wavesurfer.js/dist/plugins/spectrogram.min.js

Audio waveform player

!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):((t="undefined"!=typeof globalThis?globalThis:t||self).WaveSurfer=t.WaveSurfer||{},t.WaveSurfer.Spectrogram=e())}(this,(function(){"use strict";function t(t,e,s,i){return new(s||(s=Promise))((function(a,r){function n(t){try{h(i.next(t))}catch(t){r(t)}}function o(t){try{h(i.throw(t))}catch(t){r(t)}}function h(t){var e;t.done?a(t.value):(e=t.value,e instanceof s?e:new s((function(t){t(e)}))).then(n,o)}h((i=i.apply(t,e||[])).next())}))}"function"==typeof SuppressedError&&SuppressedError;class e{constructor(){this.listeners={}}on(t,e,s){if(this.listeners[t]||(this.listeners[t]=new Set),this.listeners[t].add(e),null==s?void 0:s.once){const s=()=>{this.un(t,s),this.un(t,e)};return this.on(t,s),s}return()=>this.un(t,e)}un(t,e){var s;null===(s=this.listeners[t])||void 0===s||s.delete(e)}once(t,e){return this.on(t,e,{once:!0})}unAll(){this.listeners={}}emit(t,...e){this.listeners[t]&&this.listeners[t].forEach((t=>t(...e)))}}class s extends e{constructor(t){super(),this.subscriptions=[],this.options=t}onInit(){}_init(t){this.wavesurfer=t,this.onInit()}destroy(){this.emit("destroy"),this.subscriptions.forEach((t=>t()))}}function i(t,e){const s=e.xmlns?document.createElementNS(e.xmlns,t):document.createElement(t);for(const[t,a]of Object.entries(e))if("children"===t)for(const[t,a]of Object.entries(e))"string"==typeof a?s.appendChild(document.createTextNode(a)):s.appendChild(i(t,a));else"style"===t?Object.assign(s.style,a):"textContent"===t?s.textContent=a:s.setAttribute(t,a.toString());return s}function a(t,e,s){const a=i(t,e||{});return null==s||s.appendChild(a),a}function r(t,e,s,i){switch(this.bufferSize=t,this.sampleRate=e,this.bandwidth=2/t*(e/2),this.sinTable=new Float32Array(t),this.cosTable=new Float32Array(t),this.windowValues=new Float32Array(t),this.reverseTable=new Uint32Array(t),this.peakBand=0,this.peak=0,s){case"bartlett":for(a=0;a<t;a++)this.windowValues[a]=2/(t-1)*((t-1)/2-Math.abs(a-(t-1)/2));break;case"bartlettHann":for(a=0;a<t;a++)this.windowValues[a]=.62-.48*Math.abs(a/(t-1)-.5)-.38*Math.cos(2*Math.PI*a/(t-1));break;case"blackman":for(i=i||.16,a=0;a<t;a++)this.windowValues[a]=(1-i)/2-.5*Math.cos(2*Math.PI*a/(t-1))+i/2*Math.cos(4*Math.PI*a/(t-1));break;case"cosine":for(a=0;a<t;a++)this.windowValues[a]=Math.cos(Math.PI*a/(t-1)-Math.PI/2);break;case"gauss":for(i=i||.25,a=0;a<t;a++)this.windowValues[a]=Math.pow(Math.E,-.5*Math.pow((a-(t-1)/2)/(i*(t-1)/2),2));break;case"hamming":for(a=0;a<t;a++)this.windowValues[a]=.54-.46*Math.cos(2*Math.PI*a/(t-1));break;case"hann":case void 0:for(a=0;a<t;a++)this.windowValues[a]=.5*(1-Math.cos(2*Math.PI*a/(t-1)));break;case"lanczoz":for(a=0;a<t;a++)this.windowValues[a]=Math.sin(Math.PI*(2*a/(t-1)-1))/(Math.PI*(2*a/(t-1)-1));break;case"rectangular":for(a=0;a<t;a++)this.windowValues[a]=1;break;case"triangular":for(a=0;a<t;a++)this.windowValues[a]=2/t*(t/2-Math.abs(a-(t-1)/2));break;default:throw Error("No such window function '"+s+"'")}for(var a,r=1,n=t>>1;r<t;){for(a=0;a<r;a++)this.reverseTable[a+r]=this.reverseTable[a]+n;r<<=1,n>>=1}for(a=0;a<t;a++)this.sinTable[a]=Math.sin(-Math.PI/a),this.cosTable[a]=Math.cos(-Math.PI/a);this.calculateSpectrum=function(t){var e,s,i,a=this.bufferSize,r=this.cosTable,n=this.sinTable,o=this.reverseTable,h=new Float32Array(a),l=new Float32Array(a),c=2/this.bufferSize,f=Math.sqrt,u=new Float32Array(a/2),p=Math.floor(Math.log(a)/Math.LN2);if(Math.pow(2,p)!==a)throw"Invalid buffer size, must be a power of 2.";if(a!==t.length)throw"Supplied buffer is not the same size as defined FFT. FFT Size: "+a+" Buffer Size: "+t.length;for(var d,w,b,g,M,v,m,y,x=1,S=0;S<a;S++)h[S]=t[o[S]]*this.windowValues[o[S]],l[S]=0;for(;x<a;){d=r[x],w=n[x],b=1,g=0;for(var q=0;q<x;q++){for(S=q;S<a;)v=b*h[M=S+x]-g*l[M],m=b*l[M]+g*h[M],h[M]=h[S]-v,l[M]=l[S]-m,h[S]+=v,l[S]+=m,S+=x<<1;b=(y=b)*d-g*w,g=y*w+g*d}x<<=1}S=0;for(var C=a/2;S<C;S++)(i=c*f((e=h[S])*e+(s=l[S])*s))>this.peak&&(this.peakBand=S,this.peak=i),u[S]=i;return u}}class n extends s{static create(t){return new n(t||{})}constructor(t){if(super(t),this.frequenciesDataUrl=t.frequenciesDataUrl,this.container="string"==typeof t.container?document.querySelector(t.container):t.container,t.colorMap){if(t.colorMap.length<256)throw new Error("Colormap must contain 256 elements");for(let e=0;e<t.colorMap.length;e++){if(4!==t.colorMap[e].length)throw new Error("ColorMap entries must contain 4 values")}this.colorMap=t.colorMap}else{this.colorMap=[];for(let t=0;t<256;t++){const e=(255-t)/256;this.colorMap.push([e,e,e,1])}}this.fftSamples=t.fftSamples||512,this.height=t.height||this.fftSamples/2,this.noverlap=t.noverlap,this.windowFunc=t.windowFunc,this.alpha=t.alpha,this.frequencyMin=t.frequencyMin||0,this.frequencyMax=t.frequencyMax||0,this.createWrapper(),this.createCanvas()}onInit(){this.container=this.container||this.wavesurfer.getWrapper(),this.container.appendChild(this.wrapper),this.wavesurfer.options.fillParent&&Object.assign(this.wrapper.style,{width:"100%",overflowX:"hidden",overflowY:"hidden"}),this.subscriptions.push(this.wavesurfer.on("redraw",(()=>this.render())))}destroy(){this.unAll(),this.wavesurfer.un("ready",this._onReady),this.wavesurfer.un("redraw",this._onRender),this.wavesurfer=null,this.util=null,this.options=null,this.wrapper&&(this.wrapper.remove(),this.wrapper=null),super.destroy()}loadFrequenciesData(e){return t(this,void 0,void 0,(function*(){const t=yield fetch(e);if(!t.ok)throw new Error("Unable to fetch frequencies data");const s=yield t.json();this.drawSpectrogram(s)}))}createWrapper(){this.wrapper=a("div",{style:{display:"block",position:"relative",userSelect:"none"}}),this.options.labels&&(this.labelsEl=a("canvas",{part:"spec-labels",style:{position:"absolute",zIndex:9,width:"55px",height:"100%"}},this.wrapper)),this.wrapper.addEventListener("click",this._onWrapperClick)}createCanvas(){this.canvas=a("canvas",{style:{position:"absolute",left:0,top:0,width:"100%",height:"100%",zIndex:4}},this.wrapper),this.spectrCc=this.canvas.getContext("2d")}render(){var t;if(this.frequenciesDataUrl)this.loadFrequenciesData(this.frequenciesDataUrl);else{const e=null===(t=this.wavesurfer)||void 0===t?void 0:t.getDecodedData();e&&this.drawSpectrogram(this.getFrequencies(e))}}drawSpectrogram(t){isNaN(t[0][0])||(t=[t]),this.wrapper.style.height=this.height*t.length+"px",this.width=this.wavesurfer.getWrapper().offsetWidth,this.canvas.width=this.width,this.canvas.height=this.height*t.length;const e=this.spectrCc,s=this.height,i=this.width,a=this.buffer.sampleRate/2,r=this.frequencyMin,n=this.frequencyMax;if(e){for(let o=0;o<t.length;o++){const h=this.resample(t[o]),l=new ImageData(i,s);for(let t=0;t<h.length;t++)for(let e=0;e<h[t].length;e++){const a=this.colorMap[h[t][e]],r=4*((s-e)*i+t);l.data[r]=255*a[0],l.data[r+1]=255*a[1],l.data[r+2]=255*a[2],l.data[r+3]=255*a[3]}createImageBitmap(l).then((t=>{e.drawImage(t,0,s*(1-n/a),i,s*(n-r)/a,0,s*o,i,s)}))}this.options.labels&&this.loadLabels(this.options.labelsBackground,"12px","12px","",this.options.labelsColor,this.options.labelsHzColor||this.options.labelsColor,"center","#specLabels",t.length),this.emit("ready")}}getFrequencies(t){var e,s;const i=this.fftSamples,a=(null!==(e=this.options.splitChannels)&&void 0!==e?e:null===(s=this.wavesurfer)||void 0===s?void 0:s.options.splitChannels)?t.numberOfChannels:1;if(this.frequencyMax=this.frequencyMax||t.sampleRate/2,!t)return;this.buffer=t;const n=t.sampleRate,o=[];let h=this.noverlap;if(!h){const e=t.length/this.canvas.width;h=Math.max(0,Math.round(i-e))}const l=new r(i,n,this.windowFunc,this.alpha);for(let e=0;e<a;e++){const s=t.getChannelData(e),a=[];let r=0;for(;r+i<s.length;){const t=s.slice(r,r+i),e=l.calculateSpectrum(t),n=new Uint8Array(i/2);for(let t=0;t<i/2;t++)n[t]=Math.max(-255,45*Math.log10(e[t]));a.push(n),r+=i-h}o.push(a)}return o}freqType(t){return t>=1e3?(t/1e3).toFixed(1):Math.round(t)}unitType(t){return t>=1e3?"KHz":"Hz"}loadLabels(t,e,s,i,a,r,n,o,h){t=t||"rgba(68,68,68,0)",e=e||"12px",s=s||"12px",i=i||"Helvetica",a=a||"#fff",r=r||"#fff",n=n||"center";const l=this.height||512,c=l/256*5,f=this.frequencyMin,u=(this.frequencyMax-f)/c,p=this.labelsEl.getContext("2d"),d=window.devicePixelRatio;if(this.labelsEl.height=this.height*h*d,this.labelsEl.width=55*d,p.scale(d,d),p)for(let o=0;o<h;o++){let h;for(p.fillStyle=t,p.fillRect(0,o*l,55,(1+o)*l),p.fill(),h=0;h<=c;h++){p.textAlign=n,p.textBaseline="middle";const t=f+u*h,c=this.freqType(t),d=this.unitType(t),w=16;let b;b=0==h?(1+o)*l+h-10:(1+o)*l-50*h+2,p.fillStyle=r,p.font=s+" "+i,p.fillText(d,w+24,b),p.fillStyle=a,p.font=e+" "+i,p.fillText(c,w,b)}}}resample(t){const e=this.width,s=[],i=1/t.length,a=1/e;let r;for(r=0;r<e;r++){const e=new Array(t[0].length);let n;for(n=0;n<t.length;n++){const s=n*i,o=s+i,h=r*a,l=h+a,c=o<=h||l<=s?0:Math.min(Math.max(o,h),Math.max(l,s))-Math.max(Math.min(o,h),Math.min(l,s));let f;if(c>0)for(f=0;f<t[0].length;f++)null==e[f]&&(e[f]=0),e[f]+=c/a*t[n][f]}const o=new Uint8Array(t[0].length);let h;for(h=0;h<t[0].length;h++)o[h]=e[h];s.push(o)}return s}}return n}));