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From: "Frej Drejhammar" <frej@sics.se>
To: Devin Heitmueller <dheitmueller@kernellabs.com>
Cc: Linux Media Mailing List <linux-media@vger.kernel.org>
Subject: Re: Chroma gain configuration
Date: Mon, 22 Feb 2010 12:04:13 +0100	[thread overview]
Message-ID: <tz8iq9pjzv6.fsf@dront.sics.se> (raw)
In-Reply-To: <829197381002212007q342fc01bm1c528a2f15027a1e@mail.gmail.com> (Devin Heitmueller's message of "Sun, 21 Feb 2010 23:07:07 -0500")

> I'm asking because it seems a bit strange that someone would introduce
> a v4l2 standard control to disable the AGC but not have the ability to
> manually set the gain once it was disabled.

As the person who introduced V4L2_CID_CHROMA_AGC for cx2388x I can
explain that part. The AGC was actually introduced when only a manual
gain setting was available and the AGC was disabled. The addition of the
V4L2_CID_CHROMA_AGC allowed the AGC to be enabled by default, which is
probably what most users want, but still have a way to set chroma gain
manually. The cx88 driver allows you to set the UV-gain using the
V4L2_CID_SATURATION control when the AGC is disabled.

Regards,

--Frej

  reply	other threads:[~2010-02-22 11:12 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-02-22  4:07 Chroma gain configuration Devin Heitmueller
2010-02-22 11:04 ` Frej Drejhammar [this message]
2010-02-22 11:40 ` Andy Walls
2010-02-22 12:15   ` Mauro Carvalho Chehab
2010-02-22 13:10     ` Devin Heitmueller
2010-02-22 13:40       ` Mauro Carvalho Chehab
2010-02-22 13:47         ` Devin Heitmueller
2010-02-22 13:58           ` Mauro Carvalho Chehab
2010-02-22 21:17             ` Devin Heitmueller
2010-02-22 21:32               ` Mauro Carvalho Chehab
2010-02-22 21:38                 ` Devin Heitmueller
2010-02-22 21:47                   ` Hans Verkuil
2010-02-22 21:41               ` Hans Verkuil
2010-02-22 21:43                 ` Devin Heitmueller
2010-02-22 21:54                   ` Hans Verkuil
2010-02-22 22:00                     ` Devin Heitmueller
2010-02-23  7:53                       ` Hans Verkuil
2010-02-23 14:20                         ` Andy Walls
2010-02-23 14:41                           ` Hans Verkuil
2010-02-23 15:33                             ` Andy Walls
2010-02-23 15:41                               ` Andy Walls
2010-02-23 18:11                               ` My TV's standard video controls (Re: Chroma gain configuration) Andy Walls
2010-02-23 15:15                         ` Chroma gain configuration Devin Heitmueller
2010-02-25  4:39                         ` Devin Heitmueller
2010-02-22 23:50   ` Sakari Ailus

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