[alsa-devel] [RFC] Channel mapping API

Mark Brown broonie at opensource.wolfsonmicro.com
Tue Aug 21 17:07:20 CEST 2012

On Tue, Aug 21, 2012 at 04:52:29PM +0200, David Henningsson wrote:
> On 08/21/2012 04:18 PM, Mark Brown wrote:

> >Or perhaps what we want to do here is define the channel mapping in
> >terms of saying "I'm connecting to this input/output" and then use the
> >jack interface to describe all inputs and outputs rather than just jacks
> >(making sure it's easy to see which ones can change state)?

> That's an interesting idea. The possible drawback is that it would
> require all drivers that want to use this to implement jacks also.

I'm not sure that's a big deal, we should be able to make the fixed data
case easy enough to do.

> In the ctljack interface for HDA, we already describe all inputs and
> outputs - with the nonchangable ones having the additional "Phantom"
> suffix, so the result becomes e g "Internal Mic Phantom Jack".

Which of course is also replicated with the calls into the original
jack API.
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