Re: [Discuss-gnuradio] Should return the number of input or the number of output?

[Martin Braun]

On 03/09/2014 04:58 AM, Activecat wrote:
> Dear Sir,
> 
> A python sink block created by gr_modtool has below work() function, it
> returns the number of input items.
> 
>     def work(self, input_items, output_items):
>         in0 = input_items[0]
>         # <+signal processing here+>
>         return len(input_items[0])
> 
> But a c++ sink block created by gr_modtool has the work() function
> return the number of output items (noutput_items).
> 
> It sounds contradict. Is there any error happening?

No contradiction. Sinks are always syncs (haha), so noutput_items == the
number of input items (by definition). The actual output buffer,
however, is empty -- so we can't use the length of the output buffer to
tell the scheduler how much we consumed.

In a sync block, there is no argument "ninput_items", so we can't use
that, either.

M