Initial commit

assets/bandpass-processor.js

@@ -0,0 +1,67 @@
+class BandpassProcessor extends AudioWorkletProcessor {
+  process (inputs, outputs) {
+    const input = inputs[0]
+    const output = outputs[0]
+    // const frequency = parameters.frequency
+    // const Q = parameters.Q
+
+    for (let channel = 0; channel < input.length; channel++) {
+      const inputChannel = input[channel]
+      //     const outputChannel = output[channel]
+
+      for (let i = 0; i < inputChannel.length; i++) {
+        // Apply bandpass filter to inputChannel[i] and store the result in outputChannel[i]
+        // using the provided frequency and Q parameters
+      }
+    }
+
+    // Calculate the RMS value of the output audio data
+    const rms = this.calculateRMS(output)
+
+    // Calculate the dB values
+    const dbValues = this.convertToDB(output)
+
+    // Calculate the 10th and 90th percentile values
+    const percentile10 = this.calculatePercentile(dbValues, 10)
+    const percentile90 = this.calculatePercentile(dbValues, 90)
+
+    // Send the processed data to the main thread
+    this.port.postMessage({ rms, dbValues, percentile10, percentile90 })
+
+    return true
+  }
+
+  calculateRMS (data) {
+    let sumOfSquares = 0
+    for (let channel = 0; channel < data.length; channel++) {
+      const channelData = data[channel]
+      for (let i = 0; i < channelData.length; i++) {
+        sumOfSquares += channelData[i] * channelData[i]
+      }
+    }
+    const meanSquare = sumOfSquares / (data.length * data[0].length)
+    const rms = Math.sqrt(meanSquare)
+    return rms
+  }
+
+  calculatePercentile (data, percentile) {
+    const sortedData = data.slice().sort((a, b) => a - b)
+    const index = Math.floor((percentile / 100) * sortedData.length)
+    return sortedData[index]
+  }
+
+  convertToDB (data) {
+    const dbValues = []
+    for (let channel = 0; channel < data.length; channel++) {
+      const channelData = data[channel]
+      for (let i = 0; i < channelData.length; i++) {
+        const amplitude = Math.abs(channelData[i])
+        const db = 20 * Math.log10(amplitude + this.minAmplitude)
+        dbValues.push(db)
+      }
+    }
+    return dbValues
+  }
+}
+
+export default registerProcessor('bandpass-processor', BandpassProcessor)