Re: [Jack-Devel] incompatible version of ffado error message

On Wed, 2012-05-02 at 08:29 +1000, Allan Klinbail wrote:
> On Tue, 2012-05-01 at 09:38 +0930, Jonathan Woithe wrote:
> > On Mon, Apr 30, 2012 at 03:35:54PM +0200, Adrian Knoth wrote:
> > > On Mon, Apr 30, 2012 at 11:26:32PM +1000, Allan Klinbail wrote:
> > > > I've been using jack with ffado as the driver for a few years now.
> > > > Today, after upgrading ffado to the latest svn , (then tested working).
> > > > I then upgraded to the latest jack svn version. Following this I started
> > > > receiving the following incompatible error message. 
> > > 
> > > You were doing it in the wrong order.
> > > 
> > > FFADO detects the jackd version at compile time. If it's a new jackd
> > > version supporting the new API, it switches to the new API.
> > 
> > Similarly, if there is no jackd installed at compile time ffado assumes that
> > the jackd which will ultimately be available will support the new API.
> > 
> > So in Allan's case, he compiled a new FFADO against an old jack, which
> > resulted in a FFADO which uses the old API.  The old jack was happy with
> > this and everything worked.
> > 
> 
> I tried this in a few different ways in the end .. Same result. 
> 
> 
> 
> > > You've just told FFADO to adjust itself to an old jackd version.
> > > Simply compile FFADO again.
> > 
> > Yep, that should work.
> > 
> > However, from a development point of view I'm a little surprised that the
> > latest jackd didn't simply accept FFADO as it was.  The relevant line in
> > current jack1 is drivers/firewire/ffado_driver.c, line 786 and following.
> > 
> >   if(ffado_get_api_version() < FIREWIRE_REQUIRED_FFADO_API_VERSION) {
> >     printError("Incompatible libffado version! ...
> >   }
> > 
> > The same conditional is used in jack2, so the following analysis applies
> > equally to that.
> > 
> > In Allen's case, ffado_get_api_version() would return 8 (the old version).
> > FIREWIRE_REQUIRED_FFADO_API_VERSION is defined as 8, so this conditional
> > *should* have failed and the "Incompatible libffado version" message should
> > never have been displayed.
> > 
> > Oh hang on: Allan, you said "the latest jack svn version".  Did you
> > literally use jack's subversion repository?  That is no longer carrying the
> > latest jackd source as far as I know: if you want the latest jackd you need
> > to get it using git.  This is described at
> > 
> >   http://jackaudio.org/download
> 
> 
> Okay, jackd was built from the "live" ebuild in the gentoo pro-audio
> repository, I would have to look at the ebuild for that to determine if
> it was taking the older svn version or the git version. 
> 
> 

and there lies the problem ..

DESCRIPTION="Jackdmp jack implemention for multi-processor machine"
HOMEPAGE="http://www.grame.fr/~letz/jackdmp.html"

ESVN_REPO_URI="http://subversion.jackaudio.org/jack/jack2/trunk/jackmp"

LICENSE="GPL-2"
SLOT="0"
KEYWORDS=""

 

it's using SVN.. I will report this back to the gentoo pro-audio list 


> 
> 
> > 
> > Look for the "JACK Source Code Repository" section about half-way down.
> > 
> > I don't know the state of jack's ffado driver in the old svn repository, but
> > the use of the older jack code (which could be in an unstable intermediate
> > state with respect to ffado driver updates) may explain the symptoms
> > described.
> > 
> > Regards
> >   jonathan
> 

1335911757.5475_0.ltw:2,a <1335911565.9393.3.camel at srv3 dot little-wolf dot local>