|bytes[i+13];i+=8+hl;var tracks=[];for(var t=0;t<nTracks;t++){if(String.fromCharCode(bytes[i],bytes[i+1],bytes[i+2],bytes[i+3])!=='MTrk')throw new Error('Invalid track header');var tl=(bytes[i+4]<<24)|(bytes[i+5]<<16)|(bytes[i+6]<<8)|bytes[i+7];tracks.push(bytes.slice(i+8,i+8+tl));i+=8+tl;}return{format,tpq,tracks};}
function parseTrackToEvents(bytes){var events=[],i=0,tick=0,lastStatus=null;while(i<bytes.length){var dt=readVarLen(bytes,i);tick+=dt.value;i=dt.nextIndex;if(i>=bytes.length)break;var statusByte=bytes[i],status;if(statusByte>=0x80){status=statusByte;lastStatus=status;i++;}else{if(!lastStatus)break;status=lastStatus;}var cmd=status&0xF0,channel=status&0x0F;if(status===0xFF){var mt=bytes[i++],lenInfo=readVarLen(bytes,i),len=lenInfo.value;i=lenInfo.nextIndex+len;if(mt===0x51&&len===3){var tempo=(bytes[i-3]<<16)|(bytes[i-2]<<8)|bytes[i-1];events.push({tick,type:"setTempo",tempo});}continue;}if(cmd===0xC0){var program=bytes[i++];events.push({tick,type:"programChange",channel,program});continue;}if(cmd===0x90||cmd===0x80){var d1=bytes[i++],d2=bytes[i++];if(cmd===0x90&&d2>0)events.push({tick,type:"noteOn",note:d1,velocity:d2,channel});else events.push({tick,type:"noteOff",note:d1,channel});continue;}if(cmd===0xA0||cmd===0xB0||cmd===0xE0){i+=2;continue;}if(cmd===0xD0){i+=1;continue;}i++;}return events;}
function ticksToSecondsAndNotes(bytes){var midi=splitTracks(bytes),tpq=midi.tpq,all=[];for(var t=0;t<midi.tracks.length;t++){var evs=parseTrackToEvents(midi.tracks[t]);for(var k=0;k<evs.length;k++)all.push(evs[k]);}all.sort((a,b)=>a.tick-b.tick);var tempo=500000;for(var i=0;i<all.length;i++){if(all[i].type==="setTempo"){tempo=all[i].tempo;break;}}var lastTick=0,lastSec=0;for(var i=0;i<all.length;i++){var ev=all[i];var dt=ev.tick-lastTick;var secDelta=(dt*tempo)/(tpq*1000000);lastSec+=secDelta;ev.time=lastSec;if(ev.type==="setTempo")tempo=ev.tempo;lastTick=ev.tick;}var notes=[],openNotes={},channelPrograms=new Array(16).fill(0);for(var j=0;j<all.length;j++){var e=all[j];if(e.type==="programChange")channelPrograms[e.channel]=e.program;if(e.type==="noteOn")openNotes[e.note+"_"+e.channel]={start:e.time,velocity:e.velocity,channel:e.channel,program:channelPrograms[e.channel]};if(e.type==="noteOff"){var key=e.note+"_"+e.channel;if(openNotes[key]){var s=openNotes[key].start,v=openNotes[key].velocity,dur=e.time-s;if(dur<0)dur=0;notes.push({note:e.note,velocity:v,time:s,duration:dur,channel:e.channel,program:openNotes[key].program});delete openNotes[key];}}}return{notes,tpq,channelPrograms};}
function createPlayerFromBase64(base64String){var bytes=base64ToBytes(base64String);var parsed=ticksToSecondsAndNotes(bytes);var notes=parsed.notes;return function(t){var out=[];for(var i=0;i<notes.length;i++){var e=notes[i];if(t>=e.time&&t<e.time+e.duration)out.push({note:e.note,frequency:440*Math.pow(2,(e.note-69)/12),velocity:e.velocity,time:e.time,duration:e.duration,channel:e.channel,program:e.program});}return out;};}
function envelope(t,n){let dt=t-n.time;if(dt<0||dt>n.duration)return 0;let a=0.005,d=0.12,s=0.7,r=0.25,st=Math.max(0,n.duration-a-d-r);if(dt<a)return dt/a;dt-=a;if(dt<d)return 1-(1-s)*(dt/d);dt-=d;if(dt<st)return s;dt-=st;if(dt<r)return s*(1-dt/r);return 0;}
function harmonicWave(type,f,t){switch(type){case"sine":return Math.sin(2*Math.PI*f*t)+0.5*Math.sin(2*Math.PI*2*f*t)+0.25*Math.sin(2*Math.PI*3*f*t);case"triangle":return 2/Math.PI*Math.asin(Math.sin(2*Math.PI*f*t));case"square":return Math.sign(Math.sin(2*Math.PI*f*t));case"sawtooth":return 2*(f*t-Math.floor(f*t+0.5));case"softSine":return Math.sin(2*Math.PI*f*t)*0.8+Math.sin(2*Math.PI*2*f*t)*0.2;case"brightSaw":return 2*(f*t-Math.floor(f*t));default:return Math.sin(2*Math.PI*f*t);}}
function instrumentWave(program){program=Math.max(0,Math.min(127,program));var waves=["sine","softSine","triangle","square","sawtooth","brightSaw","softSine","triangle","sine","square","sawtooth","triangle","softSine","brightSaw","sine","triangle"];return waves[program%waves.length];}
function synthNote(n,t){return harmonicWave(instrumentWave(n.program),440*Math.pow(2,(n.note-69)/12),t)*Math.pow(n.velocity/127,0.8)*envelope(t,n);}
function drumWave(n,t){let dt=t-n.time;if(dt<0||dt>n.duration)return 0;function clamp(x){return Math.max(-1,Math.min(1,x));}switch(n.note){case 35:case 36:return clamp(Math.sin(2*Math.PI*60*dt)*Math.exp(-dt*12)+(Math.random()*2-1)*Math.exp(-dt*150));case 38:case 40:return clamp((Math.random()*2-1)*Math.exp(-dt*60)+Math.sin(2*Math.PI*180*dt)*Math.exp(-dt*30)+Math.sin(2*Math.PI*330*dt)*Math.exp(-dt*25));case 41:case 43:case 45:case 47:case 49:case 51:case 53:case 55:case 57:case 59:return clamp((Math.random()*2-1)*Math.exp(-dt*200));case 42:case 44:case 46:case 48:case 50:case 52:case 54:case 56:case 58:case 60:return clamp((Math.random()*2-1)*Math.exp(-dt*150));default:return 0;}}
function makeSynth(base64Midi){var getActiveNotesAtTime=createPlayerFromBase64(base64Midi);var state={hpL:{x:0,y:0},hpR:{x:0,y:0}};return function(t,sr){var active=getActiveNotesAtTime(t);var L=0,R=0,wL=0,wR=0;for(var i=0;i<active.length;i++){var n=active[i];var sig=n.channel===9?drumWave(n,t):synthNote(n,t);var pan=0.5+0.5*Math.sin(n.note/50+t*0.05);L+=sig*(1-pan);R+=sig*pan;wL+=Math.pow(n.velocity/127,0.8)*(1-pan);wR+=Math.pow(n.velocity/127,0.8)*pan;}if(wL>0)L/=wL;if(wR>0)R/=wR;var dt=1/sr;var hpL=state.hpL.y+0.5*(L-state.hpL.y)*dt*44100;state.hpL.y=hpL;var hpR=state.hpR.y+0.5*(R-state.hpR.y)*dt*44100;state.hpR.y=hpR;return [hpL,hpR];};}
var synth = makeSynth(`+'`'+midiString+'`'+`);
return synth`

fs.writeFileSync('output.txt', code);