Question

我试图在Swift中做一些相当基本的事情，即确定当前用于录制我的声音的设备。

（即我使用以下代码通过命令行应用程序录制声音）

let settings = [
    AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
    AVSampleRateKey: 12000,
    AVNumberOfChannelsKey: 1,
    AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
]
let recorder = try AVAudioRecorder(url: fileUrl, settings: settings);
audioRecorder.start();

如何从AVAudioRecorder获取详细信息告诉我＆＃34;这是系统用于记录的默认输入设备＆＃34;？即默认设备为＆＃34;内置麦克风＆＃34;或＆＃34; Airpods＆＃34;等。

Answer 1

我设法通过使用Core Audio库解决了我的问题。以下是从当前选定的默认设备获取设备名称的代码：

func showDeviceName() {

    // load the current default device
    var deviceId = AudioDeviceID(0);
    var deviceSize = UInt32(MemoryLayout.size(ofValue: deviceId));
    var address = AudioObjectPropertyAddress(mSelector: kAudioHardwarePropertyDefaultInputDevice, mScope: kAudioObjectPropertyScopeGlobal, mElement: kAudioObjectPropertyElementMaster);
    var err = AudioObjectGetPropertyData(AudioObjectID(kAudioObjectSystemObject), &address, 0, nil, &deviceSize, &deviceId);

    if ( err == 0) {
        // change the query property and use previously fetched details
        address.mSelector = kAudioDevicePropertyDeviceNameCFString;
        var deviceName = "" as CFString;
        deviceSize = UInt32(MemoryLayout.size(ofValue: deviceName));
        err = AudioObjectGetPropertyData( deviceId, &address, 0, nil, &deviceSize, &deviceName);
        if (err == 0) {
            print("### current default mic:: \(deviceName) ");
        } else {
            // TODO:: unable to fetch device name 
        }
    } else {
        // TODO:: unable to fetch the default input device
    }
}

Swift：查询以确定Mac OS上的默认输入设备

1 个答案: