alsactl: add an iterator of registered instances of sound card
In a mode of 'monitor', when given no argument, all of available control
node is observed for their events. At present, discovering the nodes is
done according to sound card number, instead of listing nodes in
configuration space of alsa-lib.
This commit adds a structure to discover sound cards with a simple
interface.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
git://git.alsa-project.org / alsa-utils.git / commit