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wavesurfer.js

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Audio waveform player

wavesurfer.xyz

katspaugh/wavesurfer.js

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values");return e}const t=p[e];if(!t)throw Error("No such colormap '"+e+"'");return t()}(e.colorMap),this.fftSamples=e.fftSamples||512,this.height=e.height||200,this.noverlap=e.noverlap||null,this.windowFunc=e.windowFunc||"hann",this.alpha=e.alpha,this.frequencyMin=e.frequencyMin||0,this.frequencyMax=e.frequencyMax||0,this.gainDB=null!==(t=e.gainDB)&&void 0!==t?t:20,this.rangeDB=null!==(s=e.rangeDB)&&void 0!==s?s:80,this.scale=e.scale||"mel",this.numMelFilters=this.fftSamples/2,this.numLogFilters=this.fftSamples/2,this.numBarkFilters=this.fftSamples/2,this.numErbFilters=this.fftSamples/2,e.maxCanvasWidth&&(k.MAX_CANVAS_WIDTH=e.maxCanvasWidth),this.renderThrottleMs=50,this.zoomThreshold=.05,this.createWrapper(),this.createCanvas(),this.useWebWorker&&this.initializeWorker()}initializeWorker(){if("undefined"!=typeof window&&"undefined"!=typeof Worker)try{this.worker=new T,this.worker.onmessage=e=>{const{type:t,id:s,result:i,error:r}=e.data;if("frequenciesResult"===t){const 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this._onReady&&this.wavesurfer.un("ready",this._onReady),"function"==typeof this._onRender&&this.wavesurfer.un("redraw",this._onRender)),this.renderTimeout&&(clearTimeout(this.renderTimeout),this.renderTimeout=null),this.scrollUnsubscribe&&(this.scrollUnsubscribe(),this.scrollUnsubscribe=null),this.pendingBitmaps.clear(),this.worker&&(this.worker.terminate(),this.worker=null),this.cachedFrequencies=null,this.cachedResampledData=null,this.cachedBuffer=null,this.clearCanvases(),this.canvasContainer&&(this.canvasContainer.remove(),this.canvasContainer=null),this.wrapper&&(this.wrapper.remove(),this.wrapper=null),this.labelsEl&&(this.labelsEl.remove(),this.labelsEl=null),this.container=null,this.isRendering=!1,this.lastZoomLevel=0,this.wavesurfer=null,this.util=null,this.options=null,super.destroy()}loadFrequenciesData(t){return e(this,void 0,void 0,(function*(){const e=yield fetch(t);if(!e.ok)throw new Error("Unable to fetch frequencies data");const s=yield e.json();this.drawSpectrogram(s)}))}getFrequenciesData(){return e(this,void 0,void 0,(function*(){var e;const t=null===(e=this.wavesurfer)||void 0===e?void 0:e.getDecodedData();if(!t)return null;if(this.cachedBuffer===t&&this.cachedFrequencies)return this.cachedFrequencies;{const e=yield this.getFrequencies(t);return this.cachedFrequencies=e,this.cachedBuffer=t,e}}))}clearCache(){this.cachedFrequencies=null,this.cachedResampledData=null,this.cachedBuffer=null,this.cachedWidth=0,this.lastZoomLevel=0}createWrapper(){var e,t;this.wrapper=M("div",{style:{display:"block",position:"relative",userSelect:"none"}}),this.options.labels&&(this.labelsEl=M("canvas",{part:"spec-labels",style:{position:"absolute",zIndex:9,width:"55px",height:"100%"}},this.wrapper)),this._onWrapperClick=(e=this.wrapper,t=this.emit.bind(this),s=>{const 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0:e.options.minPxPerSec)||0;Math.abs(t-this.lastZoomLevel)/Math.max(t,this.lastZoomLevel,1)<this.zoomThreshold&&this.cachedFrequencies?this.renderTimeout=window.setTimeout((()=>{this.fastRender()}),this.renderThrottleMs):this.renderTimeout=window.setTimeout((()=>{this.render()}),this.renderThrottleMs)}render(){return e(this,void 0,void 0,(function*(){var e,t;if(!this.isRendering){this.isRendering=!0;try{if(this.frequenciesDataUrl)yield this.loadFrequenciesData(this.frequenciesDataUrl);else{if(null===(e=this.wavesurfer)||void 0===e?void 0:e.getDecodedData()){yield this.getFrequenciesData();this.drawSpectrogram(this.cachedFrequencies)}}this.lastZoomLevel=(null===(t=this.wavesurfer)||void 0===t?void 0:t.options.minPxPerSec)||0}finally{this.isRendering=!1}}}))}fastRender(){var e;if(!this.isRendering&&this.cachedFrequencies){this.isRendering=!0;try{this.drawSpectrogram(this.cachedFrequencies),this.lastZoomLevel=(null===(e=this.wavesurfer)||void 0===e?void 0:e.options.minPxPerSec)||0}finally{this.isRendering=!1}}}drawSpectrogram(e){var t,s,i;isNaN(e[0][0])||(e=[e]),this.clearCanvases();const r=this.height*e.length;this.wrapper.style.height=r+"px";const n=this.getWidth(),a=Math.min(k.MAX_CANVAS_WIDTH,n);if(0===n||0===r)return;const l=Math.ceil(n/a);let o;const h=(null===(t=e[0])||void 0===t?void 0:t.length)||0;n!==h?this.cachedResampledData&&this.cachedWidth===n?o=this.cachedResampledData:(o=this.efficientResample(e,n),this.cachedResampledData=o,this.cachedWidth=n):o=e;const c=(null===(s=this.buffer)||void 0===s?void 0:s.sampleRate)?this.buffer.sampleRate/2:(this.options.sampleRate||0)/2,d=this.frequencyMin,u=this.frequencyMax,p=u>c,m=p?this.colorMap[this.colorMap.length-1]:null,f=e=>{if(e<0||e>=l)return;if(this.drawnCanvases[e])return;this.drawnCanvases[e]=!0;const t=e*a,s=Math.min(a,n-t);if(s<=0)return;const i=this.createSingleCanvas(s,r,t);this.canvases.push(i);const h=i.getContext("2d");if(h){p&&m&&(h.fillStyle=`rgba(${255*m[0]}, ${255*m[1]}, ${255*m[2]}, ${m[3]})`,h.fillRect(0,0,s,r));for(let e=0;e<o.length;e++)this.drawSpectrogramSegment(o[e],h,s,this.height,e*this.height,t,n,c,d,u)}};if(this.isScrollable=n>this.getWrapperWidth(),this.scrollUnsubscribe&&(this.scrollUnsubscribe(),this.scrollUnsubscribe=null),!this.isScrollable||l<=3)for(let e=0;e<l;e++)f(e);else{const e=()=>{var e;const t=null===(e=this.wavesurfer)||void 0===e?void 0:e.getWrapper();if(!t)return;const s=t.scrollLeft||0,i=t.clientWidth||0,r=Math.max(0,s-.5*i),a=Math.min(n,s+1.5*i),o=Math.floor(r/n*l),h=Math.min(Math.ceil(a/n*l),l-1);Object.keys(this.drawnCanvases).length>k.MAX_NODES&&this.clearExcessCanvases();for(let e=o;e<=h;e++)f(e)};e();let t=null;const s=()=>{t&&clearTimeout(t),t=window.setTimeout(e,16)},r=null===(i=this.wavesurfer)||void 0===i?void 0:i.getWrapper();r&&(r.addEventListener("scroll",s,{passive:!0}),this.scrollUnsubscribe=()=>{r.removeEventListener("scroll",s),t&&clearTimeout(t)})}this.options.labels&&this.loadLabels(this.options.labelsBackground,"12px","12px","",this.options.labelsColor,this.options.labelsHzColor||this.options.labelsColor,"center","#specLabels",e.length),this.emit("ready")}drawSpectrogramSegment(e,t,s,i,r,n,a,l,o,h){const d=e[0].length,u=Math.floor(n/a*e.length),p=Math.min(Math.ceil((n+s)/a*e.length),e.length),m=e.slice(u,p);if(0===m.length)return;const f=m.length,b=new ImageData(f,d),w=b.data;this.fillImageDataQuality(w,m,f,d);const y=c(o,this.scale)/c(l,this.scale),v=c(h,this.scale)/c(l,this.scale),g=Math.min(1,v),M=createImageBitmap(b,0,Math.round(d*(1-g)),f,Math.round(d*(g-y)));this.pendingBitmaps.add(M),M.then((e=>{if(this.pendingBitmaps.delete(M),t.canvas.parentNode){const n=i*g/v,a=r+i*(1-g/v);t.drawImage(e,0,a,s,n),"close"in e&&e.close()}})).catch((e=>{this.pendingBitmaps.delete(M)}))}getWidth(){return this.wavesurfer.getWrapper().offsetWidth}getWrapperWidth(){var e,t;return(null===(t=null===(e=this.wavesurfer)||void 0===e?void 0:e.getWrapper())||void 0===t?void 0:t.clientWidth)||0}calculateFrequenciesWithWorker(t){return e(this,void 0,void 0,(function*(){var e,s;if(!this.worker)throw new Error("Worker not available");const i=this.fftSamples,r=(null!==(e=this.options.splitChannels)&&void 0!==e?e:null===(s=this.wavesurfer)||void 0===s?void 0:s.options.splitChannels)?t.numberOfChannels:1;let n=this.noverlap;if(!n){const e=this.getWidth(),s=t.length/e;n=Math.max(0,Math.round(i-s))}const a=[];for(let e=0;e<r;e++)a.push(t.getChannelData(e));const l=`${Date.now()}_${Math.random()}`,o=new Promise(((e,t)=>{this.workerPromises.set(l,{resolve:e,reject:t}),setTimeout((()=>{this.workerPromises.has(l)&&(this.workerPromises.delete(l),t(new Error("Worker timeout")))}),3e4)}));return this.worker.postMessage({type:"calculateFrequencies",id:l,audioData:a,options:{startTime:0,endTime:t.duration,sampleRate:t.sampleRate,fftSamples:this.fftSamples,windowFunc:this.windowFunc,alpha:this.alpha,noverlap:n,scale:this.scale,gainDB:this.gainDB,rangeDB:this.rangeDB,splitChannels:this.options.splitChannels||!1}}),o}))}getFrequencies(t){return e(this,void 0,void 0,(function*(){var e,c;if(this.frequencyMax=this.frequencyMax||t.sampleRate/2,this.buffer=t,!t)return[];if(this.useWebWorker&&this.worker)try{return yield this.calculateFrequenciesWithWorker(t)}catch(e){console.warn("Worker calculation failed, falling back to main thread:",e)}const p=this.fftSamples,m=(null!==(e=this.options.splitChannels)&&void 0!==e?e:null===(c=this.wavesurfer)||void 0===c?void 0:c.options.splitChannels)?t.numberOfChannels:1,f=t.sampleRate,b=[];let y=this.noverlap;if(!y){const e=this.getWidth(),s=t.length/e;y=Math.max(0,Math.round(p-s))}let v=y||Math.max(0,Math.round(.5*p));const g=.5*p;v=Math.min(v,g);const M=Math.max(64,.25*p),W=Math.max(M,p-v),Z=new w(p,f,this.windowFunc,this.alpha),x=this.fftSamples/2,S=function(e,t,c,u){switch(e){case"mel":return d(t,c,u,s,i);case"logarithmic":return d(t,c,u,r,n);case"bark":return d(t,c,u,a,l);case"erb":return d(t,c,u,o,h);default:return null}}(this.scale,x,this.fftSamples,f);for(let e=0;e<m;e++){const s=t.getChannelData(e),i=[];for(let e=0;e+p<s.length;e+=W){const t=s.slice(e,e+p);let r=Z.calculateSpectrum(t);S&&(r=u(r,S));const n=new Uint8Array(r.length),a=this.gainDB+this.rangeDB;for(let e=0;e<r.length;e++){const t=r[e]>1e-12?r[e]:1e-12,s=20*Math.log10(t);s<-a?n[e]=0:s>-this.gainDB?n[e]=255:n[e]=Math.round((s+this.gainDB)/this.rangeDB*255)}i.push(n)}b.push(i)}return b}))}loadLabels(e,t,s,i,r,n,a,l,o){e=e||"rgba(68,68,68,0)",t=t||"12px",s=s||"12px",i=i||"Helvetica",r=r||"#fff",n=n||"#fff",a=a||"center";const h=this.height||512,c=h/256*5;this.frequencyMin;this.frequencyMax;const d=this.labelsEl.getContext("2d"),u=window.devicePixelRatio;if(this.labelsEl.height=this.height*o*u,this.labelsEl.width=55*u,d.scale(u,u),d)for(let l=0;l<o;l++){let o;for(d.fillStyle=e,d.fillRect(0,l*h,55,(1+l)*h),d.fill(),o=0;o<=c;o++){d.textAlign=a,d.textBaseline="middle";const e=b(o,c,this.frequencyMin,this.frequencyMax,this.scale),u=m(e),p=f(e),w=16;let y=(1+l)*h-o/c*h;y=Math.min(Math.max(y,l*h+10),(1+l)*h-10),d.fillStyle=n,d.font=s+" "+i,d.fillText(p,w+24,y),d.fillStyle=r,d.font=t+" "+i,d.fillText(u,w,y)}}}efficientResample(e,t){return e.map((e=>this.resampleChannel(e,t)))}resampleChannel(e,t){var s;const i=e.length,r=(null===(s=e[0])||void 0===s?void 0:s.length)||0;if(i===t||0===t)return e;const n=i/t,a=new Array(t);if(n>=1)for(let s=0;s<t;s++){const t=Math.floor(s*n),l=Math.min(Math.ceil((s+1)*n),i),o=l-t,h=new Uint8Array(r);if(1===o)h.set(e[t]);else for(let s=0;s<r;s++){let i=0;for(let r=t;r<l;r++)i+=e[r][s];h[s]=Math.round(i/o)}a[s]=h}else for(let s=0;s<t;s++){const t=s*n,l=Math.floor(t),o=Math.min(l+1,i-1),h=t-l,c=new Uint8Array(r);if(0===h||l===o)c.set(e[l]);else{const t=e[l],s=e[o],i=1-h;for(let e=0;e<r;e++)c[e]=Math.round(t[e]*i+s[e]*h)}a[s]=c}return a}fillImageDataQuality(e,t,s,i){const r=this.colorMap;for(let n=0;n<s;n++){const a=t[n];for(let t=0;t<i;t++){const l=r[a[t]],o=4*((i-t-1)*s+n);e[o]=255*l[0],e[o+1]=255*l[1],e[o+2]=255*l[2],e[o+3]=255*l[3]}}}}return k.MAX_CANVAS_WIDTH=3e4,k.MAX_NODES=10,k}));