public static extern pa_error_t Pa_OpenDefaultStream( IntPtr stream, int_t numInputChannels, int numOutputChannels, PaSampleFormat sampleFormat, double sampleRate, unsigned_long_t framesPerBuffer, PaStreamFlags streamFlags, _PaStreamCallback streamCallback, IntPtr userData);
public static extern pa_error_t Pa_OpenStream( IntPtr stream, IntPtr inputParameters, IntPtr outputParameters, double sampleRate, unsigned_long_t framesPerBuffer, PaStreamFlags streamFlags, _PaStreamCallback streamCallback, IntPtr userData);