audioInfo.swift

        var status: OSStatus
        let readOrWrite = kAudioFileGlobalInfo_ReadableTypes
        var propertySize: UInt32 = 0
        status = AudioFileGetGlobalInfoSize(readOrWrite,
                                            0,
                                            nil,
                                            &propertySize)
        print(status)
        print(propertySize)
        
        let typesAddress = UnsafeMutablePointer<AudioStreamBasicDescription>.allocate(capacity: Int(propertySize))
        
        status = AudioFileGetGlobalInfo(readOrWrite,
                                        0,
                                        nil,
                                        &propertySize,
                                        typesAddress)
        
        let count = Int(propertySize) / MemoryLayout<AudioStreamBasicDescription>.size
        
        for i in 0..<count {
            var format4cc = typesAddress[i].mFormatID.bigEndian
            withUnsafePointer(to: &format4cc) {ptr in
                print(String(format: "%d: mFormatID: %4.4s, mFormatFlags: %d, mBitsPerChannel: %d", arguments: [i, ptr, typesAddress[i].mFormatFlags, typesAddress[i].mBitsPerChannel]))
            }
        }
        
        typesAddress.deallocate(capacity: Int(propertySize))