On Sun, 16 Dec 2001, Paul Davis wrote:
> >Could you explain to me how to do the following: the user has a TV capture
> >card with audio-out that is plugged in into one of the sound cards
> >installed in the system. I need to ask user which card and which input
> >s/he plugged the TV audio into. How do I do that ? (Preferably without the
> >user messing around with configuration files or entering names from
> >keyboard).
>
> i don't know. i am not sure why you are so averse to having the user
> use their keyboard. you can put "default" in the keybd entry to start
If, for example, this is a settop box like interface the user is not
supposed to use the keyboard.
Btw, it seems that using "hw:CARD=0" does the thing for me. So now I have
to figure out what to do with snd_ctl_elem_list_t.
Vladimir Dergachev
> it up; if they have only 1 soundcard, that will be enough; if they
> have more cards and don't have an ~/.asoundrc file, that will also be
> enough; if they do have an ~/.asoundrc file, then they will know what
> to type.
>
> i think there is a way to get the list of PCM names defined there,
> however. check aplay, since "aplay -L" does this. i don't think it
> returns just a list of names, however - the method it uses accesses
> the entire configuration list for ALSA devices, PCM, MIDI and other.
>
> ALSA is and will be encouraging the existence of ~/.asoundrc (and
> system-wide equivalent) files. I would expect to see a front end for
> creating and editing them emerge within 6 months or so of ALSA's
> adoption into the kernel.
>
> Without them, "plug:dev,subdev" will work as a string you can use for
> the `subdev' of `dev', accessed with maximum flexibility (no
> constraints on channel count, sample format etc.). "hw:dev,subdev"
> gives the equivalent, but the devices are totally
> hardware-constrained. I don't know how to count the number of
> physically installed cards in ALSA 0.9.
>
> but please note the the number of physically installed cards may not
> be the same as the number of PCM devices the user wants to have
> available, for several reasons.
>
> --p
>
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