Thanks that explains.
Florian
Patrick Shirkey wrote:
>
> Florian Bomers wrote:
> > (I initially posted this to alsa-user without answers. Hope to get more lucky
> > here...)
> >
> > Hi,
> >
> > sorry for those general questions, but I wasn't able to find anything on the
> > archives or in the ALSA documentation.
> >
> > What is the meaning of devices vs. subdevices ? What is an example where a
> > device would have several subdevices, as opposed to the card having several
> > devices ?
>
> A card is a device. The available pcm channels are sub devices.
>
> >I want to display a list of available "ports" where the user can send
> > the audio generated by the program. If a device has several subdevices, would I
> > include them in the list, or just list the devices for each card ?
> >
>
> You should include the sub devices.
>
> > My program successfully lists the cards with their devices and subdevices for
> > hw: (i.e. snd_ctl_open("hw:0") ). However, this does not work for the plughw:
> > way, although from what I understood, I want to use plughw: (as it is supposed
> > to support automatic sample rate conversion). How do I iterate all available
> > plughw: "cards", devices, and subdevices? Or can I assume that if hw:0,0 exists,
> > that plughw:0,0 is the same card/device - and I just can't iterate available
> > plughw:'s directly ?
> >
>
> yes plughw:0,0 is the same as hw:0,0 but with automatic sample rate
> conversion.
>
> > Thanks!
> > Florian
> >
> >
>
> --
> Patrick Shirkey - Boost Hardware Ltd.
> For the discerning hardware connoisseur
> Http://www.boosthardware.com
> Http://www.boosthardware.com/LAU/guide/
> ========================================
>
> "Um...symbol_get and symbol_put... They're
> kindof like does anyone remember like get_symbol
> and put_symbol I think we used to have..."
> - Rusty Russell in his talk on the module subsystem
--
Florian Bomers
Java Sound
Java Software/Sun Microsystems, Inc.
http://java.sun.com/products/java-media/sound/
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