Houston, we have a trunk.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@3122 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 122 insertions, 0 deletions

diff --git a/gnuradio-core/src/lib/general/gri_fft.h b/gnuradio-core/src/lib/general/gri_fft.h
new file mode 100644
index 000000000..503477484
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gri_fft.h
@@ -0,0 +1,122 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2003 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 2, 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+#ifndef _GRI_FFT_H_
+#define _GRI_FFT_H_
+
+/*
+ * Wrappers for FFTW single precision 1d dft
+ */
+
+#include <gr_complex.h>
+
+/*!
+ * \brief FFT: complex in, complex out
+ */
+
+class gri_fft_complex {
+  int	      d_fft_size;
+  gr_complex *d_inbuf;
+  gr_complex *d_outbuf;
+  void	     *d_plan;
+  
+public:
+  gri_fft_complex (int fft_size, bool forward = true);
+  virtual ~gri_fft_complex ();
+
+  /*
+   * These return pointers to buffers owned by gri_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; }
+
+  /*!
+   * compute FFT.  The input comes from inbuf, the output is placed in outbuf.
+   */
+  void execute ();
+};
+
+/*!
+ * \brief FFT: real in, complex out
+ */
+class gri_fft_real_fwd {
+  int	      d_fft_size;
+  float	     *d_inbuf;
+  gr_complex *d_outbuf;
+  void	     *d_plan;
+  
+public:
+  gri_fft_real_fwd (int fft_size);
+  virtual ~gri_fft_real_fwd ();
+
+  /*
+   * These return pointers to buffers owned by gri_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; }
+
+  /*!
+   * compute FFT.  The input comes from inbuf, the output is placed in outbuf.
+   */
+  void execute ();
+};
+
+/*!
+ * \brief FFT: complex in, float out
+ */
+class gri_fft_real_rev {
+  int	      d_fft_size;
+  gr_complex *d_inbuf;
+  float	     *d_outbuf;
+  void	     *d_plan;
+  
+public:
+  gri_fft_real_rev (int fft_size);
+  virtual ~gri_fft_real_rev ();
+
+  /*
+   * These return pointers to buffers owned by gri_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; }
+
+  /*!
+   * compute FFT.  The input comes from inbuf, the output is placed in outbuf.
+   */
+  void execute ();
+};
+
+#endif