[linux-audio-dev] interesting read

Lee Revell rlrevell at joe-job.com
Sun Jan 9 15:16:46 EST 2005


On Sun, 2005-01-09 at 20:52 +0100, Stefano Cavallari wrote:
> Il dom, 2005-01-09 alle 19:42, Lee Revell ha scritto:
> 
> > Anyway if it works like they claim, it implies the middle layer is quite
> > powerful.  It's a fascinating read.  The really interesting stuff is in
> > the Word document.
> > 
> > http://www.microsoft.com/whdc/device/audio/wavertport.mspx
> > http://download.microsoft.com/download/5/b/5/5b5bec17-ea71-4653-9539-204a672f11cf/WaveRTport.doc
> > 
> > Lee
> It seems an interface for zero-copy drivers.
> Correct me if I am wrong.
> 

Not just zero copy, you don't even need to interrupt at the period
boundary.  The critical hardware feature is being able to mmap the
position register.  Does any current hardware do this?

> Anyway, what is the status of linux alsa drivers regarding rt
> capabilities? 
> 

If Ingo's RT patches and the high res POSIX timers patch get merged then
Linux can provide the kind of deterministic RT scheduling described in
this article right now.  Maybe this will light a fire under some
people ;-)

Lee



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