Re: Getting actual sample rate

[Eric Allamanche <alm@iis.fhg.de>]

Thanks for feedback,

Martin Langer wrote:
> On Tue, Jun 10, 2003 at 12:24:21PM -0400, Paul Davis wrote:
> 
>>>I'm using a digital Hammerfall audio card and was wondering how to 
>>
>>which hammerfall? digi9652 or hdsp9652?

I think it's an older digi9652, I have to open the PC to check it out

>>the ALSA hardware parameter model doesn't include the notion of an
>>"external rate". 

Is this is a design flaw? How to tell the input frequency? Need some 
additionnal hardware?

>>there is no way to differentiate between an ADAT signal at 32/44.1/48
>>kHz and a "bit/channel stream format" at 64/88.2/96 kHz. so we can't
>>tell you that. however, on the hdsp series, the "External Rate"
>>control (read only) can be used to check the rate. i don't know
>>off hand whether it can be used for notifications via blocking on
>>read/poll for the control.
>>
> 
> 
> Up to now, I thought ADAT was only defined for 44.1 and 48 kHz, but maybe
> I'm wrong in this point. Ok, I believe that the hw doesn't use a restriction in
> that point. But are there really any devices that can handle all those rates.

I checked it again, ADAT is only defined for 44.1/48 kHz. I mixed it up 
with the Hammerfall specifications in the manual. The supported 
frequencies ranges from 32 to 96kHz (SPDIF mode?)

Eric



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