Re: YMF754 with front & rear output?

[Takashi Iwai <tiwai@suse.de>]

At Wed, 20 Feb 2002 08:50:23 -0500 (EST),
Adam K Kirchhoff wrote:
> 
> 
> On Wed, 20 Feb 2002, Takashi Iwai wrote:
> 
> > At Mon, 18 Feb 2002 22:45:07 EST (-0500),
> > Adam K Kirchhoff wrote:
> > > 
> > > 
> > > I'm curious if anyone has gotten one of the ymfpci cards to work with
> > > 
> > > front and rear output with the OSS emulation?  Is it even supported at
> > > 
> > > this point?
> > 
> > (please note i myself didn't test the following:)
> > 
> > the rear pcm assigned to device #2.  so at first please check whether
> > the driver really supports rear speakers by playing via hw:0,2, i.e.
> 
> It does....  Alsa has natively supported both the front and rear channels
> for a number of months now, iirc.
> 
> > 	% aplay -Dhw:0,2 foo.wav
> 
> Yep.  That works fine.
> 
> One of the first things I'm noticing now, however, is that the only Alsa
> application that seems to use the rear speakers is aplay, and only when
> specified.  For example, alsaplayer will still only use the front
> speakers.
 
it's a problem of alsaplayer.  doesn't work "alsaplayer -d hw:0,2" ?

> Now, is this something that needs to be set up in the .asoundrc file?  Is
> this documented somewhere?

no, you don't need to edit asoundrc.
to the latter question - again - no.  no documents, so far.
 
> > if it's ok, please try to add the following option to snd-pcm-oss:
> > 
> > 	options snd-pcm-oss snd_adsp_map=2
> > 
> > so that hw:0,2 is mapped to /dev/adsp.
> 
> Done.  But what exactly does this give me :-)  I hate to seem like an
> idiot, but my only other experience with the alsa drivers is with a SB
> Live! With the SB Live!, you don't need to take any extra steps to get
> both the front and rear channels working.  I certainly don't remember
> having to setup anything for /dev/adsp :-)
 
hmm, i'm not sure whether sb live supports rear outputs on OSS
emulation mode..  does it?


> I see a couple references to adsp in the alsa-howto, but nothing that
> really explains how to set it up and use it :-)
 
well, this is also not documented.
i'm going to write a brief note later.


> > The another possibility is to use ALSA OSS wrapper library.
> > You can define like this in your ~/.asoundrc
> > 
> > 	pcm.adsp0 pcm.rear
> > 
> > then run program via aoss wrapper.
> 
> Is this documented somewhere, too?  Searching for "aoss wrapper" in google
> doesn't turn up anything, and the search mechanism on the Alsa homepage
> seems to be broken (someone might want to remove it till it gets fixed)
> :-) 
 
it's included in alsa-oss package.  aoss is a very small wrapper
script.  there is a man page, so please refer to it.

and, i should answer before you ask; the usage of alsa-oss lib is also
almost undocumented :-<


Takashi

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