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test_tag_variable_rate_ff.h
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/* -*- c++ -*- */
/*
* Copyright 2015 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifndef INCLUDED_GR_TEST_TAG_VARIABLE_RATE_FF_H
#define INCLUDED_GR_TEST_TAG_VARIABLE_RATE_FF_H
#include <gnuradio/block.h>
#include <gnuradio/blocks/api.h>
namespace gr {
namespace blocks {
/*!
* \brief Used for testing tag propagation.
* \ingroup measurement_tools_blk
* \ingroup stream_tag_tools_blk
* \ingroup debug_tools_blk
*
* This block resamples the stream by a factor that starts at 0.5
* but varies around by some random walk. The relative rate of the
* block is initialized to 0.5 and the random number generator is
* seeded based on the time. For each input, if the random number
* is >= 0.5, the relative rate is increased by \p update_step;
* otherwise, it is decreased by \p update_step.
*
* The rate of the change of the resampling factor is set by the
* flag \p update_once. If this is set to true, then the rate is
* only updated once per work function. If it is set to false
* (default), then the rate is changed with every input sample.
*
* The block's ctor sets the propagation policy to TPP_DONT to
* stop tags from automatically propagating. Instead, we handle
* the tag propagation ourselves from within the work
* function. Because the relative_rate changes so fast, the tag
* placement cannot be based on a single factor after the call to
* work and must be handled when the samples are and based on the
* current resampling rate.
*/
class BLOCKS_API test_tag_variable_rate_ff : virtual public block
{
public:
// gr::blocks::test_tag_variable_rate_ff::sptr
typedef std::shared_ptr<test_tag_variable_rate_ff> sptr;
/*!
* Build a test_tag_variable_rate_ff block.
*
* \param update_once Update the resampling rate once per call
* to work (default=false).
* \param update_step How much to adjust the resampling rate by
* when the update occurs (default=0.001).
*/
static sptr make(bool update_once = false, double update_step = 0.001);
};
} /* namespace blocks */
} /* namespace gr */
#endif /* INCLUDED_GR_TEST_TAG_VARIABLE_RATE_FF_H */
gr::block
The abstract base class for all 'terminal' processing blocks.
Definition gnuradio-runtime/include/gnuradio/block.h:63
gr::blocks::test_tag_variable_rate_ff
Used for testing tag propagation.
Definition test_tag_variable_rate_ff.h:47
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::test_tag_variable_rate_ff::make
static sptr make(bool update_once=false, double update_step=0.001)
block.h
api.h
BLOCKS_API
#define BLOCKS_API
Definition gr-blocks/include/gnuradio/blocks/api.h:18
gr
GNU Radio logging wrapper.
Definition basic_block.h:29