Clip detection

Author: Andrews54757

chrome/player/ui/audio/AudioChannelMixer.mjs

@@ -102,7 +102,7 @@ export class AudioChannelMixer extends AbstractAudioModule {
       this.renderChannel(this.channelNodes[channel.id], this.mixerChannelElements[channel.id]);
     });
 
-    this.renderChannel(this.masterNodes, this.masterElements);
+    this.renderChannel(this.masterNodes, this.masterElements, true);
 
     this.channelNodes.forEach((nodes, i) => {
       nodes.equalizer.render();
@@ -113,7 +113,7 @@ export class AudioChannelMixer extends AbstractAudioModule {
     this.masterNodes.compressor.render();
   }
 
-  renderChannel(nodes, els) {
+  renderChannel(nodes, els, checkClip = false) {
     const analyzer = nodes ? nodes.analyzer : null;
     if (!analyzer || !els) {
       return;
@@ -135,6 +135,13 @@ export class AudioChannelMixer extends AbstractAudioModule {
     const newvolume = AudioUtils.getVolume(analyzer);
     const volume = Math.max(newvolume, lastVolume - 0.5);
     analyzer._lastVolume = volume;
+
+    if (checkClip && AudioUtils.isClipping(analyzer)) {
+      analyzer._isClippingTime = Date.now();
+    }
+
+    const isClipping = checkClip && analyzer._isClippingTime && (Date.now() - analyzer._isClippingTime < 500);
+
     const rectHeight = height / 50;
 
     const minDb = analyzer.minDecibels;
@@ -157,7 +164,7 @@ export class AudioChannelMixer extends AbstractAudioModule {
       ctx.fillRect(0, y, width, rectHeight);
 
       const color = `rgb(${Utils.clamp(i * 5, 0, 255)}, ${Utils.clamp(255 - i * 5, 0, 255)}, 0)`;
-      ctx.fillStyle = color;
+      ctx.fillStyle = isClipping ? 'rgb(255, 0, 0)' : color;
       ctx.fillRect(0, y + 1, width, rectHeight - 2);
     }
 

chrome/player/utils/AudioUtils.mjs

@@ -63,6 +63,19 @@ function get468WeightsForAnalyser(analyser) {
  * Utility functions for audio processing and conversions.
  */
 export class AudioUtils {
+  static isClipping(analyser) {
+    const bufferLength = analyser.frequencyBinCount;
+    const dataArray = new Uint8Array(bufferLength);
+    analyser.getByteTimeDomainData(dataArray);
+
+    // Check if any sample is at the clipping value (0 or 255)
+    for (let i = 0; i < bufferLength; i++) {
+      if (dataArray[i] === 255) {
+        return true;
+      }
+    }
+    return false;
+  }
   /**
    * Calculates the volume in decibels from an AnalyserNode.
    * @param {AnalyserNode} analyser - The Web Audio analyser node.