[AG-DEV] UCL common library & VPMedia

[Christoph Willing]

On 05/06/2009, at 1:15 AM, Andrew Ford wrote:

> Hi Tom,
>
> Thanks, I was able to compile VPMedia with that copy of common.  
> Judging by the differences between the two, it looks like  
> set_umtp_dest got removed entirely. Piers, is this expected?
>
> I started attempting to compile VP, but I'm running into some issues  
> with the SConstruct script:
> -the check for XMLRPC fails, and it seems to have had some major API  
> changes (assuming the xmlrpc-c in the Ubuntu package repository is  
> the most recent), so that won't be usable without major changes in VP,
> -the TryLink for GLEW fails, but when I try to run the code  
> standalone it works fine,
> -the script itself breaks:
> TypeError: list indices must be integers:
>   File "/home/andrew/work/VP/VP/SConstruct", line 702:
>     print env['CPPDEFINES']['VP_VERSION']
>
> env['CPPDEFINES'] should be a dictionary, but at some point it  
> apparently gets turned into a list. I think this happens in  
> myParseConfig, but it's hard to tell as my Python is pretty weak.  
> Has anyone worked with VP/successfully compiled it recently?


Andrew,

Recently, yes; with that particular version of common, no.


Successful compilation is with, amongst others, Ubuntu Jaunty. The  
patches and methodology can be extracted from the Ubuntu source tarball:
     http://www.vislab.uq.edu.au/debuntu/jaunty/vpcscreen_0.2-3.tar.gz

Unpack it to find a vpcscreen-0.2 directory tree or, if you have the  
UQVislab repo added to your sources, run:
     apt-get source vpcscreen
which will create the vpcscreen-0.2 directory tree.

In the directory tree, the build methodology will be found in the  
debian/rules file and prerequisite packages are named in debian/ 
control.  The build is actually in two parts. You'll see that in the  
debian/rules file (its actually a Makefile) is where all the patches  
are applied (each new release seems to need additional patching) and  
the patches themselves are found in debian/patches. An external  
script, debian/buildag.sh, is invoked to do the actual building and  
then creating the vpcscreen service. Its a bit tortuous because the  
methodology goes back to when I was first learning how to make Debian  
& Ubuntu packages and, with each new release, I've just been updating  
version numbers and patches as required. I'd do it differently if I  
were starting again now.

A possibly more transparent method can be seen in the Slackware build  
script; a tarball of the script & patches is attached below.

In both cases, the supplied common is used, rather than the latest UCL  
version but maybe you'll find some bits there that'll help you with  
your UCL common quest.


chris


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> --Andrew
>
> 2009/5/28 Thomas Uram <turam at mcs.anl.gov>
>
> There is a copy of common in the if-media SVN, against which I've  
> built VPMedia successfully. That may help you.
>
> If your goal is more toward having it compile against UCL common, in  
> which case we could eliminate the if-media/common, I'd be all for  
> it. Piers may be able to comment on the changes in common that you  
> mentioned.
>
> Tom
>
>
>
> On May 28, 2009, at 10:10 AM, Andrew Ford wrote:
>
> Hi,
>
> Has anyone tried to compile the VPMedia library lately? There seem  
> to be some discrepancies between it and the latest version of the  
> UCL common library, particularly with rtp.h/.c:
>
> -the RTP option RTP_OPT_WEAK_VALIDATION has apparently been changed  
> to RTP_OPT_WAIT_FOR_RTCP - is it safe to change instances of the  
> former (there's one in VPMSession_net.cpp:82 in VPMedia) to the  
> latter? Do they mean the same thing?
>
> -In VPMSession_net.cpp:438, there's a use of the function  
> rtp_set_umtp_dest, which has a prototype in rtp.h but no actual  
> definition in rtp.c. Thus, anything that tries to use VPMedia will  
> fail to link, saying undefined reference to `rtp_set_umtp_dest'.  
> This in turn prevents even attempting to compile VP (my actual goal)  
> since it checks whether VPMedia is linkable in its scons configure  
> stage. Is this function supposed to be unimplemented, and if so,  
> does anyone know why it's being used in VPMedia?
>
> Any info on these issues would be greatly appreciated.
>
> Thanks,
> --Andrew
>
>

Christoph Willing                       +61 7 3365 8316
QCIF Access Grid Manager
University of Queensland