tor-browser

silence-detector.js (1389B)

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// AudioWorkletProcessor that detects silence and notifies the main thread on state change.
class SilenceDetector extends AudioWorkletProcessor {
 constructor() {
   super();
   // Assume silence and no input until the first buffer is processed.
   this.isSilent = true;
   this.hasInput = false;
 }

 process(inputs, outputs, parameters) {
   const input = inputs[0];
   const currentHasInput = input && input.length > 0;

   // Detect silence state (no input counts as silence)
   let isCurrentlySilent = true;
   if (currentHasInput) {
     const channel = input[0];
     for (let i = 0; i < channel.length; i++) {
       if (channel[i] !== 0) {
         isCurrentlySilent = false;
         break;
       }
     }
   }

   // Check if state changed
   const hasInputChanged = this.hasInput !== currentHasInput;
   const isSilentChanged = this.isSilent !== isCurrentlySilent;

   // Update state
   this.hasInput = currentHasInput;
   this.isSilent = isCurrentlySilent;

   // Send notifications
   if (hasInputChanged || isSilentChanged) {
     this.port.postMessage({
       type: "stateChanged",
       isSilent: this.isSilent,
       hasInput: this.hasInput,
       hasInputChanged: hasInputChanged,
       isSilentChanged: isSilentChanged,
     });
   }

   return currentHasInput;
 }
}

registerProcessor("silence-detector", SilenceDetector);