synth-js/dst/synth.min.js

high performance MIDI parser and WAV encoder

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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),
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 0!==arguments[4]&&arguments[4],l=arguments.length>5&&void 0!==arguments[5]?arguments[5]:1,c=this.pointer,p=0;p<t.length;p++){var y=t[p];e=y.note,r=y.time,n=y.amplitude,i=y.offset,void 0!==i&&this.seek(i),1===l||"REST"===e?this.writeNote({note:e,time:r,amplitude:void 0===n?s:n*s},u,f,!1):(o=r*l,a=r-o,this.writeNote({note:e,time:o,amplitude:void 0===n?s:n*s},u,f,!1),this.writeNote({note:"REST",time:a},u,f,!1))}h&&(this.pointer=c)}},{key:"ChunkID",set:function(t){this.setString(t,4,0)},get:function(){return this.getString(4,0)}},{key:"ChunkSize",set:function(t){this.view.setUint32(4,t,this.littleEndian)},get:function(){return this.view.getUint32(4,this.littleEndian)}},{key:"Format",set:function(t){this.setString(t,4,8)},get:function(){return this.getString(4,8)}},{key:"SubChunk1ID",set:function(t){this.setString(t,4,12)},get:function(){return this.getString(4,12)}},{key:"SubChunk1Size",set:function(t){this.view.setUint32(16,t,this.littleEndian)},get:function(){return this.view.getUint32(16,this.littleEndian)}},{key:"AudioFormat",set:function(t){this.view.setUint16(20,t,this.littleEndian)},get:function(){return this.view.getUint16(20,this.littleEndian)}},{key:"NumChannels",set:function(t){this.view.setUint16(22,t,this.littleEndian)},get:function(){return this.view.getUint16(22,this.littleEndian)}},{key:"SampleRate",set:function(t){this.view.setUint32(24,t,this.littleEndian)},get:function(){return this.view.getUint32(24,this.littleEndian)}},{key:"ByteRate",set:function(t){this.view.setUint32(28,t,this.littleEndian)},get:function(){return this.view.getUint32(28,this.littleEndian)}},{key:"BlockAlign",set:function(t){this.view.setUint16(32,t,this.littleEndian)},get:function(){return this.view.getUint16(32,this.littleEndian)}},{key:"BitsPerSample",set:function(t){this.view.setUint16(34,t,this.littleEndian)},get:function(){return this.view.getUint16(34,this.littleEndian)}},{key:"SubChunk2ID",set:function(t){this.setString(t,4,36)},get:function(){return this.getString(4,36)}},{key:"SubChunk2Size",set:function(t){this.view.setUint32(40,t,this.littleEndian)},get:function(){return this.view.getUint32(40,this.littleEndian)}},{key:"typedData",get:function(){var t,e,r=this.BitsPerSample>>>3,n=this.data,i=this.SubChunk2Size,o=i/r,a=new ArrayBuffer(i),s=new Uint8Array(a),u=Math.pow(2,(r<<3)-1)-1;switch(r){case 1:for(t=0;t<o;t++)s[t]=n[t]*u+128&255;break;case 2:if(this.littleEndian)for(t=0;t<o;t++)e=n[t]*u+65536&65535,s[2*t]=255&e,s[2*t+1]=e>>>8;else for(t=0;t<o;t++)e=n[t]*u+65536&65535,s[2*t]=e>>>8,s[2*t+1]=255&e;break;case 3:if(this.littleEndian)for(t=0;t<o;t++)e=n[t]*u+16777216&16777215,s[3*t]=255&e,s[3*t+1]=e>>>8&255,s[3*t+2]=e>>>16;else for(t=0;t<o;t++)e=n[t]*u+16777216&16777215,s[3*t]=e>>>16,s[3*t+1]=e>>>8&255,s[3*t+2]=255&e;case 4:if(this.littleEndian)for(t=0;t<o;t++)e=n[t]*u+4294967296&4294967295,s[4*t]=255&e,s[4*t+1]=e>>>8&255,s[4*t+2]=e>>>16&255,s[4*t+3]=e>>>24;else for(t=0;t<o;t++)e=n[t]*u+4294967296&4294967295,s[4*t]=e>>>24,s[4*t+1]=e>>>16&255,s[4*t+2]=e>>>8&255,s[4*t+3]=255&e}return a}}]),e}();e.exports=o}).call(this,t("buffer").Buffer)},{buffer:3}]},{},[1])(1)});
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