Subject: Re: [linux-audio-user] ice1712 - OSS mixer emulation not working
From: Andrew Nesbit (alnesbit_AT_optushome.com.au)
Date: Tue May 07 2002 - 12:59:44 EEST
> Just making sure; have you done:
> # modprobe snd-mixer-oss
> ? I don't have a 2496 myself, so I don't know if the ice1712
> mixer is actually available to the ALSA driver at all, or its OSS
> emulation layer.
Yo Andre! Good to hear from you again :)
Yes, snd-mixer-oss, etc are all there...
So I got sucked into this question, and had a read of the programming
spec booklet for the ice1712, and ice1712-based cards use a /digital/
mixer designed specifically for monitoring purposes (i.e. it operates
before the signal gets to the DAC), whereas the more common style of
audio cards generally have both input and output /analog/ mixers
(operating before ADC and after DAC).
Thus, it seems that ice1712-based audio cards have an "inside-out"
structure, and so I would imagine that the ice1712 circuitry would map
very differently to the OSS emulation layer, and, if I am correct,
this would be why the OSS mixer emul. is unsupported.
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