Re: HDSP 9652: Input channel corruption

[Mark Knecht <markknecht@comcast.net>]

On Wed, 2003-10-08 at 20:12, Nick Arnold wrote:
> The symptoms:
> ------------
> 
> We connect a sine wave to the first 12 channels and record them, and see
> three channels -- 0, 4, and 8 -- are "corrupted".  The remaining channels
> appear to be well-formed and look as we expect them to.

When you say the 'first 12 channels', are you speaking of the
alsa:playback channels, or are you attaching a sine wave the the ADAT
input channels from an external source? I'm not clear on that.

> 
> It seems most likely to be some code in the driver, or perhaps the mixer is
> responsible for this incorrect ordering.

OK, first, I apologize, but Thomas and I never looked at 96KHz
operation, and to the best of my knowledge it was only our debug that
went into the Aug. 27th patch. I think this means you are on new ground.

Thomas and I saw a similar problem at 44.1KHz with ADAT input signals at
one point. In hdspmixer I was getting green audio and yellow peak
information that did not make sense. I do not remember how I came to the
conclusion that there was an ordering problem, but Thomas pretty quickly
found it once I pointed it out. Possibly we only fixed normal speed
operation and missed the double speed equivalent problem.

> 
> The questions are:
> 
>     - could this be a bug, perhaps in the hdsp driver?

I think possibly yes.

> 
>     - alternatively, could this be due to some mixer setting that has been
>       turned on by default unbeknownst to us?  if so, how can we turn this
>       off?

I do not think this is likely, or at least I do not know of anything you
can do.

> 
> any help much appreciated,

I think I'm not helping much...

> 
> nick.




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