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/* -*- c++ -*- */
/*
* Copyright 2003,2008,2012 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef _FFT_FFT_H_
#define _FFT_FFT_H_
/*
* Wrappers for FFTW single precision 1d dft
*/
#include <fft/api.h>
#include <gr_complex.h>
#include <boost/thread.hpp>
namespace gr {
namespace fft {
/*! \brief Helper function for allocating complex fft buffers
*/
gr_complex* malloc_complex(int size);
/*! \brief Helper function for allocating float fft buffers
*/
float* malloc_float(int size);
/*! \brief Helper function for freeing fft buffers
*/
void free(void *b);
/*!
* \brief Export reference to planner mutex for those apps that
* want to use FFTW w/o using the fft_impl_fftw* classes.
*/
class FFT_API planner {
public:
typedef boost::mutex::scoped_lock scoped_lock;
/*!
* Return reference to planner mutex
*/
static boost::mutex &mutex();
};
/*!
* \brief FFT: complex in, complex out
* \ingroup misc
*/
class FFT_API fft_complex {
int d_fft_size;
int d_nthreads;
gr_complex *d_inbuf;
gr_complex *d_outbuf;
void *d_plan;
public:
fft_complex(int fft_size, bool forward = true, int nthreads=1);
virtual ~fft_complex();
/*
* These return pointers to buffers owned by fft_impl_fft_complex
* into which input and output take place. It's done this way in
* order to ensure optimal alignment for SIMD instructions.
*/
gr_complex *get_inbuf() const { return d_inbuf; }
gr_complex *get_outbuf() const { return d_outbuf; }
int inbuf_length() const { return d_fft_size; }
int outbuf_length() const { return d_fft_size; }
/*!
* Set the number of threads to use for caclulation.
*/
void set_nthreads(int n);
/*!
* Get the number of threads being used by FFTW
*/
int nthreads() const { return d_nthreads; }
/*!
* compute FFT. The input comes from inbuf, the output is placed in
* outbuf.
*/
void execute();
};
/*!
* \brief FFT: real in, complex out
* \ingroup misc
*/
class FFT_API fft_real_fwd {
int d_fft_size;
int d_nthreads;
float *d_inbuf;
gr_complex *d_outbuf;
void *d_plan;
public:
fft_real_fwd (int fft_size, int nthreads=1);
virtual ~fft_real_fwd ();
/*
* These return pointers to buffers owned by fft_impl_fft_real_fwd
* into which input and output take place. It's done this way in
* order to ensure optimal alignment for SIMD instructions.
*/
float *get_inbuf() const { return d_inbuf; }
gr_complex *get_outbuf() const { return d_outbuf; }
int inbuf_length() const { return d_fft_size; }
int outbuf_length() const { return d_fft_size / 2 + 1; }
/*!
* Set the number of threads to use for caclulation.
*/
void set_nthreads(int n);
/*!
* Get the number of threads being used by FFTW
*/
int nthreads() const { return d_nthreads; }
/*!
* compute FFT. The input comes from inbuf, the output is placed in
* outbuf.
*/
void execute();
};
/*!
* \brief FFT: complex in, float out
* \ingroup misc
*/
class FFT_API fft_real_rev {
int d_fft_size;
int d_nthreads;
gr_complex *d_inbuf;
float *d_outbuf;
void *d_plan;
public:
fft_real_rev(int fft_size, int nthreads=1);
virtual ~fft_real_rev();
/*
* These return pointers to buffers owned by fft_impl_fft_real_rev
* into which input and output take place. It's done this way in
* order to ensure optimal alignment for SIMD instructions.
*/
gr_complex *get_inbuf() const { return d_inbuf; }
float *get_outbuf() const { return d_outbuf; }
int inbuf_length() const { return d_fft_size / 2 + 1; }
int outbuf_length() const { return d_fft_size; }
/*!
* Set the number of threads to use for caclulation.
*/
void set_nthreads(int n);
/*!
* Get the number of threads being used by FFTW
*/
int nthreads() const { return d_nthreads; }
/*!
* compute FFT. The input comes from inbuf, the output is placed in
* outbuf.
*/
void execute();
};
} /* namespace fft */
} /*namespace gr */
#endif /* _FFT_FFT_H_ */
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