DMIX and capture stream

[David Lloyd <dmlloyd@tds.net>]

I'm working on changing DMIX to allow clients to open the capture stream.  
But I've hit a bit of a block with how to proceed.  Since it would seem
that a slave snd_pcm_t can only be opened either for capture or playback,
it would seem to follow that one would need a second handle to be able to
open both ways.  Is that correct?

Based on this assumption, I added a 'scappcm' member to the u.dmix member 
of snd_pcm_direct_t.  This would be the handle used for capture stream 
opens.  It would not be shareable like the playback stream (at least not 
yet).  Is this a reasonable approach?

I was thinking about copying out the read routines from pcm_plugin.c and 
editing them to use u.dmix.scappcm for reading.  Will this approach work 
or will I have to make dramatic changes?  Is anyone here willing to take 
some time and check over my work, maybe point me in the right direction?

Thanks for the help.

- D


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