Re: [Discuss-gnuradio] self.set_min_noutput_items() is not a valid python command in gnuradio ?

[Marcus Müller]

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Hi Activecat,

On 08.03.2014 13:54, Activecat wrote:
> Dear Marcus,
> 
> Thanks for pointing out, I've corrected it to std::max. It still
> doesn't seem to produce correct output when the d_iFactor changes 
> on the fly.
> 
> BTW this flow graph consists of other built-in blocks like Low Pass
> Filter, Signal Source etc, whose outputs also depends on the
> instantaneous Sample Rate (samp_rate). If one of these built-in
> blocks doesn't work well when samp_rate changes on the fly, then
> that could cause the flow graph to produce wrong result too.
> 
But, well, these blocks don't change output ratios based on sample_rate..

> My main concern is whether set_output_multiple() and 
> set_min_noutput_items() works on the fly in general. As your answer
> is yes to both, then I think that is good enough for this thread.
:)
> 
> The general_work() is called repeatedly and problematically only if
> it return 0 and consume 0.  With the set_min_noutput_items() works
> on the fly, this problem doesn't happen anymore.  Now the problem
> is the incorrect output when the d_iFactor changes on the fly.
> 
> Meanwhile, as you had advised, I had tried to see the parameters
> that forecast() and general_work() are called with. Refer below
> verbose message. When the flow chart started, the initial values
> are samp_rate=32k, change_rate=64; hence d_iFactor = 32k/64 = 500. 
> At line 24 the samp_rate is changed to 64k on the fly by the user.
> So now d_iFactor = 64k/64 = 1000. Every parameters and return
> values seem to be correct, but the flow graph output becomes wrong
> after line 24.
Wrong in which way?

Greetings,
Marcus
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