list all available devices

list all available devices

[Timo Steuerwald]

Hi all,

can someone point me to the right location where I can find information 
about listing all available devices in ALSA?
A code sample will be also very nice :-)

Cheers,

Timo


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Re: list all available devices

[Giuliano Pochini]

On Mon, 6 Feb 2006, Timo Steuerwald wrote:

> Hi all,
>
> can someone point me to the right location where I can find information
> about listing all available devices in ALSA?
> A code sample will be also very nice :-)

aplay -l
arecord -l


--
Giuliano.


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Re: list all available devices

[Timo Steuerwald]

Giuliano Pochini wrote:

>aplay -l
>arecord -l
>  
>
Hi Giuliano,

thanks a lot! That's what I was searching for! :-)

Cheers,

Timo


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Re: list all available devices

[Lee Revell]

On Mon, 2006-02-06 at 11:19 +0100, Giuliano Pochini wrote:
> 
> On Mon, 6 Feb 2006, Timo Steuerwald wrote:
> 
> > Hi all,
> >
> > can someone point me to the right location where I can find information
> > about listing all available devices in ALSA?
> > A code sample will be also very nice :-)
> 
> aplay -l
> arecord -l

Are you sure that's good enough?  It does not list the PCMs in a format
useful to the application (like "default", hw:0", "surround51", "dmix"
etc).  AFAICT "aplay -l" doesn't give an application enough information
to populate a drop-down list.

This is a problem already for apps like "wengophone" - ALSA does not
provide a sane API for enumerating all usable PCMs so it only lists
"hw:x" PCMS and whatever is directly defined in .asoundrc (but NOT the
PCMs defined under /usr/share/alsa/* - probably it parses .asoundrc
directly, ugh)

Lee



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Re: list all available devices

[Timo Steuerwald]

Lee Revell wrote:

>Are you sure that's good enough?  It does not list the PCMs in a format
>useful to the application (like "default", hw:0", "surround51", "dmix"
>etc).  AFAICT "aplay -l" doesn't give an application enough information
>to populate a drop-down list.
>
>  
>
Hmmh, I haven't already taken a look at the code, but I thought this can 
be extended easily...

>This is a problem already for apps like "wengophone" - ALSA does not
>provide a sane API for enumerating all usable PCMs so it only lists
>"hw:x" PCMS and whatever is directly defined in .asoundrc (but NOT the
>PCMs defined under /usr/share/alsa/* - probably it parses .asoundrc
>directly, ugh)
>
>  
>
Uh, not very good :-/

Cheers,

Timo


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Re: list all available devices

[Lee Revell]

On Mon, 2006-02-06 at 19:10 +0100, Timo Steuerwald wrote:
> Hmmh, I haven't already taken a look at the code, but I thought this
> can 
> be extended easily...
> 

It's insane to expect every app to use 100 lines of code list to list
available PCMs.  It should be a single function call.

Lee



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Re: list all available devices

[Matthias König]

Hi,

Lee Revell <rlrevell@joe-job.com> writes:

> It's insane to expect every app to use 100 lines of code list to list
> available PCMs.  It should be a single function call.

Hmm, doesn't this exist already? What about this:

int snd_names_list(const char *iface, snd_devname_t **list)
Give a list of device names and associated comments for selected interface. 

Regards,
Matthias


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Re: list all available devices

[Lee Revell]

On Mon, 2006-02-06 at 19:30 +0100, Matthias König wrote:
> Hi,
> 
> Lee Revell <rlrevell@joe-job.com> writes:
> 
> > It's insane to expect every app to use 100 lines of code list to list
> > available PCMs.  It should be a single function call.
> 
> Hmm, doesn't this exist already? What about this:
> 
> int snd_names_list(const char *iface, snd_devname_t **list)
> Give a list of device names and associated comments for selected interface. 
> 

No, that's something different (and does not even work here):

$ aplay -n
ALSA lib names.c:173:(snd_names_list) cannot access
file /etc/asound.names
aplay: names_list:199: snd_names_list error: No such file or directory

Lee



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