whisper.cpp/examples/whisper.swiftui/whisper.swiftui.demo/Utils/Recorder.swift

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import Foundation
import AVFoundation
actor Recorder {
private var recorder: AVAudioRecorder?
enum RecorderError: Error {
case couldNotStartRecording
}
func startRecording(toOutputFile url: URL, delegate: AVAudioRecorderDelegate?) throws {
let recordSettings: [String : Any] = [
AVFormatIDKey: Int(kAudioFormatLinearPCM),
AVSampleRateKey: 16000.0,
AVNumberOfChannelsKey: 1,
AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
]
#if !os(macOS)
let session = AVAudioSession.sharedInstance()
try session.setCategory(.playAndRecord, mode: .default)
#endif
let recorder = try AVAudioRecorder(url: url, settings: recordSettings)
recorder.delegate = delegate
if recorder.record() == false {
print("Could not start recording")
throw RecorderError.couldNotStartRecording
}
self.recorder = recorder
}
func stopRecording() {
recorder?.stop()
recorder = nil
}
}