@chordbook/tuner/dist/index.js

The tuner used by ChordBook.app

import{PitchDetector as M}from"pitchy";var y=69,D=["C","C\u266F","D","D\u266F","E","F","F\u266F","G","G\u266F","A","A\u266F","B"],S={a4:440,clarityThreshold:.9,minVolumeDecibels:-1e3,bufferSize:8192,smoothingTimeConstant:.8,minFrequency:27.5,maxFrequency:4186.01,updateInterval:50,sampleRate:44100};function x(e={}){e={...S,...e};let n=new AudioContext({sampleRate:e.sampleRate}),f=new BiquadFilterNode(n,{type:"highpass",frequency:e.minFrequency}),l=new BiquadFilterNode(n,{type:"lowpass",frequency:e.maxFrequency}),s=new AnalyserNode(n,{fftSize:e.bufferSize,smoothingTimeConstant:e.smoothingTimeConstant});l.connect(f).connect(s);let u=M.forFloat32Array(s.fftSize);u.minVolumeDecibels=e.minVolumeDecibels;let d=new Float32Array(u.inputLength),a,h,p=0;async function F(){a=await navigator.mediaDevices.getUserMedia({audio:!0}),h=n.createMediaStreamSource(a),h.connect(l),p=setInterval(T,e.updateInterval)}function T(){let{clarityThreshold:t,minFrequency:i,maxFrequency:r,onNote:m}=e;s.getFloatTimeDomainData(d);let[o,c]=u.findPitch(d,n.sampleRate);c>t&&o>i&&o<r&&m?.(b(o,c))}function b(t,i){let r=Math.round(12*(Math.log(t/e.a4)/Math.log(2)))+y,m=e.a4*Math.pow(2,(r-y)/12),o=Math.floor(1200*Math.log(t/m)/Math.log(2)),c=D[r%12],q=Math.floor(r/12)-1;return{frequency:t,name:c,value:r,cents:o,octave:q,clarity:i}}async function v(){clearInterval(p),a.getTracks().forEach(t=>t.stop()),a.removeTrack(a.getAudioTracks()[0])}return{start:F,stop:v,context:n,analyser:s,detector:u,config:e,getNote:b}}export{S as TunerDefaults,x as createTuner};
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