HomeViewModel extension ShazamKit

HomeViewModel.swift

// MARK: Audio Recognition
extension HomeViewModel {
  // 1
  private func prepareAudioRecording() throws {
    let audioSession = AVAudioSession.sharedInstance()
    
    try audioSession.setCategory(.record)
    try audioSession.setActive(true, options: .notifyOthersOnDeactivation)
  }
  
  // 2
  private func generateSignature() {
    let inputNode = engine.inputNode
    let recordingFormat = inputNode.outputFormat(forBus: .zero)
    
    inputNode.installTap(onBus: .zero, bufferSize: 1024,
                         format: recordingFormat) { [weak session] buffer, _ in
      session?.matchStreamingBuffer(buffer, at: nil)
    }
  }
  
  // 3
  private func startAudioRecording() throws {
    try engine.start()
    
    isRecognizingSong = true
  }
}