From mboxrd@z Thu Jan  1 00:00:00 1970
From: Clemens Ladisch <clemens@ladisch.de>
Subject: Re: How to tell user level hardware not support
 a	certain format in a certain sample rate
Date: Mon, 02 Mar 2009 16:58:42 +0100
Message-ID: <49AC0232.1060909@ladisch.de>
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To: Richard Zhao <linuxzsc@gmail.com>
Cc: alsa-devel <alsa-devel@alsa-project.org>
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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,
Clemens