[alsa-devel] Master vs. Front/Rear/LFE/... elements

[Mark Brown]

On Thu, May 07, 2009 at 02:56:54PM +0200, Lennart Poettering wrote:

> From the PA perspective I actually don't really need the full routing
> of the sound card exposed. I always want to focus on actual end-user
> use cases instead of exposing the full mixer capabilities. All I need
> to know is which elements are in the pipeline from my PCM streams to a
> specific output, resp. from a specific input to my PCM stream and a
> more high-level idea what those elements actually mean. i.e. all I
> need would be an API like this:

To a good approximation that is a fairly simple query on the full
routing information (modulo any bypass paths, I guess).  I'm not sure
the drivers would be able to answer your question without also being
able to answer any other routing question.