From: "Daniel Glöckner" <daniel-gl@gmx.net>
To: Hans Verkuil <hverkuil@xs4all.nl>
Cc: Julia Lawall <julia.lawall@lip6.fr>,
mchehab@infradead.org, linux-media@vger.kernel.org,
joe@perches.com
Subject: Re: question about bt8xx/bttv-audio-hook.c, tvaudio.c
Date: Sat, 9 Jun 2012 23:41:00 +0200 [thread overview]
Message-ID: <20120609214100.GA1598@minime.bse> (raw)
In-Reply-To: <201206091005.16782.hverkuil@xs4all.nl>
On Sat, Jun 09, 2012 at 10:05:16AM +0200, Hans Verkuil wrote:
> On Wed June 6 2012 09:06:23 Julia Lawall wrote:
> > The files drivers/media/video/bt8xx/bttv-audio-hook.c and
> > drivers/media/video/tvaudio.c contain a number of occurrences of eg:
> >
> > mode |= V4L2_TUNER_MODE_LANG1 | V4L2_TUNER_MODE_LANG2;
> >
> > and
> >
> > if (mode & V4L2_TUNER_MODE_MONO)
> >
> > (both from tvaudio.c)
>
> I would have to analyse this more carefully, but the core issue here is that
> these drivers mixup the tuner audio reception bitmask flags (V4L2_TUNER_SUB_*)
> and the tuner audio modes (V4L2_TUNER_MODE_*, not a bitmask). This happened
> regularly in older drivers, and apparently these two are still not fixed.
>
> More info is here:
>
> http://hverkuil.home.xs4all.nl/spec/media.html#vidioc-g-tuner
>
> I can't just replace one define with another, I would need to look carefully
> at the code to see what was intended.
I have an old patch on one of my other machines that should fix this
in tvaudio.c. I'll try to clean it up.
Daniel
next prev parent reply other threads:[~2012-06-09 21:41 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-06 7:06 question about bt8xx/bttv-audio-hook.c, tvaudio.c Julia Lawall
2012-06-09 8:05 ` Hans Verkuil
2012-06-09 21:41 ` Daniel Glöckner [this message]
2012-06-10 1:43 ` Some tvaudio fixes Daniel Glöckner
2012-06-10 6:28 ` Hans Verkuil
2012-06-17 11:53 ` [PATCH] tvaudio: rename getmode and setmode Daniel Glöckner
2012-06-17 12:08 ` Hans Verkuil
2012-06-10 1:43 ` [PATCH 1/9] tvaudio: fix TDA9873 constants Daniel Glöckner
2012-06-10 1:43 ` [PATCH 2/9] tvaudio: fix tda8425_setmode Daniel Glöckner
2012-06-10 1:43 ` [PATCH 3/9] tvaudio: use V4L2_TUNER_MODE_SAP for TDA985x SAP Daniel Glöckner
2012-06-10 1:43 ` [PATCH 4/9] tvaudio: remove watch_stereo Daniel Glöckner
2012-06-10 1:43 ` [PATCH 5/9] tvaudio: don't use thread for TA8874Z Daniel Glöckner
2012-06-10 1:43 ` [PATCH 6/9] tvaudio: use V4L2_TUNER_SUB_* for bitfields Daniel Glöckner
2012-06-10 1:43 ` [PATCH 7/9] tvaudio: obey V4L2 tuner audio matrix Daniel Glöckner
2012-06-10 1:43 ` [PATCH 8/9] tvaudio: support V4L2_TUNER_MODE_LANG1_LANG2 Daniel Glöckner
2012-06-10 1:43 ` [PATCH 9/9] tvaudio: don't report mono when stereo is received Daniel Glöckner
2012-06-10 16:55 ` question about bt8xx/bttv-audio-hook.c, tvaudio.c Julia Lawall
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