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From: Hans Petter Selasky <hselasky@c2i.net>
To: Ariff Abdullah <ariff@freebsd.org>
Date: Tue, 27 Jul 2010 19:14:38 +0200
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Cc: freebsd-multimedia@freebsd.org
Subject: Re: Audio phase inversion quirk?
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On Tuesday 27 July 2010 19:04:05 Ariff Abdullah wrote:
> On Tue, 27 Jul 2010 18:04:23 +0200
> 
> Hans Petter Selasky <hselasky@c2i.net> wrote:
> > Hi,
> > 
> > I've discovered using my qecholo tool that many USB audio devices
> > have  switched the polarity of the audio signal. I guess not so many
> > people are  checking this, but I'm one of them :-)
> > 
> > There is currently a quirk for switching left and right channels. Is
> > there a  sound stack quirk in FreeBSD for correcting the phase? This
> > is just a matter  of negating the samples before passing along to
> > the application.
> 
> How about make the driver advertise the opposite sign or endian as
> supported formats?
> 
> 

Sounds OK. Then I would just add the opposite sign like OR'ing a flag into the 
snd_fmt value?

--HPS