[alsa-devel] [Alsa-user] How to get set/fixed sample rate of ALSA device?

Rene Herman rene.herman at keyaccess.nl
Mon Oct 8 01:52:26 CEST 2007

On 10/08/2007 12:41 AM, Mark Constable wrote:

> Any chance that your program could take an arg to investigate
> other cards (or perhaps plugins) and also return an errno so
> it could be used in scripts ?

Only if you promise to never drop CCs again (although I don't know about 

>  # gcc -W -Wall -o snd_rate snd_rate.c -l asound
>  snd_rate.c: In function 'main':
>  snd_rate.c:14: warning: the address of ‘params’ will always evaluate as 'true'

That's the ALSA snd_pcm_hw_params_alloca(). No such warning here, but I've 
made it a regular malloc.

>  # snd_rate
>  snd_pcm_open: Device or resource busy
> In fact, why isn't there a single simple "alsainfo" type
> program that tells a user some (or a lot) of info about
> their hardware and alsa-lib install ?

I guess because noone wrote one :-)

It seems by the way that dir != 0 _can_ be returned for hw devices, and this 
just ignores it. Just some rounding issue I guess.


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