Opening another audio driver from a driver

Opening another audio driver from a driver

[Himanshu Chauhan]

Hello all,

I am working with the virtual device driver (dummy.c). Is it possible to
route the audio data
from the dummy driver to an actual hardware's device driver? For this,
do I need to open the
driver using syscalls? I don't want to make any changes on the other
driver. I didn't see
any exported functions in any of the actual drivers, so I cannot stack
my driver on that.

What should be done in this case?

Thanks

Regards
--Himanshu

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Re: Opening another audio driver from a driver

[James Courtier-Dutton]

On 09/01/07, Himanshu Chauhan <hs.chauhan@gmail.com> wrote:
> Hello all,
>
> I am working with the virtual device driver (dummy.c). Is it possible to
> route the audio data
> from the dummy driver to an actual hardware's device driver? For this,
> do I need to open the
> driver using syscalls? I don't want to make any changes on the other
> driver. I didn't see
> any exported functions in any of the actual drivers, so I cannot stack
> my driver on that.
>
> What should be done in this case?
>
> Thanks
>
> Regards
> --Himanshu
>

I don't think you can do that. I also don't see why you would want to do it.
If you want to like the dummy one to the real one, why use the dummy
one in the first place. Just use the real one.

James

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Re: Opening another audio driver from a driver

[Takashi Iwai]

At Tue, 9 Jan 2007 16:20:44 +1100,
James Courtier-Dutton wrote:
> 
> On 09/01/07, Himanshu Chauhan <hs.chauhan@gmail.com> wrote:
> > Hello all,
> >
> > I am working with the virtual device driver (dummy.c). Is it possible to
> > route the audio data
> > from the dummy driver to an actual hardware's device driver? For this,
> > do I need to open the
> > driver using syscalls? I don't want to make any changes on the other
> > driver. I didn't see
> > any exported functions in any of the actual drivers, so I cannot stack
> > my driver on that.
> >
> > What should be done in this case?
> >
> > Thanks
> >
> > Regards
> > --Himanshu
> >
> 
> I don't think you can do that. I also don't see why you would want to do it.
> If you want to like the dummy one to the real one, why use the dummy
> one in the first place. Just use the real one.

In theory it's not impossible but very ugly and unrecommended at all.
Anyway, user-space solution is more appropriate for such a virtual
stuff, IMO.  If apps require ALSA API, you can implement a plugin like
jack or polypaudio.


Takashi

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