New subject: [linux-audio-dev] ALSA OSS Emulation and emu10k1

12 Mar 2005

Hi all!

I managed to get half of the work with a custom .asoundrc file:
"pcm.prear {
    type plug
    slave.pcm "rear"
}

pcm.dsnopp {
    ipc_key 1027
    ipc_key_add_uid true
    type dsnoop
    slave.pcm "hw:0,0"
}

pcm.skype {
    type asym
    playback.pcm "prear"
    capture.pcm "dsnoop"
}

pcm.dsp1 {
    type plug
    slave.pcm "skype"
}

ctl.mixer1 {
    type hw
    card 0
}"

Then I got an alsa pcm device that uses the Wave Surround as an output, mapped 
to /dev/sdp1 when running under aoss.
I tried to record from the dsp1 with sound-record (oss recorder) and that 
worked fine!

BUT: skype doesn't support aoss... :-/ 
I thought about lauching it with artsd but I need TWO devices: /dev/dsp(0) as 
the ring device and /dev/dsp1 as the phone device and artsd cannot handle two 
devices, as far as I know...
How can I manage to use the skype device as an OSS device under skype?

Then the second trick would be to set the Main volume controle from skype (and 
dsp1) as the Wave Surrount control.
Couldn't find anythong on this, except for an OSS device, BUT I don't have 
any /proc/asound/oss card dsp1 since it emerge from aoss... :-/

What params can the ctl section use (I couldn't find any)

Thx!

Romain 

...
  Hi,

 I was wondering, is it possible to assign /dev/dspX devices to the 
 secondary and tertiary PCM devices on an emu10k1?

 I have a SB Live! Platinum with LiveDrive IR. The stereo out is connected 
 to my regular set of speakers. The surround output is connected to an 
 earphone headset, it's mic is connected to the mic input on my sound card.

 Also, another microphone is connected to the mic/line on the LIveDrive.

 Now, I use skype, which is closed source. It uses OSS devices and aoss will 
 not work with it. I would like to have a /dev/dspX device that records from 
 the mic input and plays back to the surround output, so that skype, and 
 skype only, will use the headset.

 The headset works fine in alsa mode and alsa apps can use it perfectly well.

 I tried all /dev/dspX and /dev/adspX devices, to no avail. I tries aoss 
 with .asoundrc modifications, no luck. I even read the driver source, but 
 I'm not really conversant with the structure of the driver and couldn't 
 find anything useful. It would take me forever to figure it out from the 
 source code.

 Is it possible, maybe with module parameters, to make alsa do this? Would 
 it need a patch, if yes, does someone have one? If no, what would have to 
 be done where to make that work?

 Melanie 

Re: [linux-audio-dev] ALSA OSS Emulation and emu10k1