What if 4 PCM-instances are not enough?

What if 4 PCM-instances are not enough?

[Henrik Kretzschmar]

Hi,

we are developing a ALSA-device driver for the SEK'D/Marian ARC88,
which has 4 analog stereo IO's and a digital IO.
So there's is that little problem, that there only could be two combinations:
4 analog IO/0 digital
3 analog IO/1 digital,
which should IMHO be taken under attack in the future.

I am reading LDD3 at the moment and wondered how the best use of the 2.6 dev_t,
which doesn't limit the minors to 255, the starting point for my problem.

Is there a solution insight, which doesn't break compatibility with older apps?

Greets,
Henne


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Re: What if 4 PCM-instances are not enough?

[Eliot Blennerhassett]

On Mon, 22 May 2006 07:52, Henrik Kretzschmar wrote:
> Hi,
>
> we are developing a ALSA-device driver for the SEK'D/Marian ARC88,
> which has 4 analog stereo IO's and a digital IO.
> So there's is that little problem, that there only could be two
> combinations: 4 analog IO/0 digital
> 3 analog IO/1 digital,
> which should IMHO be taken under attack in the future.
>
> I am reading LDD3 at the moment and wondered how the best use of the 2.6
> dev_t, which doesn't limit the minors to 255, the starting point for my
> problem.
>
> Is there a solution insight, which doesn't break compatibility with older
> apps?

One possibility is to use subdevices for each stereo I/O.
PCM0 with 4 analog subdevices
PCM1 with 1 digital subdevice.

--
Eliot
AudioScience Inc.


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