Thanks Rene.
Rene Herman wrote:
> On 12-07-08 20:19, stan wrote:
>
>> Rene Herman wrote:
>>
>> -snip-
>>> At that point, you are running "real" OSS, not the ALSA OSS
>>> emulation, and the "mplayer -ao oss foo.wav" should work again
>>> (aplay nor alsamixer would anymore). This stands a fair chance of
>>> getting you sound at that point. If it does not, please find an OSS
>>> mixer (aumix, rexima, or anything you already have installed that
>>> can be switched into OSS mode) to make really, really sure it still
>>> doesn't work...
>>
>> I have a question about this. When I look in the alsa driver
>> sources, I see that the modules snd-pcm-oss, snd-seq-oss, soundcore,
>> snd, etc. are all within this ALSA code. Does your statement above
>> about "real" OSS imply that this code is actually legacy OSS
>> incorporated within the ALSA driver tree? All the documentation
>> seems to imply that this is emulation code.
>
> soundcore is the kernel module that sits just above either ALSA or
> OSS, snd is the main ALSA module and yes, snd-{pcm,mixer,seq}-oss are
> the ALSA OSS emulation modules.
>
> The "at this point" above though was after him loading the OSS
> "es1371" driver that I posted as a patch in that thread so that Landis
> could try if that one worked -- the ALSA driver for the same card,
> snd-ens1371, did not produce sound.
>
> If the quotes around "real" in my statement confused things: they were
> only there to signifiy that the commercial product OSS might be what
> you'd properly call "real OSS" while the OSS drivers that were (and
> some still are) integrated into the kernel are properly what is called
> "OSS/Free".
>
> That's not important though. The code under under
> sound/core/{,seq}/oss is the ALSA OSS emulation and the code under
> sound/oss, including the sound/oss/es1371.c that the posted patch
> recreated, is real OSS.
>
>> When I look in the OSS item in make menuconfig for the kernel, it is
>> just legacy drivers.
>
> Yes. That code is kept around only for some corner cases where people
> seem to have found something working with the old OSS driver that the
> ALSA driver does not handle properly.
>
>> So I wanted to get clarification of my understanding from someone who
>> knows. Just had a thought; is the OSS driver self contained, meaning
>> that it contains the functionality now in alsa-lib as well as the
>> driver? That would explain everything.
>
> Yes, the OSS drivers are/were fully self-contained, no helper modules
> (other than soundcore) and no userspace libraries.
>
> Rene.
>
>
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