Dear Sir, Let me explain the reason of why to use the function: set_min_noutput_items().
I am creating a custom interpolator block. Says, the interpolation factor is 1000. Hence it is important to call set_output_multiple(1000). Meanwhile, for this block the interpolation factor depends on Sample Rate (samp_rate). In this flow-graph the samp_rate could be changed by the user during runtime. This means the interpolation factor may change during runtime, and hence we need to call set_output_multile() with different values during runtime ! The problem arisen when there is no guarantee that set_output_multiple() will work if you change it on the fly. (Refer http://lists.gnu.org/archive/html/discuss-gnuradio/2010-11/msg00504.html) The workaround is to use set_min_noutput_items() if it work on the fly. Says, after changing samp_rate, the new interpolation factor is recalculated as 800. If the set_output_multiple(800) doesn't work, the general_work() can still consume 1 input and produce 800 output if the noutput_items is at least 800. This enables the flow graph continue to work. If the noutput_items is less than 800, the only correct thing the general_work() can do is to consume_each(0) and return 0. This may be problematic and can cause unforeseen behavior. So it is important to make sure the noutput_items is at least 800. Hence I call: set_min_noutput_items(800) This means we can make use of set_min_noutput_items() as a workaround, if set_output_multiple() doesn't change on the fly. The questions are: 1). Can we use this to change setting on the fly: set_min_noutput_items() 2). Is there any better workaround for this? Regards, Activecat On Thu, Mar 6, 2014 at 11:36 PM, Tom Rondeau <t...@trondeau.com> wrote: > On Thu, Mar 6, 2014 at 2:12 AM, Activecat <active...@gmail.com> wrote: > > Dear Sir, > > > > In c++ we have: set_min_noutput_items() > > What is it equivalent syntax in python ? > > > > I try this: > > self.set_min_noutput_items() > > > > Error message: > > AttributeError: 'quadrator_upconverter_python1' object has no attribute > > 'set_min_noutput_items' > > > > Note: > > The self.set_output_multiple() in python seems accepted, is it functional > > ..? > > > > Regards, > > Activecat > > Looks like when this feature was added, it didn't make it into the > block.i swig file. I'll push a patch for this soon. > > But before you try and use this, be very careful. This is an advanced > issue that's really only meant to be used if you a) really really need > it and b) really really know what you are doing and why. > > Tom >
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