From: Robert William Fuller <hydrologiccycle@gmail.com>
To: Trent Piepho <xyzzy@speakeasy.org>
Cc: v4l-dvb-maintainer@linuxtv.org, video4linux-list@redhat.com,
Jean Delvare <jdelvare@suse.de>
Subject: Re: [v4l-dvb-maintainer] bttv driver questions
Date: Tue, 26 Aug 2008 22:59:52 -0400 [thread overview]
Message-ID: <48B4C328.2040502@gmail.com> (raw)
In-Reply-To: <Pine.LNX.4.58.0808261911000.2423@shell2.speakeasy.net>
Trent Piepho wrote:
> On Wed, 27 Aug 2008, Daniel [iso-8859-1] Gl�ckner wrote:
>> On Mon, Aug 25, 2008 at 08:40:51PM -0400, Andy Walls wrote:
>>> On Mon, 2008-08-25 at 14:45 +0200, Jean Delvare wrote:
<snipped>
>> The driver fills buffers with instructions for the DMA engine, one buffer
>> for the top field and one for the bottom field. These instructions tell
>> the engine where to write a specific pixel. For interlaced video the
>> instructions for the top field write to line 0, 2, 4, ... in memory and for
>> the bottom field to line 1, 3, 5, ... .
>
> Keep in mind that _either_ field can be transmitted first. I.e., in some
> cases one first writes lines 1,3,5 then lines 0,2,4. I'm not sure if bttv
> supports both field dominances or not, but I think it does.
My particular board always returns top field first on capture. I don't
know if that helps.
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next prev parent reply other threads:[~2008-08-27 3:00 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200808251445.22005.jdelvare@suse.de>
2008-08-26 0:40 ` [v4l-dvb-maintainer] bttv driver questions Andy Walls
2008-08-26 23:29 ` Daniel Glöckner
2008-08-27 2:20 ` Trent Piepho
2008-08-27 2:59 ` Robert William Fuller [this message]
2008-08-28 19:43 ` Trent Piepho
2008-08-27 3:45 ` Andy Walls
2008-08-28 19:48 ` Trent Piepho
[not found] ` <200808281611.38241.jdelvare@suse.de>
2008-08-28 20:20 ` Daniel Glöckner
2008-08-28 21:42 ` hermann pitton
[not found] ` <200808301201.47561.jdelvare@suse.de>
2008-08-30 15:12 ` Daniel Glöckner
2008-08-31 16:37 ` Andy Walls
[not found] ` <200809011144.54233.jdelvare@suse.de>
2008-09-01 12:35 ` Daniel Glöckner
[not found] ` <200809012126.06532.jdelvare@suse.de>
2008-09-01 22:54 ` Daniel Glöckner
[not found] ` <200809021109.31007.jdelvare@suse.de>
[not found] ` <200809021305.12318.jdelvare@suse.de>
2008-09-03 22:29 ` Daniel Glöckner
[not found] ` <200809051436.18549.jdelvare@suse.de>
2008-09-05 15:51 ` Daniel Glöckner
2008-09-05 19:16 ` [v4l-dvb-maintainer] " Trent Piepho
[not found] ` <200808281658.28151.jdelvare@suse.de>
2008-08-29 12:09 ` Andy Walls
2008-08-29 22:23 ` Trent Piepho
2008-08-30 0:10 ` Daniel Glöckner
[not found] ` <200808300954.19361.jdelvare@suse.de>
2008-08-30 16:44 ` Daniel Glöckner
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