AudioKit How To Dispose or Reuse AKNodeRecorder

Question

In my app I give the user options to create multiple recordings which will have different names.

I use the following to record:

let tape = try AKAudioFile.init(forWriting: URL.init(fileURLWithPath: path), settings: [AVFormatIDKey: kAudioFormatMPEG4AAC, AVSampleRateKey: 44100, AVNumberOfChannelsKey: 2, AVEncoderBitRateKey: 192000, AVEncoderAudioQualityKey:AVAudioQuality.high.rawValue])
let recorder = try AKNodeRecorder(node: masterMixer, file: tape)

try recorder.record()

// Some time later
recorder.stop()

Everything works fine, I get the recorded audio and I can play it and hear music but here are my requirements. This works for one recording. Now I need to record another recording.

How do I go by this? Do I create another AKNodeRecorder and bind it just like this again? If this is the case wouldnt binding it all the time cause memory leaks?

Answer 1

After you've recorded an audio file with AKNodeRecorder, you can reuse it. Just reset it before recording again:

func startRecordingAudio() {
    do {
        try self.recorder?.reset()
        try recorder?.record()
    } catch {
        print("Error starting audio recording")
    }
}

This will save the recording to the same file. Therefore to preserve each recording, you should move the recorded file to a final destination after you've finished each recording.

func stopRecording() {
    recorder?.stop()
    if let recordedURL = recorder?.audioFile?.url {
        let uuid = NSUUID().uuidString
        let destinationPath = NSTemporaryDirectory() + "/" + uuid + ".caf"
        let destinationURL = URL(fileURLWithPath: filePath)
        let fileManager = FileManager.default
        do {
            try fileManager.moveItem(at: recordedURL, to: destinationURL)
        } catch {
            print("Could not copy file")
        }
    }
}