Re: quattro usb-audio endianess conversion layer

[Patrick Shirkey <pshirkey@boosthardware.com>]

Clemens Ladisch wrote:
> Patrick Shirkey wrote:
> 
>>It turns out the reason for the noise in the input channels all this
>>time is due to the quattro only reading big endian at input.
> 
> 
> Does this happen all of the time?  There is a bug report which says
> that it works sometimes.
> 
> 
>>Has anyone had ideas on how to implement a layer that works to
>>automatically convert the quattros big endian input into little endian
>>to enable ease of use with most Linux audio apps?
> 
> 
> With the patch below, it should work with plughw:X.  Does it?
> 

Thanks Clemens.


I finally was able to test the patch and my first impression is that it 
has made a significant difference and should be committed immediately.

I recorded with
	
	arecord -f cd -d 10 -D plughw:2,0 test.wav

played back with

	aplay -f cd -d hw:2,1 test.wav

The sound is much clearer.


My next question is: Does anyone have a good idea how to apply this to a 
jack setup without sacrificing latency?


-- 
Patrick Shirkey - Boost Hardware Ltd.
Http://www.boosthardware.com
Http://www.djcj.org/LAU/guide/ - The Linux Audio Users guide
Http://www.djcj.org/gigs/ - Gigs guide Korea
Http://www.nana7.net - Bar Nana - Itaewon, Seoul, Sth Corea
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