[alsa-devel] [patch][saa7134] do not change mute state for capturing audio

Lennart Poettering lpoetter at redhat.com
Tue Jul 19 01:16:08 CEST 2011


On 17.07.2011 13:51, Mauro Carvalho Chehab wrote:

> If pulseaudio is starting sound capture at startup, then it is either
> a pulseaudio miss-configuration or a bug there. I fail to understand
> why pulseaudio would start capturing sound from a V4L audio at startup.
> I think that this is not the default for pulseaudio, though, as
> you're the only one complaining about that, and I never saw such
> behavior in the time I was using pulseaudio here.
> I don't know enough about pulseaudio to help on this issue,
> nor I'm using it currently, so I can't test anything pulsaudio-related.
> Lennart,
> Could you please help us with this issue?

ALSA doesn't really have a enumeration API which would allow us to get 
device properties without opening and configuring a device. In fact, we 
can't even figure out whether a device may be opened in duplex or 
simplex without opening it.

And that's why we have to probe audio devices, even if it sucks.


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