linux-kernel - Re: raw1394 problems galore

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Message-Id: <200610161921.22847.dan@dennedy.org>
Date:	Mon, 16 Oct 2006 19:21:22 -0700
From:	Dan Dennedy <dan@...nedy.org>
To:	linux1394-user@...ts.sourceforge.net
Cc:	Stefan Richter <stefanr@...6.in-berlin.de>,
	Gene Heskett <gene.heskett@...izon.net>,
	For users of Fedora Core releases 
	<fedora-list@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: raw1394 problems galore

On Monday 16 October 2006 2:38 pm, Stefan Richter wrote:
> Gene Heskett wrote:
> > kino-0.8 receives video from it in real time and is doing so right now,
> > and can capture it to file, and then play/edit that file, or could
> > saturday when I last tried it.  I ASSume that kino-0.9.2 could also
> > play/edit that file, but have not verified that by reinstalling 0.9.2.
> ...
> > I was told it was a total rewrite of bad code when I complained about a
> > year ago.  My reply at the time was that it worked, and I don't often
> > fix things that are working.  I'm getting lazy in my dotage I guess.
>
> I don't remember what was changed at that time. Maybe that was the
> addition of the new isochronous interface that I mentioned. The old one
> was (is?) still there but maybe there were interactions... 

Allow me to help clarify. There are 4 interfaces for capturing DV--I kid you 
not! One is video1394, which Kino has never supported for capture. Kino 0.8.0 
supports legacy raw1394 and dv1394 switchable via Preferences. Gene is using 
the legacy raw1394 in that version, based upon a screenshot he sent. Kino 
0.9.2 supports dv1394 and libiec61883 (atop raw1394 rawiso) switchable ONLY 
at build time requiring an explicit configure option for dv1394. This is to 
coerce builders to the newest and best capture interface.

> However this  is not related to the inability to issue AV/C commands, which
> are issued asynchronously.  

Correct; it is very curious that his device is not recognized via configROM 
probes and does not respond to AV/C control commands. This now impacts Kino 
0.9.2 with libiec61883 (Gene's configuration) because I simplified the UI for 
the typical case--the one where 1394 asynch works. In that case, the first 
recognized camera during a bus traversal (or selectable via a simple pulldown 
menu) lets Kino determine on which 1394 port this device sits in order to 
make capture "just work." (permissions issues to /dev/raw1394 aside :-) It is 
very rare that someone can capture but not have AV/C and device recognition. 
The majority of problem reports are just the opposite with the majority 
resolved by unloading eth1394!

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