Re: [Discuss-gnuradio] To implement WiMAX with GnuRadio or not?

[Alexander Chemeris]

On Thu, May 26, 2011 at 18:10, Marcus D. Leech <address@hidden> wrote:
> On 26/05/2011 9:55 AM, Michael Dickens wrote:
>>
>> It would be great if you could share with the list example code snippets
>> of how you do the pipes.  For example: Where in an online repository one can
>> find such code.
>>
>> I think that's what Jeff was getting at: that "we" are providing IANAL
>> advice rather than code examples.  I, for one, have never actually tried the
>> pipes -- I've just heard that they are possible and that using them does not
>> form a "greater work" in the GPL sense. - MLD
>>
>>
>> _______________________________________________
>
> Actually, my SIDSuite code uses this a little bit, in that data recording is
> handled outside of Gnu Radio.  The basic idea is that there's
>  a shell script that sets up the environment (creates the FIFO files, starts
> the external programs in the background, etc), then the
>  Gnu Radio flow-graph is called.  The flow-graphs just use "File Source" and
> "File Sink" with buffering turned off--as far as Gnu Radio
>  is concerned, it's writing to a file, but in fact, it's a FIFO file or
> "named pipe".
>
> See:
>
> http://www.sbrac.org/files/sidsuite.tar.gz
>
> It doesn't do it as much as other code that I've written, but it gives one a
> flavour for how the pipes are used.

Cool!
It would be truly great to see a simplified example of this in the
GnuRadio repository, and at least somehow mentioned on the wiki.

> The other "trick" that I use is to use the XMLRPC server stuff that Josh put
> in GRC--it allows you to set flowgraph variables from an
>  outside program, which is really great!

Hum. Any examples?

I also wonder - have you quantified overhead of those methods - in
latency, jitter, memory, etc?

-- 
Regards,
Alexander Chemeris.