[alsa-devel] How to find sampling rate supported

Takashi Iwai tiwai at suse.de
Mon Mar 23 11:03:26 CET 2009

At Sun, 22 Mar 2009 09:00:00 -0700 (PDT),
reetesh chandran wrote:
> Hi all,
> I am new to the group and to Alsa.
> For our project, we have to find the max sampling rate and other pcm hardware parameters that the connected USB headset supports. I looked at the alsa library, but could not find an API which returned this information. 
> I found snd_pcm_hw_params_test_* function to test a specific value is supported, but I was wondering if there was a way to query the device to get the values. 

The min / max can be obtained via *_get_rate_min() and *_get_rate_max(),
at least.  The other detailed information can't be get except for testing
the explicit value via *_test_rate(), so far.



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