[alsa-devel] Allow alsa configuration to be loaded from a alsa.conf.d folder

[gmane at colin.guthr.ie]

Hi,

This is a small patch for alsa-lib that supports the common ".d" folder
configs.

The idea here is to make it easier for packagers and distros to supply
plugin configuration without having to patch alsa-lib to do so (or
by managing a /etc/asound.conf file which may want to be tweaked by multiple
files)

If this patch is accepted, I'll modify alsa-plugins to inlcude a
pulseaudio.conf file in /usr/share/alsa/alsa.conf.d/ which defines
a pcm.pulse anc ctl.pulse. If distros want to default to PA, they should
include their own file in there that defines pcm|ctl.!default appropriately.

Similar configuration could be added for third party alsa plugins such as
the DTS encoder plugin being developed by Alexander Patrikov which are
shipped outside of alsa.

I don't think there is anything too controversial in here, so hopefully it'll
be accepted.

Cheers

Col