audio-inspect
Version:
Lightweight yet powerful audio analysis library
1 lines • 58.1 kB
JavaScript
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we(e,r={}){let{framesPerSecond:t=60,channel:n="mix",method:a="rms"}=r,o=z(e,n),i=Math.ceil(e.duration*t),s=e.length>0?e.length:i>0?1:0,l=Math.min(i,s),c=l>0?Math.max(1,Math.floor(e.length/l)):0,m=[],f=0,u=0;for(let b=0;b<l;b++){let p=b*c,d=Math.min(p+c,o.length);if(d<=p){let S=m.length>0?de(m,m.length-1,{time:0,amplitude:0}).amplitude:0;m.push({time:(p+c/2)/e.sampleRate,amplitude:S});continue}let F=o.subarray(p,d),y;switch(a){case"peak":y=Me(F);break;case"average":y=xe(F);break;case"rms":default:y=Se(F);break}let g=(p+(d-p)/2)/e.sampleRate;m.push({time:g,amplitude:y}),f=Math.max(f,y),u+=y}let h=l>0?u/l:0;return{waveform:m,maxAmplitude:f,averageAmplitude:h,frameCount:l,samplesPerFrame:c}}function Se(e){if(e.length===0)return 0;let r=0;for(let t=0;t<e.length;t++){let n=e[t];r+=n*n}return Math.sqrt(r/e.length)}function Me(e){let r=0;for(let t=0;t<e.length;t++){let n=Math.abs(e[t]);r=Math.max(r,n)}return r}function xe(e){if(e.length===0)return 0;let r=0;for(let 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ee=class{constructor(r,t,n=!1){this.size=r;this.sampleRate=t;this.enableProfiling=n;this.complexInput=new Float32Array(this.size*2),this.frequencyBins=Pe(this.size,this.sampleRate),this.initializationPromise=this.initializeWebFFT()}fftInstance=null;initializationPromise=null;complexInput;frequencyBins;get name(){return"WebFFT"}async waitForInitialization(){this.initializationPromise&&await this.initializationPromise}async initializeWebFFT(){try{let t=(await import("webfft")).default;this.fftInstance=new t(this.size),this.enableProfiling&&this.fftInstance?.profile&&await this.fftInstance.profile()}catch(r){throw new w("UNSUPPORTED_FORMAT",`Failed to initialize WebFFT: ${r instanceof Error?r.message:String(r)}`)}}async fft(r){if(this.initializationPromise&&await this.initializationPromise,!this.fftInstance)throw new w("UNSUPPORTED_FORMAT","WebFFT initialization failed");if(r.length!==this.size)throw new w("INVALID_INPUT",`Invalid input size. Expected: ${this.size}, Actual: ${r.length}`);for(let o=0;o<this.size;o++)this.complexInput[o*2]=r[o],this.complexInput[o*2+1]=0;let t=this.fftInstance.fft(this.complexInput),n=new Float32Array(this.size/2+1),a=new Float32Array(this.size/2+1);for(let o=0;o<n.length;o++){let i=t[o*2],s=t[o*2+1];n[o]=Math.sqrt(i*i+s*s),a[o]=Math.atan2(s,i)}return{complex:t,magnitude:n,phase:a,frequencies:this.frequencyBins}}async profile(){if(this.initializationPromise&&await this.initializationPromise,!this.fftInstance||!this.fftInstance.profile)throw new w("UNSUPPORTED_FORMAT","WebFFT is not initialized");await this.fftInstance.profile()}dispose(){if(this.fftInstance)try{this.fftInstance.dispose&&this.fftInstance.dispose()}catch(r){console.warn("FFT instance disposal failed:",r)}finally{this.fftInstance=null,this.initializationPromise=null}}},te=class{constructor(r,t){this.size=r;this.sampleRate=t;if(!this.isPowerOfTwo(r))throw new w("INVALID_INPUT","FFT size must be a power of two");this.precomputeTables()}bitReversalTable;twiddleFactorsReal;twiddleFactorsImag;scratchReal;scratchImag;frequencyBins;get name(){return"Native FFT (Cooley-Tukey)"}isPowerOfTwo(r){return r>0&&(r&r-1)===0}precomputeTables(){this.bitReversalTable=new Uint32Array(this.size);let r=Math.log2(this.size);for(let n=0;n<this.size;n++){let a=0;for(let o=0;o<r;o++)a=a<<1|n>>o&1;this.bitReversalTable[n]=a}let t=this.size/2;this.twiddleFactorsReal=new Float32Array(t),this.twiddleFactorsImag=new Float32Array(t);for(let n=0;n<t;n++){let a=-2*Math.PI*n/this.size;this.twiddleFactorsReal[n]=Math.cos(a),this.twiddleFactorsImag[n]=Math.sin(a)}this.scratchReal=new Float32Array(this.size),this.scratchImag=new Float32Array(this.size),this.frequencyBins=Pe(this.size,this.sampleRate)}fft(r){if(r.length!==this.size)throw new w("INVALID_INPUT",`Invalid input size. 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at(e,r={}){let{numMelFilters:t=80,minFrequency:n=0,maxFrequency:a=e.sampleRate/2,preEmphasis:o=.97,provider:i="native",enableProfiling:s=!1,providerCache:l,power:c,logScale:m=!0,logEpsilon:f=1e-10}=r,u=tt(c),h=z(e,r.channel??"mix"),b=se(h,o),p=ie(e,b.length,r,"hamming"),d=et(t,p.fftSize,e.sampleRate,n,a),F=[],y=new Float32Array(p.numFrames),g=new Float32Array(p.fftSize),{provider:S,release:x}=await E({fftSize:p.fftSize,sampleRate:e.sampleRate,provider:i,enableProfiling:s,fallbackToNative:i==="webfft",cache:l});try{for(let A=0;A<p.numFrames;A++){let I=A*p.hopSizeSamples;y[A]=I/e.sampleRate,L({src:b,srcStart:I,frameLength:Math.min(p.frameSizeSamples,Math.max(0,b.length-I)),dst:g,windowType:p.windowFunction});let C=await S.fft(g),R=nt(C.magnitude,u),P=rt(R,d.filters,f),M=new Array(P.length);for(let v=0;v<P.length;v++){let 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w("INVALID_INPUT","Stereo analysis requires audio with at least two channels");let{frameSize:t=Math.min(8192,e.length),calculatePhase:n=!1,calculateITD:a=!1,calculateILD:o=!1,provider:i="native",enableProfiling:s=!1,providerCache:l}=r,c=e.channelData[0],m=e.channelData[1];if(!c||!m)throw new w("INVALID_INPUT","L/R channel data is missing");let f=Math.min(c.length,m.length);if(f===0)return{correlation:0,width:0,balance:0,midSideRatio:0};let u=ut(c,m,!0),h={correlation:u.correlation,width:u.width,balance:u.balance,midSideRatio:u.midSideRatio};if(u.side&&u.mid&&(h.goniometer={x:u.side,y:u.mid}),n){let b=Math.max(32,Math.min(t,f)),p=Q(b),d=Math.max(1,Math.floor(b/2)),{provider:F,release:y}=await E({fftSize:p,sampleRate:e.sampleRate,provider:i,enableProfiling:s,fallbackToNative:i==="webfft",cache:l});try{let[g,S]=await Promise.all([X(c.subarray(0,b),0,p,F),X(m.subarray(0,b),0,p,F)]);h.coherence=await sn(c.subarray(0,f),m.subarray(0,f),p,d,F),h.widthFrequency=ln(g.magnitude,S.magnitude,g.phase,S.phase);let x=0,A=0,I=0;for(let C=1;C<g.phase.length;C++){let R=g.magnitude[C],P=S.magnitude[C],M=R*P;if(M<=0)continue;let v=an(g.phase[C]-S.phase[C]);x+=v*M,A+=Math.cos(v)*M,I+=M}h.phaseDifference=I>1e-10?x/I*180/Math.PI:0,h.phaseCorrelation=I>1e-10?A/I:0}finally{y()}}if(a){let b=Math.max(1,Math.round(e.sampleRate*.001)),p=on(c.subarray(0,Math.min(t,f)),m.subarray(0,Math.min(t,f)),b);h.itd=p/e.sampleRate*1e3}if(o){let b=Math.sqrt(u.energyL/f),p=Math.sqrt(u.energyR/f);h.ild=b>1e-10&&p>1e-10?k(p/b,1):0}return h}async function ht(e,r={}){if(e.numberOfChannels<2)throw new w("INVALID_INPUT","Stereo analysis requires audio with at least two channels");let t=e.channelData[0],n=e.channelData[1];if(!t||!n)throw new w("INVALID_INPUT","L/R channel data is missing");let a=Math.min(t.length,n.length);if(a===0)return{times:new Float32Array(0),correlation:new Float32Array(0),width:new Float32Array(0),balance:new Float32Array(0)};let o=Math.max(32,Math.min(r.windowSize??r.frameSize??2048,a)),i=r.hopSize??Math.max(1,Math.floor(o/2));if(i<=0)throw new w("INVALID_INPUT","hopSize must be a positive integer");let s=a<=o?1:Math.floor((a-o)/i)+1,l=new Float32Array(s),c=new Float32Array(s),m=new Float32Array(s),f=new Float32Array(s);for(let u=0;u<s;u++){let h=u*i,b=Math.min(h+o,a),p=ut(t.subarray(h,b),n.subarray(h,b),!1);l[u]=(h+(b-h)/2)/e.sampleRate,c[u]=p.correlation,m[u]=p.width,f[u]=p.balance}return{times:l,correlation:c,width:m,balance:f}}function cn(e,r=.97){let t=new Float32Array(e.length);if(e.length===0)return t;t[0]=e[0];for(let n=1;n<e.length;n++)t[n]=e[n]-r*e[n-1];return t}function mn(e,r,t,n,a=!1){let o=[],i=[];return e.length===0?{energies:new Float32Array(0),times:new Float32Array(0)}:(U({samples:e,frameSize:r,hopSize:t,sampleRate:n,padEnd:!0},({frame:s,timeSec:l})=>{let c=0;for(let m=0;m<s.length;m++){let f=s[m];c+=f*f}c/=s.length,o.push(a?B(c,1,-100):c),i.push(l)}),{energies:new Float32Array(o),times:new Float32Array(i)})}function un(e,r,t,n=!0){let a=[];return e.length===0?new Float32Array(0):(U({samples:e,frameSize:r,hopSize:t,sampleRate:1,padEnd:!0},({frame:o})=>{let i=0,s=Math.sign(o[0]??0);for(let l=1;l<o.length;l++){let c=Math.sign(o[l]??0);s!==c&&s!==0&&c!==0&&(i+=1),s=c}a.push(n?i/Math.max(1,o.length-1):i)}),new Float32Array(a))}function fn(e,r,t,n=10){let a=new Float32Array(e.length),o=0,i=Math.min(n,e.length);for(let s=0;s<i;s++)o+=e[s];o=i>0?o/i:0;for(let s=0;s<e.length;s++){let l=e[s];if(s===0)a[s]=o*t;else{let c=a[s-1];c!==void 0&&l<c&&(o=r*o+(1-r)*l),a[s]=o*t}}return a}function hn(e,r=5){let t=new Float32Array(e.length),n=Math.floor(r/2);for(let a=0;a<e.length;a++){let o=Math.max(0,a-n),i=Math.min(e.length,a+n+1),s=[];for(let l=o;l<i;l++)s.push(e[l]);if(s.sort((l,c)=>l-c),s.length>0){let l=Math.floor(s.length/2);t[a]=s[l]}else t[a]=0}return t}function pn(e,r,t=.5,n=.1,a=.3){let o=[],i=null;for(let s=0;s<e.length;s++){let l=e[s],c=r[s],m=l>=t;if(!i)i={start:c,end:c,type:m?"speech":"silence",confidence:Math.abs(l-.5)*2};else if(m&&i.type==="speech"||!m&&i.type==="silence"){i.end=c;let f=Math.abs(l-.5)*2;i.confidence=Math.max(i.confidence||0,f)}else o.push(i),i={start:c,end:c,type:m?"speech":"silence",confidence:Math.abs(l-.5)*2}}return i&&o.push(i),dn(o,n,a)}function dn(e,r,t){if(e.length===0)return[];let n=[],a=0;for(;a<e.length;){let o=e[a];if(!o){a++;continue}let i=o.end-o.start;if(o.type==="speech"&&i>=r||o.type==="silence"&&i>=t)n.push(o),a++;else{if(n.length>0&&a+1<e.length){let s=n[n.length-1],l=e[a+1];if(s&&l&&s.type===l.type){s.end=l.end,a+=2;continue}}if(n.length>0){let s=n[n.length-1];s&&(s.end=o.end)}a++}}return n}function pt(e,r={}){let{channel:t="mix",frameSizeMs:n=30,hopSizeMs:a=10,method:o="combined",energyThreshold:i=.02,zcrThresholdLow:s=.05,zcrThresholdHigh:l=.15,adaptiveAlpha:c=.99,noiseFactor:m=3,minSilenceDurationMs:f=300,minSpeechDurationMs:u=100,preEmphasis:h=!0,smoothing:b=!0}=r,p=z(e,t);h&&(p=cn(p));let d=e.sampleRate,F=Math.floor(n/1e3*d),y=Math.floor(a/1e3*d);if(F===0||y===0)return{segments:[],speechRatio:0};let{energies:g,times:S}=mn(p,F,y,d,!1),x=un(p,F,y,!0);if(g.length===0)return{segments:[],speechRatio:0};let A=new Float32Array(g