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wavesurfer.js

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Audio waveform player

wavesurfer.xyz

katspaugh/wavesurfer.js

2 lines (1 loc) • 36.4 kB
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e,t;this.wrapper=r("div",{style:{display:"block",position:"relative",userSelect:"none"}}),this.options.labels&&(this.labelsEl=r("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 i=e.getBoundingClientRect(),r=s.clientX-i.left,n=i.width;t("click",r/n)}),this.wrapper.addEventListener("click",this._onWrapperClick)}createCanvas(){this.canvasContainer=r("div",{style:{position:"absolute",left:0,top:0,width:"100%",height:"100%",zIndex:4}},this.wrapper)}handleRedraw(){const e=this.pixelsPerSecond;this.pixelsPerSecond=this.getPixelsPerSecond(),e!==this.pixelsPerSecond&&this.segments.size>0&&this.updateSegmentPositions(e,this.pixelsPerSecond),this.scheduleRender()}updateSegmentPositions(e,t){for(const e of this.segments.values())if(e.startPixel=e.startTime*t,e.endPixel=e.endTime*t,e.canvas){const 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document.documentElement.scrollLeft;if(document.body.scrollLeft)return document.body.scrollLeft;if(window.scrollX)return window.scrollX;if(window.pageXOffset)return window.pageXOffset;let s=e.parentElement;for(;s;){const e=window.getComputedStyle(s);if(("scroll"===e.overflowX||"auto"===e.overflowX)&&s.scrollLeft>0)return s.scrollLeft;s=s.parentElement}return 0}getViewportWidth(e){var t,s;const i=e.offsetWidth||e.clientWidth,r=(null===(t=e.parentElement)||void 0===t?void 0:t.offsetWidth)||(null===(s=e.parentElement)||void 0===s?void 0:s.clientWidth),n=window.innerWidth;return r&&r<i?r:Math.min(i||800,.8*n)}handleScroll(){var e,t;const s=null===(e=this.wavesurfer)||void 0===e?void 0:e.getWrapper();let i=0;if(null==s?void 0:s.scrollLeft)i=s.scrollLeft;else if(null===(t=null==s?void 0:s.parentElement)||void 0===t?void 0:t.scrollLeft)i=s.parentElement.scrollLeft;else if(document.documentElement.scrollLeft||document.body.scrollLeft)i=document.documentElement.scrollLeft||document.body.scrollLeft;else if(window.scrollX||window.pageXOffset)i=window.scrollX||window.pageXOffset;else if(s){let e=s.parentElement;for(;e&&0===i;){const t=window.getComputedStyle(e);if(("scroll"===t.overflowX||"auto"===t.overflowX)&&e.scrollLeft>0){i=e.scrollLeft;break}e=e.parentElement}}this.getPixelsPerSecond(),this.scheduleRender()}updatePosition(e){this.currentPosition=e,this.scheduleRender()}scheduleRender(){this.renderTimeout&&clearTimeout(this.renderTimeout),this.renderTimeout=window.setTimeout((()=>{this.renderVisibleWindow()}),16)}renderVisibleWindow(){return e(this,void 0,void 0,(function*(){var e;if(!this.isRendering&&this.buffer){this.isRendering=!0;try{const t=null===(e=this.wavesurfer)||void 0===e?void 0:e.getWrapper();if(!t)return;const s=this.getScrollLeft(t),i=this.getViewportWidth(t),r=this.getPixelsPerSecond(),n=(this.buffer.duration,s/r),o=(s+i)/r,l=o-n;let a=Math.min(2,.5*l);l>30&&(console.warn(`⚠️ Large visible duration: ${l.toFixed(1)}s - limiting buffer`),a=1);const h=Math.max(0,n-a),c=Math.min(this.buffer.duration,o+a);yield this.generateSegments(h,c)}finally{this.isRendering=!1}}}))}generateSegments(t,s){return e(this,void 0,void 0,(function*(){if(!this.buffer)return;const e=this.getPixelsPerSecond(),i=this.getWidth(),r=this.buffer.duration,n=this.isProgressiveLoading&&s-t<=35,o=!n&&r*e<=i&&r<=60;let l,a;if(n?(a=s-t,l=a*e):o?(l=i,a=r):(l=15e3,a=l/e),this.segments.size>0)for(const[e,t]of this.segments);const h=this.findUncoveredTimeRanges(t,s,a);if(0!==h.length){for(const t of h)for(let s=t.start;s<t.end;s+=a){const r=s,n=Math.min(s+a,t.end,this.buffer.duration),l=`${Math.floor(10*r)}_${Math.floor(10*n)}`;if(this.segments.has(l))continue;performance.now();const h=yield this.calculateFrequencies(r,n);if(performance.now(),h&&h.length>0){const t={startTime:r,endTime:n,startPixel:o?0:r*e,endPixel:o?i:n*e,frequencies:h};this.segments.set(l,t),performance.now(),yield this.renderSegment(t),performance.now(),this.emitProgress()}}this.isProgressiveLoading||this.startProgressiveLoading()}}))}findUncoveredTimeRanges(e,t,s){const i=Array.from(this.segments.values()).sort(((e,t)=>e.startTime-t.startTime)),r=[];let n=e;for(const e of i){if(n<e.startTime&&n<t){const s=Math.min(e.startTime,t);r.push({start:n,end:s})}if(n=Math.max(n,e.endTime),n>=t)break}return n<t&&r.push({start:n,end:t}),r}startProgressiveLoading(){!this.isProgressiveLoading&&this.buffer&&this.progressiveLoading&&(this.isProgressiveLoading=!0,this.nextProgressiveSegmentTime=0,this.progressiveLoadTimeout=window.setTimeout((()=>{this.progressiveLoadNextSegment()}),1e3))}progressiveLoadNextSegment(){return e(this,void 0,void 0,(function*(){if(!this.buffer||!this.isProgressiveLoading)return;const e=this.buffer.duration;if(this.nextProgressiveSegmentTime>=e)return void this._stopProgressiveLoading();const t=this.nextProgressiveSegmentTime,s=Math.min(t+30,e),i=`${Math.floor(10*t)}_${Math.floor(10*s)}`;if(!this.segments.has(i))try{yield this.generateSegments(t,s)}catch(e){return console.warn("Progressive loading failed:",e),void this._stopProgressiveLoading()}this.nextProgressiveSegmentTime=s,this.progressiveLoadTimeout=window.setTimeout((()=>{this.progressiveLoadNextSegment()}),2e3)}))}_stopProgressiveLoading(){this.isProgressiveLoading=!1,this.progressiveLoadTimeout&&(clearTimeout(this.progressiveLoadTimeout),this.progressiveLoadTimeout=null)}getLoadingProgress(){if(!this.buffer)return 0;const e=this.buffer.duration;if(0===e)return 100;if(!this.isProgressiveLoading&&0===this.segments.size)return 0;const t=Math.min(100,this.nextProgressiveSegmentTime/e*100);return!this.isProgressiveLoading&&this.nextProgressiveSegmentTime>=e?100:t}emitProgress(){const e=this.getLoadingProgress()/100;this.emit("progress",e)}calculateFrequencies(t,s){return e(this,void 0,void 0,(function*(){if(!this.buffer)return[];const e=performance.now();if(this.buffer.sampleRate,!this.options.splitChannels||this.buffer.numberOfChannels,this.worker)try{const e=yield this.calculateFrequenciesWithWorker(t,s);performance.now();return e}catch(e){console.warn("Worker calculation failed, falling back to main thread:",e)}return this.calculateFrequenciesMainThread(t,s)}))}calculateFrequenciesWithWorker(t,s){return e(this,void 0,void 0,(function*(){if(!this.buffer||!this.worker)throw new Error("Worker not available");const e=this.buffer.sampleRate,i=this.options.splitChannels?this.buffer.numberOfChannels:1;let r=this.noverlap;if(!r){const i=(s-t)*this.getPixelsPerSecond(),n=Math.floor(t*e),o=(Math.floor(s*e)-n)/i;r=Math.max(0,Math.round(this.fftSamples-o))}const n=[];for(let e=0;e<i;e++)n.push(this.buffer.getChannelData(e));const o=`${Date.now()}_${Math.random()}`,l=new Promise(((e,t)=>{this.workerPromises.set(o,{resolve:e,reject:t}),setTimeout((()=>{this.workerPromises.has(o)&&(this.workerPromises.delete(o),t(new Error("Worker timeout")))}),3e4)}));return this.worker.postMessage({type:"calculateFrequencies",id:o,audioData:n,options:{startTime:t,endTime:s,sampleRate:e,fftSamples:this.fftSamples,windowFunc:this.windowFunc,alpha:this.alpha,noverlap:r,scale:this.scale,gainDB:this.gainDB,rangeDB:this.rangeDB,splitChannels:this.options.splitChannels||!1}}),l}))}calculateFrequenciesMainThread(t,s){return e(this,void 0,void 0,(function*(){if(!this.buffer)return[];const e=this.buffer.sampleRate,i=Math.floor(t*e),r=Math.floor(s*e),n=this.options.splitChannels?this.buffer.numberOfChannels:1;this.fft||(this.fft=new w(this.fftSamples,e,this.windowFunc,this.alpha));let o=this.noverlap;if(!o){const e=(r-i)/((s-t)*this.getPixelsPerSecond());o=Math.max(0,Math.round(this.fftSamples-e))}const l=.5*this.fftSamples;o=Math.min(o,l);const a=Math.max(64,.25*this.fftSamples),h=Math.max(a,this.fftSamples-o),c=[];performance.now();for(let t=0;t<n;t++){const s=this.buffer.getChannelData(t),n=[];for(let t=i;t+this.fftSamples<r;t+=h){const i=s.slice(t,t+this.fftSamples);let r=this.fft.calculateSpectrum(i);const o=this.getFilterBank(e);o&&(r=g(r,o));const l=new Uint8Array(r.length),a=this.gainDB+this.rangeDB;for(let e=0;e<r.length;e++){const t=r[e]>1e-12?r[e]:1e-12,s=20*Math.log10(t);s<-a?l[e]=0:s>-this.gainDB?l[e]=255:l[e]=Math.round((s+this.gainDB)/this.rangeDB*255)}n.push(l)}c.push(n)}return performance.now(),c}))}renderSegment(t){return e(this,void 0,void 0,(function*(){var e;const s=t.endPixel-t.startPixel,i=this.height*t.frequencies.length,r=document.createElement("canvas");r.width=Math.round(s),r.height=Math.round(i),r.style.position="absolute",r.style.left=`${t.startPixel}px`,r.style.top="0",r.style.width=`${s}px`,r.style.height=`${i}px`;const n=r.getContext("2d");if(!n)return;const o=(null===(e=this.buffer)||void 0===e?void 0:e.sampleRate)?this.buffer.sampleRate/2:0,l=this.frequencyMin,a=this.frequencyMax||o;for(let e=0;e<t.frequencies.length;e++)yield this.renderChannelToCanvas(t.frequencies[e],n,s,this.height,e*this.height,o,l,a);t.canvas=r,this.canvasContainer.appendChild(r)}))}renderChannelToCanvas(t,s,i,r,n,o,l,a){return e(this,void 0,void 0,(function*(){if(0===t.length)return;const e=t[0].length,h=new ImageData(t.length,e),c=h.data;for(let s=0;s<t.length;s++){const i=t[s];for(let r=0;r<e;r++){const n=Math.min(255,Math.max(0,i[r])),o=this.colorMap[n],l=4*((e-r-1)*t.length+s);c[l]=255*o[0],c[l+1]=255*o[1],c[l+2]=255*o[2],c[l+3]=255*o[3]}}const d=m(l,this.scale)/m(o,this.scale),u=m(a,this.scale)/m(o,this.scale),f=Math.min(1,u),p=r*f/u,g=n+r*(1-f/u),b=Math.round(e*(1-f)),w=Math.round(e*(f-d)),v=yield createImageBitmap(h,0,b,t.length,w);s.drawImage(v,0,g,i,p),"close"in v&&v.close()}))}clearAllSegments(){for(const e of this.segments.values())e.canvas&&e.canvas.remove();this.segments.clear()}getFilterBank(e){const t=this.fftSamples/2;return function(e,t,s,i){switch(e){case"mel":return p(t,s,i,o,l);case"logarithmic":return p(t,s,i,a,h);case"bark":return p(t,s,i,c,d);case"erb":return p(t,s,i,u,f);default:return null}}(this.scale,t,this.fftSamples,e)}freqType(e){return e>=1e3?(e/1e3).toFixed(1):Math.round(e)}unitType(e){return e>=1e3?"kHz":"Hz"}getLabelFrequency(e,t){const s=m(this.frequencyMin,this.scale);return function(e,t){switch(t){case"mel":return l(e);case"logarithmic":return h(e);case"bark":return d(e);case"erb":return f(e);default:return e}}(s+e/t*(m(this.frequencyMax,this.scale)-s),this.scale)}loadLabels(e,t,s,i,r,n,o,l,a){e=e||"rgba(68,68,68,0)",t=t||"12px",s=s||"12px",i=i||"Helvetica",r=r||"#fff",n=n||"#fff",o=o||"center";const h=this.height||512,c=h/256*5;this.frequencyMin;const d=this.labelsEl.getContext("2d"),u=window.devicePixelRatio;if(this.labelsEl.height=this.height*a*u,this.labelsEl.width=55*u,d.scale(u,u),d)for(let l=0;l<a;l++){let a;for(d.fillStyle=e,d.fillRect(0,l*h,55,(1+l)*h),d.fill(),a=0;a<=c;a++){d.textAlign=o,d.textBaseline="middle";const e=this.getLabelFrequency(a,c),u=this.freqType(e),f=this.unitType(e),m=16;let p=(1+l)*h-a/c*h;p=Math.min(Math.max(p,l*h+10),(1+l)*h-10),d.fillStyle=n,d.font=s+" "+i,d.fillText(f,m+24,p),d.fillStyle=r,d.font=t+" "+i,d.fillText(u.toString(),m,p)}}}render(t){return e(this,void 0,void 0,(function*(){this.buffer=t,this.pixelsPerSecond=this.getPixelsPerSecond(),this.frequencyMax=this.frequencyMax||t.sampleRate/2;const e=this.options.splitChannels?t.numberOfChannels:1;this.wrapper.style.height=this.height*e+"px",this.clearAllSegments(),this.nextProgressiveSegmentTime=0,this.options.labels&&this.loadLabels(this.options.labelsBackground,"12px","12px","",this.options.labelsColor,this.options.labelsHzColor||this.options.labelsColor,"center","#specLabels",e),this.scheduleRender(),this.emit("ready")}))}destroy(){this.unAll(),this.renderTimeout&&(clearTimeout(this.renderTimeout),this.renderTimeout=null),this.qualityUpdateTimeout&&(clearTimeout(this.qualityUpdateTimeout),this.qualityUpdateTimeout=null),this.stopProgressiveLoading(),this.nextProgressiveSegmentTime=0,this.worker&&(this.worker.terminate(),this.worker=null);for(const[e,t]of this.workerPromises)t.reject(new Error("Plugin destroyed"));this.workerPromises.clear(),this.clearAllSegments(),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.buffer=null,this.fft=null,this.isRendering=!1,this.currentPosition=0,this.pixelsPerSecond=0,super.destroy()}getWidth(){var e,t;return(null===(t=null===(e=this.wavesurfer)||void 0===e?void 0:e.getWrapper())||void 0===t?void 0:t.offsetWidth)||0}getPixelsPerSecond(){var e;const t=null===(e=this.wavesurfer)||void 0===e?void 0:e.options.minPxPerSec;if(t&&t>0)return t;if(this.buffer){const e=this.getWidth(),t=e>0?e/this.buffer.duration:100;return Math.max(t,50)}return 50}stopProgressiveLoading(){this.isProgressiveLoading=!1,this.progressiveLoadTimeout&&(clearTimeout(this.progressiveLoadTimeout),this.progressiveLoadTimeout=null)}restartProgressiveLoading(){this.stopProgressiveLoading(),this.nextProgressiveSegmentTime=0,this.progressiveLoading&&this.startProgressiveLoading()}}export{W as default};