[alsa-devel] [RFC] Channel mapping API

Jaroslav Kysela perex at perex.cz
Tue Aug 21 14:31:55 CEST 2012

Date 21.8.2012 14:15, Takashi Iwai wrote:
> For getting the channel map, the driver could send a notification once
> when routing is changed.

This leads to this question: Why you define the map controls volatile?
I think that the channel map changes can be tracked nicely using the
standard control event notifications without any hidden changes.
Perhaps, the value change event may be invoked each time after prepare
and when the user space set the new values and also in above situation,
when the channel map is changed on an external request.


Jaroslav Kysela <perex at perex.cz>
Linux Kernel Sound Maintainer
ALSA Project; Red Hat, Inc.

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