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/* -*- c++ -*- */
/*
* Copyright 2005,2012 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifndef INCLUDED_FILTER_FFT_FILTER_FFF_H
#define INCLUDED_FILTER_FFT_FILTER_FFF_H
#include <gnuradio/filter/api.h>
#include <gnuradio/sync_decimator.h>
namespace gr {
namespace filter {
/*!
* \brief Fast FFT filter with float input, float output and float taps
* \ingroup filter_blk
*
* \details
* This block implements a real-value decimating filter using the
* fast convolution method via an FFT. The decimation factor is an
* integer that is greater than or equal to 1.
*
* The filter takes a set of real-valued taps to use in the
* filtering operation. These taps can be defined as anything that
* satisfies the user's filtering needs. For standard filters such
* as lowpass, highpass, bandpass, etc., the filter.firdes and
* filter.optfir classes provide convenient generating methods.
*
* This filter is implemented by using the FFTW package to perform
* the required FFTs. An optional argument, nthreads, may be
* passed to the constructor (or set using the set_nthreads member
* function) to split the FFT among N number of threads. This can
* improve performance on very large FFTs (that is, if the number
* of taps used is very large) if you have enough threads/cores to
* support it.
*/
class FILTER_API fft_filter_fff : virtual public sync_decimator
{
public:
// gr::filter::fft_filter_fff::sptr
typedef boost::shared_ptr<fft_filter_fff> sptr;
/*!
* Build an FFT filter block.
*
* \param decimation >= 1
* \param taps float filter taps
* \param nthreads number of threads for the FFT to use
*/
static sptr make(int decimation, const std::vector<float>& taps, int nthreads = 1);
virtual void set_taps(const std::vector<float>& taps) = 0;
virtual std::vector<float> taps() const = 0;
/*!
* \brief Set number of threads to use.
*/
virtual void set_nthreads(int n) = 0;
/*!
* \brief Get number of threads being used.
*/
virtual int nthreads() const = 0;
};
} /* namespace filter */
} /* namespace gr */
#endif /* INCLUDED_FILTER_FFT_FILTER_FFF_H */
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