GNU Radio Manual and C++ API Reference
3.9.1.0
The Free & Open Software Radio Ecosystem
test_tag_variable_rate_ff.h
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/* -*- c++ -*- */
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/*
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* Copyright 2015 Free Software Foundation, Inc.
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*
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* This file is part of GNU Radio
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*
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* SPDX-License-Identifier: GPL-3.0-or-later
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*
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*/
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#ifndef INCLUDED_GR_TEST_TAG_VARIABLE_RATE_FF_H
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#define INCLUDED_GR_TEST_TAG_VARIABLE_RATE_FF_H
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#include <
gnuradio/block.h
>
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#include <
gnuradio/blocks/api.h
>
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namespace
gr
{
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namespace
blocks {
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/*!
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* \brief Used for testing tag propagation.
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* \ingroup measurement_tools_blk
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* \ingroup stream_tag_tools_blk
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* \ingroup debug_tools_blk
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*
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* This block resamples the stream by a factor that starts at 0.5
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* but varies around by some random walk. The relative rate of the
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* block is initialized to 0.5 and the random number generator is
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* seeded based on the time. For each input, if the random number
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* is >= 0.5, the relative rate is increased by \p update_step;
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* otherwise, it is decreased by \p update_step.
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*
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* The rate of the change of the resampling factor is set by the
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* flag \p update_once. If this is set to true, then the rate is
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* only updated once per work function. If it is set to false
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* (default), then the rate is changed with every input sample.
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*
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* The block's ctor sets the propagation policy to TPP_DONT to
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* stop tags from automatically propagating. Instead, we handle
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* the tag propagation ourselves from within the work
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* function. Because the relative_rate changes so fast, the tag
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* placement cannot be based on a single factor after the call to
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* work and must be handled when the samples are and based on the
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* current resampling rate.
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*/
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class
BLOCKS_API
test_tag_variable_rate_ff
:
virtual
public
block
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{
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public
:
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// gr::blocks::test_tag_variable_rate_ff::sptr
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typedef
std::shared_ptr<test_tag_variable_rate_ff>
sptr
;
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/*!
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* Build a test_tag_variable_rate_ff block.
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*
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* \param update_once Update the resampling rate once per call
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* to work (default=false).
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* \param update_step How much to adjust the resampling rate by
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* when the update occurs (default=0.001).
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*/
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static
sptr
make(
bool
update_once =
false
,
double
update_step = 0.001);
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};
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}
/* namespace blocks */
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}
/* namespace gr */
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#endif
/* INCLUDED_GR_TEST_TAG_VARIABLE_RATE_FF_H */
block.h
api.h
BLOCKS_API
#define BLOCKS_API
Definition:
gr-blocks/include/gnuradio/blocks/api.h:18
gr::blocks::test_tag_variable_rate_ff
Used for testing tag propagation.
Definition:
test_tag_variable_rate_ff.h:46
gr::block
The abstract base class for all 'terminal' processing blocks.
Definition:
block.h:59
gr
GNU Radio logging wrapper for log4cpp library (C++ port of log4j)
Definition:
basic_block.h:29
gr::blocks::test_tag_variable_rate_ff::sptr
std::shared_ptr< test_tag_variable_rate_ff > sptr
Definition:
test_tag_variable_rate_ff.h:50
gr-blocks
include
gnuradio
blocks
test_tag_variable_rate_ff.h
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