GNU Radio 2.x: gri_fft.h Source File

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# gri_fft.h

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    00001 /* -*- c++ -*- */
    00002 /*
    00003  * Copyright 2003 Free Software Foundation, Inc.
    00004  *
    00005  * This file is part of GNU Radio
    00006  *
    00007  * GNU Radio is free software; you can redistribute it and/or modify
    00008  * it under the terms of the GNU General Public License as published by
    00009  * the Free Software Foundation; either version 2, or (at your option)
    00010  * any later version.
    00011  *
    00012  * GNU Radio is distributed in the hope that it will be useful,
    00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00015  * GNU General Public License for more details.
    00016  *
    00017  * You should have received a copy of the GNU General Public License
    00018  * along with GNU Radio; see the file COPYING.  If not, write to
    00019  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    00020  * Boston, MA 02111-1307, USA.
    00021  */
    00022 #ifndef _GRI_FFT_H_
    00023 #define _GRI_FFT_H_
    00024
    00025 /*
    00026  * Wrappers for FFTW single precision 1d dft
    00027  */
    00028
    00029 #include <gr_complex.h>
    00030
    00035 class gri_fft_complex {
    00036   int         d_fft_size;
    00037   gr_complex *d_inbuf;
    00038   gr_complex *d_outbuf;
    00039   void       *d_plan;
    00040
    00041 public:
    00042   gri_fft_complex (int fft_size, bool forward = true);
    00043   virtual ~gri_fft_complex ();
    00044
    00045   /*
    00046    * These return pointers to buffers owned by gri_fft_complex into which
    00047    * input and output take place.  It's done this way in order to
    00048    * ensure optimal alignment for SIMD instructions.
    00049    */
    00050   gr_complex *get_inbuf ()  const { return d_inbuf; }
    00051   gr_complex *get_outbuf () const { return d_outbuf; }
    00052
    00053   int inbuf_length ()  const { return d_fft_size; }
    00054   int outbuf_length () const { return d_fft_size; }
    00055
    00059   void execute ();
    00060 };
    00061
    00065 class gri_fft_real_fwd {
    00066   int         d_fft_size;
    00067   float      *d_inbuf;
    00068   gr_complex *d_outbuf;
    00069   void       *d_plan;
    00070
    00071 public:
    00072   gri_fft_real_fwd (int fft_size);
    00073   virtual ~gri_fft_real_fwd ();
    00074
    00075   /*
    00076    * These return pointers to buffers owned by gri_fft_real_fwd into
    00077    * which input and output take place.  It's done this way in order
    00078    * to ensure optimal alignment for SIMD instructions.
    00079    */
    00080   float *get_inbuf ()      const { return d_inbuf; }
    00081   gr_complex *get_outbuf () const { return d_outbuf; }
    00082
    00083   int inbuf_length ()  const { return d_fft_size; }
    00084   int outbuf_length () const { return d_fft_size / 2 + 1; }
    00085
    00089   void execute ();
    00090 };
    00091
    00095 class gri_fft_real_rev {
    00096   int         d_fft_size;
    00097   gr_complex *d_inbuf;
    00098   float      *d_outbuf;
    00099   void       *d_plan;
    00100
    00101 public:
    00102   gri_fft_real_rev (int fft_size);
    00103   virtual ~gri_fft_real_rev ();
    00104
    00105   /*
    00106    * These return pointers to buffers owned by gri_fft_real_rev into
    00107    * which input and output take place.  It's done this way in order
    00108    * to ensure optimal alignment for SIMD instructions.
    00109    */
    00110   gr_complex *get_inbuf () const { return d_inbuf; }
    00111   float *get_outbuf () const { return d_outbuf; }
    00112
    00113   int inbuf_length ()  const { return d_fft_size / 2 + 1; }
    00114   int outbuf_length () const { return d_fft_size; }
    00115
    00119   void execute ();
    00120 };
    00121
    00122 #endif