[Difx-users] Question : What library/code is DiFX using to read VDIF files

[Adam Deller]

Hi Stuart,

mpifxcorr uses mark5access to unpack VDIF samples.  The vdifio library that
is also included with DiFX is quite limited - apart from what Chris already
noted, I believe it doesn't support legacy VDIF.  Without any disrespect to
anyone who worked on it (including me :) ) it was really a fairly quick
hack to support some simple utilities.

Now, dspsr I think based some of its VDIF support code on vdifio.  Paul
Demorest first made a copy of vdifio onto git - whether it ultimately
became an external mirror of the vdifio hosted on SVN in DiFX or if it has
branched off (and had functionality added) I'm actually not sure.

I know dspsr is capable of processing the VDIF-formatted data produced by
the VLA tied array system, so I'm pretty sure that unpacking is already
available in dspsr somewhere!  I'd suggest checking with Paul Demorest,
since he is definitely the key person for VDIF in dspsr.

Cheers,
Adam

On Fri, 20 Mar 2020 at 10:32, Stuart Weston via Difx-users <
difx-users at listmgr.nrao.edu> wrote:

> >> If your question is a licensing one
>
>
>
> Nope its not that.
>
>
>
> So I take it DiFX uses Mark5access, yes ?
>
>
>
> Stuart Weston
>
>
>
> Mobile: 021 713062
>
> Skype: stuart.d.weston
> Email:  stuart.weston at aut.ac.nz
>
> http://www.atnf.csiro.au/people/Stuart.Weston/index.html
>
> Software Engineer
> Institute for Radio Astronomy & Space Research (IRASR)
> School of Engineering, Computer and Mathematical Sciences
> Faculty of Design and Creative Technologies
> Auckland University of Technology, New Zealand.
>
> http://www.irasr.aut.ac.nz/
>
>
>
> *From:* Phillips, Chris (CASS, Marsfield) <Chris.Phillips at csiro.au>
> *Sent:* Friday, 20 March 2020 11:43 AM
> *To:* Stuart Weston <stuart.weston at aut.ac.nz>
> *Cc:* difx-users at listmgr.nrao.edu
> *Subject:* Re: [Difx-users] Question : What library/code is DiFX using to
> read VDIF files
>
>
>
> Hi Stuart
>
>
>
>
>
>
>
> Just wondering if we can use the DiFX VDIF library/code instead ?
>
>
>
>
>
> It is not clear what your question actually is.
>
>
>
> The initial VDIFIO library I wrote had *no* sampling unpacking routines.
> Others may had added some, I am not sure. Without that the answer would be
> essentially be no. VDIFIO is in no way a plug in replacement for
> mark5access.
>
>
>
> If your question is a licensing one, then yes as all of DFIX is GPLv3 now.
>
>
>
> Cheers
>
> Chris
> _______________________________________________
> Difx-users mailing list
> Difx-users at listmgr.nrao.edu
> https://listmgr.nrao.edu/mailman/listinfo/difx-users
>


-- 
!=============================================================!
A/Prof. Adam Deller
ARC Future Fellow
Centre for Astrophysics & Supercomputing
Swinburne University of Technology
John St, Hawthorn VIC 3122 Australia
phone: +61 3 9214 5307
fax: +61 3 9214 8797

office days (usually): Mon-Thu
!=============================================================!
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listmgr.nrao.edu/pipermail/difx-users/attachments/20200320/d06d9b1f/attachment.html>