[alsa-devel] PCM extra attributes

Hey Takashi,

We were looking to find the substream index in the userspace for the device opened (in case we support multiple substreams and mix them). Since we also wanted to have some specific alsa controls for each substream the problem of not knowing substream in usermode make stuff interesting!

I was pointed to an old RFC of yours [1] and it fits my needs. I can get the substream index using this and program the alsa controls.

Now reading the archive looks like it was note merged. Would be okay to do so for above case. I can resurrect the patchset if you would like...

Thanks ~Vinod

[1]: http://mailman.alsa-project.org/pipermail/alsa-devel/2009-June/018651.html

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