AudioTee Swift CLI repo

Sources/Core/AudioBuffer.swift

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+import CoreAudio
+import Foundation
+
+public class AudioBuffer {
+  private var buffer = Data()
+  private let targetChunkDuration: Double
+  private let streamFormat: AudioStreamBasicDescription
+
+  public init(format: AudioStreamBasicDescription, chunkDuration: Double = 0.2) {
+    self.streamFormat = format
+    self.targetChunkDuration = chunkDuration
+  }
+
+  public func append(_ data: Data) {
+    buffer.append(data)
+  }
+
+  public func processChunks() -> [AudioPacket] {
+    var packets: [AudioPacket] = []
+
+    while let packet = nextChunk() {
+      packets.append(packet)
+    }
+
+    return packets
+  }
+
+  public func flushRemaining() -> AudioPacket? {
+    guard !buffer.isEmpty else { return nil }
+
+    let packet = AudioPacket(
+      timestamp: Date(),
+      duration: 0.0,  // Unknown duration for final chunk
+      peakAmplitude: 0.0,
+      rawAudioData: buffer
+    )
+
+    buffer.removeAll()
+    return packet
+  }
+
+  private func nextChunk() -> AudioPacket? {
+    let bytesPerFrame = Int(streamFormat.mBytesPerFrame)
+    let samplesPerChunk = Int(streamFormat.mSampleRate * targetChunkDuration)
+    let bytesPerChunk = samplesPerChunk * bytesPerFrame
+
+    guard buffer.count >= bytesPerChunk else { return nil }
+
+    let chunkData = buffer.prefix(bytesPerChunk)
+
+    let packet = AudioPacket(
+      timestamp: Date(),
+      duration: Double(samplesPerChunk) / streamFormat.mSampleRate,
+      peakAmplitude: 0.0,  // No analysis in raw mode
+      rawAudioData: Data(chunkData)
+    )
+
+    buffer.removeFirst(bytesPerChunk)
+    return packet
+  }
+}