Hello everyone,
I am currently trying to create a basic block similar to this issue:
https://stackoverflow.com/questions/68289222/gnu-radio-buffer-size
Some software and hardware info:
GNU Radio version: 3.9.3.0
Python version: 3.9.7
OS: Ubuntu 20.04
I always want to work on the same number of items, say 1024. Now I would
like to use up all of the items, but I want to produce something between
say 500 - 1500 items.
For now, I would like to create a simple block with one input and one
output, which consumes a set number of items and outputs only a fraction
of those incoming items in order to understand it better.
Therefore I started with a general block and wanted to change
ninput_items_required[0].
However, ninput_items_required is an integer. Trying to directly change
this integer values results in:
Unable to cast Python instance to C++ type (compile in debug mode for
details)
My second question is about the produce() function. If it is used,
general_work() should return
WORK_CALLED_PRODUCE
but how exactly? After calling produce() and telling the scheduler how
many items are produced, can I then change output_items[0]?
My attempt at the forecast() function and general_work() is provided
below. General suggestions/hints or a basic example would be helpful and
immensely appreciated.
If additional background is required, let me know and I will gladly
provide more information.
def forecast(self, noutput_items, ninput_items_required):
# Estimate, that we will always need self.buffer_len items on
input port [0]
ninput_items_required[0] = self.buffer_len
def general_work(self, input_items, output_items):
# Firstly check, if input_items has a sufficient amount of items
if len(input_items[0]) >= self.buffer_len:
# Then consume exactly self.buffer_len items on input_port[0]
self.consume(0, self.buffer_len)
# Now I would like to only output a fraction of the input items
# say the first self.out_items, on output port[0]
self.produce(0, self.out_items)
# Do I set my output_items[0] here?
# Now I only need to return WORK_CALLED_PRODUCE, but how exactly?
return 0
Kind regards,
Patric Müller
