audio-inspect/dist/index.cjs

Lightweight yet powerful audio analysis library

// audio-inspect - Lightweight yet powerful audio analysis library
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y("UNSUPPORTED_FORMAT","WebFFT initialization failed");if(t.length!==this.size)throw new y("INVALID_INPUT",`\u5165\u529B\u30B5\u30A4\u30BA\u304C\u4E0D\u6B63\u3067\u3059\u3002\u671F\u5F85\u5024: ${this.size}, \u5B9F\u969B: ${t.length}`);let n=new Float32Array(this.size*2);for(let i=0;i<this.size;i++)n[i*2]=t[i]||0,n[i*2+1]=0;let a=this.fftInstance.fft(n),r=new Float32Array(this.size/2+1),s=new Float32Array(this.size/2+1),l=new Float32Array(this.size/2+1);for(let i=0;i<r.length;i++){let o=a[i*2]||0,c=a[i*2+1]||0;r[i]=Math.sqrt(o*o+c*c),s[i]=Math.atan2(c,o),l[i]=i*this.sampleRate/this.size}return{complex:a,magnitude:r,phase:s,frequencies:l}}async profile(){if(this.initializationPromise&&await this.initializationPromise,!this.fftInstance||!this.fftInstance.profile)throw new y("UNSUPPORTED_FORMAT","WebFFT\u304C\u521D\u671F\u5316\u3055\u308C\u3066\u3044\u307E\u305B\u3093");await this.fftInstance.profile()}dispose(){if(this.fftInstance)try{this.fftInstance.dispose&&this.fftInstance.dispose()}catch(t){console.warn("FFT instance disposal failed:",t)}finally{this.fftInstance=null,this.initializationPromise=null}}},de=class{constructor(t,n){this.size=t;this.sampleRate=n;if(!this.isPowerOfTwo(t))throw new y("INVALID_INPUT","FFT\u30B5\u30A4\u30BA\u306F2\u306E\u51AA\u3067\u3042\u308B\u5FC5\u8981\u304C\u3042\u308A\u307E\u3059");this.precomputeTables()}bitReversalTable;twiddleFactorsReal;twiddleFactorsImag;get name(){return"Native FFT (Cooley-Tukey)"}isPowerOfTwo(t){return t>0&&(t&t-1)===0}precomputeTables(){this.bitReversalTable=new Uint32Array(this.size);let t=Math.log2(this.size);for(let a=0;a<this.size;a++){let r=0;for(let s=0;s<t;s++)r=r<<1|a>>s&1;this.bitReversalTable[a]=r}let n=this.size/2;this.twiddleFactorsReal=new Float32Array(n),this.twiddleFactorsImag=new Float32Array(n);for(let a=0;a<n;a++){let r=-2*Math.PI*a/this.size;this.twiddleFactorsReal[a]=Math.cos(r),this.twiddleFactorsImag[a]=Math.sin(r)}}fft(t){if(t.length!==this.size)throw new y("INVALID_INPUT",`\u5165\u529B\u30B5\u30A4\u30BA\u304C\u4E0D\u6B63\u3067\u3059\u3002\u671F\u5F85\u5024: ${this.size}, \u5B9F\u969B: ${t.length}`);let n=new Float32Array(this.size),a=new Float32Array(this.size);for(let o=0;o<this.size;o++){let c=this.bitReversalTable[o];c!==void 0&&(n[c]=t[o]||0,a[c]=0)}for(let o=1;o<this.size;o*=2){let c=o*2,u=this.size/c;for(let m=0;m<this.size;m+=c)for(let f=0;f<o;f++){let p=f*u,g=this.twiddleFactorsReal[p]||0,h=this.twiddleFactorsImag[p]||0,b=m+f,A=m+f+o,d=n[b]||0,w=a[b]||0,S=n[A]||0,I=a[A]||0,x=S*g-I*h,v=S*h+I*g;n[b]=d+x,a[b]=w+v,n[A]=d-x,a[A]=w-v}}let r=new Float32Array(this.size*2),s=new Float32Array(this.size/2+1),l=new Float32Array(this.size/2+1),i=new Float32Array(this.size/2+1);for(let o=0;o<this.size;o++)if(r[o*2]=n[o]||0,r[o*2+1]=a[o]||0,o<=this.size/2){let 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oe=class{processor;inputBuffer;bufferPosition;windowSize;hopSize;sampleRate;constructor(t,n={}){this.sampleRate=t,this.processor=new H(t,n);let a=this.processor.getConfig();this.windowSize=a.windowSize,this.hopSize=a.hopSize,this.inputBuffer=new Float32Array(this.windowSize),this.bufferPosition=0}process(t,n){let a=[],r=0;for(;r<t.length;){let s=Math.min(t.length-r,this.windowSize-this.bufferPosition);if(this.inputBuffer.set(t.subarray(r,r+s),this.bufferPosition),this.bufferPosition+=s,r+=s,this.bufferPosition>=this.windowSize){let l=this.processor.processFrame(this.inputBuffer,n);a.push({...l,time:a.length*this.hopSize/this.sampleRate}),this.inputBuffer.copyWithin(0,this.hopSize),this.bufferPosition=this.windowSize-this.hopSize}}return{frames:a}}reset(){this.inputBuffer.fill(0),this.bufferPosition=0}getBufferStatus(){return{position:this.bufferPosition,size:this.windowSize}}};O();function ft(e,t,n,a){let r=0,s=0;for(let l=0;l<e.length&&l<t.length;l++){let i=t[l],o=e[l];i!==void 0&&o!==void 0&&i>=n&&i<=a&&(r+=i*o,s+=o)}return s>1e-10?r/s:0}function ht(e,t,n,a,r){let s=0,l=0;for(let i=0;i<e.length&&i<t.length;i++){let o=t[i],c=e[i];if(o!==void 0&&c!==void 0&&o>=a&&o<=r){let u=o-n;s+=u*u*c,l+=c}}return l>1e-10?Math.sqrt(s/l):0}function pt(e,t,n,a,r){let s=0;for(let o=0;o<e.length&&o<t.length;o++){let c=t[o],u=e[o];c!==void 0&&u!==void 0&&c>=a&&c<=r&&(s+=u*u)}let l=s*n,i=0;for(let o=0;o<e.length&&o<t.length;o++){let c=t[o],u=e[o];if(c!==void 0&&u!==void 0&&c>=a&&c<=r&&(i+=u*u,i>=l))return c}return r}function dt(e,t,n){let a=0,r=0,s=0;for(let l=t;l<=n&&l<e.length;l++){let i=e[l];if(i!==void 0){let o=Math.max(i,1e-10);a+=Math.log(o),r+=o,s++}}return s===0?0:(a=Math.exp(a/s),r=r/s,r>1e-10?a/r:0)}function gt(e){if(e.length<2)return 0;let t=0;for(let n=1;n<e.length;n++){let a=F(e[n-1]??0),r=F(e[n]??0);(a>=0&&r<0||a<0&&r>=0)&&t++}return t/(e.length-1)}function cn(e,t,n={normalize:!0}){if(!t||t.length===0)return 0;let a=Math.min(e.length,t.length);if(a===0)return 0;let r=e,s=t;if(n.normalize!==!1){let i=0,o=0;for(let m=0;m<a;m++){let f=e[m]??0,p=t[m]??0;i+=f*f,o+=p*p}let c=Math.sqrt(i),u=Math.sqrt(o);if(c>1e-10&&u>1e-10){r=new Float32Array(a),s=new Float32Array(a);for(let m=0;m<a;m++)r[m]=(e[m]??0)/c,s[m]=(t[m]??0)/u}}let l=0;for(let i=0;i<a;i++){let o=(r[i]??0)-(s[i]??0);l+=o*o}return Math.sqrt(l)}async function bt(e,t={}){let{fftSize:n=2048,windowFunction:a="hann",channel:r=0,minFrequency:s=0,maxFrequency:l=e.sampleRate/2,rolloffThreshold:i=.85}=t;if(r>=e.numberOfChannels)throw new y("INVALID_INPUT",`\u7121\u52B9\u306A\u30C1\u30E3\u30F3\u30CD\u30EB\u756A\u53F7: ${r}`);let o=await q(e,{fftSize:n,windowFunction:a,channel:r}),c=Math.max(0,Math.floor(s*n/e.sampleRate)),u=Math.min(o.frequencies.length-1,Math.floor(l*n/e.sampleRate)),m=ft(o.magnitude,o.frequencies,s,l),f=ht(o.magnitude,o.frequencies,m,s,l),p=pt(o.magnitude,o.frequencies,i,s,l),g=dt(o.magnitude,c,u),h=e.channelData[r];if(!h)throw new y("INVALID_INPUT",`\u30C1\u30E3\u30F3\u30CD\u30EB ${r} \u306E\u30C7\u30FC\u30BF\u304C\u5B58\u5728\u3057\u307E\u305B\u3093`);let b=gt(h);return{spectralCentroid:m,spectralBandwidth:f,spectralRolloff:p,spectralFlatness:g,zeroCrossingRate:b,frequencyRange:{min:s,max:l}}}async function yt(e,t={}){let{frameSize:n=2048,hopSize:a=n/2,fftSize:r=n,windowFunction:s="hann",channel:l=0,minFrequency:i=0,maxFrequency:o=e.sampleRate/2,rolloffThreshold:c=.85,numFrames:u}=t;if(l>=e.numberOfChannels)throw new y("INVALID_INPUT",`\u7121\u52B9\u306A\u30C1\u30E3\u30F3\u30CD\u30EB\u756A\u53F7: ${l}`);let m=e.channelData[l];if(!m)throw new y("INVALID_INPUT",`\u30C1\u30E3\u30F3\u30CD\u30EB ${l} \u306E\u30C7\u30FC\u30BF\u304C\u5B58\u5728\u3057\u307E\u305B\u3093`);let f=u||Math.floor((m.length-n)/a)+1;if(f<=0)throw new y("INVALID_INPUT","\u30D5\u30EC\u30FC\u30E0\u6570\u304C\u4E0D\u6B63\u3067\u3059");let p=new Float32Array(f),g=new Float32Array(f),h=new Float32Array(f),b=new Float32Array(f),A=new Float32Array(f),d=new Float32Array(f),w=new Float32Array(f),S,{FFTProviderFactory:I}=await Promise.resolve().then(()=>(re(),tt)),x=await I.createProvider({type:"native",fftSize:r,sampleRate:e.sampleRate,enableProfiling:!1});try{for(let v=0;v<f;v++){let C=v*a,E=Math.min(C+n,m.length);p[v]=C/e.sampleRate;let L=m.subarray(C,E),k=new Float32Array(r),U=Math.min(L.length,r);U>0&&k.set(L.subarray(0,U));let P=Ft(k,s),M=await x.fft(P),D=Math.max(0,Math.floor(i*r/e.sampleRate)),T=Math.min(M.frequencies.length-1,Math.floor(o*r/e.sampleRate)),R=ft(M.frequencies,M.magnitude,D,T);g[v]=R,h[v]=ht(M.frequencies,M.magnitude,D,T,R),b[v]=pt(M.frequencies,M.magnitude,D,T,c),A[v]=dt(M.magnitude,D,T),w[v]=gt(k),d[v]=cn(M.magnitude,S),S=new Float32Array(M.magnitude)}}finally{x.dispose()}return{times:p,spectralCentroid:g,spectralBandwidth:h,spectralRolloff:b,spectralFlatness:A,spectralFlux:d,zeroCrossingRate:w,frameInfo:{frameSize:n,hopSize:a,numFrames:f}}}function un(e,t,n){let a=[],r=0;for(let c=t;c<=n&&c<e.length;c++){let u=e[c];if(u!==void 0){let m=u*u;a.push(m),r+=m}}if(a.length===0||r<=1e-10)return{entropy:0,entropyNorm:0};let s=a.map(c=>c/r),l=0;for(let c of s)c>1e-10&&(l-=c*Math.log2(c));let i=Math.log2(a.l