[Protux-devel] [Fwd: Re: [Alsa-devel] available sampling rate detection]

[Martin Herren]

At Tue, 11 Feb 2003 08:53:59 +0100,
Martin Herren wrote:
> Hej,
>
> i'm new on this list as well as to alsa.
>
> We need to find out the supported sampling rates (and other parameters) for the 
> pcm devices of soundcards.
>
> We used snd_pcm_hw_params_test_rate() for this, which according to the 
> documentation 
> (http://www.alsa-project.org/alsa-doc/alsa-lib/group___p_c_m___h_w___params.html#a53)
> should return 1 if the rate is available, 0 otherwise.
> The problem is that it always returned an non-null value, for any rate even if 
> we knew it wasn't supported.
>
> Then we found out that we need to call snd_pcm_hw_params_any() first, and then 
> snd_pcm_hw_params_test_rate() returns 0 for supported rates, and a negativ 
> value (-22) otherwise.

the documentation is wrong.  the test functions return zero if
supported and a negative value if not supported, as well as the set
functions do.


Takashi


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