[PATCH] added detection of ALSA OSS devices

[David Zeuthen]

On Mon, 2005-07-25 at 23:13 +0200, Danny Kukawka wrote:
> > Do you think it's useful to add these devices? 
> 
> Yes, I think we should. We need this on SUSE to set up permissions for
> these devices with resmgr. I discussed this and the relations between
> the alsa and oss devices with our alsa developer (Takashi Iwai)
> 
> > I don't know a lot about 
> > ALSA really, what does ALSA OSS device support entail? 
> 
> ALSA and OSS are two different things. Quote from [1]: "One of the aims
> of ALSA is to provide full OSS compatibility for OSS applications. ALSA
> has an OSS emulation which supports all of the OSS devices listed below
> although the OSS sequencer /dev/sequencer only half works (playback
> works but recording from MIDI keyboards is broken ...)". For more
> information also see [2].
> 
> > I'm wary about 
> > adding them but I realize I know very little about ALSA and it's pretty
> > complicated already :-)
> [...]

I still have a few issues with this

 - ALSA-OSS emulation provides OSS emulation through ALSA; thus we
   shouldn't export hal device objects with alsa.* properties; it
   should be oss.* properties if we should export anything

 - Not sure we want to export OSS objects at all in HAL; is there
   a good reason for doing this? Everything should be using ALSA
   anyway

 - The device file names are fixed (OSS apps except this) so why don't
   just resort to udev rules for the permission tweaking?

Cheers,
David






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