Capture Microphone Sound

capture-microphone-sound.swift

/*
Step 1 - Privacy Text for Requesting Microphone Permission

Open the Info.plist file as source code and enter the following text in the <dict></dict>:

<key>NSMicrophoneUsageDescription</key>
<string>This app requires microphone</string>
*/

/*
Step 2 - Imports
*/
import AVFoundation

/*
Step 3 - Check for Microphone Permission
*/
let status = AVCaptureDevice.authorizationStatus(for: .audio)
switch status {
case .authorized: print("authorized")
case .notDetermined: print("permission not requested")
default: print("other unknown cases")
}

/*
Step 4 - Request for Microphone Permission
*/
AVCaptureDevice.requestAccess(for: .audio) { granted in
    DispatchQueue.main.async {
        guard granted else {
            print("permission not granted")
            return
        }
        print("authorized")
    }
}

/* 
Step 5 - Get Microphone Capture Device
*/
func getMicrophoneCaptureDevice() -> AVCaptureDevice? {        
    if let microphoneCaptureDevice = AVCaptureDevice.default(.builtInMicrophone, for: .audio, position: .unspecified) {
        return microphoneCaptureDevice
    }
    return nil
}

/*
Step 6 - Get Microphone Capture Device Input
*/
func getCaptureDeviceInput(captureDevice: AVCaptureDevice) -> AVCaptureDeviceInput? {
    do {
        let captureDeviceInput = try AVCaptureDeviceInput(device: captureDevice)
        return captureDeviceInput
    } catch let error {
        print("Failed to get capture device input with error \(error)")
    }
    return nil
}

/*
Step 7 - Add Microphone Capture Device Input to Capture Session Controller
*/
let captureSession: AVCaptureSession
if let audioCaptureDevice = getMicrophoneCaptureDevice() {
    if let audioCaptureDeviceInput = getCaptureDeviceInput(captureDevice: audioCaptureDevice) {
        if captureSession.canAddInput(audioCaptureDeviceInput) { 
            captureSession.addInput(audioCaptureDeviceInput)
        }
    }
}

/*
Step 8 - Remove Microphone Capture Device Input
*/
captureSession.removeInput(audioCaptureDeviceInput)