UnsafeMutablePointerMove.swift

private func audioBufferListWithObjectID(objectID: AudioObjectID, scope: AudioObjectPropertyScope) throws -> AudioBufferList {
    var address = audioBufferListAddressWithScope(scope)
    var length = try propertyDataSizeWithObjectID(objectID, address: address)
    let bytes = UnsafeMutablePointer<AudioBufferList>.alloc(Int(length))
    defer { bytes.destroy() }
    let status = AudioObjectGetPropertyData(objectID, &address, 0, nil, &length, bytes)
    if status != noErr {
        throw TelephoneError.SystemAudioDevicePropertyDataGetError(systemErrorCode: Int(status))
    }
    return bytes.memory
}