OSS emulation question

OSS emulation question

[Adrian McMenamin]

My mixer code is currently not working because my device does not report
the availability of SOUND_MASK_VOLUME to the oss emulation code.

In the olden days I'd just write the ioctl - presumably I don't have to
do that with ALSA? How do I get round it?

Thanks

Adrian



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Re: OSS emulation question

[Clemens Ladisch]

Adrian McMenamin wrote:
> My mixer code is currently not working because my device does not report
> the availability of SOUND_MASK_VOLUME to the oss emulation code.

ALSA's OSS emulation automatically computed the mask value.

> In the olden days I'd just write the ioctl - presumably I don't have to
> do that with ALSA? How do I get round it?

See snd_mixer_oss_build() in core/oss/mixer_oss.c for a list of mixer
control names that get mapped to OSS controls (e.g., "Master Playback
Volume"/"...Switch" would be mapped to SOUND_MIXER_VOLUME).


HTH
Clemens


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Re: OSS emulation question

[Adrian McMenamin]

On Thu, 2006-03-30 at 14:55 +0200, Clemens Ladisch wrote:
> Adrian McMenamin wrote:
> > My mixer code is currently not working because my device does not report
> > the availability of SOUND_MASK_VOLUME to the oss emulation code.
> 
> ALSA's OSS emulation automatically computed the mask value.
> 
> > In the olden days I'd just write the ioctl - presumably I don't have to
> > do that with ALSA? How do I get round it?
> 
> See snd_mixer_oss_build() in core/oss/mixer_oss.c for a list of mixer
> control names that get mapped to OSS controls (e.g., "Master Playback
> Volume"/"...Switch" would be mapped to SOUND_MIXER_VOLUME).
> 
> 
I have implemented master volume and master switch but all I get is:

audio/gain: setable Volume/PCM-Level not supported by your audio device:
0000


what is the minimum set of controls I need to have settable volume
in /dev/mixer (ie oss emulation)?



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Re: OSS emulation question

[Clemens Ladisch]

Adrian McMenamin wrote:
> On Thu, 2006-03-30 at 14:55 +0200, Clemens Ladisch wrote:
> > See snd_mixer_oss_build() in core/oss/mixer_oss.c for a list of mixer
> > control names that get mapped to OSS controls (e.g., "Master Playback
> > Volume"/"...Switch" would be mapped to SOUND_MIXER_VOLUME).
> 
> I have implemented master volume and master switch but all I get is:
> 
> audio/gain: setable Volume/PCM-Level not supported by your audio device:
> 0000
> 
> what is the minimum set of controls I need to have settable volume
> in /dev/mixer (ie oss emulation)?

One control should be enough.

What are the contents of /proc/asound/cardX/oss_mixer?
(You can change mappings, see Documentation/OSS-Emulation.txt)


Regards,
Clemens


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Re: OSS emulation question

[Adrian McMenamin]

On Fri, 2006-03-31 at 11:37 +0200, Clemens Ladisch wrote:
> Adrian McMenamin wrote:
> > On Thu, 2006-03-30 at 14:55 +0200, Clemens Ladisch wrote:
> > > See snd_mixer_oss_build() in core/oss/mixer_oss.c for a list of mixer
> > > control names that get mapped to OSS controls (e.g., "Master Playback
> > > Volume"/"...Switch" would be mapped to SOUND_MIXER_VOLUME).
> > 
> > I have implemented master volume and master switch but all I get is:
> > 
> > audio/gain: setable Volume/PCM-Level not supported by your audio device:
> > 0000
> > 
> > what is the minimum set of controls I need to have settable volume
> > in /dev/mixer (ie oss emulation)?
> 
> One control should be enough.
> 
> What are the contents of /proc/asound/cardX/oss_mixer?

Doesn't look good....


/proc/asound/card0 # cat oss_mixer
VOLUME "" 0
BASS "" 0
TREBLE "" 0
SYNTH "" 0
PCM "" 0
SPEAKER "" 0
LINE "" 0
MIC "" 0
CD "" 0
IMIX "" 0
ALTPCM "" 0
RECLEV "" 0
IGAIN "" 0
OGAIN "" 0
LINE1 "" 0
LINE2 "" 0
LINE3 "" 0
DIGITAL1 "" 0
DIGITAL2 "" 0
DIGITAL3 "" 0
PHONEIN "" 0
PHONEOUT "" 0
VIDEO "" 0
RADIO "" 0
MONITOR "" 0





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Re: OSS emulation question

[Adrian McMenamin]

On Fri, 2006-03-31 at 11:37 +0200, Clemens Ladisch wrote:

> (You can change mappings, see Documentation/OSS-Emulation.txt)

Manual reassignment works well, but I haven't yet been able to make
automatic. :(

But at least I know the mixer code is fundamentally sound and I'll stick
in my CVS



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