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
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