[alsa-devel] How to tell user level hardware not support a certain format in a certain sample rate

Clemens Ladisch clemens at ladisch.de
Mon Mar 2 16:58:42 CET 2009

Richard Zhao wrote:
> runtime->hw.rates and runtime->hw.formats indicate the rate and
> formats hardware can support, so the user level plugins can
> auto-convert the audio data. But hardware may not support a certain
> combin of sample rate and format,

Did you install your own constraint rules, as described in section
"Constraints" of "Writing an ALSA Driver"?

Best regards,

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