simplify recorder

Sources/Core/AudioFormatConverter.swift

@@ -133,7 +133,8 @@ public class AudioFormatConverter {
     targetFormat.mFramesPerPacket = 1
     targetFormat.mBitsPerChannel = 16
     targetFormat.mChannelsPerFrame = sourceFormat.mChannelsPerFrame
-    targetFormat.mBytesPerFrame = (targetFormat.mBitsPerChannel / 8) * sourceFormat.mChannelsPerFrame
+    targetFormat.mBytesPerFrame =
+      (targetFormat.mBitsPerChannel / 8) * sourceFormat.mChannelsPerFrame
     targetFormat.mBytesPerPacket = targetFormat.mFramesPerPacket * targetFormat.mBytesPerFrame
 
     return try AudioFormatConverter(sourceFormat: sourceFormat, targetFormat: targetFormat)

Sources/Core/AudioRecorder.swift

@@ -5,12 +5,10 @@ import Foundation
 public class AudioRecorder {
   private var deviceID: AudioObjectID
   private var ioProcID: AudioDeviceIOProcID?
-  private var sourceFormat: AudioStreamBasicDescription?
-  private var finalFormat: AudioStreamBasicDescription?
+  private var finalFormat: AudioStreamBasicDescription!
   private var audioBuffer: AudioBuffer?
   private var outputHandler: AudioOutputHandler
   private var converter: AudioFormatConverter?
-  private var chunkDuration: Double
 
   init(
     deviceID: AudioObjectID, outputHandler: AudioOutputHandler, convertToSampleRate: Double? = nil,
@@ -18,11 +16,12 @@ public class AudioRecorder {
   ) {
     self.deviceID = deviceID
     self.outputHandler = outputHandler
-    self.chunkDuration = chunkDuration
 
     // Get source format and set up conversion if requested
     let sourceFormat = AudioFormatManager.getDeviceFormat(deviceID: deviceID)
-    self.sourceFormat = sourceFormat
+
+    // Set up the audio buffer using source format and configurable chunk duration
+    self.audioBuffer = AudioBuffer(format: sourceFormat, chunkDuration: chunkDuration)
 
     if let targetSampleRate = convertToSampleRate {
       // Validate sample rate
@@ -55,20 +54,12 @@ public class AudioRecorder {
   func startRecording() {
     Logger.debug("Starting audio recording")
 
-    guard let sourceFormat = sourceFormat, let finalFormat = finalFormat else {
-      fatalError("Audio formats not initialized")
-    }
-
-    // Set up the audio buffer using source format and configurable chunk duration
-    self.audioBuffer = AudioBuffer(format: sourceFormat, chunkDuration: chunkDuration)
-
-    // Log format info and send metadata for FINAL format
+    // Log format info and send metadata for final format
     AudioFormatManager.logFormatInfo(finalFormat)
     let metadata = AudioFormatManager.createMetadata(for: finalFormat)
     outputHandler.handleMetadata(metadata)
     outputHandler.handleStreamStart()
 
-    // Set up and start the IO proc
     setupAndStartIOProc()
 
     Logger.info("Audio device started successfully")
@@ -116,24 +107,23 @@ public class AudioRecorder {
     let audioData = Data(bytes: firstBuffer.mData!, count: Int(firstBuffer.mDataByteSize))
     audioBuffer?.append(audioData)
 
-    // Process and send complete chunks, applying conversion if needed
-    audioBuffer?.processChunks().forEach { packet in
-      let processedPacket = converter?.transform(packet) ?? packet
-      outputHandler.handleAudioPacket(processedPacket)
-    }
+    processAudioBuffer()
 
     return noErr
   }
 
   func stopRecording() {
-    // Send any remaining buffered audio, applying conversion if needed
+    processAudioBuffer()
+    outputHandler.handleStreamStop()
+    cleanupIOProc()
+  }
+
+  private func processAudioBuffer() {
+    // Process and send complete chunks, applying conversion if needed
     audioBuffer?.processChunks().forEach { packet in
       let processedPacket = converter?.transform(packet) ?? packet
       outputHandler.handleAudioPacket(processedPacket)
     }
-
-    outputHandler.handleStreamStop()
-    cleanupIOProc()
   }
 
   private func cleanupIOProc() {

Sources/Core/AudioTapManager.swift

@@ -7,10 +7,6 @@ class AudioTapManager {
   private var tapID: AudioObjectID?
   private var deviceID: AudioObjectID?
 
-  init() {
-    // Empty init - setup happens in setupAudioTap()
-  }
-
   deinit {
     Logger.debug("Cleaning up audio tap manager")
 
@@ -48,10 +44,8 @@ class AudioTapManager {
 
   private func createSystemAudioTap(with config: TapConfiguration) throws -> AudioObjectID {
     Logger.debug("Creating tap description")
-    // Create a tap description
     let description = CATapDescription()
 
-    // Configure the tap to capture all system audio
     description.name = "audiotee-tap"
     description.processes = try translatePIDsToProcessObjects(config.processes)  // Properly translate PIDs
     description.isPrivate = true
@@ -67,9 +61,7 @@ class AudioTapManager {
       context: [
         "name": description.name,
         "processes": String(describing: config.processes),
-        "private": String(description.isPrivate),
         "mute": String(describing: description.muteBehavior),
-        "mixdown": String(description.isMixdown),
         "mono": String(description.isMono),
         "exclusive": String(description.isExclusive),
       ])

Sources/Output/Handlers/BinaryOutputHandler.swift

@@ -1,10 +1,8 @@
 import Foundation
 
-/// Binary output with JSON headers (pipe-optimised)
 public class BinaryAudioOutputHandler: AudioOutputHandler {
-  public init() {}
-
   public func handleAudioPacket(_ packet: AudioPacket) {
+    // TODO: should we use a DispatchQueue instead of writing directly?
     // Write raw binary audio data directly to stdout
     FileHandle.standardOutput.write(packet.data)
   }