Re: Problem with M5455 card

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At Sun, 05 Nov 2006 10:23:58 +0100,
Volker Schroer wrote:
> 
> Hi,
> I hope, this is the right list to post this question.
> I'm porting an Ham- Radio application  from oss to alsa.
> I'm using an ASROCK motherboard with on board sound and an AMD64 dual 
> core. OS is gentoo linux , kernel 2.6.18, alsa-driver 1.0.13, alsa- lib 
> 1.0.13.
> 
> I set the card to FLOAT_LE format.

What did you set exactly?  Set hw_params calls with format = FLOAT_LE
from application? 


> If I read the samples with snd_pcm_readi, I get invalid values ( 10*e34 
> ) from time to time, although  the result code of readi does not signal 
> any errors.
> 
> Is there a way to check if the read values  are valid inside the driver 
> ? I think, there is a problem inside the driver. Using a delta 44 
> soundcard, the problem is gone.

I guess it's rather a conincidence that it worked with another card.
Or, possibly, conversion between S16 and float in alsa-lib plugin
might be broken.


Takashi

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