I've been fighting an issue with PortAudio on CentOS for a few days now: I have two Delta 1010 cards which I'm using with mod_portaudio streams.

On Windows, the cards appear as eight two-channel devices, and FreeSWITCH can use them. On CentOS, the cards appear as two eight-channel devices (actually 10 out/12 in) and I'm unable to configure more than two channels per card.

Looking at the code, it looks like pablio.h's MAX_IO_CHANNELS is hardcoded to 2, and this is the limit of mod_portaudio. As it's a ring-buffer, I can see why it might need to be a power of 2, but does anyone know why it is set to 2?

How dangerous would it be to increase this value? Any thoughts?

Regards,

Erik