Re: [Discuss-gnuradio] Proposed update to WAV file sink

[Marcus D. Leech]

On 04/15/2012 01:42 PM, Marcus D. Leech wrote:
> Currently, the XML for the WAV file sink uses a "file_save" type for 
> the filename variable.  This looks like it precludes setting the 
> filename at runtime, and thus having a callback that allows you to 
> switch to a new output filename at runtime.
>
> So, I'm proposing changing it to a "string" type in the XML, and 
> inserting a callback on that parameter so the value can be changed at 
> runtime,
>   calling the "open" method that's part of the gr_wavfile_sink::  class.
>
> I'm open to other ideas.  But this allows me to provide a convienient 
> "Record" feature in the apps I have that produce audio outputs, and to
>   conditionally have it record to a file of my choosing, or /dev/null, 
> depending on whether I have recording enabled or not.
OK, so I found that the default 'file_save' type is willing to accept 
Python expressions, so the only update is to add a callback for that 
particular parameter, so that it can be changed at runtime--the 
underlying C++ code supports this, it's just that it was never exposed 
in the XML.



--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org