[alsa-devel] [RFC] Channel mapping API

Mark Brown broonie at opensource.wolfsonmicro.com
Tue Aug 21 16:18:00 CEST 2012

On Tue, Aug 21, 2012 at 04:13:53PM +0200, David Henningsson wrote:

> It reminds me of the discussion we had about jack labelling (for HDA
> or everyone? I do not remember), where we ended up having

> 1) physical location (left side, internal, docking station)
> 2) type (headphone, speaker)
> 3) channel map (front, rear, c/lfe)

> Maybe that's where this discussion is heading as well? I like the
> idea of having the same TLV description for jacks, mixer controls
> and PCM channels, maybe that could work for all but the most exotic
> cases?

> (Where exotic means unusual hw on both the pro-audio and the embedded side)

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)?
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