Date: Wed, 28 Jul 2010 02:02:52 +0800 From: Ariff Abdullah <ariff@FreeBSD.org> To: Hans Petter Selasky <hselasky@c2i.net> Cc: freebsd-multimedia@freebsd.org Subject: Re: Audio phase inversion quirk? Message-ID: <20100728020252.5166f0df.ariff@FreeBSD.org> In-Reply-To: <201007271914.38228.hselasky@c2i.net> References: <201007271804.23993.hselasky@c2i.net> <20100728010405.0b85b13d.ariff@FreeBSD.org> <201007271914.38228.hselasky@c2i.net>
next in thread | previous in thread | raw e-mail | index | archive | help
--Signature=_Wed__28_Jul_2010_02_02_52_+0800_TrFItUOulAY3JcG0
Content-Type: text/plain; charset=US-ASCII
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
On Tue, 27 Jul 2010 19:14:38 +0200
Hans Petter Selasky <hselasky@c2i.net> wrote:
> On Tuesday 27 July 2010 19:04:05 Ariff Abdullah wrote:
> > On Tue, 27 Jul 2010 18:04:23 +0200
> >=20
> > Hans Petter Selasky <hselasky@c2i.net> wrote:
> > > Hi,
> > >=20
> > > 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 :-)
> > >=20
> > > 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.
> >=20
> > How about make the driver advertise the opposite sign or endian as
> > supported formats?
> >=20
> >=20
>=20
> Sounds OK. Then I would just add the opposite sign like OR'ing a
> flag into the snd_fmt value?
>=20
There's no way to correlate those by simple bit fiddling. Perhaps you
should define another uaudio_formats[] so it can be fed into format
probing logic in uaudio.c .
--
Ariff Abdullah
FreeBSD
... Recording in stereo is obviously too advanced
and confusing for us idiot ***** users :P ........
... Going with the standard and orthodox
is the death of intellect ..............
--Signature=_Wed__28_Jul_2010_02_02_52_+0800_TrFItUOulAY3JcG0
Content-Type: application/pgp-signature
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.10 (FreeBSD)
iEYEARECAAYFAkxPH0wACgkQlr+deMUwTNoKdgCfTMORWV1hdHFJmkiyn5RfdgJl
rfMAn3NtsM4qtJaJBYZkkcLTKk+3dWZL
=Pq/E
-----END PGP SIGNATURE-----
--Signature=_Wed__28_Jul_2010_02_02_52_+0800_TrFItUOulAY3JcG0--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20100728020252.5166f0df.ariff>