├── .gitignore
├── LICENSE
├── README.md
├── bin
    ├── defaults.json
    ├── synth.js
    └── utils
    │   └── args.js
├── dst
    ├── synth.min.js
    └── synth.min.js.map
├── gulp
    ├── config.json
    └── tasks
    │   ├── browserify.js
    │   └── default.js
├── gulpfile.js
├── index.js
├── man
    ├── help.txt
    └── synth.1
├── package.json
└── src
    ├── midi.js
    ├── midi2wav.js
    ├── utils
        └── timer.js
    └── wav.js


/.gitignore:
--------------------------------------------------------------------------------
 1 | *.DS_Store
 2 | ._*
 3 | 
 4 | examples
 5 | 
 6 | node_modules
 7 | coverage
 8 | npm-debug.log*
 9 | 
10 | .npm
11 | .env
12 | 


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | Copyright (c) 2017 Patrick Roberts
 2 | 
 3 | Permission is hereby granted, free of charge, to any person obtaining a copy
 4 | of this software and associated documentation files (the "Software"), to deal
 5 | in the Software without restriction, including without limitation the rights
 6 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 7 | copies of the Software, and to permit persons to whom the Software is
 8 | furnished to do so, subject to the following conditions:
 9 | 
10 | The above copyright notice and this permission notice shall be included in all
11 | copies or substantial portions of the Software.
12 | 
13 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
19 | SOFTWARE.
20 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
  1 | # synth-js
  2 | 
  3 | Command-line utility and Node module for generating raw audio data from MIDI files.
  4 | 
  5 | ## Installation
  6 | 
  7 | ### Command-line utility:
  8 | 
  9 | ```bash
 10 | $ npm link synth-js
 11 | ```
 12 | 
 13 | ### Node module:
 14 | 
 15 | ```bash
 16 | $ npm install --save synth-js
 17 | ```
 18 | 
 19 | ### JavaScript:
 20 | 
 21 | ```html
 22 | <script src="synth.min.js"></script>
 23 | ```
 24 | 
 25 | After including the file from `dst/synth.min.js`, the global variable `synth` will be initialized.
 26 | 
 27 | ## Usage
 28 | 
 29 | ### Command-line utility:
 30 | 
 31 | ```bash
 32 | # assuming song.mid in cwd
 33 | $ synth -i song
 34 | # now song.wav contains raw audio data for song.mid
 35 | ```
 36 | 
 37 | ### Node module:
 38 | 
 39 | ```js
 40 | const synth = require('synth-js');
 41 | const fs = require('fs');
 42 | 
 43 | let midBuffer = fs.readFileSync('song.mid');
 44 | // convert midi buffer to wav buffer
 45 | let wavBuffer = synth.midiToWav(midiBuffer).toBuffer();
 46 | 
 47 | fs.writeFileSync('song.wav', wavBuffer, {encoding: 'binary'});
 48 | ```
 49 | 
 50 | ### JavaScript:
 51 | 
 52 | ```html
 53 | <style>
 54 |   #wav:after {
 55 |     content: " " attr(download);
 56 |   }
 57 | 
 58 |   #wav:not([href]) {
 59 |     display: none;
 60 |   }
 61 | </style>
 62 | <input type="file" id="midi" accept="audio/midi">
 63 | <a id="wav">Download</a>
 64 | <script>
 65 |   var audio;
 66 |   var input = document.getElementById('midi');
 67 |   var anchor = document.getElementById('wav');
 68 | 
 69 |   input.addEventListener('change', function change() {
 70 |     // clean up previous song, if any
 71 |     if (anchor.hasAttribute('href')) {
 72 |       URL.revokeObjectURL(anchor.href);
 73 |       anchor.removeAttribute('href');
 74 | 
 75 |       if (audio && !audio.paused) {
 76 |         audio.pause();
 77 |       }
 78 |     }
 79 | 
 80 |     // check if file exists
 81 |     if (input.files.length > 0) {
 82 |       var reader = new FileReader();
 83 |       var midName = input.files[0].name;
 84 |       // replace file extension with .wav
 85 |       var wavName = midName.replace(/\..+?$/, '.wav');
 86 | 
 87 |       // set callback for array buffer
 88 |       reader.addEventListener('load', function load(event) {
 89 |         // convert midi arraybuffer to wav blob
 90 |         var wav = synth.midiToWav(event.target.result).toBlob();
 91 |         // create a temporary URL to the wav file
 92 |         var src = URL.createObjectURL(wav);
 93 | 
 94 |         audio = new Audio(src);
 95 |         audio.play();
 96 | 
 97 |         anchor.setAttribute('href', src);
 98 |       });
 99 | 
100 |       // read the file as an array buffer
101 |       reader.readAsArrayBuffer(input.files[0]);
102 | 
103 |       // set the name of the wav file
104 |       anchor.setAttribute('download', wavName);
105 |     }
106 |   });
107 | </script>
108 | ```
109 | 
110 | See the demo [here][browser-demo].
111 | 
112 | ## FAQ
113 | 
114 | ### Where can I find documentation?
115 | 
116 | Currently, documentation only exists for the command-line utility.
117 | To access it, use `man`:
118 | 
119 | ```bash
120 | $ man synth
121 | ```
122 | 
123 | For Node or JavaScript, refer to the `src/` directory for accessible APIs:
124 | 
125 | * `synth.WAV()`
126 | * `synth.MIDIStream()`
127 | * `synth.midiToWav()`
128 | 
129 | ## License
130 | 
131 | Available under the MIT License
132 | 
133 | [browser-demo]: https://jsfiddle.net/patrob10114/o5r1adyz/show/
134 | 


--------------------------------------------------------------------------------
/bin/defaults.json:
--------------------------------------------------------------------------------
1 | {
2 |   "DryRun": false,
3 |   "help": false,
4 |   "sampleRate": 44100,
5 |   "bitsPerSample": 16,
6 |   "duration": 1,
7 |   "Skip": []
8 | }
9 | 


--------------------------------------------------------------------------------
/bin/synth.js:
--------------------------------------------------------------------------------
 1 | #!/usr/bin/env node
 2 | 'use strict';
 3 | 
 4 | const fs = require('fs');
 5 | const midiToWav = require('../src/midi2wav');
 6 | const getArgs = require('./utils/args');
 7 | 
 8 | try {
 9 |   const args = getArgs(process.argv);
10 | 
11 |   if (args.help || args.input === undefined) {
12 |     return console.log(fs.readFileSync(`${__dirname}/../man/help.txt`, {encoding: 'utf8'}));
13 |   }
14 | 
15 |   if (args.verbose) {
16 |     console.log(JSON.stringify(args, null, 2));
17 |   }
18 | 
19 |   if (typeof args.input === 'string') {
20 |     fs.readFile(`${args.input}.mid`, {encoding: null}, (error, data) => {
21 |       if (error) {
22 |         throw error;
23 |       }
24 | 
25 |       if (args.verbose) {
26 |         console.log('parsing MIDI...');
27 |       }
28 | 
29 |       const wav = midiToWav(data, args);
30 | 
31 |       if (args.DryRun) {
32 |         return console.log('dry run complete');
33 |       }
34 | 
35 |       if (args.verbose) {
36 |         console.log('writing buffer...');
37 |       }
38 | 
39 |       const buffer = wav.toBuffer();
40 | 
41 |       fs.writeFile(`${args.output}.wav`, buffer, {encoding: null}, (error) => {
42 |         if (error) {
43 |           throw error;
44 |         }
45 | 
46 |         if (args.verbose) {
47 |           console.log('success');
48 |         }
49 |       });
50 |     });
51 |   } else {
52 |     throw new ReferenceError('no input file specified');
53 |   }
54 | } catch (error) {
55 |   console.log(error.stack);
56 | }
57 | 


--------------------------------------------------------------------------------
/bin/utils/args.js:
--------------------------------------------------------------------------------
 1 | 'use strict';
 2 | 
 3 | function argumentToVerboseFlag(argument) {
 4 |   const camelCase = /^[\w]|\B[A-Z]/g;
 5 | 
 6 |   return argument.replace(camelCase, (character, index) => `-${'-'.charAt(index)}${character.toLowerCase()}`);
 7 | }
 8 | 
 9 | function argumentToConciseFlag(argument) {
10 |   const beginning = /^(.).*$/;
11 | 
12 |   return argument.replace(beginning, (match, character) => `-${character}`);
13 | }
14 | 
15 | // utility function to convert
16 | // command-line arguments to object
17 | module.exports = function getArguments(argv) {
18 |   const argumentNames = [
19 |     'input',
20 |     'output',
21 |     'sampleRate',
22 |     'bitsPerSample',
23 |     'duration',
24 |     'Skip',
25 |     'verbose',
26 |     'DryRun',
27 |     'help'
28 |   ];
29 | 
30 |   const defaultArgs = require('../defaults.json');
31 | 
32 |   const flagToArgument = {};
33 | 
34 |   argumentNames.forEach((argumentName) => {
35 |     flagToArgument[argumentToVerboseFlag(argumentName)] = argumentName;
36 |     flagToArgument[argumentToConciseFlag(argumentName)] = argumentName;
37 |   });
38 | 
39 |   const args = {};
40 | 
41 |   for (let i = 2; i < argv.length; i++) {
42 |     let flag = argv[i];
43 |     let arg = flagToArgument[flag];
44 | 
45 |     switch (arg) {
46 |     case 'input':
47 |     case 'output':
48 |       args[arg] = argv[++i];
49 |       break;
50 |     case 'verbose':
51 |     case 'DryRun':
52 |     case 'help':
53 |       args[arg] = true;
54 |       break;
55 |     case 'Skip':
56 |       try {
57 |         args[arg] = JSON.parse(argv[++i]);
58 |       } catch (error) {
59 |         try {
60 |           args[arg] = require(process.cwd() + '/' + argv[i]);
61 |         } catch (error) {
62 |           throw new SyntaxError(`unable to parse argument for ${flag}: ${argv[i]}`);
63 |         }
64 |       }
65 | 
66 |       break;
67 |     case 'sampleRate':
68 |     case 'bitsPerSample':
69 |     case 'duration':
70 |       args[arg] = +argv[++i];
71 | 
72 |       if (isNaN(args[arg])) {
73 |         try {
74 |           args[arg] = require(process.cwd() + '/' + argv[i]);
75 |         } catch (error) {
76 |           throw new TypeError(`invalid argument for ${flag}: ${argv[i]}`);
77 |         }
78 |       }
79 | 
80 |       break;
81 |     default:
82 |       throw new ReferenceError(`unrecognized flag: ${flag}`);
83 |     }
84 |   }
85 | 
86 |   // default to default arguments
87 |   // default output is same as input, verbose is same as DryRun
88 |   // specified arguments will override defaults
89 |   return Object.assign({}, defaultArgs, {output: args.input, verbose: args.DryRun}, args);
90 | };
91 | 


--------------------------------------------------------------------------------
/dst/synth.min.js:
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o,a,s=8*i-n-1,u=(1<<s)-1,f=u>>1,h=-7,l=r?i-1:0,c=r?-1:1,p=t[e+l];for(l+=c,o=p&(1<<-h)-1,p>>=-h,h+=s;h>0;o=256*o+t[e+l],l+=c,h-=8);for(a=o&(1<<-h)-1,o>>=-h,h+=n;h>0;a=256*a+t[e+l],l+=c,h-=8);if(0===o)o=1-f;else{if(o===u)return a?NaN:1/0*(p?-1:1);a+=Math.pow(2,n),o-=f}return(p?-1:1)*a*Math.pow(2,o-n)},r.write=function(t,e,r,n,i,o){var a,s,u,f=8*o-i-1,h=(1<<f)-1,l=h>>1,c=23===i?Math.pow(2,-24)-Math.pow(2,-77):0,p=n?0:o-1,y=n?1:-1,d=e<0||0===e&&1/e<0?1:0;for(e=Math.abs(e),isNaN(e)||e===1/0?(s=isNaN(e)?1:0,a=h):(a=Math.floor(Math.log(e)/Math.LN2),e*(u=Math.pow(2,-a))<1&&(a--,u*=2),e+=a+l>=1?c/u:c*Math.pow(2,1-l),e*u>=2&&(a++,u/=2),a+l>=h?(s=0,a=h):a+l>=1?(s=(e*u-1)*Math.pow(2,i),a+=l):(s=e*Math.pow(2,l-1)*Math.pow(2,i),a=0));i>=8;t[r+p]=255&s,p+=y,s/=256,i-=8);for(a=a<<i|s,f+=i;f>0;t[r+p]=255&a,p+=y,a/=256,f-=8);t[r+p-y]|=128*d}},{}],5:[function(t,e,r){"use strict";function n(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")}var i=function(){function t(t,e){for(var r=0;r<e.length;r++){var n=e[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(t,n.key,n)}}return function(e,r,n){return r&&t(e.prototype,r),n&&t(e,n),e}}(),o=function(){function t(e){n(this,t),this.data=new Uint8Array(e),this.byteOffset=0,this.lastEventTypeByte=0}return i(t,[{key:"readString",value:function(t){for(var e=this.byteOffset,r=0,n="";r<t;r++)n+=String.fromCharCode(this.data[e+r]);return this.byteOffset+=t,n}},{key:"readUint32",value:function(){var t=this.byteOffset,e=this.data[t]<<24|this.data[t+1]<<16|this.data[t+2]<<8|this.data[t+3];return this.byteOffset+=4,e}},{key:"readUint24",value:function(){var t=this.byteOffset,e=this.data[t]<<16|this.data[t+1]<<8|this.data[t+2];return this.byteOffset+=3,e}},{key:"readUint16",value:function(){var t=this.byteOffset,e=this.data[t]<<8|this.data[t+1];return this.byteOffset+=2,e}},{key:"readUint8",value:function(){var t=this.byteOffset,e=this.data[t];return this.byteOffset+=1,e}},{key:"readInt8",value:function(){var t=this.byteOffset,e=this.data[t];return!0&e&&(e^=4294967040),this.byteOffset+=1,e}},{key:"readVarUint",value:function(){var t,e=0;do{t=this.readUint8(),e=(e<<7)+(127&t)}while(128==(128&t));return e}},{key:"skip",value:function(t){this.byteOffset+=t}},{key:"readChunk",value:function(){var t=this.readString(4),e=this.readUint32(),r=this.byteOffset;return this.byteOffset+=e,{id:t,length:e,data:this.data.slice(r,this.byteOffset).buffer}}},{key:"readEvent",value:function(){var t={};t.delta=this.readVarUint();var e=this.readUint8();if(240==(240&e))switch(e){case 255:t.type="meta";var r=this.readUint8(),n=this.readVarUint();switch(r){case 0:t.subType="sequenceNumber",2===n?t.value=this.readUint16():this.skip(n);break;case 1:t.subType="text",t.value=this.readString(n);break;case 2:t.subType="copyrightNotice",t.value=this.readString(n);break;case 3:t.subType="trackName",t.value=this.readString(n);break;case 4:t.subType="instrumentName",t.value=this.readString(n);break;case 5:t.subType="lyrics",t.value=this.readString(n);break;case 6:t.subType="marker",t.value=this.readString(n);break;case 7:t.subType="cuePoint",t.value=this.readString(n);break;case 32:t.subType="midiChannelPrefix",1===n?t.value=this.readUint8():this.skip(n);break;case 47:t.subType="endOfTrack",n>0&&this.skip(n);break;case 81:t.subType="setTempo",3===n?t.value=this.readUint24():this.skip(n);break;case 84:if(t.subType="smpteOffset",5===n){var i=this.readUint8();t.value={frameRate:{0:24,1:25,2:29.97,3:30}[i>>>6],hour:63&i,minute:this.readUint8(),second:this.readUint8(),frame:this.readUint8(),subFrame:this.readUint8()}}else this.skip(n);break;case 88:t.subType="timeSignature",4===n?t.value={numerator:this.readUint8(),denominator:1<<this.readUint8(),metronome:this.readUint8(),thirtyseconds:this.readUint8()}:this.skip(n);break;case 89:t.subType="keySignature",2===n?t.value={key:this.readInt8(),scale:this.readUint8()}:this.skip(n);break;case 127:t.subType="sequencerSpecific",t.value=this.readString(n);break;default:t.subType="unknown",t.value=this.readString(n)}break;case 240:t.type="sysEx";var n=this.readVarUint();t.value=this.readString(n);break;case 247:t.type="dividedSysEx";var n=this.readVarUint();t.value=this.readString(n);break;default:t.type="unknown";var n=this.readVarUint();t.value=this.readString(n)}else{var o;0==(128&e)?(o=e,e=this.lastEventTypeByte):(o=this.readUint8(),this.lastEventTypeByte=e);var a=e>>4;switch(t.channel=15&e,t.type="channel",a){case 8:t.subType="noteOff",t.value={noteNumber:o,velocity:this.readUint8()};break;case 9:t.value={noteNumber:o,velocity:this.readUint8()},0===t.value.velocity?t.subType="noteOff":t.subType="noteOn";break;case 10:t.subType="noteAftertouch",t.value={noteNumber:o,amount:this.readUint8()};break;case 11:t.subType="controller",t.value={controllerNumber:o,controllerValue:this.readUint8()};break;case 12:t.subType="programChange",t.value=o;break;case 13:t.subType="channelAftertouch",t.value=o;break;case 14:t.subType="pitchBend",t.value=o+(this.readUint8()<<7);break;default:t.subType="unknown",t.value=(o<<8)+this.readUint8()}}return t}}]),t}();e.exports=o},{}],6:[function(t,e,r){"use strict";var n=t("./wav"),i=t("./midi"),o=t("./utils/timer");e.exports=function(t){var e=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};e.verbose&&console.log("parsing MIDI header...");var r=new i(t),a=r.readChunk();if("MThd"!==a.id||6!==a.length)throw new SyntaxError("malformed header");for(var s=new i(a.data),u=(s.readUint16(),s.readUint16()),f=s.readUint16(),h=[],l=[],c=[],p=void 0,y=0;y<u;y++){e.verbose&&console.log("parsing track "+(y+1)+"...");var d=r.readChunk();if("MTrk"===d.id){for(var g=new i(d.data),v=[],b=!0;b&&g.byteOffset<d.length;){var w=g.readEvent();if(v.push(w),"string"==typeof w.value&&(e.verbose&&console.log('{"'+w.subType+'":"'+w.value+'"}'),Array.isArray(e.Skip)))for(var m=0;m<e.Skip.length;m++)if(e.Skip[m][w.subType]===w.value){e.verbose&&console.log('skip match found: {"'+w.subType+'":"'+w.value+'"}'),b=!1;break}}"function"==typeof e.Skip&&(b=!e.Skip(v)),b?h.push(v):e.verbose&&console.log("skipping track "+(y+1)+"...")}}if(f>>>15!=0)return console.log("Detected unsupported MIDI timing mode"),null;var k=new o(f);e.verbose&&console.log("initializing timer...");for(var E,S=0,U=0,A=0;S<h[0].length;S++)E=h[0][S],U+=E.delta,A+=E.delta,"setTempo"===E.subType&&(k.addCriticalPoint(U,E.value),U=0);for(var B=0;B<h.length;B++){e.verbose&&console.log("generating progression from track "+(B+1)+"...");for(var T=h[B],C=0,O=new Map,I=0;I<T.length;I++){var M=T[I];if(C+=M.delta,"channel"===M.type){var P=M.value.noteNumber;if("noteOn"===M.subType){var R=M.value.velocity,x=k.getTime(C);O.has(P)?O.get(P).push({offset:x,velocity:R}):O.set(P,[{offset:x,velocity:R}]),c.push({velocity:R,delta:C,note:!0})}else if("noteOff"===M.subType){var L=O.get(P),N=L?L.pop():{offset:0,velocity:0};l.push({note:n.note(P),time:k.getTime(C)-N.offset,amplitude:N.velocity/128,offset:N.offset}),c.push({velocity:N.velocity,delta:C,note:!1})}}else e.verbose&&"meta"===M.type&&"string"==typeof M.value&&console.log(k.getTime(C).toFixed(2)+"s "+M.subType+": "+M.value)}}e.verbose&&console.log("normalizing volume..."),c.sort(function(t,e){return t.delta-e.delta||t.note-e.note}),e.verbose&&(console.log("total notes:",l.length),console.log("total time:",k.getTime(c[c.length-1].delta),"seconds"));var D=1,j=0,z=1,F=0,_=0,V=0,q=!0,W=!1,Y=void 0;try{for(var G,X=c[Symbol.iterator]();!(q=(G=X.next()).done);q=!0){var J=G.value;J.note?(z+=J.velocity,V++,z>D&&(D=z,j=k.getTime(J.delta)),V>F&&(F=V,_=k.getTime(J.delta))):(z-=J.velocity,V--)}}catch(t){W=!0,Y=t}finally{try{!q&&X.return&&X.return()}finally{if(W)throw Y}}p=128/D,e.verbose&&(console.log("setting volume to",p),console.log("  maximum chord of",F,"at",_,"seconds"),console.log("  maximum velocity of",D-1,"at",j,"seconds")),e.channels=1,e.verbose&&console.log("generating WAV buffer...");var Z=new n(e.channels,e.sampleRate,e.bitsPerSample);return Z.writeProgression(l,p,[0],!0,!0,e.duration),Z}},{"./midi":5,"./utils/timer":7,"./wav":8}],7:[function(t,e,r){"use strict";function n(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")}var i=function(){function t(t,e){for(var r=0;r<e.length;r++){var n=e[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(t,n.key,n)}}return function(e,r,n){return r&&t(e.prototype,r),n&&t(e,n),e}}(),o=function(){function t(e){n(this,t),this.ticksPerBeat=e,this.criticalPoints=[]}return i(t,[{key:"addCriticalPoint",value:function(t,e){this.criticalPoints.push({delta:t,microsecondsPerBeat:e})}},{key:"getTime",value:function(t){for(var e,r=0,n=5e5,i=0;i<this.criticalPoints.length&&t>0;i++)e=this.criticalPoints[i],t>=e.delta?(r+=e.delta*n/this.ticksPerBeat/1e6,t-=e.delta):(r+=t*n/this.ticksPerBeat/1e6,t=0),
2 | n=e.microsecondsPerBeat;return r+=t*n/this.ticksPerBeat/1e6}}]),t}();e.exports=o},{}],8:[function(t,e,r){(function(t){"use strict";function r(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")}var n=function(){function t(t,e){var r=[],n=!0,i=!1,o=void 0;try{for(var a,s=t[Symbol.iterator]();!(n=(a=s.next()).done)&&(r.push(a.value),!e||r.length!==e);n=!0);}catch(t){i=!0,o=t}finally{try{!n&&s.return&&s.return()}finally{if(i)throw o}}return r}return function(e,r){if(Array.isArray(e))return e;if(Symbol.iterator in Object(e))return t(e,r);throw new TypeError("Invalid attempt to destructure non-iterable instance")}}(),i=function(){function t(t,e){for(var r=0;r<e.length;r++){var n=e[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(t,n.key,n)}}return function(e,r,n){return r&&t(e.prototype,r),n&&t(e,n),e}}(),o=function(){function e(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:1,n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:44100,i=arguments.length>2&&void 0!==arguments[2]?arguments[2]:16,o=!(arguments.length>3&&void 0!==arguments[3])||arguments[3],a=arguments.length>4&&void 0!==arguments[4]?arguments[4]:[];r(this,e);var s=i>>>3;this.header=new ArrayBuffer(44),this.view=new DataView(this.header),this.data=a,Object.defineProperty(this,"littleEndian",{configurable:!1,enumerable:!0,value:o,writable:!1}),this.pointer=0,this.ChunkID=o?"RIFF":"RIFX",this.ChunkSize=this.header.byteLength-8,this.Format="WAVE",this.SubChunk1ID="fmt ",this.SubChunk1Size=16,this.AudioFormat=1,this.NumChannels=t,this.SampleRate=n,this.ByteRate=t*n*s,this.BlockAlign=t*s,this.BitsPerSample=i,this.SubChunk2ID="data",this.SubChunk2Size=a.length*s}return i(e,null,[{key:"semitone",value:function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:"REST",e=/^([A-G])(\-?\d+)(b{0,2}|#{0,2})$/;if(!e.test(t))return-1/0;var r=t.match(e),i=n(r,4),o=i[1],a=i[2],s=i[3],u={C:0,D:2,E:4,F:5,G:7,A:9,B:11},f={"-1":0,0:1,1:2,2:3,3:4,4:5,5:6,6:7,7:8,8:9,9:10,10:11},h={bb:-2,b:-1,"":0,"#":1,"##":2};return void 0===u[o]||void 0===f[a]||void 0===h[s]?-1/0:u[o]+12*f[a]+h[s]}},{key:"note",value:function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:-1/0,e=[-1,0,1,2,3,4,5,6,7,8,9,10],r=["C","C#","D","D#","E","F","F#","G","G#","A","A#","B"],n=Math.floor(t/12),i=Math.floor(t-12*n),o=e[n],a=r[i];return void 0===o||void 0===a?"REST":a.charAt(0)+o.toString()+a.charAt(1)}},{key:"frequency",value:function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:-1/0;return 440*Math.pow(2,(t-69)/12)}}]),i(e,[{key:"setString",value:function(t){for(var e=arguments.length>1&&void 0!==arguments[1]?arguments[1]:t.length,r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:0,n=0;n<e;n++)this.view.setUint8(r+n,t.charCodeAt(n))}},{key:"getString",value:function(t){for(var e=arguments.length>1&&void 0!==arguments[1]?arguments[1]:0,r=0,n="";r<t;r++)n+=String.fromCharCode(this.view.getUint8(e+r));return n}},{key:"toBlob",value:function(){return new Blob([this.header,this.typedData],{type:"audio/wav"})}},{key:"toBuffer",value:function(){return t.concat([t.from(this.header),t.from(this.typedData)])}},{key:"tell",value:function(){return this.pointer/this.NumChannels/this.SampleRate}},{key:"seek",value:function(t){var e=!(arguments.length>1&&void 0!==arguments[1])||arguments[1],r=this.data,n=Math.round(this.SampleRate*t);if(this.pointer=this.NumChannels*n,e)for(;r.length<this.pointer;)r[r.length]=0;else this.pointer=r.length}},{key:"writeNote",value:function(t){var r,n,i,o,a=t.note,s=t.time,u=t.amplitude,f=void 0===u?1:u,h=arguments.length>1&&void 0!==arguments[1]?arguments[1]:[],l=!(arguments.length>2&&void 0!==arguments[2])||arguments[2],c=arguments.length>3&&void 0!==arguments[3]&&arguments[3],p=this.data,y=this.NumChannels,d=this.SampleRate,g=e.semitone(a),v=e.frequency(g)*Math.PI*2/d,b=(Math.PI,Math.round(d*s)),w=b-.001*d,m=b-w+1,k=this.pointer,E=p.length,S=Math.min(Math.floor((E-k)/y),b);if(0===h.length)for(h=[],r=0;r<y;r++)h[r]=r;var U=[];for(r=0;r<y;r++)U[r]=-1===h.indexOf(r);for(r=0;r<S;r++)for(n=0;n<h.length;n++)i=k+r*y+h[n],o=0,v>0&&(o=f*Math.sin(v*r)*(r<m?r:r>w?b-r+1:m)/m),p[i]=o+(l?p[i]:0);for(r=S;r<b;r++)for(i=k+r*y,n=0;n<y;n++)o=0,(v>0||!U[n])&&(o=f*Math.sin(v*r)*(r<m?r:r>w?b-r+1:m)/m),p[i+n]=o;var A=Math.max(k+b*y,E)*this.BitsPerSample>>>3;this.ChunkSize=A+this.header.byteLength-8,this.SubChunk2Size=A,c||(this.pointer=k+b*y)}},{key:"writeProgression",value:function(t){for(var e,r,n,i,o,a,s=arguments.length>1&&void 0!==arguments[1]?arguments[1]:1,u=arguments.length>2&&void 0!==arguments[2]?arguments[2]:[],f=!(arguments.length>3&&void 0!==arguments[3])||arguments[3],h=arguments.length>4&&void 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3 | //# sourceMappingURL=synth.min.js.map
4 | 


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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})()","'use strict';\r\n\r\nmodule.exports = {\r\n  WAV: require('./src/wav'),\r\n  MIDIStream: require('./src/midi'),\r\n  midiToWav: require('./src/midi2wav')\r\n};\r\n","'use strict'\n\nexports.byteLength = byteLength\nexports.toByteArray = toByteArray\nexports.fromByteArray = fromByteArray\n\nvar lookup = []\nvar revLookup = []\nvar Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array\n\nvar code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'\nfor (var i = 0, len = code.length; i < len; ++i) {\n  lookup[i] = code[i]\n  revLookup[code.charCodeAt(i)] = i\n}\n\n// Support decoding URL-safe base64 strings, as Node.js does.\n// See: https://en.wikipedia.org/wiki/Base64#URL_applications\nrevLookup['-'.charCodeAt(0)] = 62\nrevLookup['_'.charCodeAt(0)] = 63\n\nfunction getLens (b64) {\n  var len = b64.length\n\n  if (len % 4 > 0) {\n    throw new Error('Invalid string. Length must be a multiple of 4')\n  }\n\n  // Trim off extra bytes after placeholder bytes are found\n  // See: https://github.com/beatgammit/base64-js/issues/42\n  var validLen = b64.indexOf('=')\n  if (validLen === -1) validLen = len\n\n  var placeHoldersLen = validLen === len\n    ? 0\n    : 4 - (validLen % 4)\n\n  return [validLen, placeHoldersLen]\n}\n\n// base64 is 4/3 + up to two characters of the original data\nfunction byteLength (b64) {\n  var lens = getLens(b64)\n  var validLen = lens[0]\n  var placeHoldersLen = lens[1]\n  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen\n}\n\nfunction _byteLength (b64, validLen, placeHoldersLen) {\n  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen\n}\n\nfunction toByteArray (b64) {\n  var tmp\n  var lens = getLens(b64)\n  var validLen = lens[0]\n  var placeHoldersLen = lens[1]\n\n  var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))\n\n  var curByte = 0\n\n  // if there are placeholders, only get up to the last complete 4 chars\n  var len = placeHoldersLen > 0\n    ? validLen - 4\n    : validLen\n\n  var i\n  for (i = 0; i < len; i += 4) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 18) |\n      (revLookup[b64.charCodeAt(i + 1)] << 12) |\n      (revLookup[b64.charCodeAt(i + 2)] << 6) |\n      revLookup[b64.charCodeAt(i + 3)]\n    arr[curByte++] = (tmp >> 16) & 0xFF\n    arr[curByte++] = (tmp >> 8) & 0xFF\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  if (placeHoldersLen === 2) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 2) |\n      (revLookup[b64.charCodeAt(i + 1)] >> 4)\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  if (placeHoldersLen === 1) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 10) |\n      (revLookup[b64.charCodeAt(i + 1)] << 4) |\n      (revLookup[b64.charCodeAt(i + 2)] >> 2)\n    arr[curByte++] = (tmp >> 8) & 0xFF\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  return arr\n}\n\nfunction tripletToBase64 (num) {\n  return lookup[num >> 18 & 0x3F] +\n    lookup[num >> 12 & 0x3F] +\n    lookup[num >> 6 & 0x3F] +\n    lookup[num & 0x3F]\n}\n\nfunction encodeChunk (uint8, start, end) {\n  var tmp\n  var output = []\n  for (var i = start; i < end; i += 3) {\n    tmp =\n      ((uint8[i] << 16) & 0xFF0000) +\n      ((uint8[i + 1] << 8) & 0xFF00) +\n      (uint8[i + 2] & 0xFF)\n    output.push(tripletToBase64(tmp))\n  }\n  return output.join('')\n}\n\nfunction fromByteArray (uint8) {\n  var tmp\n  var len = uint8.length\n  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes\n  var parts = []\n  var maxChunkLength = 16383 // must be multiple of 3\n\n  // go through the array every three bytes, we'll deal with trailing stuff later\n  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {\n    parts.push(encodeChunk(\n      uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)\n    ))\n  }\n\n  // pad the end with zeros, but make sure to not forget the extra bytes\n  if (extraBytes === 1) {\n    tmp = uint8[len - 1]\n    parts.push(\n      lookup[tmp >> 2] +\n      lookup[(tmp << 4) & 0x3F] +\n      '=='\n    )\n  } else if (extraBytes === 2) {\n    tmp = (uint8[len - 2] << 8) + uint8[len - 1]\n    parts.push(\n      lookup[tmp >> 10] +\n      lookup[(tmp >> 4) & 0x3F] +\n      lookup[(tmp << 2) & 0x3F] +\n      '='\n    )\n  }\n\n  return parts.join('')\n}\n","/*!\n * The buffer module from node.js, for the browser.\n *\n * @author   Feross Aboukhadijeh <https://feross.org>\n * @license  MIT\n */\n/* eslint-disable no-proto */\n\n'use strict'\n\nvar base64 = require('base64-js')\nvar ieee754 = require('ieee754')\nvar customInspectSymbol =\n  (typeof Symbol === 'function' && typeof Symbol.for === 'function')\n    ? Symbol.for('nodejs.util.inspect.custom')\n    : null\n\nexports.Buffer = Buffer\nexports.SlowBuffer = SlowBuffer\nexports.INSPECT_MAX_BYTES = 50\n\nvar K_MAX_LENGTH = 0x7fffffff\nexports.kMaxLength = K_MAX_LENGTH\n\n/**\n * If `Buffer.TYPED_ARRAY_SUPPORT`:\n *   === true    Use Uint8Array implementation (fastest)\n *   === false   Print warning and recommend using `buffer` v4.x which has an Object\n *               implementation (most compatible, even IE6)\n *\n * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,\n * Opera 11.6+, iOS 4.2+.\n *\n * We report that the browser does not support typed arrays if the are not subclassable\n * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`\n * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support\n * for __proto__ and has a buggy typed array implementation.\n */\nBuffer.TYPED_ARRAY_SUPPORT = typedArraySupport()\n\nif (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&\n    typeof console.error === 'function') {\n  console.error(\n    'This browser lacks typed array (Uint8Array) support which is required by ' +\n    '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'\n  )\n}\n\nfunction typedArraySupport () {\n  // Can typed array instances can be augmented?\n  try {\n    var arr = new Uint8Array(1)\n    var proto = { foo: function () { return 42 } }\n    Object.setPrototypeOf(proto, Uint8Array.prototype)\n    Object.setPrototypeOf(arr, proto)\n    return arr.foo() === 42\n  } catch (e) {\n    return false\n  }\n}\n\nObject.defineProperty(Buffer.prototype, 'parent', {\n  enumerable: true,\n  get: function () {\n    if (!Buffer.isBuffer(this)) return undefined\n    return this.buffer\n  }\n})\n\nObject.defineProperty(Buffer.prototype, 'offset', {\n  enumerable: true,\n  get: function () {\n    if (!Buffer.isBuffer(this)) return undefined\n    return this.byteOffset\n  }\n})\n\nfunction createBuffer (length) {\n  if (length > K_MAX_LENGTH) {\n    throw new RangeError('The value \"' + length + '\" is invalid for option \"size\"')\n  }\n  // Return an augmented `Uint8Array` instance\n  var buf = new Uint8Array(length)\n  Object.setPrototypeOf(buf, Buffer.prototype)\n  return buf\n}\n\n/**\n * The Buffer constructor returns instances of `Uint8Array` that have their\n * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of\n * `Uint8Array`, so the returned instances will have all the node `Buffer` methods\n * and the `Uint8Array` methods. Square bracket notation works as expected -- it\n * returns a single octet.\n *\n * The `Uint8Array` prototype remains unmodified.\n */\n\nfunction Buffer (arg, encodingOrOffset, length) {\n  // Common case.\n  if (typeof arg === 'number') {\n    if (typeof encodingOrOffset === 'string') {\n      throw new TypeError(\n        'The \"string\" argument must be of type string. Received type number'\n      )\n    }\n    return allocUnsafe(arg)\n  }\n  return from(arg, encodingOrOffset, length)\n}\n\nBuffer.poolSize = 8192 // not used by this implementation\n\nfunction from (value, encodingOrOffset, length) {\n  if (typeof value === 'string') {\n    return fromString(value, encodingOrOffset)\n  }\n\n  if (ArrayBuffer.isView(value)) {\n    return fromArrayLike(value)\n  }\n\n  if (value == null) {\n    throw new TypeError(\n      'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +\n      'or Array-like Object. Received type ' + (typeof value)\n    )\n  }\n\n  if (isInstance(value, ArrayBuffer) ||\n      (value && isInstance(value.buffer, ArrayBuffer))) {\n    return fromArrayBuffer(value, encodingOrOffset, length)\n  }\n\n  if (typeof SharedArrayBuffer !== 'undefined' &&\n      (isInstance(value, SharedArrayBuffer) ||\n      (value && isInstance(value.buffer, SharedArrayBuffer)))) {\n    return fromArrayBuffer(value, encodingOrOffset, length)\n  }\n\n  if (typeof value === 'number') {\n    throw new TypeError(\n      'The \"value\" argument must not be of type number. Received type number'\n    )\n  }\n\n  var valueOf = value.valueOf && value.valueOf()\n  if (valueOf != null && valueOf !== value) {\n    return Buffer.from(valueOf, encodingOrOffset, length)\n  }\n\n  var b = fromObject(value)\n  if (b) return b\n\n  if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&\n      typeof value[Symbol.toPrimitive] === 'function') {\n    return Buffer.from(\n      value[Symbol.toPrimitive]('string'), encodingOrOffset, length\n    )\n  }\n\n  throw new TypeError(\n    'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +\n    'or Array-like Object. Received type ' + (typeof value)\n  )\n}\n\n/**\n * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError\n * if value is a number.\n * Buffer.from(str[, encoding])\n * Buffer.from(array)\n * Buffer.from(buffer)\n * Buffer.from(arrayBuffer[, byteOffset[, length]])\n **/\nBuffer.from = function (value, encodingOrOffset, length) {\n  return from(value, encodingOrOffset, length)\n}\n\n// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:\n// https://github.com/feross/buffer/pull/148\nObject.setPrototypeOf(Buffer.prototype, Uint8Array.prototype)\nObject.setPrototypeOf(Buffer, Uint8Array)\n\nfunction assertSize (size) {\n  if (typeof size !== 'number') {\n    throw new TypeError('\"size\" argument must be of type number')\n  } else if (size < 0) {\n    throw new RangeError('The value \"' + size + '\" is invalid for option \"size\"')\n  }\n}\n\nfunction alloc (size, fill, encoding) {\n  assertSize(size)\n  if (size <= 0) {\n    return createBuffer(size)\n  }\n  if (fill !== undefined) {\n    // Only pay attention to encoding if it's a string. This\n    // prevents accidentally sending in a number that would\n    // be interpretted as a start offset.\n    return typeof encoding === 'string'\n      ? createBuffer(size).fill(fill, encoding)\n      : createBuffer(size).fill(fill)\n  }\n  return createBuffer(size)\n}\n\n/**\n * Creates a new filled Buffer instance.\n * alloc(size[, fill[, encoding]])\n **/\nBuffer.alloc = function (size, fill, encoding) {\n  return alloc(size, fill, encoding)\n}\n\nfunction allocUnsafe (size) {\n  assertSize(size)\n  return createBuffer(size < 0 ? 0 : checked(size) | 0)\n}\n\n/**\n * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.\n * */\nBuffer.allocUnsafe = function (size) {\n  return allocUnsafe(size)\n}\n/**\n * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.\n */\nBuffer.allocUnsafeSlow = function (size) {\n  return allocUnsafe(size)\n}\n\nfunction fromString (string, encoding) {\n  if (typeof encoding !== 'string' || encoding === '') {\n    encoding = 'utf8'\n  }\n\n  if (!Buffer.isEncoding(encoding)) {\n    throw new TypeError('Unknown encoding: ' + encoding)\n  }\n\n  var length = byteLength(string, encoding) | 0\n  var buf = createBuffer(length)\n\n  var actual = buf.write(string, encoding)\n\n  if (actual !== length) {\n    // Writing a hex string, for example, that contains invalid characters will\n    // cause everything after the first invalid character to be ignored. (e.g.\n    // 'abxxcd' will be treated as 'ab')\n    buf = buf.slice(0, actual)\n  }\n\n  return buf\n}\n\nfunction fromArrayLike (array) {\n  var length = array.length < 0 ? 0 : checked(array.length) | 0\n  var buf = createBuffer(length)\n  for (var i = 0; i < length; i += 1) {\n    buf[i] = array[i] & 255\n  }\n  return buf\n}\n\nfunction fromArrayBuffer (array, byteOffset, length) {\n  if (byteOffset < 0 || array.byteLength < byteOffset) {\n    throw new RangeError('\"offset\" is outside of buffer bounds')\n  }\n\n  if (array.byteLength < byteOffset + (length || 0)) {\n    throw new RangeError('\"length\" is outside of buffer bounds')\n  }\n\n  var buf\n  if (byteOffset === undefined && length === undefined) {\n    buf = new Uint8Array(array)\n  } else if (length === undefined) {\n    buf = new Uint8Array(array, byteOffset)\n  } else {\n    buf = new Uint8Array(array, byteOffset, length)\n  }\n\n  // Return an augmented `Uint8Array` instance\n  Object.setPrototypeOf(buf, Buffer.prototype)\n\n  return buf\n}\n\nfunction fromObject (obj) {\n  if (Buffer.isBuffer(obj)) {\n    var len = checked(obj.length) | 0\n    var buf = createBuffer(len)\n\n    if (buf.length === 0) {\n      return buf\n    }\n\n    obj.copy(buf, 0, 0, len)\n    return buf\n  }\n\n  if (obj.length !== undefined) {\n    if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {\n      return createBuffer(0)\n    }\n    return fromArrayLike(obj)\n  }\n\n  if (obj.type === 'Buffer' && Array.isArray(obj.data)) {\n    return fromArrayLike(obj.data)\n  }\n}\n\nfunction checked (length) {\n  // Note: cannot use `length < K_MAX_LENGTH` here because that fails when\n  // length is NaN (which is otherwise coerced to zero.)\n  if (length >= K_MAX_LENGTH) {\n    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +\n                         'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')\n  }\n  return length | 0\n}\n\nfunction SlowBuffer (length) {\n  if (+length != length) { // eslint-disable-line eqeqeq\n    length = 0\n  }\n  return Buffer.alloc(+length)\n}\n\nBuffer.isBuffer = function isBuffer (b) {\n  return b != null && b._isBuffer === true &&\n    b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false\n}\n\nBuffer.compare = function compare (a, b) {\n  if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)\n  if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)\n  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {\n    throw new TypeError(\n      'The \"buf1\", \"buf2\" arguments must be one of type Buffer or Uint8Array'\n    )\n  }\n\n  if (a === b) return 0\n\n  var x = a.length\n  var y = b.length\n\n  for (var i = 0, len = Math.min(x, y); i < len; ++i) {\n    if (a[i] !== b[i]) {\n      x = a[i]\n      y = b[i]\n      break\n    }\n  }\n\n  if (x < y) return -1\n  if (y < x) return 1\n  return 0\n}\n\nBuffer.isEncoding = function isEncoding (encoding) {\n  switch (String(encoding).toLowerCase()) {\n    case 'hex':\n    case 'utf8':\n    case 'utf-8':\n    case 'ascii':\n    case 'latin1':\n    case 'binary':\n    case 'base64':\n    case 'ucs2':\n    case 'ucs-2':\n    case 'utf16le':\n    case 'utf-16le':\n      return true\n    default:\n      return false\n  }\n}\n\nBuffer.concat = function concat (list, length) {\n  if (!Array.isArray(list)) {\n    throw new TypeError('\"list\" argument must be an Array of Buffers')\n  }\n\n  if (list.length === 0) {\n    return Buffer.alloc(0)\n  }\n\n  var i\n  if (length === undefined) {\n    length = 0\n    for (i = 0; i < list.length; ++i) {\n      length += list[i].length\n    }\n  }\n\n  var buffer = Buffer.allocUnsafe(length)\n  var pos = 0\n  for (i = 0; i < list.length; ++i) {\n    var buf = list[i]\n    if (isInstance(buf, Uint8Array)) {\n      buf = Buffer.from(buf)\n    }\n    if (!Buffer.isBuffer(buf)) {\n      throw new TypeError('\"list\" argument must be an Array of Buffers')\n    }\n    buf.copy(buffer, pos)\n    pos += buf.length\n  }\n  return buffer\n}\n\nfunction byteLength (string, encoding) {\n  if (Buffer.isBuffer(string)) {\n    return string.length\n  }\n  if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {\n    return string.byteLength\n  }\n  if (typeof string !== 'string') {\n    throw new TypeError(\n      'The \"string\" argument must be one of type string, Buffer, or ArrayBuffer. ' +\n      'Received type ' + typeof string\n    )\n  }\n\n  var len = string.length\n  var mustMatch = (arguments.length > 2 && arguments[2] === true)\n  if (!mustMatch && len === 0) return 0\n\n  // Use a for loop to avoid recursion\n  var loweredCase = false\n  for (;;) {\n    switch (encoding) {\n      case 'ascii':\n      case 'latin1':\n      case 'binary':\n        return len\n      case 'utf8':\n      case 'utf-8':\n        return utf8ToBytes(string).length\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return len * 2\n      case 'hex':\n        return len >>> 1\n      case 'base64':\n        return base64ToBytes(string).length\n      default:\n        if (loweredCase) {\n          return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8\n        }\n        encoding = ('' + encoding).toLowerCase()\n        loweredCase = true\n    }\n  }\n}\nBuffer.byteLength = byteLength\n\nfunction slowToString (encoding, start, end) {\n  var loweredCase = false\n\n  // No need to verify that \"this.length <= MAX_UINT32\" since it's a read-only\n  // property of a typed array.\n\n  // This behaves neither like String nor Uint8Array in that we set start/end\n  // to their upper/lower bounds if the value passed is out of range.\n  // undefined is handled specially as per ECMA-262 6th Edition,\n  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.\n  if (start === undefined || start < 0) {\n    start = 0\n  }\n  // Return early if start > this.length. Done here to prevent potential uint32\n  // coercion fail below.\n  if (start > this.length) {\n    return ''\n  }\n\n  if (end === undefined || end > this.length) {\n    end = this.length\n  }\n\n  if (end <= 0) {\n    return ''\n  }\n\n  // Force coersion to uint32. This will also coerce falsey/NaN values to 0.\n  end >>>= 0\n  start >>>= 0\n\n  if (end <= start) {\n    return ''\n  }\n\n  if (!encoding) encoding = 'utf8'\n\n  while (true) {\n    switch (encoding) {\n      case 'hex':\n        return hexSlice(this, start, end)\n\n      case 'utf8':\n      case 'utf-8':\n        return utf8Slice(this, start, end)\n\n      case 'ascii':\n        return asciiSlice(this, start, end)\n\n      case 'latin1':\n      case 'binary':\n        return latin1Slice(this, start, end)\n\n      case 'base64':\n        return base64Slice(this, start, end)\n\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return utf16leSlice(this, start, end)\n\n      default:\n        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)\n        encoding = (encoding + '').toLowerCase()\n        loweredCase = true\n    }\n  }\n}\n\n// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)\n// to detect a Buffer instance. It's not possible to use `instanceof Buffer`\n// reliably in a browserify context because there could be multiple different\n// copies of the 'buffer' package in use. This method works even for Buffer\n// instances that were created from another copy of the `buffer` package.\n// See: https://github.com/feross/buffer/issues/154\nBuffer.prototype._isBuffer = true\n\nfunction swap (b, n, m) {\n  var i = b[n]\n  b[n] = b[m]\n  b[m] = i\n}\n\nBuffer.prototype.swap16 = function swap16 () {\n  var len = this.length\n  if (len % 2 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 16-bits')\n  }\n  for (var i = 0; i < len; i += 2) {\n    swap(this, i, i + 1)\n  }\n  return this\n}\n\nBuffer.prototype.swap32 = function swap32 () {\n  var len = this.length\n  if (len % 4 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 32-bits')\n  }\n  for (var i = 0; i < len; i += 4) {\n    swap(this, i, i + 3)\n    swap(this, i + 1, i + 2)\n  }\n  return this\n}\n\nBuffer.prototype.swap64 = function swap64 () {\n  var len = this.length\n  if (len % 8 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 64-bits')\n  }\n  for (var i = 0; i < len; i += 8) {\n    swap(this, i, i + 7)\n    swap(this, i + 1, i + 6)\n    swap(this, i + 2, i + 5)\n    swap(this, i + 3, i + 4)\n  }\n  return this\n}\n\nBuffer.prototype.toString = function toString () {\n  var length = this.length\n  if (length === 0) return ''\n  if (arguments.length === 0) return utf8Slice(this, 0, length)\n  return slowToString.apply(this, arguments)\n}\n\nBuffer.prototype.toLocaleString = Buffer.prototype.toString\n\nBuffer.prototype.equals = function equals (b) {\n  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')\n  if (this === b) return true\n  return Buffer.compare(this, b) === 0\n}\n\nBuffer.prototype.inspect = function inspect () {\n  var str = ''\n  var max = exports.INSPECT_MAX_BYTES\n  str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()\n  if (this.length > max) str += ' ... '\n  return '<Buffer ' + str + '>'\n}\nif (customInspectSymbol) {\n  Buffer.prototype[customInspectSymbol] = Buffer.prototype.inspect\n}\n\nBuffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {\n  if (isInstance(target, Uint8Array)) {\n    target = Buffer.from(target, target.offset, target.byteLength)\n  }\n  if (!Buffer.isBuffer(target)) {\n    throw new TypeError(\n      'The \"target\" argument must be one of type Buffer or Uint8Array. ' +\n      'Received type ' + (typeof target)\n    )\n  }\n\n  if (start === undefined) {\n    start = 0\n  }\n  if (end === undefined) {\n    end = target ? target.length : 0\n  }\n  if (thisStart === undefined) {\n    thisStart = 0\n  }\n  if (thisEnd === undefined) {\n    thisEnd = this.length\n  }\n\n  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {\n    throw new RangeError('out of range index')\n  }\n\n  if (thisStart >= thisEnd && start >= end) {\n    return 0\n  }\n  if (thisStart >= thisEnd) {\n    return -1\n  }\n  if (start >= end) {\n    return 1\n  }\n\n  start >>>= 0\n  end >>>= 0\n  thisStart >>>= 0\n  thisEnd >>>= 0\n\n  if (this === target) return 0\n\n  var x = thisEnd - thisStart\n  var y = end - start\n  var len = Math.min(x, y)\n\n  var thisCopy = this.slice(thisStart, thisEnd)\n  var targetCopy = target.slice(start, end)\n\n  for (var i = 0; i < len; ++i) {\n    if (thisCopy[i] !== targetCopy[i]) {\n      x = thisCopy[i]\n      y = targetCopy[i]\n      break\n    }\n  }\n\n  if (x < y) return -1\n  if (y < x) return 1\n  return 0\n}\n\n// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,\n// OR the last index of `val` in `buffer` at offset <= `byteOffset`.\n//\n// Arguments:\n// - buffer - a Buffer to search\n// - val - a string, Buffer, or number\n// - byteOffset - an index into `buffer`; will be clamped to an int32\n// - encoding - an optional encoding, relevant is val is a string\n// - dir - true for indexOf, false for lastIndexOf\nfunction bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {\n  // Empty buffer means no match\n  if (buffer.length === 0) return -1\n\n  // Normalize byteOffset\n  if (typeof byteOffset === 'string') {\n    encoding = byteOffset\n    byteOffset = 0\n  } else if (byteOffset > 0x7fffffff) {\n    byteOffset = 0x7fffffff\n  } else if (byteOffset < -0x80000000) {\n    byteOffset = -0x80000000\n  }\n  byteOffset = +byteOffset // Coerce to Number.\n  if (numberIsNaN(byteOffset)) {\n    // byteOffset: it it's undefined, null, NaN, \"foo\", etc, search whole buffer\n    byteOffset = dir ? 0 : (buffer.length - 1)\n  }\n\n  // Normalize byteOffset: negative offsets start from the end of the buffer\n  if (byteOffset < 0) byteOffset = buffer.length + byteOffset\n  if (byteOffset >= buffer.length) {\n    if (dir) return -1\n    else byteOffset = buffer.length - 1\n  } else if (byteOffset < 0) {\n    if (dir) byteOffset = 0\n    else return -1\n  }\n\n  // Normalize val\n  if (typeof val === 'string') {\n    val = Buffer.from(val, encoding)\n  }\n\n  // Finally, search either indexOf (if dir is true) or lastIndexOf\n  if (Buffer.isBuffer(val)) {\n    // Special case: looking for empty string/buffer always fails\n    if (val.length === 0) {\n      return -1\n    }\n    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)\n  } else if (typeof val === 'number') {\n    val = val & 0xFF // Search for a byte value [0-255]\n    if (typeof Uint8Array.prototype.indexOf === 'function') {\n      if (dir) {\n        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)\n      } else {\n        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)\n      }\n    }\n    return arrayIndexOf(buffer, [val], byteOffset, encoding, dir)\n  }\n\n  throw new TypeError('val must be string, number or Buffer')\n}\n\nfunction arrayIndexOf (arr, val, byteOffset, encoding, dir) {\n  var indexSize = 1\n  var arrLength = arr.length\n  var valLength = val.length\n\n  if (encoding !== undefined) {\n    encoding = String(encoding).toLowerCase()\n    if (encoding === 'ucs2' || encoding === 'ucs-2' ||\n        encoding === 'utf16le' || encoding === 'utf-16le') {\n      if (arr.length < 2 || val.length < 2) {\n        return -1\n      }\n      indexSize = 2\n      arrLength /= 2\n      valLength /= 2\n      byteOffset /= 2\n    }\n  }\n\n  function read (buf, i) {\n    if (indexSize === 1) {\n      return buf[i]\n    } else {\n      return buf.readUInt16BE(i * indexSize)\n    }\n  }\n\n  var i\n  if (dir) {\n    var foundIndex = -1\n    for (i = byteOffset; i < arrLength; i++) {\n      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {\n        if (foundIndex === -1) foundIndex = i\n        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize\n      } else {\n        if (foundIndex !== -1) i -= i - foundIndex\n        foundIndex = -1\n      }\n    }\n  } else {\n    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength\n    for (i = byteOffset; i >= 0; i--) {\n      var found = true\n      for (var j = 0; j < valLength; j++) {\n        if (read(arr, i + j) !== read(val, j)) {\n          found = false\n          break\n        }\n      }\n      if (found) return i\n    }\n  }\n\n  return -1\n}\n\nBuffer.prototype.includes = function includes (val, byteOffset, encoding) {\n  return this.indexOf(val, byteOffset, encoding) !== -1\n}\n\nBuffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {\n  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)\n}\n\nBuffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {\n  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)\n}\n\nfunction hexWrite (buf, string, offset, length) {\n  offset = Number(offset) || 0\n  var remaining = buf.length - offset\n  if (!length) {\n    length = remaining\n  } else {\n    length = Number(length)\n    if (length > remaining) {\n      length = remaining\n    }\n  }\n\n  var strLen = string.length\n\n  if (length > strLen / 2) {\n    length = strLen / 2\n  }\n  for (var i = 0; i < length; ++i) {\n    var parsed = parseInt(string.substr(i * 2, 2), 16)\n    if (numberIsNaN(parsed)) return i\n    buf[offset + i] = parsed\n  }\n  return i\n}\n\nfunction utf8Write (buf, string, offset, length) {\n  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)\n}\n\nfunction asciiWrite (buf, string, offset, length) {\n  return blitBuffer(asciiToBytes(string), buf, offset, length)\n}\n\nfunction latin1Write (buf, string, offset, length) {\n  return asciiWrite(buf, string, offset, length)\n}\n\nfunction base64Write (buf, string, offset, length) {\n  return blitBuffer(base64ToBytes(string), buf, offset, length)\n}\n\nfunction ucs2Write (buf, string, offset, length) {\n  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)\n}\n\nBuffer.prototype.write = function write (string, offset, length, encoding) {\n  // Buffer#write(string)\n  if (offset === undefined) {\n    encoding = 'utf8'\n    length = this.length\n    offset = 0\n  // Buffer#write(string, encoding)\n  } else if (length === undefined && typeof offset === 'string') {\n    encoding = offset\n    length = this.length\n    offset = 0\n  // Buffer#write(string, offset[, length][, encoding])\n  } else if (isFinite(offset)) {\n    offset = offset >>> 0\n    if (isFinite(length)) {\n      length = length >>> 0\n      if (encoding === undefined) encoding = 'utf8'\n    } else {\n      encoding = length\n      length = undefined\n    }\n  } else {\n    throw new Error(\n      'Buffer.write(string, encoding, offset[, length]) is no longer supported'\n    )\n  }\n\n  var remaining = this.length - offset\n  if (length === undefined || length > remaining) length = remaining\n\n  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {\n    throw new RangeError('Attempt to write outside buffer bounds')\n  }\n\n  if (!encoding) encoding = 'utf8'\n\n  var loweredCase = false\n  for (;;) {\n    switch (encoding) {\n      case 'hex':\n        return hexWrite(this, string, offset, length)\n\n      case 'utf8':\n      case 'utf-8':\n        return utf8Write(this, string, offset, length)\n\n      case 'ascii':\n        return asciiWrite(this, string, offset, length)\n\n      case 'latin1':\n      case 'binary':\n        return latin1Write(this, string, offset, length)\n\n      case 'base64':\n        // Warning: maxLength not taken into account in base64Write\n        return base64Write(this, string, offset, length)\n\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return ucs2Write(this, string, offset, length)\n\n      default:\n        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)\n        encoding = ('' + encoding).toLowerCase()\n        loweredCase = true\n    }\n  }\n}\n\nBuffer.prototype.toJSON = function toJSON () {\n  return {\n    type: 'Buffer',\n    data: Array.prototype.slice.call(this._arr || this, 0)\n  }\n}\n\nfunction base64Slice (buf, start, end) {\n  if (start === 0 && end === buf.length) {\n    return base64.fromByteArray(buf)\n  } else {\n    return base64.fromByteArray(buf.slice(start, end))\n  }\n}\n\nfunction utf8Slice (buf, start, end) {\n  end = Math.min(buf.length, end)\n  var res = []\n\n  var i = start\n  while (i < end) {\n    var firstByte = buf[i]\n    var codePoint = null\n    var bytesPerSequence = (firstByte > 0xEF) ? 4\n      : (firstByte > 0xDF) ? 3\n        : (firstByte > 0xBF) ? 2\n          : 1\n\n    if (i + bytesPerSequence <= end) {\n      var secondByte, thirdByte, fourthByte, tempCodePoint\n\n      switch (bytesPerSequence) {\n        case 1:\n          if (firstByte < 0x80) {\n            codePoint = firstByte\n          }\n          break\n        case 2:\n          secondByte = buf[i + 1]\n          if ((secondByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)\n            if (tempCodePoint > 0x7F) {\n              codePoint = tempCodePoint\n            }\n          }\n          break\n        case 3:\n          secondByte = buf[i + 1]\n          thirdByte = buf[i + 2]\n          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)\n            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {\n              codePoint = tempCodePoint\n            }\n          }\n          break\n        case 4:\n          secondByte = buf[i + 1]\n          thirdByte = buf[i + 2]\n          fourthByte = buf[i + 3]\n          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)\n            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {\n              codePoint = tempCodePoint\n            }\n          }\n      }\n    }\n\n    if (codePoint === null) {\n      // we did not generate a valid codePoint so insert a\n      // replacement char (U+FFFD) and advance only 1 byte\n      codePoint = 0xFFFD\n      bytesPerSequence = 1\n    } else if (codePoint > 0xFFFF) {\n      // encode to utf16 (surrogate pair dance)\n      codePoint -= 0x10000\n      res.push(codePoint >>> 10 & 0x3FF | 0xD800)\n      codePoint = 0xDC00 | codePoint & 0x3FF\n    }\n\n    res.push(codePoint)\n    i += bytesPerSequence\n  }\n\n  return decodeCodePointsArray(res)\n}\n\n// Based on http://stackoverflow.com/a/22747272/680742, the browser with\n// the lowest limit is Chrome, with 0x10000 args.\n// We go 1 magnitude less, for safety\nvar MAX_ARGUMENTS_LENGTH = 0x1000\n\nfunction decodeCodePointsArray (codePoints) {\n  var len = codePoints.length\n  if (len <= MAX_ARGUMENTS_LENGTH) {\n    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()\n  }\n\n  // Decode in chunks to avoid \"call stack size exceeded\".\n  var res = ''\n  var i = 0\n  while (i < len) {\n    res += String.fromCharCode.apply(\n      String,\n      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)\n    )\n  }\n  return res\n}\n\nfunction asciiSlice (buf, start, end) {\n  var ret = ''\n  end = Math.min(buf.length, end)\n\n  for (var i = start; i < end; ++i) {\n    ret += String.fromCharCode(buf[i] & 0x7F)\n  }\n  return ret\n}\n\nfunction latin1Slice (buf, start, end) {\n  var ret = ''\n  end = Math.min(buf.length, end)\n\n  for (var i = start; i < end; ++i) {\n    ret += String.fromCharCode(buf[i])\n  }\n  return ret\n}\n\nfunction hexSlice (buf, start, end) {\n  var len = buf.length\n\n  if (!start || start < 0) start = 0\n  if (!end || end < 0 || end > len) end = len\n\n  var out = ''\n  for (var i = start; i < end; ++i) {\n    out += hexSliceLookupTable[buf[i]]\n  }\n  return out\n}\n\nfunction utf16leSlice (buf, start, end) {\n  var bytes = buf.slice(start, end)\n  var res = ''\n  for (var i = 0; i < bytes.length; i += 2) {\n    res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))\n  }\n  return res\n}\n\nBuffer.prototype.slice = function slice (start, end) {\n  var len = this.length\n  start = ~~start\n  end = end === undefined ? len : ~~end\n\n  if (start < 0) {\n    start += len\n    if (start < 0) start = 0\n  } else if (start > len) {\n    start = len\n  }\n\n  if (end < 0) {\n    end += len\n    if (end < 0) end = 0\n  } else if (end > len) {\n    end = len\n  }\n\n  if (end < start) end = start\n\n  var newBuf = this.subarray(start, end)\n  // Return an augmented `Uint8Array` instance\n  Object.setPrototypeOf(newBuf, Buffer.prototype)\n\n  return newBuf\n}\n\n/*\n * Need to make sure that buffer isn't trying to write out of bounds.\n */\nfunction checkOffset (offset, ext, length) {\n  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')\n  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')\n}\n\nBuffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  var val = this[offset]\n  var mul = 1\n  var i = 0\n  while (++i < byteLength && (mul *= 0x100)) {\n    val += this[offset + i] * mul\n  }\n\n  return val\n}\n\nBuffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) {\n    checkOffset(offset, byteLength, this.length)\n  }\n\n  var val = this[offset + --byteLength]\n  var mul = 1\n  while (byteLength > 0 && (mul *= 0x100)) {\n    val += this[offset + --byteLength] * mul\n  }\n\n  return val\n}\n\nBuffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 1, this.length)\n  return this[offset]\n}\n\nBuffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  return this[offset] | (this[offset + 1] << 8)\n}\n\nBuffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  return (this[offset] << 8) | this[offset + 1]\n}\n\nBuffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return ((this[offset]) |\n      (this[offset + 1] << 8) |\n      (this[offset + 2] << 16)) +\n      (this[offset + 3] * 0x1000000)\n}\n\nBuffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset] * 0x1000000) +\n    ((this[offset + 1] << 16) |\n    (this[offset + 2] << 8) |\n    this[offset + 3])\n}\n\nBuffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  var val = this[offset]\n  var mul = 1\n  var i = 0\n  while (++i < byteLength && (mul *= 0x100)) {\n    val += this[offset + i] * mul\n  }\n  mul *= 0x80\n\n  if (val >= mul) val -= Math.pow(2, 8 * byteLength)\n\n  return val\n}\n\nBuffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  var i = byteLength\n  var mul = 1\n  var val = this[offset + --i]\n  while (i > 0 && (mul *= 0x100)) {\n    val += this[offset + --i] * mul\n  }\n  mul *= 0x80\n\n  if (val >= mul) val -= Math.pow(2, 8 * byteLength)\n\n  return val\n}\n\nBuffer.prototype.readInt8 = function readInt8 (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 1, this.length)\n  if (!(this[offset] & 0x80)) return (this[offset])\n  return ((0xff - this[offset] + 1) * -1)\n}\n\nBuffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  var val = this[offset] | (this[offset + 1] << 8)\n  return (val & 0x8000) ? val | 0xFFFF0000 : val\n}\n\nBuffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  var val = this[offset + 1] | (this[offset] << 8)\n  return (val & 0x8000) ? val | 0xFFFF0000 : val\n}\n\nBuffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset]) |\n    (this[offset + 1] << 8) |\n    (this[offset + 2] << 16) |\n    (this[offset + 3] << 24)\n}\n\nBuffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset] << 24) |\n    (this[offset + 1] << 16) |\n    (this[offset + 2] << 8) |\n    (this[offset + 3])\n}\n\nBuffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n  return ieee754.read(this, offset, true, 23, 4)\n}\n\nBuffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n  return ieee754.read(this, offset, false, 23, 4)\n}\n\nBuffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 8, this.length)\n  return ieee754.read(this, offset, true, 52, 8)\n}\n\nBuffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 8, this.length)\n  return ieee754.read(this, offset, false, 52, 8)\n}\n\nfunction checkInt (buf, value, offset, ext, max, min) {\n  if (!Buffer.isBuffer(buf)) throw new TypeError('\"buffer\" argument must be a Buffer instance')\n  if (value > max || value < min) throw new RangeError('\"value\" argument is out of bounds')\n  if (offset + ext > buf.length) throw new RangeError('Index out of range')\n}\n\nBuffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) {\n    var maxBytes = Math.pow(2, 8 * byteLength) - 1\n    checkInt(this, value, offset, byteLength, maxBytes, 0)\n  }\n\n  var mul = 1\n  var i = 0\n  this[offset] = value & 0xFF\n  while (++i < byteLength && (mul *= 0x100)) {\n    this[offset + i] = (value / mul) & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) {\n    var maxBytes = Math.pow(2, 8 * byteLength) - 1\n    checkInt(this, value, offset, byteLength, maxBytes, 0)\n  }\n\n  var i = byteLength - 1\n  var mul = 1\n  this[offset + i] = value & 0xFF\n  while (--i >= 0 && (mul *= 0x100)) {\n    this[offset + i] = (value / mul) & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)\n  this[offset] = (value & 0xff)\n  return offset + 1\n}\n\nBuffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)\n  this[offset] = (value & 0xff)\n  this[offset + 1] = (value >>> 8)\n  return offset + 2\n}\n\nBuffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)\n  this[offset] = (value >>> 8)\n  this[offset + 1] = (value & 0xff)\n  return offset + 2\n}\n\nBuffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)\n  this[offset + 3] = (value >>> 24)\n  this[offset + 2] = (value >>> 16)\n  this[offset + 1] = (value >>> 8)\n  this[offset] = (value & 0xff)\n  return offset + 4\n}\n\nBuffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)\n  this[offset] = (value >>> 24)\n  this[offset + 1] = (value >>> 16)\n  this[offset + 2] = (value >>> 8)\n  this[offset + 3] = (value & 0xff)\n  return offset + 4\n}\n\nBuffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    var limit = Math.pow(2, (8 * byteLength) - 1)\n\n    checkInt(this, value, offset, byteLength, limit - 1, -limit)\n  }\n\n  var i = 0\n  var mul = 1\n  var sub = 0\n  this[offset] = value & 0xFF\n  while (++i < byteLength && (mul *= 0x100)) {\n    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {\n      sub = 1\n    }\n    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    var limit = Math.pow(2, (8 * byteLength) - 1)\n\n    checkInt(this, value, offset, byteLength, limit - 1, -limit)\n  }\n\n  var i = byteLength - 1\n  var mul = 1\n  var sub = 0\n  this[offset + i] = value & 0xFF\n  while (--i >= 0 && (mul *= 0x100)) {\n    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {\n      sub = 1\n    }\n    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)\n  if (value < 0) value = 0xff + value + 1\n  this[offset] = (value & 0xff)\n  return offset + 1\n}\n\nBuffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)\n  this[offset] = (value & 0xff)\n  this[offset + 1] = (value >>> 8)\n  return offset + 2\n}\n\nBuffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)\n  this[offset] = (value >>> 8)\n  this[offset + 1] = (value & 0xff)\n  return offset + 2\n}\n\nBuffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)\n  this[offset] = (value & 0xff)\n  this[offset + 1] = (value >>> 8)\n  this[offset + 2] = (value >>> 16)\n  this[offset + 3] = (value >>> 24)\n  return offset + 4\n}\n\nBuffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)\n  if (value < 0) value = 0xffffffff + value + 1\n  this[offset] = (value >>> 24)\n  this[offset + 1] = (value >>> 16)\n  this[offset + 2] = (value >>> 8)\n  this[offset + 3] = (value & 0xff)\n  return offset + 4\n}\n\nfunction checkIEEE754 (buf, value, offset, ext, max, min) {\n  if (offset + ext > buf.length) throw new RangeError('Index out of range')\n  if (offset < 0) throw new RangeError('Index out of range')\n}\n\nfunction writeFloat (buf, value, offset, littleEndian, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)\n  }\n  ieee754.write(buf, value, offset, littleEndian, 23, 4)\n  return offset + 4\n}\n\nBuffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {\n  return writeFloat(this, value, offset, true, noAssert)\n}\n\nBuffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {\n  return writeFloat(this, value, offset, false, noAssert)\n}\n\nfunction writeDouble (buf, value, offset, littleEndian, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)\n  }\n  ieee754.write(buf, value, offset, littleEndian, 52, 8)\n  return offset + 8\n}\n\nBuffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {\n  return writeDouble(this, value, offset, true, noAssert)\n}\n\nBuffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {\n  return writeDouble(this, value, offset, false, noAssert)\n}\n\n// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)\nBuffer.prototype.copy = function copy (target, targetStart, start, end) {\n  if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')\n  if (!start) start = 0\n  if (!end && end !== 0) end = this.length\n  if (targetStart >= target.length) targetStart = target.length\n  if (!targetStart) targetStart = 0\n  if (end > 0 && end < start) end = start\n\n  // Copy 0 bytes; we're done\n  if (end === start) return 0\n  if (target.length === 0 || this.length === 0) return 0\n\n  // Fatal error conditions\n  if (targetStart < 0) {\n    throw new RangeError('targetStart out of bounds')\n  }\n  if (start < 0 || start >= this.length) throw new RangeError('Index out of range')\n  if (end < 0) throw new RangeError('sourceEnd out of bounds')\n\n  // Are we oob?\n  if (end > this.length) end = this.length\n  if (target.length - targetStart < end - start) {\n    end = target.length - targetStart + start\n  }\n\n  var len = end - start\n\n  if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {\n    // Use built-in when available, missing from IE11\n    this.copyWithin(targetStart, start, end)\n  } else if (this === target && start < targetStart && targetStart < end) {\n    // descending copy from end\n    for (var i = len - 1; i >= 0; --i) {\n      target[i + targetStart] = this[i + start]\n    }\n  } else {\n    Uint8Array.prototype.set.call(\n      target,\n      this.subarray(start, end),\n      targetStart\n    )\n  }\n\n  return len\n}\n\n// Usage:\n//    buffer.fill(number[, offset[, end]])\n//    buffer.fill(buffer[, offset[, end]])\n//    buffer.fill(string[, offset[, end]][, encoding])\nBuffer.prototype.fill = function fill (val, start, end, encoding) {\n  // Handle string cases:\n  if (typeof val === 'string') {\n    if (typeof start === 'string') {\n      encoding = start\n      start = 0\n      end = this.length\n    } else if (typeof end === 'string') {\n      encoding = end\n      end = this.length\n    }\n    if (encoding !== undefined && typeof encoding !== 'string') {\n      throw new TypeError('encoding must be a string')\n    }\n    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {\n      throw new TypeError('Unknown encoding: ' + encoding)\n    }\n    if (val.length === 1) {\n      var code = val.charCodeAt(0)\n      if ((encoding === 'utf8' && code < 128) ||\n          encoding === 'latin1') {\n        // Fast path: If `val` fits into a single byte, use that numeric value.\n        val = code\n      }\n    }\n  } else if (typeof val === 'number') {\n    val = val & 255\n  } else if (typeof val === 'boolean') {\n    val = Number(val)\n  }\n\n  // Invalid ranges are not set to a default, so can range check early.\n  if (start < 0 || this.length < start || this.length < end) {\n    throw new RangeError('Out of range index')\n  }\n\n  if (end <= start) {\n    return this\n  }\n\n  start = start >>> 0\n  end = end === undefined ? this.length : end >>> 0\n\n  if (!val) val = 0\n\n  var i\n  if (typeof val === 'number') {\n    for (i = start; i < end; ++i) {\n      this[i] = val\n    }\n  } else {\n    var bytes = Buffer.isBuffer(val)\n      ? val\n      : Buffer.from(val, encoding)\n    var len = bytes.length\n    if (len === 0) {\n      throw new TypeError('The value \"' + val +\n        '\" is invalid for argument \"value\"')\n    }\n    for (i = 0; i < end - start; ++i) {\n      this[i + start] = bytes[i % len]\n    }\n  }\n\n  return this\n}\n\n// HELPER FUNCTIONS\n// ================\n\nvar INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g\n\nfunction base64clean (str) {\n  // Node takes equal signs as end of the Base64 encoding\n  str = str.split('=')[0]\n  // Node strips out invalid characters like \\n and \\t from the string, base64-js does not\n  str = str.trim().replace(INVALID_BASE64_RE, '')\n  // Node converts strings with length < 2 to ''\n  if (str.length < 2) return ''\n  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not\n  while (str.length % 4 !== 0) {\n    str = str + '='\n  }\n  return str\n}\n\nfunction utf8ToBytes (string, units) {\n  units = units || Infinity\n  var codePoint\n  var length = string.length\n  var leadSurrogate = null\n  var bytes = []\n\n  for (var i = 0; i < length; ++i) {\n    codePoint = string.charCodeAt(i)\n\n    // is surrogate component\n    if (codePoint > 0xD7FF && codePoint < 0xE000) {\n      // last char was a lead\n      if (!leadSurrogate) {\n        // no lead yet\n        if (codePoint > 0xDBFF) {\n          // unexpected trail\n          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n          continue\n        } else if (i + 1 === length) {\n          // unpaired lead\n          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n          continue\n        }\n\n        // valid lead\n        leadSurrogate = codePoint\n\n        continue\n      }\n\n      // 2 leads in a row\n      if (codePoint < 0xDC00) {\n        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n        leadSurrogate = codePoint\n        continue\n      }\n\n      // valid surrogate pair\n      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000\n    } else if (leadSurrogate) {\n      // valid bmp char, but last char was a lead\n      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n    }\n\n    leadSurrogate = null\n\n    // encode utf8\n    if (codePoint < 0x80) {\n      if ((units -= 1) < 0) break\n      bytes.push(codePoint)\n    } else if (codePoint < 0x800) {\n      if ((units -= 2) < 0) break\n      bytes.push(\n        codePoint >> 0x6 | 0xC0,\n        codePoint & 0x3F | 0x80\n      )\n    } else if (codePoint < 0x10000) {\n      if ((units -= 3) < 0) break\n      bytes.push(\n        codePoint >> 0xC | 0xE0,\n        codePoint >> 0x6 & 0x3F | 0x80,\n        codePoint & 0x3F | 0x80\n      )\n    } else if (codePoint < 0x110000) {\n      if ((units -= 4) < 0) break\n      bytes.push(\n        codePoint >> 0x12 | 0xF0,\n        codePoint >> 0xC & 0x3F | 0x80,\n        codePoint >> 0x6 & 0x3F | 0x80,\n        codePoint & 0x3F | 0x80\n      )\n    } else {\n      throw new Error('Invalid code point')\n    }\n  }\n\n  return bytes\n}\n\nfunction asciiToBytes (str) {\n  var byteArray = []\n  for (var i = 0; i < str.length; ++i) {\n    // Node's code seems to be doing this and not & 0x7F..\n    byteArray.push(str.charCodeAt(i) & 0xFF)\n  }\n  return byteArray\n}\n\nfunction utf16leToBytes (str, units) {\n  var c, hi, lo\n  var byteArray = []\n  for (var i = 0; i < str.length; ++i) {\n    if ((units -= 2) < 0) break\n\n    c = str.charCodeAt(i)\n    hi = c >> 8\n    lo = c % 256\n    byteArray.push(lo)\n    byteArray.push(hi)\n  }\n\n  return byteArray\n}\n\nfunction base64ToBytes (str) {\n  return base64.toByteArray(base64clean(str))\n}\n\nfunction blitBuffer (src, dst, offset, length) {\n  for (var i = 0; i < length; ++i) {\n    if ((i + offset >= dst.length) || (i >= src.length)) break\n    dst[i + offset] = src[i]\n  }\n  return i\n}\n\n// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass\n// the `instanceof` check but they should be treated as of that type.\n// See: https://github.com/feross/buffer/issues/166\nfunction isInstance (obj, type) {\n  return obj instanceof type ||\n    (obj != null && obj.constructor != null && obj.constructor.name != null &&\n      obj.constructor.name === type.name)\n}\nfunction numberIsNaN (obj) {\n  // For IE11 support\n  return obj !== obj // eslint-disable-line no-self-compare\n}\n\n// Create lookup table for `toString('hex')`\n// See: https://github.com/feross/buffer/issues/219\nvar hexSliceLookupTable = (function () {\n  var alphabet = '0123456789abcdef'\n  var table = new Array(256)\n  for (var i = 0; i < 16; ++i) {\n    var i16 = i * 16\n    for (var j = 0; j < 16; ++j) {\n      table[i16 + j] = alphabet[i] + alphabet[j]\n    }\n  }\n  return table\n})()\n","exports.read = function (buffer, offset, isLE, mLen, nBytes) {\n  var e, m\n  var eLen = (nBytes * 8) - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var nBits = -7\n  var i = isLE ? (nBytes - 1) : 0\n  var d = isLE ? -1 : 1\n  var s = buffer[offset + i]\n\n  i += d\n\n  e = s & ((1 << (-nBits)) - 1)\n  s >>= (-nBits)\n  nBits += eLen\n  for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}\n\n  m = e & ((1 << (-nBits)) - 1)\n  e >>= (-nBits)\n  nBits += mLen\n  for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}\n\n  if (e === 0) {\n    e = 1 - eBias\n  } else if (e === eMax) {\n    return m ? NaN : ((s ? -1 : 1) * Infinity)\n  } else {\n    m = m + Math.pow(2, mLen)\n    e = e - eBias\n  }\n  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)\n}\n\nexports.write = function (buffer, value, offset, isLE, mLen, nBytes) {\n  var e, m, c\n  var eLen = (nBytes * 8) - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)\n  var i = isLE ? 0 : (nBytes - 1)\n  var d = isLE ? 1 : -1\n  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0\n\n  value = Math.abs(value)\n\n  if (isNaN(value) || value === Infinity) {\n    m = isNaN(value) ? 1 : 0\n    e = eMax\n  } else {\n    e = Math.floor(Math.log(value) / Math.LN2)\n    if (value * (c = Math.pow(2, -e)) < 1) {\n      e--\n      c *= 2\n    }\n    if (e + eBias >= 1) {\n      value += rt / c\n    } else {\n      value += rt * Math.pow(2, 1 - eBias)\n    }\n    if (value * c >= 2) {\n      e++\n      c /= 2\n    }\n\n    if (e + eBias >= eMax) {\n      m = 0\n      e = eMax\n    } else if (e + eBias >= 1) {\n      m = ((value * c) - 1) * Math.pow(2, mLen)\n      e = e + eBias\n    } else {\n      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)\n      e = 0\n    }\n  }\n\n  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}\n\n  e = (e << mLen) | m\n  eLen += mLen\n  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}\n\n  buffer[offset + i - d] |= s * 128\n}\n","'use strict';\r\n\r\nclass MIDIStream {\r\n  constructor(buffer) {\r\n    this.data = new Uint8Array(buffer);\r\n    this.byteOffset = 0;\r\n    this.lastEventTypeByte = 0x00;\r\n  }\r\n\r\n  readString(byteLength) {\r\n    var byteOffset = this.byteOffset;\r\n\r\n    for (var i = 0, str = ''; i < byteLength; i++) {\r\n      str += String.fromCharCode(this.data[byteOffset + i]);\r\n    }\r\n\r\n    this.byteOffset += byteLength;\r\n\r\n    return str;\r\n  }\r\n\r\n  readUint32() {\r\n    var byteOffset = this.byteOffset;\r\n    var value = (\r\n      (this.data[byteOffset    ] << 24) |\r\n      (this.data[byteOffset + 1] << 16) |\r\n      (this.data[byteOffset + 2] <<  8) |\r\n      (this.data[byteOffset + 3]      )\r\n    );\r\n\r\n    this.byteOffset += 4;\r\n\r\n    return value;\r\n  }\r\n\r\n  readUint24() {\r\n    var byteOffset = this.byteOffset;\r\n    var value = (\r\n      (this.data[byteOffset    ] << 16) |\r\n      (this.data[byteOffset + 1] <<  8) |\r\n      (this.data[byteOffset + 2]      )\r\n    );\r\n\r\n    this.byteOffset += 3;\r\n\r\n    return value;\r\n  }\r\n\r\n  readUint16() {\r\n    var byteOffset = this.byteOffset;\r\n    var value = (\r\n      (this.data[byteOffset    ] << 8) |\r\n      (this.data[byteOffset + 1]     )\r\n    );\r\n\r\n    this.byteOffset += 2;\r\n\r\n    return value;\r\n  }\r\n\r\n  readUint8() {\r\n    var byteOffset = this.byteOffset;\r\n    var value = this.data[byteOffset];\r\n\r\n    this.byteOffset += 1;\r\n\r\n    return value;\r\n  }\r\n\r\n  readInt8() {\r\n    var byteOffset = this.byteOffset;\r\n    var value = this.data[byteOffset];\r\n\r\n    if (value & 0x80 === 0x80) {\r\n      value ^= 0xFFFFFF00;\r\n    }\r\n\r\n    this.byteOffset += 1;\r\n\r\n    return value;\r\n  }\r\n\r\n  readVarUint() {\r\n    var value = 0;\r\n    var uint8;\r\n\r\n    do {\r\n      uint8 = this.readUint8();\r\n      value = (value << 7) + (uint8 & 0x7F);\r\n    } while ((uint8 & 0x80) === 0x80);\r\n\r\n    return value;\r\n  }\r\n\r\n  skip(byteLength) {\r\n    this.byteOffset += byteLength;\r\n  }\r\n\r\n  readChunk() {\r\n    var id = this.readString(4);\r\n    var length = this.readUint32();\r\n    var byteOffset = this.byteOffset;\r\n\r\n    this.byteOffset += length;\r\n\r\n    var data = this.data.slice(byteOffset, this.byteOffset);\r\n\r\n    return {\r\n      id: id,\r\n      length: length,\r\n      data: data.buffer\r\n    };\r\n  }\r\n\r\n  readEvent() {\r\n    var event = {};\r\n\r\n    event.delta = this.readVarUint();\r\n\r\n    var eventTypeByte = this.readUint8();\r\n\r\n    // system event\r\n    if ((eventTypeByte & 0xF0) === 0xF0) {\r\n      switch (eventTypeByte) {\r\n      // meta event\r\n      case 0xFF:\r\n        event.type = 'meta';\r\n\r\n        var subTypeByte = this.readUint8();\r\n        var length = this.readVarUint();\r\n\r\n        switch (subTypeByte) {\r\n        case 0x00:\r\n          event.subType = 'sequenceNumber';\r\n          if (length === 2)\r\n            event.value = this.readUint16();\r\n          else\r\n            this.skip(length);\r\n          break;\r\n        case 0x01:\r\n          event.subType = 'text';\r\n          event.value = this.readString(length);\r\n          break;\r\n        case 0x02:\r\n          event.subType = 'copyrightNotice';\r\n          event.value = this.readString(length);\r\n          break;\r\n        case 0x03:\r\n          event.subType = 'trackName';\r\n          event.value = this.readString(length);\r\n          break;\r\n        case 0x04:\r\n          event.subType = 'instrumentName';\r\n          event.value = this.readString(length);\r\n          break;\r\n        case 0x05:\r\n          event.subType = 'lyrics';\r\n          event.value = this.readString(length);\r\n          break;\r\n        case 0x06:\r\n          event.subType = 'marker';\r\n          event.value = this.readString(length);\r\n          break;\r\n        case 0x07:\r\n          event.subType = 'cuePoint';\r\n          event.value = this.readString(length);\r\n          break;\r\n        case 0x20:\r\n          event.subType = 'midiChannelPrefix';\r\n          if (length === 1)\r\n            event.value = this.readUint8();\r\n          else\r\n            this.skip(length);\r\n          break;\r\n        case 0x2F:\r\n          event.subType = 'endOfTrack';\r\n          if (length > 0)\r\n            this.skip(length);\r\n          break;\r\n        case 0x51:\r\n          event.subType = 'setTempo';\r\n          if (length === 3)\r\n            event.value = this.readUint24();\r\n          else\r\n            this.skip(length)\r\n          break;\r\n        case 0x54:\r\n          event.subType = 'smpteOffset';\r\n          if (length === 5) {\r\n            var hourByte = this.readUint8();\r\n            event.value = {\r\n              frameRate: ({\r\n                0x00: 24,\r\n                0x01: 25,\r\n                0x02: 29.97,\r\n                0x03: 30\r\n              }[hourByte >>> 6]),\r\n              hour: (hourByte & 0x3F),\r\n              minute: this.readUint8(),\r\n              second: this.readUint8(),\r\n              frame: this.readUint8(),\r\n              subFrame: this.readUint8()\r\n            };\r\n          } else {\r\n            this.skip(length);\r\n          }\r\n          break;\r\n        case 0x58:\r\n          event.subType = 'timeSignature';\r\n          if (length === 4) {\r\n            event.value = {\r\n              numerator: this.readUint8(),\r\n              denominator: 1 << this.readUint8(),\r\n              metronome: this.readUint8(),\r\n              thirtyseconds: this.readUint8()\r\n            };\r\n          } else {\r\n            this.skip(length);\r\n          }\r\n          break;\r\n        case 0x59:\r\n          event.subType = 'keySignature';\r\n          if (length === 2) {\r\n            event.value = {\r\n              key: this.readInt8(),\r\n              scale: this.readUint8()\r\n            };\r\n          } else {\r\n            this.skip(length);\r\n          }\r\n          break;\r\n        case 0x7F:\r\n          event.subType = 'sequencerSpecific';\r\n          event.value = this.readString(length);\r\n          break;\r\n        default:\r\n          event.subType = 'unknown';\r\n          event.value = this.readString(length);\r\n        }\r\n        break;\r\n      // sysex event\r\n      case 0xF0:\r\n        event.type = 'sysEx';\r\n\r\n        var length = this.readVarUint();\r\n\r\n        event.value = this.readString(length);\r\n\r\n        break;\r\n      case 0xF7:\r\n        event.type = 'dividedSysEx';\r\n\r\n        var length = this.readVarUint();\r\n\r\n        event.value = this.readString(length);\r\n\r\n        break;\r\n      default:\r\n        event.type = 'unknown';\r\n\r\n        var length = this.readVarUint();\r\n\r\n        event.value = this.readString(length);\r\n      }\r\n    // channel event\r\n    } else {\r\n      var param;\r\n\r\n      // if the high bit is low\r\n      // use running event type mode\r\n      if ((eventTypeByte & 0x80) === 0x00) {\r\n        param = eventTypeByte;\r\n        eventTypeByte = this.lastEventTypeByte;\r\n      } else {\r\n        param = this.readUint8();\r\n        this.lastEventTypeByte = eventTypeByte;\r\n      }\r\n\r\n      var eventType = eventTypeByte >> 4;\r\n\r\n      event.channel = eventTypeByte & 0x0F;\r\n      event.type = 'channel';\r\n\r\n      switch (eventType) {\r\n      case 0x08:\r\n        event.subType = 'noteOff';\r\n\r\n        event.value = {\r\n          noteNumber: param,\r\n          velocity: this.readUint8()\r\n        };\r\n        break;\r\n      case 0x09:\r\n        event.value = {\r\n          noteNumber: param,\r\n          velocity: this.readUint8()\r\n        };\r\n\r\n        // some midi implementations use a noteOn\r\n        // event with 0 velocity to denote noteOff\r\n        if (event.value.velocity === 0) {\r\n          event.subType = 'noteOff';\r\n        } else {\r\n          event.subType = 'noteOn';\r\n        }\r\n        break;\r\n      case 0x0A:\r\n        event.subType = 'noteAftertouch';\r\n\r\n        event.value = {\r\n          noteNumber: param,\r\n          amount: this.readUint8()\r\n        };\r\n        break;\r\n      case 0x0B:\r\n        event.subType = 'controller';\r\n\r\n        event.value = {\r\n          controllerNumber: param,\r\n          controllerValue: this.readUint8()\r\n        };\r\n        break;\r\n      case 0x0C:\r\n        event.subType = 'programChange';\r\n        event.value = param;\r\n        break;\r\n      case 0x0D:\r\n        event.subType = 'channelAftertouch';\r\n        event.value = param;\r\n        break;\r\n      case 0x0E:\r\n        event.subType = 'pitchBend';\r\n        event.value = param + (this.readUint8() << 7);\r\n        break;\r\n      default:\r\n        event.subType = 'unknown';\r\n        event.value = (param << 8) + this.readUint8();\r\n      }\r\n    }\r\n\r\n    return event;\r\n  }\r\n};\r\n\r\nmodule.exports = MIDIStream;\r\n","'use strict';\r\n\r\nconst WAV = require('./wav');\r\nconst MIDIStream = require('./midi');\r\nconst Timer = require('./utils/timer');\r\n\r\nmodule.exports = function midiToWav(buffer, args = {}) {\r\n  if (args.verbose) {\r\n    console.log('parsing MIDI header...');\r\n  }\r\n\r\n  const midiStream = new MIDIStream(buffer);\r\n  const header = midiStream.readChunk();\r\n\r\n  if (header.id !== 'MThd' || header.length !== 6) {\r\n    throw new SyntaxError('malformed header');\r\n  }\r\n\r\n  const headerStream = new MIDIStream(header.data);\r\n  const formatType = headerStream.readUint16();\r\n  const trackCount = headerStream.readUint16();\r\n  const timeDivision = headerStream.readUint16();\r\n  const tracks = [];\r\n  const progression = [];\r\n  const events = [];\r\n  let maxAmplitude;\r\n\r\n  for (let i = 0; i < trackCount; i++) {\r\n    if (args.verbose) {\r\n      console.log(`parsing track ${i + 1}...`);\r\n    }\r\n\r\n    const trackChunk = midiStream.readChunk();\r\n\r\n    if (trackChunk.id !== 'MTrk') {\r\n      continue;\r\n    }\r\n\r\n    const trackStream = new MIDIStream(trackChunk.data);\r\n    const track = [];\r\n    let keep = true;\r\n\r\n    // determine whether applied filter will remove the current track while populating it\r\n    while (keep && trackStream.byteOffset < trackChunk.length) {\r\n      let event = trackStream.readEvent();\r\n      track.push(event);\r\n\r\n      if (typeof event.value === 'string') {\r\n        if (args.verbose) {\r\n          console.log(`{\"${event.subType}\":\"${event.value}\"}`);\r\n        }\r\n\r\n        if (Array.isArray(args.Skip)) {\r\n          for (let t = 0; t < args.Skip.length; t++) {\r\n            if (args.Skip[t][event.subType] === event.value) {\r\n              if (args.verbose) {\r\n                console.log(`skip match found: {\"${event.subType}\":\"${event.value}\"}`);\r\n              }\r\n\r\n              keep = false;\r\n              break;\r\n            }\r\n          }\r\n        }\r\n      }\r\n    }\r\n\r\n    if (typeof args.Skip === 'function') {\r\n      keep = !args.Skip(track);\r\n    }\r\n\r\n    if (keep) {\r\n      tracks.push(track);\r\n    } else if (args.verbose) {\r\n      console.log(`skipping track ${i + 1}...`);\r\n    }\r\n  }\r\n\r\n  if (timeDivision >>> 15 === 0) {\r\n    // use microseconds per beat\r\n    const timer = new Timer(timeDivision);\r\n\r\n    if (args.verbose) {\r\n      console.log('initializing timer...');\r\n    }\r\n\r\n    // set up timer with setTempo events\r\n    for (let i = 0, delta = 0, ticks = 0, event; i < tracks[0].length; i++) {\r\n      event = tracks[0][i];\r\n      delta += event.delta;\r\n      ticks += event.delta;\r\n\r\n      if (event.subType === 'setTempo') {\r\n        timer.addCriticalPoint(delta, event.value);\r\n        delta = 0;\r\n      }\r\n    }\r\n\r\n    // generate note data\r\n    for (let i = 0; i < tracks.length; i++) {\r\n      if (args.verbose) {\r\n        console.log(`generating progression from track ${i + 1}...`);\r\n      }\r\n\r\n      let track = tracks[i];\r\n      let delta = 0;\r\n      let map = new Map();\r\n\r\n      for (let j = 0; j < track.length; j++) {\r\n        let event = track[j];\r\n        delta += event.delta;\r\n\r\n        if (event.type === 'channel') {\r\n          const semitone = event.value.noteNumber;\r\n\r\n          if (event.subType === 'noteOn') {\r\n            let velocity = event.value.velocity;\r\n            let offset = timer.getTime(delta);\r\n\r\n            // use stack for simultaneous identical notes\r\n            if (map.has(semitone)) {\r\n              map.get(semitone).push({offset, velocity});\r\n            } else {\r\n              map.set(semitone, [{offset, velocity}]);\r\n            }\r\n\r\n            // to determine maximum total velocity for normalizing volume\r\n            events.push({velocity, delta, note: true});\r\n          } else if (event.subType === 'noteOff') {\r\n            const notes = map.get(semitone);\r\n\t          const note = notes ? notes.pop() : { offset: 0, velocity: 0 };\r\n\r\n            progression.push({\r\n              note: WAV.note(semitone),\r\n              time: timer.getTime(delta) - note.offset,\r\n              amplitude: note.velocity / 128,\r\n              offset: note.offset,\r\n            });\r\n\r\n            // to determine maximum total velocity for normalizing volume\r\n            events.push({velocity: note.velocity, delta, note: false});\r\n          }\r\n        } else if (args.verbose && event.type === 'meta') {\r\n          if (typeof event.value === 'string') {\r\n            console.log(`${timer.getTime(delta).toFixed(2)}s ${event.subType}: ${event.value}`);\r\n          }\r\n        }\r\n      }\r\n    }\r\n\r\n    if (args.verbose) {\r\n      console.log('normalizing volume...');\r\n    }\r\n\r\n    events.sort(function (a, b) {\r\n      return a.delta - b.delta || a.note - b.note;\r\n    });\r\n\r\n    if (args.verbose) {\r\n      console.log('total notes:', progression.length);\r\n      console.log('total time:', timer.getTime(events[events.length - 1].delta), 'seconds');\r\n    }\r\n\r\n    let maxVelocity = 1;\r\n    let maxVelocityTime = 0;\r\n    let velocity = 1;\r\n    let maxChord = 0;\r\n    let maxChordTime = 0;\r\n    let chord = 0;\r\n\r\n    for (const event of events) {\r\n      if (event.note) {\r\n        velocity += event.velocity;\r\n        chord++;\r\n\r\n        if (velocity > maxVelocity) {\r\n          maxVelocity = velocity;\r\n          maxVelocityTime = timer.getTime(event.delta);\r\n        }\r\n\r\n        if (chord > maxChord) {\r\n          maxChord = chord;\r\n          maxChordTime = timer.getTime(event.delta);\r\n        }\r\n      } else {\r\n        velocity -= event.velocity;\r\n        chord--;\r\n      }\r\n    }\r\n\r\n    // scaling factor for amplitude\r\n    maxAmplitude = 128 / maxVelocity;\r\n\r\n    if (args.verbose) {\r\n      console.log('setting volume to', maxAmplitude);\r\n      console.log('  maximum chord of', maxChord, 'at', maxChordTime, 'seconds');\r\n      console.log('  maximum velocity of', maxVelocity - 1, 'at', maxVelocityTime, 'seconds');\r\n    }\r\n  } else {\r\n    // use frames per second\r\n    // not yet implemented\r\n\r\n    console.log('Detected unsupported MIDI timing mode');\r\n\r\n    return null;\r\n\r\n    /*\r\n    let framesPerSecond = (division >>> 8) & 0x7F;\r\n    let ticksPerFrame = division & 0xFF;\r\n\r\n    if (framesPerSecond === 29) {\r\n      framesPerSecond = 29.97;\r\n    }\r\n\r\n    // seconds per tick = 1 / frames per second / ticks per frame\r\n    secsPerTick = 1 / framesPerSecond / ticksPerFrame;\r\n    */\r\n  }\r\n\r\n  // set to mono\r\n  args.channels = 1;\r\n\r\n  if (args.verbose) {\r\n    console.log('generating WAV buffer...');\r\n  }\r\n\r\n  const wav = new WAV(args.channels, args.sampleRate, args.bitsPerSample);\r\n\r\n  wav.writeProgression(progression, maxAmplitude, [0], true, true, args.duration);\r\n\r\n  return wav;\r\n};\r\n","'use strict';\r\n\r\n// utility class to calculate time from delta ticks\r\n// when MIDI file has several `setTempo` events\r\nclass Timer {\r\n  constructor(ticksPerBeat) {\r\n    this.ticksPerBeat = ticksPerBeat;\r\n    this.criticalPoints = [];\r\n  }\r\n\r\n  // delta represents ticks since last time change\r\n  addCriticalPoint(delta, microsecondsPerBeat) {\r\n    this.criticalPoints.push({\r\n      delta,\r\n      microsecondsPerBeat\r\n    });\r\n  }\r\n\r\n  getTime(delta) {\r\n    const microsecondsPerSecond = 1000000;\r\n    let time = 0;\r\n    // midi standard initializes file with this value\r\n    let microsecondsPerBeat = 500000;\r\n\r\n    // iterate through time changes while decrementing delta ticks to 0\r\n    for (let i = 0, criticalPoint; i < this.criticalPoints.length && delta > 0; i++) {\r\n      criticalPoint = this.criticalPoints[i];\r\n\r\n      // incrementally calculate the time passed for each range of timing\r\n      if (delta >= criticalPoint.delta) {\r\n        time += criticalPoint.delta * microsecondsPerBeat / this.ticksPerBeat / microsecondsPerSecond;\r\n        delta -= criticalPoint.delta;\r\n      } else {\r\n        time += delta * microsecondsPerBeat / this.ticksPerBeat / microsecondsPerSecond;\r\n        delta = 0;\r\n      }\r\n\r\n      microsecondsPerBeat = criticalPoint.microsecondsPerBeat;\r\n    }\r\n\r\n    time += delta * microsecondsPerBeat / this.ticksPerBeat / microsecondsPerSecond;\r\n\r\n    return time;\r\n  }\r\n};\r\n\r\nmodule.exports = Timer;\r\n","'use strict';\r\n\r\nclass WAV {\r\n  static semitone(note = 'REST') {\r\n    // matches occurence of A through G\r\n    // followed by positive or negative integer\r\n    // followed by 0 to 2 occurences of flat or sharp\r\n    const re = /^([A-G])(\\-?\\d+)(b{0,2}|#{0,2})$/;\r\n\r\n    // if semitone is unrecognized, assume REST\r\n    if (!re.test(note)) {\r\n      return -Infinity;\r\n    }\r\n\r\n    // parse substrings of note\r\n    const [, tone, octave, accidental] = note.match(re);\r\n\r\n    // semitone indexed relative to A4 == 69 for compatibility with MIDI\r\n    const tones = {C: 0, D: 2, E: 4, F: 5, G: 7, A: 9, B: 11};\r\n    const octaves = {'-1': 0, 0: 1, 1: 2, 2: 3, 3: 4, 4: 5, 5: 6, 6: 7, 7: 8, 8: 9, 9: 10, 10: 11};\r\n    const accidentals = {bb: -2, b: -1, '': 0, '#': 1, '##': 2};\r\n\r\n    // if semitone is unrecognized, assume REST\r\n    if (tones[tone] === undefined || octaves[octave] === undefined || accidentals[accidental] === undefined) {\r\n      return -Infinity;\r\n    }\r\n\r\n    // return calculated index\r\n    return tones[tone] + octaves[octave] * 12 + accidentals[accidental];\r\n  }\r\n\r\n  static note(semitone = -Infinity) {\r\n    const octaves = [-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];\r\n    const tones = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'B'];\r\n\r\n    const octaveIndex = Math.floor(semitone / 12);\r\n    const toneIndex = Math.floor(semitone - octaveIndex * 12);\r\n\r\n    const octave = octaves[octaveIndex];\r\n    const tone = tones[toneIndex];\r\n\r\n    // by default assume REST\r\n    if (octave === undefined || tone === undefined) {\r\n      return 'REST';\r\n    }\r\n\r\n    // tone followed by octave followed by accidental\r\n    return tone.charAt(0) + octave.toString() + tone.charAt(1);\r\n  }\r\n\r\n  // converts semitone index to frequency in Hz\r\n  static frequency(semitone = -Infinity) {\r\n    // A4 is 440 Hz, 12 semitones per octave\r\n    return 440 * Math.pow(2, (semitone - 69) / 12);\r\n  }\r\n\r\n  constructor(numChannels = 1, sampleRate = 44100, bitsPerSample = 16, littleEndian = true, data = []) {\r\n    var bytesPerSample = bitsPerSample >>> 3;\r\n    // WAV header is always 44 bytes\r\n    this.header = new ArrayBuffer(44);\r\n    // flexible container for reading / writing raw bytes in header\r\n    this.view = new DataView(this.header);\r\n    // leave sound data as non typed array for more flexibility\r\n    this.data = data;\r\n\r\n    // initialize as non-configurable because it\r\n    // causes script to freeze when using parsed\r\n    // chunk sizes with wrong endianess assumed\r\n    Object.defineProperty(this, 'littleEndian', {\r\n      configurable: false,\r\n      enumerable: true,\r\n      value: littleEndian,\r\n      writable: false\r\n    });\r\n\r\n    // initial write index in data array\r\n    this.pointer = 0;\r\n\r\n    // WAV header properties\r\n    this.ChunkID = littleEndian ? 'RIFF' : 'RIFX';\r\n    this.ChunkSize = this.header.byteLength - 8;\r\n    this.Format = 'WAVE';\r\n    this.SubChunk1ID = 'fmt ';\r\n    this.SubChunk1Size = 16;\r\n    this.AudioFormat = 1;\r\n    this.NumChannels = numChannels;\r\n    this.SampleRate = sampleRate;\r\n    this.ByteRate = numChannels * sampleRate * bytesPerSample;\r\n    this.BlockAlign = numChannels * bytesPerSample;\r\n    this.BitsPerSample = bitsPerSample;\r\n    this.SubChunk2ID = 'data';\r\n    this.SubChunk2Size = data.length * bytesPerSample;\r\n  }\r\n\r\n  // internal setter for writing strings as raw bytes to header\r\n  setString(str, byteLength = str.length, byteOffset = 0) {\r\n    for (var i = 0; i < byteLength; i++) {\r\n      this.view.setUint8(byteOffset + i, str.charCodeAt(i));\r\n    }\r\n  }\r\n\r\n  // internal getter for reading raw bytes as strings from header\r\n  getString(byteLength, byteOffset = 0) {\r\n    for (var i = 0, str = ''; i < byteLength; i++) {\r\n      str += String.fromCharCode(this.view.getUint8(byteOffset + i));\r\n    }\r\n\r\n    return str;\r\n  }\r\n\r\n  // header property mutators\r\n\r\n  // 4 bytes at offset of 0 bytes\r\n  set ChunkID(str) {\r\n    this.setString(str, 4, 0);\r\n  }\r\n\r\n  get ChunkID() {\r\n    return this.getString(4, 0);\r\n  }\r\n\r\n  // 4 bytes at offset of 4 bytes\r\n  set ChunkSize(uint) {\r\n    this.view.setUint32(4, uint, this.littleEndian);\r\n  }\r\n\r\n  get ChunkSize() {\r\n    return this.view.getUint32(4, this.littleEndian);\r\n  }\r\n\r\n  // 4 bytes at offset of 8 bytes\r\n  set Format(str) {\r\n    this.setString(str, 4, 8);\r\n  }\r\n\r\n  get Format() {\r\n    return this.getString(4, 8);\r\n  }\r\n\r\n  // 4 bytes at offset of 12 bytes\r\n  set SubChunk1ID(str) {\r\n    this.setString(str, 4, 12);\r\n  }\r\n\r\n  get SubChunk1ID() {\r\n    return this.getString(4, 12);\r\n  }\r\n\r\n  // 4 bytes at offset of 16 bytes\r\n  set SubChunk1Size(uint) {\r\n    this.view.setUint32(16, uint, this.littleEndian);\r\n  }\r\n\r\n  get SubChunk1Size() {\r\n    return this.view.getUint32(16, this.littleEndian);\r\n  }\r\n\r\n  // 2 bytes at offset of 20 bytes\r\n  set AudioFormat(uint) {\r\n    this.view.setUint16(20, uint, this.littleEndian);\r\n  }\r\n\r\n  get AudioFormat() {\r\n    return this.view.getUint16(20, this.littleEndian);\r\n  }\r\n\r\n  // 2 bytes at offset of 22 bytes\r\n  set NumChannels(uint) {\r\n    this.view.setUint16(22, uint, this.littleEndian);\r\n  }\r\n\r\n  get NumChannels() {\r\n    return this.view.getUint16(22, this.littleEndian);\r\n  }\r\n\r\n  // 4 bytes at offset of 24 bytes\r\n  set SampleRate(uint) {\r\n    this.view.setUint32(24, uint, this.littleEndian);\r\n  }\r\n\r\n  get SampleRate() {\r\n    return this.view.getUint32(24, this.littleEndian);\r\n  }\r\n\r\n  // 4 bytes at offset of 28 bytes\r\n  set ByteRate(uint) {\r\n    this.view.setUint32(28, uint, this.littleEndian);\r\n  }\r\n\r\n  get ByteRate() {\r\n    return this.view.getUint32(28, this.littleEndian);\r\n  }\r\n\r\n  // 2 bytes at offset of 32 bytes\r\n  set BlockAlign(uint) {\r\n    this.view.setUint16(32, uint, this.littleEndian);\r\n  }\r\n\r\n  get BlockAlign() {\r\n    return this.view.getUint16(32, this.littleEndian);\r\n  }\r\n\r\n  // 2 bytes at offset of 34 bytes\r\n  set BitsPerSample(uint) {\r\n    this.view.setUint16(34, uint, this.littleEndian);\r\n  }\r\n\r\n  get BitsPerSample() {\r\n    return this.view.getUint16(34, this.littleEndian);\r\n  }\r\n\r\n  // 4 bytes at offset of 36 bytes\r\n  set SubChunk2ID(str) {\r\n    this.setString(str, 4, 36);\r\n  }\r\n\r\n  get SubChunk2ID() {\r\n    return this.getString(4, 36);\r\n  }\r\n\r\n  // 4 bytes at offset of 40 bytes\r\n  set SubChunk2Size(uint) {\r\n    this.view.setUint32(40, uint, this.littleEndian);\r\n  }\r\n\r\n  get SubChunk2Size() {\r\n    return this.view.getUint32(40, this.littleEndian);\r\n  }\r\n\r\n  // internal getter for sound data as\r\n  // typed array based on header properties\r\n  get typedData() {\r\n    var bytesPerSample = this.BitsPerSample >>> 3;\r\n    var data = this.data;\r\n    var size = this.SubChunk2Size;\r\n    var samples = size / bytesPerSample;\r\n    var buffer = new ArrayBuffer(size);\r\n    var uint8 = new Uint8Array(buffer);\r\n\r\n    // convert signed normalized sound data to typed integer data\r\n    // i.e. [-1, 1] -> [INT_MIN, INT_MAX]\r\n    var amplitude = Math.pow(2, (bytesPerSample << 3) - 1) - 1;\r\n    var i, d;\r\n\r\n    switch (bytesPerSample) {\r\n    case 1:\r\n      // endianess not relevant for 8-bit encoding\r\n      for (i = 0; i < samples; i++) {\r\n        // convert by adding 0x80 instead of 0x100\r\n        // WAV uses unsigned data for 8-bit encoding\r\n\r\n        // [INT8_MIN, INT8_MAX] -> [0, UINT8_MAX]\r\n        uint8[i] = (data[i] * amplitude + 0x80) & 0xFF;\r\n      }\r\n      break;\r\n    case 2:\r\n      // LSB first\r\n      if (this.littleEndian) {\r\n        for (i = 0; i < samples; i++) {\r\n          // [INT16_MIN, INT16_MAX] -> [0, UINT16_MAX]\r\n          d = (data[i] * amplitude + 0x10000) & 0xFFFF;\r\n\r\n          // unwrap inner loop\r\n          uint8[i * 2    ] = (d      ) & 0xFF;\r\n          uint8[i * 2 + 1] = (d >>> 8);\r\n        }\r\n      // MSB first\r\n      } else {\r\n        for (i = 0; i < samples; i++) {\r\n          // [INT16_MIN, INT16_MAX] -> [0, UINT16_MAX]\r\n          d = (data[i] * amplitude + 0x10000) & 0xFFFF;\r\n\r\n          // unwrap inner loop\r\n          uint8[i * 2    ] = (d >>> 8);\r\n          uint8[i * 2 + 1] = (d      ) & 0xFF;\r\n        }\r\n      }\r\n      break;\r\n    case 3:\r\n      // LSB first\r\n      if (this.littleEndian) {\r\n        for (i = 0; i < samples; i++) {\r\n          // [INT24_MIN, INT24_MAX] -> [0, UINT24_MAX]\r\n          d = (data[i] * amplitude + 0x1000000) & 0xFFFFFF;\r\n\r\n          // unwrap inner loop\r\n          uint8[i * 3    ] = (d       ) & 0xFF;\r\n          uint8[i * 3 + 1] = (d >>>  8) & 0xFF;\r\n          uint8[i * 3 + 2] = (d >>> 16);\r\n        }\r\n      // MSB first\r\n      } else {\r\n        for (i = 0; i < samples; i++) {\r\n          // [INT24_MIN, INT24_MAX] -> [0, UINT24_MAX]\r\n          d = (data[i] * amplitude + 0x1000000) & 0xFFFFFF;\r\n\r\n          // unwrap inner loop\r\n          uint8[i * 3    ] = (d >>> 16);\r\n          uint8[i * 3 + 1] = (d >>>  8) & 0xFF;\r\n          uint8[i * 3 + 2] = (d       ) & 0xFF;\r\n        }\r\n      }\r\n    case 4:\r\n      // LSB first\r\n      if (this.littleEndian) {\r\n        for (i = 0; i < samples; i++) {\r\n          // [INT32_MIN, INT32_MAX] -> [0, UINT32_MAX]\r\n          d = (data[i] * amplitude + 0x100000000) & 0xFFFFFFFF;\r\n\r\n          // unwrap inner loop\r\n          uint8[i * 4    ] = (d       ) & 0xFF;\r\n          uint8[i * 4 + 1] = (d >>>  8) & 0xFF;\r\n          uint8[i * 4 + 2] = (d >>> 16) & 0xFF;\r\n          uint8[i * 4 + 3] = (d >>> 24);\r\n        }\r\n      // MSB first\r\n      } else {\r\n        for (i = 0; i < samples; i++) {\r\n          // [INT32_MIN, INT32_MAX] -> [0, UINT32_MAX]\r\n          d = (data[i] * amplitude + 0x100000000) & 0xFFFFFFFF;\r\n\r\n          // unwrap inner loop\r\n          uint8[i * 4    ] = (d >>> 24);\r\n          uint8[i * 4 + 1] = (d >>> 16) & 0xFF;\r\n          uint8[i * 4 + 2] = (d >>>  8) & 0xFF;\r\n          uint8[i * 4 + 3] = (d       ) & 0xFF;\r\n        }\r\n      }\r\n    }\r\n\r\n    return buffer;\r\n  }\r\n\r\n  // binary container outputs\r\n\r\n  // browser-specific\r\n  // generates blob from concatenated typed arrays\r\n  toBlob() {\r\n    return new Blob([this.header, this.typedData], {type: 'audio/wav'});\r\n  }\r\n\r\n  // Node.js-specific\r\n  // generates buffer from concatenated typed arrays\r\n  toBuffer() {\r\n    return Buffer.concat([Buffer.from(this.header), Buffer.from(this.typedData)]);\r\n  }\r\n\r\n  // pointer mutators\r\n\r\n  // gets time (in seconds) of pointer\r\n  tell() {\r\n    return this.pointer / this.NumChannels / this.SampleRate;\r\n  }\r\n\r\n  // sets time (in seconds) of pointer\r\n  // zero-fills by default\r\n  seek(time, fill = true) {\r\n    var data   = this.data;\r\n    var sample = Math.round(this.SampleRate * time);\r\n\r\n    this.pointer = this.NumChannels * sample;\r\n\r\n    if (fill) {\r\n      // zero-fill seek\r\n      while (data.length < this.pointer) {\r\n        data[data.length] = 0;\r\n      }\r\n    } else {\r\n      this.pointer = data.length;\r\n    }\r\n  }\r\n\r\n  // sound data mutators\r\n\r\n  // writes the specified note to the sound data\r\n  // for amount of time in seconds\r\n  // at given normalized amplitude\r\n  // to channels listed (or all by default)\r\n  // adds to existing data by default\r\n  // and does not reset write index after operation by default\r\n  writeNote({note, time, amplitude = 1}, channels = [], blend = true, reset = false) {\r\n    // creating local references to properties\r\n    var data = this.data;\r\n    var numChannels = this.NumChannels;\r\n    var sampleRate = this.SampleRate;\r\n\r\n    // to prevent sound artifacts\r\n    const fadeSeconds = 0.001;\r\n\r\n    // calculating properties of given note\r\n    var semitone = WAV.semitone(note);\r\n    var frequency = WAV.frequency(semitone) * Math.PI * 2 / sampleRate;\r\n    var period = Math.PI * 2 / frequency;\r\n\r\n    // amount of blocks to be written\r\n    var blocksOut = Math.round(sampleRate * time);\r\n    // reduces sound artifacts by fading at last fadeSeconds\r\n    var nonZero = blocksOut - sampleRate * fadeSeconds;\r\n    // fade interval in samples\r\n    var fade = blocksOut - nonZero + 1;\r\n\r\n    // index of start and stop samples\r\n    var start = this.pointer;\r\n    var stop = data.length;\r\n\r\n    // determines amount of blocks to be updated\r\n    var blocksIn = Math.min(Math.floor((stop - start) / numChannels), blocksOut);\r\n\r\n    // i = index of each sample block\r\n    // j = index of each channel in a block\r\n    // k = cached index of data\r\n    // d = sample data value\r\n    var i, j, k, d;\r\n\r\n    // by default write to all channels\r\n    if (channels.length === 0) {\r\n      // don't overwrite passed array\r\n      channels = [];\r\n\r\n      for (i = 0; i < numChannels; i++) {\r\n        channels[i] = i;\r\n      }\r\n    }\r\n\r\n    // inline .indexOf() function calls into array references\r\n    var skipChannel = [];\r\n\r\n    for (i = 0; i < numChannels; i++) {\r\n      skipChannel[i] = (channels.indexOf(i) === -1);\r\n    }\r\n\r\n    // update existing data\r\n    for (i = 0; i < blocksIn; i++) {\r\n      // iterate through specified channels\r\n      for (j = 0; j < channels.length; j++) {\r\n        k = start + i * numChannels + channels[j];\r\n        d = 0;\r\n\r\n        if (frequency > 0) {\r\n          d = amplitude * Math.sin(frequency * i) * ((i < fade) ? i : (i > nonZero) ? blocksOut - i + 1 : fade) / fade;\r\n        }\r\n\r\n        data[k] = d + (blend ? data[k] : 0);\r\n      }\r\n    }\r\n\r\n    // append data\r\n    for (i = blocksIn; i < blocksOut; i++) {\r\n      k = start + i * numChannels;\r\n\r\n      // iterate through all channels\r\n      for (j = 0; j < numChannels; j++) {\r\n        d = 0;\r\n\r\n        // only write non-zero data to specified channels\r\n        if (frequency > 0 || !skipChannel[j]) {\r\n          d = amplitude * Math.sin(frequency * i) * ((i < fade) ? i : (i > nonZero) ? blocksOut - i + 1 : fade) / fade;\r\n        }\r\n\r\n        data[k + j] = d;\r\n      }\r\n    }\r\n\r\n    // update header properties\r\n    var end = Math.max(start + blocksOut * numChannels, stop) * this.BitsPerSample >>> 3;\r\n\r\n    this.ChunkSize = end + this.header.byteLength - 8;\r\n    this.SubChunk2Size = end;\r\n\r\n    if (!reset) {\r\n      // move write index to end of written data\r\n      this.pointer = start + blocksOut * numChannels;\r\n    }\r\n  }\r\n\r\n  // adds specified notes in series\r\n  // (or asynchronously if offset property is specified in a note)\r\n  // each playing for time * relativeDuration seconds\r\n  // followed by a time * (1 - relativeDuration) second rest\r\n  writeProgression(notes, amplitude = 1, channels = [], blend = true, reset = false, relativeDuration = 1) {\r\n    var start = this.pointer;\r\n\r\n    for (var i = 0, note, time, amp, off, secs, rest; i < notes.length; i++) {\r\n      ({note, time, amplitude: amp, offset: off} = notes[i]);\r\n\r\n      // for asynchronous progression\r\n      if (off !== undefined) {\r\n        this.seek(off);\r\n      }\r\n\r\n      if (relativeDuration === 1 || note === 'REST') {\r\n        this.writeNote({note, time, amplitude: amp === undefined ? amplitude : amp * amplitude}, channels, blend, false);\r\n      } else {\r\n        secs = time * relativeDuration;\r\n        rest = time - secs;\r\n\r\n        this.writeNote({note: note, time: secs, amplitude: amp === undefined ? amplitude : amp * amplitude}, channels, blend, false);\r\n        this.writeNote({note: 'REST', time: rest}, channels, blend, false);\r\n      }\r\n    }\r\n\r\n    if (reset) {\r\n      this.pointer = start;\r\n    }\r\n  }\r\n};\r\n\r\nmodule.exports = WAV;\r\n"]}


--------------------------------------------------------------------------------
/gulp/config.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "paths": {
 3 |     "entry": "./index.js",
 4 |     "dest": "./dst"
 5 |   },
 6 |   "names": {
 7 |     "app": "synth.min.js",
 8 |     "glob": "synth"
 9 |   }
10 | }
11 | 


--------------------------------------------------------------------------------
/gulp/tasks/browserify.js:
--------------------------------------------------------------------------------
 1 | const config = require('../config');
 2 | 
 3 | const gulp = require('gulp');
 4 | const browserify = require('browserify');
 5 | const babelify = require('babelify');
 6 | const source = require('vinyl-source-stream');
 7 | const buffer = require('vinyl-buffer');
 8 | const uglify = require('gulp-uglify');
 9 | const sourcemaps = require('gulp-sourcemaps');
10 | const gutil = require('gulp-util');
11 | 
12 | gulp.task('browserify', function () {
13 |   // set up the browserify instance on a task basis
14 |   let b = browserify({
15 |     entries: config.paths.entry,
16 |     debug: true,
17 |     standalone: config.names.glob,
18 |     transform: [
19 |       babelify.configure({
20 |         presets: ['es2015'],
21 |         sourceMapsAbsolute: true,
22 |       }),
23 |     ],
24 |   });
25 | 
26 |   return b.bundle()
27 |     .pipe(source(config.names.app))
28 |     .pipe(buffer())
29 |     .pipe(sourcemaps.init({loadMaps: true}))
30 |       // Add transformation tasks to the pipeline here.
31 |       .pipe(uglify())
32 |       .on('error', gutil.log)
33 |     .pipe(sourcemaps.write('./'))
34 |     .pipe(gulp.dest(config.paths.dest));
35 | });
36 | 


--------------------------------------------------------------------------------
/gulp/tasks/default.js:
--------------------------------------------------------------------------------
1 | const gulp = require('gulp');
2 | 
3 | gulp.task('default', ['browserify']);
4 | 


--------------------------------------------------------------------------------
/gulpfile.js:
--------------------------------------------------------------------------------
1 | // Module to require whole directories
2 | const requireDir = require('require-dir');
3 | 
4 | // Pulling in all tasks from the tasks folder
5 | requireDir('./gulp/tasks', { recurse: true });
6 | 


--------------------------------------------------------------------------------
/index.js:
--------------------------------------------------------------------------------
1 | 'use strict';
2 | 
3 | module.exports = {
4 |   WAV: require('./src/wav'),
5 |   MIDIStream: require('./src/midi'),
6 |   midiToWav: require('./src/midi2wav')
7 | };
8 | 


--------------------------------------------------------------------------------
/man/help.txt:
--------------------------------------------------------------------------------
 1 | NAME
 2 |   synth - JavaScript MIDI-to-WAV synthesizer
 3 | 
 4 | SYNOPSIS
 5 |   synth -i filename [options]
 6 | 
 7 | DESCRIPTION
 8 |   Parses MIDI file and synthesizes sinusoidal raw audio in WAV format.
 9 | 
10 | OPTIONS
11 |   -i, --input filename
12 |     [Required] Specify path of MIDI file (without extension) as input
13 | 
14 |   -o, --output filename
15 |     Specify path of WAV file (without extension) as output
16 |     Default to input
17 | 
18 |   -s, --sample-rate number
19 |     Specify explicitly the sample rate in Hz of WAV output.
20 |     Default 44100
21 | 
22 |   -b, --bits-per-sample number
23 |     Specify explicitly the bits per sample of WAV output.
24 |     Default 16
25 | 
26 |   -d, --duration number
27 |     Specify explicitly the relative note duration before rest.
28 |     Default 1
29 | 
30 |   -S, --skip json|file
31 |     Specify either JSON literal or path of JSON file containing meta events or
32 |       source file with which to match and omit MIDI tracks from WAV output. If
33 |       source file is specified, imports function that accepts a track and
34 |       returns a boolean specifying whether to skip or not.
35 |     Default []
36 | 
37 |     Example Usage:
38 |       synth -i file -S [{\"text\":\"Drums\"},{\"text\":\"Timpani\"}]
39 |       synth -i file -S skip.json
40 | 
41 |       skip.json:
42 | 
43 |       [
44 |         {
45 |           "text": "Drums"
46 |         },
47 |         {
48 |           "text": "Timpani"
49 |         }
50 |       ]
51 | 
52 |       synth -i file -S skip.js
53 | 
54 |       skip.js:
55 | 
56 |       module.exports = function (track) {
57 |         // ...logic for determining whether to skip
58 |         return skip;
59 |       };
60 | 
61 |   -v, --verbose
62 |     Verbose output
63 | 
64 |   -D, --dry-run
65 |     Run verbosely without generating WAV file
66 | 
67 |   -h, --help
68 |     Display the help page
69 | 
70 | AUTHOR
71 |   Patrick Roberts
72 | 
73 | COPYRIGHT
74 |   Synth is available under the MIT License.
75 | 


--------------------------------------------------------------------------------
/man/synth.1:
--------------------------------------------------------------------------------
 1 | .TH SYNTH 1
 2 | .SH NAME
 3 | \fIsynth\fR \- JavaScript MIDI\-to\-WAV synthesizer
 4 | .SH SYNOPSIS
 5 | .B synth
 6 | \-i
 7 | .BR filename
 8 | [options]
 9 | .SH DESCRIPTION
10 | .B \fIsynth\fR
11 | parses MIDI file and synthesizes sinusoidal raw audio in WAV format.
12 | .SH OPTIONS
13 | .TP
14 | .BR \-i ", " \-\-input " " \fIfilename\fR
15 | [Required] Specify path of MIDI file (without extension) as input
16 | .TP
17 | .BR \-o ", " \-\-output " " \fIfilename\fR
18 | Specify path of WAV file (without extension) as output
19 | .PP
20 | .RS
21 | Default to \fIinput\fR
22 | .RE
23 | .TP
24 | .BR \-s ", " \-\-sample\-rate " " \fInumber\fR
25 | Specify explicitly the sample rate in Hz of WAV output.
26 | .PP
27 | .RS
28 | Default 44100
29 | .RE
30 | .TP
31 | .BR \-b ", " \-\-bits\-per\-sample " " \fInumber\fR
32 | Specify explicitly the bits per sample of WAV output.
33 | .PP
34 | .RS
35 | Default 16
36 | .RE
37 | .TP
38 | .BR \-d ", " \-\-duration " " \fInumber\fR
39 | Specify explicitly the relative note duration before rest.
40 | .PP
41 | .RS
42 | Default 1
43 | .RE
44 | .TP
45 | .BR \-S ", " \-\-skip " " \fIjson\fR|\fIfile\fR
46 | Specify either JSON literal or path of JSON file containing meta events or
47 | source file with which to match and omit MIDI tracks from WAV output. If
48 | source file is specified, imports function that accepts a track and
49 | returns a boolean specifying whether to skip or not.
50 | .PP
51 | .RS
52 | Default []
53 | .RE
54 | .TP
55 | .BR \-v ", " \-\-verbose
56 | Verbose output
57 | .TP
58 | .BR \-D ", " \-\-dry\-run
59 | Run verbosely without generating WAV file
60 | .TP
61 | .BR \-h ", " \-\-help
62 | Display the help page
63 | .SH AUTHOR
64 | Patrick Roberts
65 | .SH COPYRIGHT
66 | .B \fIsynth\fR is available under the MIT License.
67 | 


--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "synth-js",
 3 |   "version": "0.1.2",
 4 |   "description": "high performance MIDI parser and WAV encoder",
 5 |   "main": "index.js",
 6 |   "bin": {
 7 |     "synth": "./bin/synth.js"
 8 |   },
 9 |   "man": "./man/synth.1",
10 |   "repository": {
11 |     "type": "git",
12 |     "url": "https://github.com/patrickroberts/synth-js.git"
13 |   },
14 |   "engines": {
15 |     "node": ">=6.9.2",
16 |     "npm": "^4.0.0"
17 |   },
18 |   "scripts": {
19 |     "prepublishOnly": "gulp"
20 |   },
21 |   "keywords": [
22 |     "wav",
23 |     "midi",
24 |     "riff",
25 |     "audio",
26 |     "music"
27 |   ],
28 |   "author": "Patrick Roberts",
29 |   "license": "MIT",
30 |   "dependencies": {},
31 |   "devDependencies": {
32 |     "babel-preset-es2015": "^6.24.1",
33 |     "babelify": "^7.3.0",
34 |     "browserify": "^14.3.0",
35 |     "gulp": "^3.9.1",
36 |     "gulp-sourcemaps": "^2.6.0",
37 |     "gulp-uglify": "^2.1.2",
38 |     "gulp-util": "^3.0.8",
39 |     "require-dir": "^0.3.1",
40 |     "vinyl-buffer": "^1.0.0",
41 |     "vinyl-source-stream": "^1.1.0"
42 |   }
43 | }
44 | 


--------------------------------------------------------------------------------
/src/midi.js:
--------------------------------------------------------------------------------
  1 | 'use strict';
  2 | 
  3 | class MIDIStream {
  4 |   constructor(buffer) {
  5 |     this.data = new Uint8Array(buffer);
  6 |     this.byteOffset = 0;
  7 |     this.lastEventTypeByte = 0x00;
  8 |   }
  9 | 
 10 |   readString(byteLength) {
 11 |     var byteOffset = this.byteOffset;
 12 | 
 13 |     for (var i = 0, str = ''; i < byteLength; i++) {
 14 |       str += String.fromCharCode(this.data[byteOffset + i]);
 15 |     }
 16 | 
 17 |     this.byteOffset += byteLength;
 18 | 
 19 |     return str;
 20 |   }
 21 | 
 22 |   readUint32() {
 23 |     var byteOffset = this.byteOffset;
 24 |     var value = (
 25 |       (this.data[byteOffset    ] << 24) |
 26 |       (this.data[byteOffset + 1] << 16) |
 27 |       (this.data[byteOffset + 2] <<  8) |
 28 |       (this.data[byteOffset + 3]      )
 29 |     );
 30 | 
 31 |     this.byteOffset += 4;
 32 | 
 33 |     return value;
 34 |   }
 35 | 
 36 |   readUint24() {
 37 |     var byteOffset = this.byteOffset;
 38 |     var value = (
 39 |       (this.data[byteOffset    ] << 16) |
 40 |       (this.data[byteOffset + 1] <<  8) |
 41 |       (this.data[byteOffset + 2]      )
 42 |     );
 43 | 
 44 |     this.byteOffset += 3;
 45 | 
 46 |     return value;
 47 |   }
 48 | 
 49 |   readUint16() {
 50 |     var byteOffset = this.byteOffset;
 51 |     var value = (
 52 |       (this.data[byteOffset    ] << 8) |
 53 |       (this.data[byteOffset + 1]     )
 54 |     );
 55 | 
 56 |     this.byteOffset += 2;
 57 | 
 58 |     return value;
 59 |   }
 60 | 
 61 |   readUint8() {
 62 |     var byteOffset = this.byteOffset;
 63 |     var value = this.data[byteOffset];
 64 | 
 65 |     this.byteOffset += 1;
 66 | 
 67 |     return value;
 68 |   }
 69 | 
 70 |   readInt8() {
 71 |     var byteOffset = this.byteOffset;
 72 |     var value = this.data[byteOffset];
 73 | 
 74 |     if (value & 0x80 === 0x80) {
 75 |       value ^= 0xFFFFFF00;
 76 |     }
 77 | 
 78 |     this.byteOffset += 1;
 79 | 
 80 |     return value;
 81 |   }
 82 | 
 83 |   readVarUint() {
 84 |     var value = 0;
 85 |     var uint8;
 86 | 
 87 |     do {
 88 |       uint8 = this.readUint8();
 89 |       value = (value << 7) + (uint8 & 0x7F);
 90 |     } while ((uint8 & 0x80) === 0x80);
 91 | 
 92 |     return value;
 93 |   }
 94 | 
 95 |   skip(byteLength) {
 96 |     this.byteOffset += byteLength;
 97 |   }
 98 | 
 99 |   readChunk() {
100 |     var id = this.readString(4);
101 |     var length = this.readUint32();
102 |     var byteOffset = this.byteOffset;
103 | 
104 |     this.byteOffset += length;
105 | 
106 |     var data = this.data.slice(byteOffset, this.byteOffset);
107 | 
108 |     return {
109 |       id: id,
110 |       length: length,
111 |       data: data.buffer
112 |     };
113 |   }
114 | 
115 |   readEvent() {
116 |     var event = {};
117 | 
118 |     event.delta = this.readVarUint();
119 | 
120 |     var eventTypeByte = this.readUint8();
121 | 
122 |     // system event
123 |     if ((eventTypeByte & 0xF0) === 0xF0) {
124 |       switch (eventTypeByte) {
125 |       // meta event
126 |       case 0xFF:
127 |         event.type = 'meta';
128 | 
129 |         var subTypeByte = this.readUint8();
130 |         var length = this.readVarUint();
131 | 
132 |         switch (subTypeByte) {
133 |         case 0x00:
134 |           event.subType = 'sequenceNumber';
135 |           if (length === 2)
136 |             event.value = this.readUint16();
137 |           else
138 |             this.skip(length);
139 |           break;
140 |         case 0x01:
141 |           event.subType = 'text';
142 |           event.value = this.readString(length);
143 |           break;
144 |         case 0x02:
145 |           event.subType = 'copyrightNotice';
146 |           event.value = this.readString(length);
147 |           break;
148 |         case 0x03:
149 |           event.subType = 'trackName';
150 |           event.value = this.readString(length);
151 |           break;
152 |         case 0x04:
153 |           event.subType = 'instrumentName';
154 |           event.value = this.readString(length);
155 |           break;
156 |         case 0x05:
157 |           event.subType = 'lyrics';
158 |           event.value = this.readString(length);
159 |           break;
160 |         case 0x06:
161 |           event.subType = 'marker';
162 |           event.value = this.readString(length);
163 |           break;
164 |         case 0x07:
165 |           event.subType = 'cuePoint';
166 |           event.value = this.readString(length);
167 |           break;
168 |         case 0x20:
169 |           event.subType = 'midiChannelPrefix';
170 |           if (length === 1)
171 |             event.value = this.readUint8();
172 |           else
173 |             this.skip(length);
174 |           break;
175 |         case 0x2F:
176 |           event.subType = 'endOfTrack';
177 |           if (length > 0)
178 |             this.skip(length);
179 |           break;
180 |         case 0x51:
181 |           event.subType = 'setTempo';
182 |           if (length === 3)
183 |             event.value = this.readUint24();
184 |           else
185 |             this.skip(length)
186 |           break;
187 |         case 0x54:
188 |           event.subType = 'smpteOffset';
189 |           if (length === 5) {
190 |             var hourByte = this.readUint8();
191 |             event.value = {
192 |               frameRate: ({
193 |                 0x00: 24,
194 |                 0x01: 25,
195 |                 0x02: 29.97,
196 |                 0x03: 30
197 |               }[hourByte >>> 6]),
198 |               hour: (hourByte & 0x3F),
199 |               minute: this.readUint8(),
200 |               second: this.readUint8(),
201 |               frame: this.readUint8(),
202 |               subFrame: this.readUint8()
203 |             };
204 |           } else {
205 |             this.skip(length);
206 |           }
207 |           break;
208 |         case 0x58:
209 |           event.subType = 'timeSignature';
210 |           if (length === 4) {
211 |             event.value = {
212 |               numerator: this.readUint8(),
213 |               denominator: 1 << this.readUint8(),
214 |               metronome: this.readUint8(),
215 |               thirtyseconds: this.readUint8()
216 |             };
217 |           } else {
218 |             this.skip(length);
219 |           }
220 |           break;
221 |         case 0x59:
222 |           event.subType = 'keySignature';
223 |           if (length === 2) {
224 |             event.value = {
225 |               key: this.readInt8(),
226 |               scale: this.readUint8()
227 |             };
228 |           } else {
229 |             this.skip(length);
230 |           }
231 |           break;
232 |         case 0x7F:
233 |           event.subType = 'sequencerSpecific';
234 |           event.value = this.readString(length);
235 |           break;
236 |         default:
237 |           event.subType = 'unknown';
238 |           event.value = this.readString(length);
239 |         }
240 |         break;
241 |       // sysex event
242 |       case 0xF0:
243 |         event.type = 'sysEx';
244 | 
245 |         var length = this.readVarUint();
246 | 
247 |         event.value = this.readString(length);
248 | 
249 |         break;
250 |       case 0xF7:
251 |         event.type = 'dividedSysEx';
252 | 
253 |         var length = this.readVarUint();
254 | 
255 |         event.value = this.readString(length);
256 | 
257 |         break;
258 |       default:
259 |         event.type = 'unknown';
260 | 
261 |         var length = this.readVarUint();
262 | 
263 |         event.value = this.readString(length);
264 |       }
265 |     // channel event
266 |     } else {
267 |       var param;
268 | 
269 |       // if the high bit is low
270 |       // use running event type mode
271 |       if ((eventTypeByte & 0x80) === 0x00) {
272 |         param = eventTypeByte;
273 |         eventTypeByte = this.lastEventTypeByte;
274 |       } else {
275 |         param = this.readUint8();
276 |         this.lastEventTypeByte = eventTypeByte;
277 |       }
278 | 
279 |       var eventType = eventTypeByte >> 4;
280 | 
281 |       event.channel = eventTypeByte & 0x0F;
282 |       event.type = 'channel';
283 | 
284 |       switch (eventType) {
285 |       case 0x08:
286 |         event.subType = 'noteOff';
287 | 
288 |         event.value = {
289 |           noteNumber: param,
290 |           velocity: this.readUint8()
291 |         };
292 |         break;
293 |       case 0x09:
294 |         event.value = {
295 |           noteNumber: param,
296 |           velocity: this.readUint8()
297 |         };
298 | 
299 |         // some midi implementations use a noteOn
300 |         // event with 0 velocity to denote noteOff
301 |         if (event.value.velocity === 0) {
302 |           event.subType = 'noteOff';
303 |         } else {
304 |           event.subType = 'noteOn';
305 |         }
306 |         break;
307 |       case 0x0A:
308 |         event.subType = 'noteAftertouch';
309 | 
310 |         event.value = {
311 |           noteNumber: param,
312 |           amount: this.readUint8()
313 |         };
314 |         break;
315 |       case 0x0B:
316 |         event.subType = 'controller';
317 | 
318 |         event.value = {
319 |           controllerNumber: param,
320 |           controllerValue: this.readUint8()
321 |         };
322 |         break;
323 |       case 0x0C:
324 |         event.subType = 'programChange';
325 |         event.value = param;
326 |         break;
327 |       case 0x0D:
328 |         event.subType = 'channelAftertouch';
329 |         event.value = param;
330 |         break;
331 |       case 0x0E:
332 |         event.subType = 'pitchBend';
333 |         event.value = param + (this.readUint8() << 7);
334 |         break;
335 |       default:
336 |         event.subType = 'unknown';
337 |         event.value = (param << 8) + this.readUint8();
338 |       }
339 |     }
340 | 
341 |     return event;
342 |   }
343 | };
344 | 
345 | module.exports = MIDIStream;
346 | 


--------------------------------------------------------------------------------
/src/midi2wav.js:
--------------------------------------------------------------------------------
  1 | 'use strict';
  2 | 
  3 | const WAV = require('./wav');
  4 | const MIDIStream = require('./midi');
  5 | const Timer = require('./utils/timer');
  6 | 
  7 | module.exports = function midiToWav(buffer, args = {}) {
  8 |   if (args.verbose) {
  9 |     console.log('parsing MIDI header...');
 10 |   }
 11 | 
 12 |   const midiStream = new MIDIStream(buffer);
 13 |   const header = midiStream.readChunk();
 14 | 
 15 |   if (header.id !== 'MThd' || header.length !== 6) {
 16 |     throw new SyntaxError('malformed header');
 17 |   }
 18 | 
 19 |   const headerStream = new MIDIStream(header.data);
 20 |   const formatType = headerStream.readUint16();
 21 |   const trackCount = headerStream.readUint16();
 22 |   const timeDivision = headerStream.readUint16();
 23 |   const tracks = [];
 24 |   const progression = [];
 25 |   const events = [];
 26 |   let maxAmplitude;
 27 | 
 28 |   for (let i = 0; i < trackCount; i++) {
 29 |     if (args.verbose) {
 30 |       console.log(`parsing track ${i + 1}...`);
 31 |     }
 32 | 
 33 |     const trackChunk = midiStream.readChunk();
 34 | 
 35 |     if (trackChunk.id !== 'MTrk') {
 36 |       continue;
 37 |     }
 38 | 
 39 |     const trackStream = new MIDIStream(trackChunk.data);
 40 |     const track = [];
 41 |     let keep = true;
 42 | 
 43 |     // determine whether applied filter will remove the current track while populating it
 44 |     while (keep && trackStream.byteOffset < trackChunk.length) {
 45 |       let event = trackStream.readEvent();
 46 |       track.push(event);
 47 | 
 48 |       if (typeof event.value === 'string') {
 49 |         if (args.verbose) {
 50 |           console.log(`{"${event.subType}":"${event.value}"}`);
 51 |         }
 52 | 
 53 |         if (Array.isArray(args.Skip)) {
 54 |           for (let t = 0; t < args.Skip.length; t++) {
 55 |             if (args.Skip[t][event.subType] === event.value) {
 56 |               if (args.verbose) {
 57 |                 console.log(`skip match found: {"${event.subType}":"${event.value}"}`);
 58 |               }
 59 | 
 60 |               keep = false;
 61 |               break;
 62 |             }
 63 |           }
 64 |         }
 65 |       }
 66 |     }
 67 | 
 68 |     if (typeof args.Skip === 'function') {
 69 |       keep = !args.Skip(track);
 70 |     }
 71 | 
 72 |     if (keep) {
 73 |       tracks.push(track);
 74 |     } else if (args.verbose) {
 75 |       console.log(`skipping track ${i + 1}...`);
 76 |     }
 77 |   }
 78 | 
 79 |   if (timeDivision >>> 15 === 0) {
 80 |     // use microseconds per beat
 81 |     const timer = new Timer(timeDivision);
 82 | 
 83 |     if (args.verbose) {
 84 |       console.log('initializing timer...');
 85 |     }
 86 | 
 87 |     // set up timer with setTempo events
 88 |     for (let i = 0, delta = 0, ticks = 0, event; i < tracks[0].length; i++) {
 89 |       event = tracks[0][i];
 90 |       delta += event.delta;
 91 |       ticks += event.delta;
 92 | 
 93 |       if (event.subType === 'setTempo') {
 94 |         timer.addCriticalPoint(delta, event.value);
 95 |         delta = 0;
 96 |       }
 97 |     }
 98 | 
 99 |     // generate note data
100 |     for (let i = 0; i < tracks.length; i++) {
101 |       if (args.verbose) {
102 |         console.log(`generating progression from track ${i + 1}...`);
103 |       }
104 | 
105 |       let track = tracks[i];
106 |       let delta = 0;
107 |       let map = new Map();
108 | 
109 |       for (let j = 0; j < track.length; j++) {
110 |         let event = track[j];
111 |         delta += event.delta;
112 | 
113 |         if (event.type === 'channel') {
114 |           const semitone = event.value.noteNumber;
115 | 
116 |           if (event.subType === 'noteOn') {
117 |             let velocity = event.value.velocity;
118 |             let offset = timer.getTime(delta);
119 | 
120 |             // use stack for simultaneous identical notes
121 |             if (map.has(semitone)) {
122 |               map.get(semitone).push({offset, velocity});
123 |             } else {
124 |               map.set(semitone, [{offset, velocity}]);
125 |             }
126 | 
127 |             // to determine maximum total velocity for normalizing volume
128 |             events.push({velocity, delta, note: true});
129 |           } else if (event.subType === 'noteOff') {
130 |             const notes = map.get(semitone);
131 | 	          const note = notes ? notes.pop() : { offset: 0, velocity: 0 };
132 | 
133 |             progression.push({
134 |               note: WAV.note(semitone),
135 |               time: timer.getTime(delta) - note.offset,
136 |               amplitude: note.velocity / 128,
137 |               offset: note.offset,
138 |             });
139 | 
140 |             // to determine maximum total velocity for normalizing volume
141 |             events.push({velocity: note.velocity, delta, note: false});
142 |           }
143 |         } else if (args.verbose && event.type === 'meta') {
144 |           if (typeof event.value === 'string') {
145 |             console.log(`${timer.getTime(delta).toFixed(2)}s ${event.subType}: ${event.value}`);
146 |           }
147 |         }
148 |       }
149 |     }
150 | 
151 |     if (args.verbose) {
152 |       console.log('normalizing volume...');
153 |     }
154 | 
155 |     events.sort(function (a, b) {
156 |       return a.delta - b.delta || a.note - b.note;
157 |     });
158 | 
159 |     if (args.verbose) {
160 |       console.log('total notes:', progression.length);
161 |       console.log('total time:', timer.getTime(events[events.length - 1].delta), 'seconds');
162 |     }
163 | 
164 |     let maxVelocity = 1;
165 |     let maxVelocityTime = 0;
166 |     let velocity = 1;
167 |     let maxChord = 0;
168 |     let maxChordTime = 0;
169 |     let chord = 0;
170 | 
171 |     for (const event of events) {
172 |       if (event.note) {
173 |         velocity += event.velocity;
174 |         chord++;
175 | 
176 |         if (velocity > maxVelocity) {
177 |           maxVelocity = velocity;
178 |           maxVelocityTime = timer.getTime(event.delta);
179 |         }
180 | 
181 |         if (chord > maxChord) {
182 |           maxChord = chord;
183 |           maxChordTime = timer.getTime(event.delta);
184 |         }
185 |       } else {
186 |         velocity -= event.velocity;
187 |         chord--;
188 |       }
189 |     }
190 | 
191 |     // scaling factor for amplitude
192 |     maxAmplitude = 128 / maxVelocity;
193 | 
194 |     if (args.verbose) {
195 |       console.log('setting volume to', maxAmplitude);
196 |       console.log('  maximum chord of', maxChord, 'at', maxChordTime, 'seconds');
197 |       console.log('  maximum velocity of', maxVelocity - 1, 'at', maxVelocityTime, 'seconds');
198 |     }
199 |   } else {
200 |     // use frames per second
201 |     // not yet implemented
202 | 
203 |     console.log('Detected unsupported MIDI timing mode');
204 | 
205 |     return null;
206 | 
207 |     /*
208 |     let framesPerSecond = (division >>> 8) & 0x7F;
209 |     let ticksPerFrame = division & 0xFF;
210 | 
211 |     if (framesPerSecond === 29) {
212 |       framesPerSecond = 29.97;
213 |     }
214 | 
215 |     // seconds per tick = 1 / frames per second / ticks per frame
216 |     secsPerTick = 1 / framesPerSecond / ticksPerFrame;
217 |     */
218 |   }
219 | 
220 |   // set to mono
221 |   args.channels = 1;
222 | 
223 |   if (args.verbose) {
224 |     console.log('generating WAV buffer...');
225 |   }
226 | 
227 |   const wav = new WAV(args.channels, args.sampleRate, args.bitsPerSample);
228 | 
229 |   wav.writeProgression(progression, maxAmplitude, [0], true, true, args.duration);
230 | 
231 |   return wav;
232 | };
233 | 


--------------------------------------------------------------------------------
/src/utils/timer.js:
--------------------------------------------------------------------------------
 1 | 'use strict';
 2 | 
 3 | // utility class to calculate time from delta ticks
 4 | // when MIDI file has several `setTempo` events
 5 | class Timer {
 6 |   constructor(ticksPerBeat) {
 7 |     this.ticksPerBeat = ticksPerBeat;
 8 |     this.criticalPoints = [];
 9 |   }
10 | 
11 |   // delta represents ticks since last time change
12 |   addCriticalPoint(delta, microsecondsPerBeat) {
13 |     this.criticalPoints.push({
14 |       delta,
15 |       microsecondsPerBeat
16 |     });
17 |   }
18 | 
19 |   getTime(delta) {
20 |     const microsecondsPerSecond = 1000000;
21 |     let time = 0;
22 |     // midi standard initializes file with this value
23 |     let microsecondsPerBeat = 500000;
24 | 
25 |     // iterate through time changes while decrementing delta ticks to 0
26 |     for (let i = 0, criticalPoint; i < this.criticalPoints.length && delta > 0; i++) {
27 |       criticalPoint = this.criticalPoints[i];
28 | 
29 |       // incrementally calculate the time passed for each range of timing
30 |       if (delta >= criticalPoint.delta) {
31 |         time += criticalPoint.delta * microsecondsPerBeat / this.ticksPerBeat / microsecondsPerSecond;
32 |         delta -= criticalPoint.delta;
33 |       } else {
34 |         time += delta * microsecondsPerBeat / this.ticksPerBeat / microsecondsPerSecond;
35 |         delta = 0;
36 |       }
37 | 
38 |       microsecondsPerBeat = criticalPoint.microsecondsPerBeat;
39 |     }
40 | 
41 |     time += delta * microsecondsPerBeat / this.ticksPerBeat / microsecondsPerSecond;
42 | 
43 |     return time;
44 |   }
45 | };
46 | 
47 | module.exports = Timer;
48 | 


--------------------------------------------------------------------------------
/src/wav.js:
--------------------------------------------------------------------------------
  1 | 'use strict';
  2 | 
  3 | class WAV {
  4 |   static semitone(note = 'REST') {
  5 |     // matches occurence of A through G
  6 |     // followed by positive or negative integer
  7 |     // followed by 0 to 2 occurences of flat or sharp
  8 |     const re = /^([A-G])(\-?\d+)(b{0,2}|#{0,2})$/;
  9 | 
 10 |     // if semitone is unrecognized, assume REST
 11 |     if (!re.test(note)) {
 12 |       return -Infinity;
 13 |     }
 14 | 
 15 |     // parse substrings of note
 16 |     const [, tone, octave, accidental] = note.match(re);
 17 | 
 18 |     // semitone indexed relative to A4 == 69 for compatibility with MIDI
 19 |     const tones = {C: 0, D: 2, E: 4, F: 5, G: 7, A: 9, B: 11};
 20 |     const octaves = {'-1': 0, 0: 1, 1: 2, 2: 3, 3: 4, 4: 5, 5: 6, 6: 7, 7: 8, 8: 9, 9: 10, 10: 11};
 21 |     const accidentals = {bb: -2, b: -1, '': 0, '#': 1, '##': 2};
 22 | 
 23 |     // if semitone is unrecognized, assume REST
 24 |     if (tones[tone] === undefined || octaves[octave] === undefined || accidentals[accidental] === undefined) {
 25 |       return -Infinity;
 26 |     }
 27 | 
 28 |     // return calculated index
 29 |     return tones[tone] + octaves[octave] * 12 + accidentals[accidental];
 30 |   }
 31 | 
 32 |   static note(semitone = -Infinity) {
 33 |     const octaves = [-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
 34 |     const tones = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'B'];
 35 | 
 36 |     const octaveIndex = Math.floor(semitone / 12);
 37 |     const toneIndex = Math.floor(semitone - octaveIndex * 12);
 38 | 
 39 |     const octave = octaves[octaveIndex];
 40 |     const tone = tones[toneIndex];
 41 | 
 42 |     // by default assume REST
 43 |     if (octave === undefined || tone === undefined) {
 44 |       return 'REST';
 45 |     }
 46 | 
 47 |     // tone followed by octave followed by accidental
 48 |     return tone.charAt(0) + octave.toString() + tone.charAt(1);
 49 |   }
 50 | 
 51 |   // converts semitone index to frequency in Hz
 52 |   static frequency(semitone = -Infinity) {
 53 |     // A4 is 440 Hz, 12 semitones per octave
 54 |     return 440 * Math.pow(2, (semitone - 69) / 12);
 55 |   }
 56 | 
 57 |   constructor(numChannels = 1, sampleRate = 44100, bitsPerSample = 16, littleEndian = true, data = []) {
 58 |     var bytesPerSample = bitsPerSample >>> 3;
 59 |     // WAV header is always 44 bytes
 60 |     this.header = new ArrayBuffer(44);
 61 |     // flexible container for reading / writing raw bytes in header
 62 |     this.view = new DataView(this.header);
 63 |     // leave sound data as non typed array for more flexibility
 64 |     this.data = data;
 65 | 
 66 |     // initialize as non-configurable because it
 67 |     // causes script to freeze when using parsed
 68 |     // chunk sizes with wrong endianess assumed
 69 |     Object.defineProperty(this, 'littleEndian', {
 70 |       configurable: false,
 71 |       enumerable: true,
 72 |       value: littleEndian,
 73 |       writable: false
 74 |     });
 75 | 
 76 |     // initial write index in data array
 77 |     this.pointer = 0;
 78 | 
 79 |     // WAV header properties
 80 |     this.ChunkID = littleEndian ? 'RIFF' : 'RIFX';
 81 |     this.ChunkSize = this.header.byteLength - 8;
 82 |     this.Format = 'WAVE';
 83 |     this.SubChunk1ID = 'fmt ';
 84 |     this.SubChunk1Size = 16;
 85 |     this.AudioFormat = 1;
 86 |     this.NumChannels = numChannels;
 87 |     this.SampleRate = sampleRate;
 88 |     this.ByteRate = numChannels * sampleRate * bytesPerSample;
 89 |     this.BlockAlign = numChannels * bytesPerSample;
 90 |     this.BitsPerSample = bitsPerSample;
 91 |     this.SubChunk2ID = 'data';
 92 |     this.SubChunk2Size = data.length * bytesPerSample;
 93 |   }
 94 | 
 95 |   // internal setter for writing strings as raw bytes to header
 96 |   setString(str, byteLength = str.length, byteOffset = 0) {
 97 |     for (var i = 0; i < byteLength; i++) {
 98 |       this.view.setUint8(byteOffset + i, str.charCodeAt(i));
 99 |     }
100 |   }
101 | 
102 |   // internal getter for reading raw bytes as strings from header
103 |   getString(byteLength, byteOffset = 0) {
104 |     for (var i = 0, str = ''; i < byteLength; i++) {
105 |       str += String.fromCharCode(this.view.getUint8(byteOffset + i));
106 |     }
107 | 
108 |     return str;
109 |   }
110 | 
111 |   // header property mutators
112 | 
113 |   // 4 bytes at offset of 0 bytes
114 |   set ChunkID(str) {
115 |     this.setString(str, 4, 0);
116 |   }
117 | 
118 |   get ChunkID() {
119 |     return this.getString(4, 0);
120 |   }
121 | 
122 |   // 4 bytes at offset of 4 bytes
123 |   set ChunkSize(uint) {
124 |     this.view.setUint32(4, uint, this.littleEndian);
125 |   }
126 | 
127 |   get ChunkSize() {
128 |     return this.view.getUint32(4, this.littleEndian);
129 |   }
130 | 
131 |   // 4 bytes at offset of 8 bytes
132 |   set Format(str) {
133 |     this.setString(str, 4, 8);
134 |   }
135 | 
136 |   get Format() {
137 |     return this.getString(4, 8);
138 |   }
139 | 
140 |   // 4 bytes at offset of 12 bytes
141 |   set SubChunk1ID(str) {
142 |     this.setString(str, 4, 12);
143 |   }
144 | 
145 |   get SubChunk1ID() {
146 |     return this.getString(4, 12);
147 |   }
148 | 
149 |   // 4 bytes at offset of 16 bytes
150 |   set SubChunk1Size(uint) {
151 |     this.view.setUint32(16, uint, this.littleEndian);
152 |   }
153 | 
154 |   get SubChunk1Size() {
155 |     return this.view.getUint32(16, this.littleEndian);
156 |   }
157 | 
158 |   // 2 bytes at offset of 20 bytes
159 |   set AudioFormat(uint) {
160 |     this.view.setUint16(20, uint, this.littleEndian);
161 |   }
162 | 
163 |   get AudioFormat() {
164 |     return this.view.getUint16(20, this.littleEndian);
165 |   }
166 | 
167 |   // 2 bytes at offset of 22 bytes
168 |   set NumChannels(uint) {
169 |     this.view.setUint16(22, uint, this.littleEndian);
170 |   }
171 | 
172 |   get NumChannels() {
173 |     return this.view.getUint16(22, this.littleEndian);
174 |   }
175 | 
176 |   // 4 bytes at offset of 24 bytes
177 |   set SampleRate(uint) {
178 |     this.view.setUint32(24, uint, this.littleEndian);
179 |   }
180 | 
181 |   get SampleRate() {
182 |     return this.view.getUint32(24, this.littleEndian);
183 |   }
184 | 
185 |   // 4 bytes at offset of 28 bytes
186 |   set ByteRate(uint) {
187 |     this.view.setUint32(28, uint, this.littleEndian);
188 |   }
189 | 
190 |   get ByteRate() {
191 |     return this.view.getUint32(28, this.littleEndian);
192 |   }
193 | 
194 |   // 2 bytes at offset of 32 bytes
195 |   set BlockAlign(uint) {
196 |     this.view.setUint16(32, uint, this.littleEndian);
197 |   }
198 | 
199 |   get BlockAlign() {
200 |     return this.view.getUint16(32, this.littleEndian);
201 |   }
202 | 
203 |   // 2 bytes at offset of 34 bytes
204 |   set BitsPerSample(uint) {
205 |     this.view.setUint16(34, uint, this.littleEndian);
206 |   }
207 | 
208 |   get BitsPerSample() {
209 |     return this.view.getUint16(34, this.littleEndian);
210 |   }
211 | 
212 |   // 4 bytes at offset of 36 bytes
213 |   set SubChunk2ID(str) {
214 |     this.setString(str, 4, 36);
215 |   }
216 | 
217 |   get SubChunk2ID() {
218 |     return this.getString(4, 36);
219 |   }
220 | 
221 |   // 4 bytes at offset of 40 bytes
222 |   set SubChunk2Size(uint) {
223 |     this.view.setUint32(40, uint, this.littleEndian);
224 |   }
225 | 
226 |   get SubChunk2Size() {
227 |     return this.view.getUint32(40, this.littleEndian);
228 |   }
229 | 
230 |   // internal getter for sound data as
231 |   // typed array based on header properties
232 |   get typedData() {
233 |     var bytesPerSample = this.BitsPerSample >>> 3;
234 |     var data = this.data;
235 |     var size = this.SubChunk2Size;
236 |     var samples = size / bytesPerSample;
237 |     var buffer = new ArrayBuffer(size);
238 |     var uint8 = new Uint8Array(buffer);
239 | 
240 |     // convert signed normalized sound data to typed integer data
241 |     // i.e. [-1, 1] -> [INT_MIN, INT_MAX]
242 |     var amplitude = Math.pow(2, (bytesPerSample << 3) - 1) - 1;
243 |     var i, d;
244 | 
245 |     switch (bytesPerSample) {
246 |     case 1:
247 |       // endianess not relevant for 8-bit encoding
248 |       for (i = 0; i < samples; i++) {
249 |         // convert by adding 0x80 instead of 0x100
250 |         // WAV uses unsigned data for 8-bit encoding
251 | 
252 |         // [INT8_MIN, INT8_MAX] -> [0, UINT8_MAX]
253 |         uint8[i] = (data[i] * amplitude + 0x80) & 0xFF;
254 |       }
255 |       break;
256 |     case 2:
257 |       // LSB first
258 |       if (this.littleEndian) {
259 |         for (i = 0; i < samples; i++) {
260 |           // [INT16_MIN, INT16_MAX] -> [0, UINT16_MAX]
261 |           d = (data[i] * amplitude + 0x10000) & 0xFFFF;
262 | 
263 |           // unwrap inner loop
264 |           uint8[i * 2    ] = (d      ) & 0xFF;
265 |           uint8[i * 2 + 1] = (d >>> 8);
266 |         }
267 |       // MSB first
268 |       } else {
269 |         for (i = 0; i < samples; i++) {
270 |           // [INT16_MIN, INT16_MAX] -> [0, UINT16_MAX]
271 |           d = (data[i] * amplitude + 0x10000) & 0xFFFF;
272 | 
273 |           // unwrap inner loop
274 |           uint8[i * 2    ] = (d >>> 8);
275 |           uint8[i * 2 + 1] = (d      ) & 0xFF;
276 |         }
277 |       }
278 |       break;
279 |     case 3:
280 |       // LSB first
281 |       if (this.littleEndian) {
282 |         for (i = 0; i < samples; i++) {
283 |           // [INT24_MIN, INT24_MAX] -> [0, UINT24_MAX]
284 |           d = (data[i] * amplitude + 0x1000000) & 0xFFFFFF;
285 | 
286 |           // unwrap inner loop
287 |           uint8[i * 3    ] = (d       ) & 0xFF;
288 |           uint8[i * 3 + 1] = (d >>>  8) & 0xFF;
289 |           uint8[i * 3 + 2] = (d >>> 16);
290 |         }
291 |       // MSB first
292 |       } else {
293 |         for (i = 0; i < samples; i++) {
294 |           // [INT24_MIN, INT24_MAX] -> [0, UINT24_MAX]
295 |           d = (data[i] * amplitude + 0x1000000) & 0xFFFFFF;
296 | 
297 |           // unwrap inner loop
298 |           uint8[i * 3    ] = (d >>> 16);
299 |           uint8[i * 3 + 1] = (d >>>  8) & 0xFF;
300 |           uint8[i * 3 + 2] = (d       ) & 0xFF;
301 |         }
302 |       }
303 |     case 4:
304 |       // LSB first
305 |       if (this.littleEndian) {
306 |         for (i = 0; i < samples; i++) {
307 |           // [INT32_MIN, INT32_MAX] -> [0, UINT32_MAX]
308 |           d = (data[i] * amplitude + 0x100000000) & 0xFFFFFFFF;
309 | 
310 |           // unwrap inner loop
311 |           uint8[i * 4    ] = (d       ) & 0xFF;
312 |           uint8[i * 4 + 1] = (d >>>  8) & 0xFF;
313 |           uint8[i * 4 + 2] = (d >>> 16) & 0xFF;
314 |           uint8[i * 4 + 3] = (d >>> 24);
315 |         }
316 |       // MSB first
317 |       } else {
318 |         for (i = 0; i < samples; i++) {
319 |           // [INT32_MIN, INT32_MAX] -> [0, UINT32_MAX]
320 |           d = (data[i] * amplitude + 0x100000000) & 0xFFFFFFFF;
321 | 
322 |           // unwrap inner loop
323 |           uint8[i * 4    ] = (d >>> 24);
324 |           uint8[i * 4 + 1] = (d >>> 16) & 0xFF;
325 |           uint8[i * 4 + 2] = (d >>>  8) & 0xFF;
326 |           uint8[i * 4 + 3] = (d       ) & 0xFF;
327 |         }
328 |       }
329 |     }
330 | 
331 |     return buffer;
332 |   }
333 | 
334 |   // binary container outputs
335 | 
336 |   // browser-specific
337 |   // generates blob from concatenated typed arrays
338 |   toBlob() {
339 |     return new Blob([this.header, this.typedData], {type: 'audio/wav'});
340 |   }
341 | 
342 |   // Node.js-specific
343 |   // generates buffer from concatenated typed arrays
344 |   toBuffer() {
345 |     return Buffer.concat([Buffer.from(this.header), Buffer.from(this.typedData)]);
346 |   }
347 | 
348 |   // pointer mutators
349 | 
350 |   // gets time (in seconds) of pointer
351 |   tell() {
352 |     return this.pointer / this.NumChannels / this.SampleRate;
353 |   }
354 | 
355 |   // sets time (in seconds) of pointer
356 |   // zero-fills by default
357 |   seek(time, fill = true) {
358 |     var data   = this.data;
359 |     var sample = Math.round(this.SampleRate * time);
360 | 
361 |     this.pointer = this.NumChannels * sample;
362 | 
363 |     if (fill) {
364 |       // zero-fill seek
365 |       while (data.length < this.pointer) {
366 |         data[data.length] = 0;
367 |       }
368 |     } else {
369 |       this.pointer = data.length;
370 |     }
371 |   }
372 | 
373 |   // sound data mutators
374 | 
375 |   // writes the specified note to the sound data
376 |   // for amount of time in seconds
377 |   // at given normalized amplitude
378 |   // to channels listed (or all by default)
379 |   // adds to existing data by default
380 |   // and does not reset write index after operation by default
381 |   writeNote({note, time, amplitude = 1}, channels = [], blend = true, reset = false) {
382 |     // creating local references to properties
383 |     var data = this.data;
384 |     var numChannels = this.NumChannels;
385 |     var sampleRate = this.SampleRate;
386 | 
387 |     // to prevent sound artifacts
388 |     const fadeSeconds = 0.001;
389 | 
390 |     // calculating properties of given note
391 |     var semitone = WAV.semitone(note);
392 |     var frequency = WAV.frequency(semitone) * Math.PI * 2 / sampleRate;
393 |     var period = Math.PI * 2 / frequency;
394 | 
395 |     // amount of blocks to be written
396 |     var blocksOut = Math.round(sampleRate * time);
397 |     // reduces sound artifacts by fading at last fadeSeconds
398 |     var nonZero = blocksOut - sampleRate * fadeSeconds;
399 |     // fade interval in samples
400 |     var fade = blocksOut - nonZero + 1;
401 | 
402 |     // index of start and stop samples
403 |     var start = this.pointer;
404 |     var stop = data.length;
405 | 
406 |     // determines amount of blocks to be updated
407 |     var blocksIn = Math.min(Math.floor((stop - start) / numChannels), blocksOut);
408 | 
409 |     // i = index of each sample block
410 |     // j = index of each channel in a block
411 |     // k = cached index of data
412 |     // d = sample data value
413 |     var i, j, k, d;
414 | 
415 |     // by default write to all channels
416 |     if (channels.length === 0) {
417 |       // don't overwrite passed array
418 |       channels = [];
419 | 
420 |       for (i = 0; i < numChannels; i++) {
421 |         channels[i] = i;
422 |       }
423 |     }
424 | 
425 |     // inline .indexOf() function calls into array references
426 |     var skipChannel = [];
427 | 
428 |     for (i = 0; i < numChannels; i++) {
429 |       skipChannel[i] = (channels.indexOf(i) === -1);
430 |     }
431 | 
432 |     // update existing data
433 |     for (i = 0; i < blocksIn; i++) {
434 |       // iterate through specified channels
435 |       for (j = 0; j < channels.length; j++) {
436 |         k = start + i * numChannels + channels[j];
437 |         d = 0;
438 | 
439 |         if (frequency > 0) {
440 |           d = amplitude * Math.sin(frequency * i) * ((i < fade) ? i : (i > nonZero) ? blocksOut - i + 1 : fade) / fade;
441 |         }
442 | 
443 |         data[k] = d + (blend ? data[k] : 0);
444 |       }
445 |     }
446 | 
447 |     // append data
448 |     for (i = blocksIn; i < blocksOut; i++) {
449 |       k = start + i * numChannels;
450 | 
451 |       // iterate through all channels
452 |       for (j = 0; j < numChannels; j++) {
453 |         d = 0;
454 | 
455 |         // only write non-zero data to specified channels
456 |         if (frequency > 0 || !skipChannel[j]) {
457 |           d = amplitude * Math.sin(frequency * i) * ((i < fade) ? i : (i > nonZero) ? blocksOut - i + 1 : fade) / fade;
458 |         }
459 | 
460 |         data[k + j] = d;
461 |       }
462 |     }
463 | 
464 |     // update header properties
465 |     var end = Math.max(start + blocksOut * numChannels, stop) * this.BitsPerSample >>> 3;
466 | 
467 |     this.ChunkSize = end + this.header.byteLength - 8;
468 |     this.SubChunk2Size = end;
469 | 
470 |     if (!reset) {
471 |       // move write index to end of written data
472 |       this.pointer = start + blocksOut * numChannels;
473 |     }
474 |   }
475 | 
476 |   // adds specified notes in series
477 |   // (or asynchronously if offset property is specified in a note)
478 |   // each playing for time * relativeDuration seconds
479 |   // followed by a time * (1 - relativeDuration) second rest
480 |   writeProgression(notes, amplitude = 1, channels = [], blend = true, reset = false, relativeDuration = 1) {
481 |     var start = this.pointer;
482 | 
483 |     for (var i = 0, note, time, amp, off, secs, rest; i < notes.length; i++) {
484 |       ({note, time, amplitude: amp, offset: off} = notes[i]);
485 | 
486 |       // for asynchronous progression
487 |       if (off !== undefined) {
488 |         this.seek(off);
489 |       }
490 | 
491 |       if (relativeDuration === 1 || note === 'REST') {
492 |         this.writeNote({note, time, amplitude: amp === undefined ? amplitude : amp * amplitude}, channels, blend, false);
493 |       } else {
494 |         secs = time * relativeDuration;
495 |         rest = time - secs;
496 | 
497 |         this.writeNote({note: note, time: secs, amplitude: amp === undefined ? amplitude : amp * amplitude}, channels, blend, false);
498 |         this.writeNote({note: 'REST', time: rest}, channels, blend, false);
499 |       }
500 |     }
501 | 
502 |     if (reset) {
503 |       this.pointer = start;
504 |     }
505 |   }
506 | };
507 | 
508 | module.exports = WAV;
509 | 


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