Re: [Discuss-gnuradio] how to implement synchronous source block correctly ?

[Martin Braun (CEL)]

On Thu, Dec 05, 2013 at 02:05:31AM -0800, Artem Pisarenko wrote:
> Btw, this restriction frustrating. Someone would like to make useful graph
> containing both audio source and sink in single chain, but it's impossible
> due to current GNU Radio design.

It's not impossible. The very first thing I did in GNU Radio (~6 years ago)
was feed my mic input into an FM modulator and transmit that. That's 2
hardware clocks right there.

If you *directly* connect audio source to sink, you can run into the
problems you describe -- depending on the backend (my intuition says,
Jack would handle that better than ALSA, haven't tried).

> I think it would be better to implement such scheduler which do
> synchronization itself (using software generator or some external source
> provided by user). Optionally, of course. Maybe it wouldn't be such flexible
> in this case, but overall effect is better. I guess authors considered this
> variant but abandoned it by some reasons...

Let's close this thread. Artem, if you have any specific questions
please ask them in a new thread. I'd also like to ask everyone to stay
respectful towards other people on this list and be appreciative of
people spending their free time towards helping out.

Martin

-- 
Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)

Dipl.-Ing. Martin Braun
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KIT -- University of the State of Baden-Württemberg and
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