Mark Brown wrote:
On Tue, Aug 28, 2012 at 12:29:33AM +0200, Clemens Ladisch wrote:
+config SND_MEDIA
- bool "Media Controller API (EXPERIMENTAL)"
- depends on EXPERIMENTAL
- help
Say Y here to enable the media controller API, which allows toretrieve the internal topology of sound devices.I think there's a general consensus these days that EXPERIMENTAL is pretty meaningless so we probably shouldn't bother with it.
Well, I couldn't claim this to be any less experimental than the implementation in drivers/media/. :)
The text is also a bit confusing, it enables use of the media controller API for ALSA devices really.
It's in the ALSA menu. I could put "ALSA" in the title if it helps.
I have to say I'm also a bit surprised that there's no core framework for media controller and we're open coding ioctl() implementations here,
drivers/media/media-*.c exists, but I did not use that implementation because someone expressed concern about it being too heavyweight ...
I'd have thought there would at least be a way of enumerating all media controller devices in the system...
It appears userspace is supposed to check all /dev/media* devices. (Using /dev/snd/controlC* is just a makeshift arrangement; I'll have to reuse some part of the media device registration framework, or tell udev to create symlinks.)
Regards, Clemens