GNU Radio 3.6.4 C++ API
gri_fft_filter_fff_generic.h
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/* -*- c++ -*- */
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/*
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* Copyright 2010 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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* GNU Radio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* GNU Radio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Radio; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef INCLUDED_GRI_FFT_FILTER_FFF_GENERIC_H
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#define INCLUDED_GRI_FFT_FILTER_FFF_GENERIC_H
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#include <
gr_core_api.h
>
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#include <
gr_complex.h
>
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#include <vector>
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class
gri_fft_real_fwd
;
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class
gri_fft_real_rev
;
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class
GR_CORE_API
gri_fft_filter_fff_generic
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{
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private
:
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int
d_ntaps;
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int
d_nsamples;
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int
d_fftsize;
// fftsize = ntaps + nsamples - 1
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int
d_decimation;
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gri_fft_real_fwd
*d_fwdfft;
// forward "plan"
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gri_fft_real_rev
*d_invfft;
// inverse "plan"
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int
d_nthreads;
// number of FFTW threads to use
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std::vector<float> d_tail;
// state carried between blocks for overlap-add
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std::vector<float> d_new_taps;
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gr_complex
*d_xformed_taps;
// Fourier xformed taps
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void
compute_sizes(
int
ntaps);
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int
tailsize()
const
{
return
d_ntaps - 1; }
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public
:
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/*!
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* \brief Construct a FFT filter for float vectors with the given taps and decimation rate.
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*
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* This is the basic implementation for performing FFT filter for fast convolution
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* in other blocks for floating point vectors (such as gr_fft_filter_fff).
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* \param decimation The decimation rate of the filter (int)
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* \param taps The filter taps (float)
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* \param nthreads The number of threads for the FFT to use (int)
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*/
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gri_fft_filter_fff_generic
(
int
decimation,
const
std::vector<float> &
taps
,
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int
nthreads=1);
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~
gri_fft_filter_fff_generic
();
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/*!
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* \brief Set new taps for the filter.
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*
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* Sets new taps and resets the class properties to handle different sizes
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* \param taps The filter taps (float)
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*/
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int
set_taps (
const
std::vector<float> &taps);
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/*!
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* \brief Set number of threads to use.
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*/
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void
set_nthreads(
int
n);
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/*!
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* \brief Get number of threads being used.
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*/
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int
nthreads()
const
;
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/*!
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* \brief Perform the filter operation
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*
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* \param nitems The number of items to produce
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* \param input The input vector to be filtered
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* \param output The result of the filter operation
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*/
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int
filter (
int
nitems,
const
float
*input,
float
*output);
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};
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#endif
/* INCLUDED_GRI_FFT_FILTER_FFF_GENERIC_H */
gnuradio
gnuradio-core
src
lib
filter
gri_fft_filter_fff_generic.h
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