[pulseaudio-discuss] ALSA pulse plugin & SND_PCM_ACCESS_MMAP_INTERLEAVED

[Nikita V. Youshchenko]

>
> It's always the same issue. We cannot reliably emulate mmap'ed audio
> device access. Neither with ALSA nor with OSS.
>
> It's not a problem specific to PA. It's the same issue with almost any
> non-hw driver for libasound.

May I be a bit currious and ask why?
Isn't mmap'ed device just a buffer where application writes data, and audio 
driver picks data from (or vice-versa for capture)?
If so, a high-priority thread created by 'padsp' or pulse alsa plugin or 
whatever may do the same that driver does in 'hardware case' ...

Also an interesting, altouugh dead, related attempt is fusd + oss2pulse, 
see 
http://www.redhat.com/archives/fedora-desktop-list/2007-January/msg00080.html

Nikita