static void ProcessStream(VoiceActivityDetector vad, Stream inputStream)
        {
            var bufferSize = 3000 + new Random().Next(200);
            var buffer = new byte[bufferSize];
            int bytesRead = 0;
            bytesRead = inputStream.Read(buffer, 0, bufferSize);
            while (bytesRead > 0)
            {
                vad.ProcessBufferEx(buffer, bytesRead);

                bufferSize = 3000 + new Random().Next(200);
                buffer = new byte[bufferSize];
                bytesRead = inputStream.Read(buffer, 0, bufferSize);
            }
        }