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<h1 class="title">FFTReal.h Example File</h1>
<span class="subtitle">multimedia/spectrum/3rdparty/fftreal/FFTReal.h</span>
<!-- $$$multimedia/spectrum/3rdparty/fftreal/FFTReal.h-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/*****************************************************************************

          FFTReal.h
          Copyright (c) 2005 Laurent de Soras

  --- Legal stuff ---

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  *Tab=3***********************************************************************/</span>

  <span class="preprocessor">#if ! defined (FFTReal_HEADER_INCLUDED)</span>
  <span class="preprocessor">#define FFTReal_HEADER_INCLUDED</span>

  <span class="preprocessor">#if defined (_MSC_VER)</span>
          <span class="preprocessor">#pragma once</span>
          <span class="preprocessor">#pragma warning (4 : 4250) // &quot;Inherits via dominance.&quot;</span>
  <span class="preprocessor">#endif</span>

  <span class="comment">/*\\\ INCLUDE FILES \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/</span>

  <span class="preprocessor">#include        &quot;def.h&quot;</span>
  <span class="preprocessor">#include        &quot;DynArray.h&quot;</span>
  <span class="preprocessor">#include        &quot;OscSinCos.h&quot;</span>

  <span class="keyword">template</span> <span class="operator">&lt;</span><span class="keyword">class</span> DT<span class="operator">&gt;</span>
  <span class="keyword">class</span> FFTReal
  {

  <span class="comment">/*\\\ PUBLIC \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/</span>

  <span class="keyword">public</span>:

          <span class="keyword">enum</span> {                  MAX_BIT_DEPTH   <span class="operator">=</span> <span class="number">30</span>    };      <span class="comment">// So length can be represented as long int</span>

          <span class="keyword">typedef</span> DT      DataType;

          <span class="keyword">explicit</span>                        FFTReal (<span class="type">long</span> length);
          <span class="keyword">virtual</span>                 <span class="operator">~</span>FFTReal () {}

          <span class="type">long</span>                            get_length () <span class="keyword">const</span>;
          <span class="type">void</span>                            do_fft (DataType f <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="keyword">const</span> DataType x <span class="operator">[</span><span class="operator">]</span>) <span class="keyword">const</span>;
          <span class="type">void</span>                            do_ifft (<span class="keyword">const</span> DataType f <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> DataType x <span class="operator">[</span><span class="operator">]</span>) <span class="keyword">const</span>;
          <span class="type">void</span>                            rescale (DataType x <span class="operator">[</span><span class="operator">]</span>) <span class="keyword">const</span>;
          DataType <span class="operator">*</span>              use_buffer () <span class="keyword">const</span>;

  <span class="comment">/*\\\ PROTECTED \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/</span>

  <span class="keyword">protected</span>:

  <span class="comment">/*\\\ PRIVATE \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/</span>

  <span class="keyword">private</span>:

     <span class="comment">// Over this bit depth, we use direct calculation for sin/cos</span>
     <span class="keyword">enum</span> {             TRIGO_BD_LIMIT    <span class="operator">=</span> <span class="number">12</span>  };

          <span class="keyword">typedef</span> OscSinCos <span class="operator">&lt;</span>DataType<span class="operator">&gt;</span>    OscType;

          <span class="type">void</span>                            init_br_lut ();
          <span class="type">void</span>                            init_trigo_lut ();
          <span class="type">void</span>                            init_trigo_osc ();

          FORCEINLINE <span class="keyword">const</span> <span class="type">long</span> <span class="operator">*</span>
                                                  get_br_ptr () <span class="keyword">const</span>;
          FORCEINLINE <span class="keyword">const</span> DataType      <span class="operator">*</span>
                                                  get_trigo_ptr (<span class="type">int</span> level) <span class="keyword">const</span>;
          FORCEINLINE <span class="type">long</span>
                                                  get_trigo_level_index (<span class="type">int</span> level) <span class="keyword">const</span>;

          <span class="keyword">inline</span> <span class="type">void</span>             compute_fft_general (DataType f <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="keyword">const</span> DataType x <span class="operator">[</span><span class="operator">]</span>) <span class="keyword">const</span>;
          <span class="keyword">inline</span> <span class="type">void</span>             compute_direct_pass_1_2 (DataType df <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="keyword">const</span> DataType x <span class="operator">[</span><span class="operator">]</span>) <span class="keyword">const</span>;
          <span class="keyword">inline</span> <span class="type">void</span>             compute_direct_pass_3 (DataType df <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="keyword">const</span> DataType sf <span class="operator">[</span><span class="operator">]</span>) <span class="keyword">const</span>;
          <span class="keyword">inline</span> <span class="type">void</span>             compute_direct_pass_n (DataType df <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="keyword">const</span> DataType sf <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="type">int</span> pass) <span class="keyword">const</span>;
          <span class="keyword">inline</span> <span class="type">void</span>             compute_direct_pass_n_lut (DataType df <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="keyword">const</span> DataType sf <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="type">int</span> pass) <span class="keyword">const</span>;
          <span class="keyword">inline</span> <span class="type">void</span>             compute_direct_pass_n_osc (DataType df <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="keyword">const</span> DataType sf <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="type">int</span> pass) <span class="keyword">const</span>;

          <span class="keyword">inline</span> <span class="type">void</span>             compute_ifft_general (<span class="keyword">const</span> DataType f <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> DataType x <span class="operator">[</span><span class="operator">]</span>) <span class="keyword">const</span>;
          <span class="keyword">inline</span> <span class="type">void</span>             compute_inverse_pass_n (DataType df <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="keyword">const</span> DataType sf <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="type">int</span> pass) <span class="keyword">const</span>;
          <span class="keyword">inline</span> <span class="type">void</span>             compute_inverse_pass_n_osc (DataType df <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="keyword">const</span> DataType sf <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="type">int</span> pass) <span class="keyword">const</span>;
          <span class="keyword">inline</span> <span class="type">void</span>             compute_inverse_pass_n_lut (DataType df <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="keyword">const</span> DataType sf <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="type">int</span> pass) <span class="keyword">const</span>;
          <span class="keyword">inline</span> <span class="type">void</span>             compute_inverse_pass_3 (DataType df <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="keyword">const</span> DataType sf <span class="operator">[</span><span class="operator">]</span>) <span class="keyword">const</span>;
          <span class="keyword">inline</span> <span class="type">void</span>             compute_inverse_pass_1_2 (DataType x <span class="operator">[</span><span class="operator">]</span><span class="operator">,</span> <span class="keyword">const</span> DataType sf <span class="operator">[</span><span class="operator">]</span>) <span class="keyword">const</span>;

          <span class="keyword">const</span> <span class="type">long</span>              _length;
          <span class="keyword">const</span> <span class="type">int</span>               _nbr_bits;
          DynArray <span class="operator">&lt;</span><span class="type">long</span><span class="operator">&gt;</span>
                                                  _br_lut;
          DynArray <span class="operator">&lt;</span>DataType<span class="operator">&gt;</span>
                                                  _trigo_lut;
          <span class="keyword">mutable</span> DynArray <span class="operator">&lt;</span>DataType<span class="operator">&gt;</span>
                                                  _buffer;
     <span class="keyword">mutable</span> DynArray <span class="operator">&lt;</span>OscType<span class="operator">&gt;</span>
                                                  _trigo_osc;

  <span class="comment">/*\\\ FORBIDDEN MEMBER FUNCTIONS \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/</span>

  <span class="keyword">private</span>:

                                                  FFTReal ();
                                                  FFTReal (<span class="keyword">const</span> FFTReal <span class="operator">&amp;</span>other);
          FFTReal <span class="operator">&amp;</span>               <span class="keyword">operator</span> <span class="operator">=</span> (<span class="keyword">const</span> FFTReal <span class="operator">&amp;</span>other);
          bool                            <span class="keyword">operator</span> <span class="operator">=</span><span class="operator">=</span> (<span class="keyword">const</span> FFTReal <span class="operator">&amp;</span>other);
          bool                            <span class="keyword">operator</span> <span class="operator">!</span><span class="operator">=</span> (<span class="keyword">const</span> FFTReal <span class="operator">&amp;</span>other);

  };      <span class="comment">// class FFTReal</span>

  <span class="preprocessor">#include        &quot;FFTReal.hpp&quot;</span>

  <span class="preprocessor">#endif  // FFTReal_HEADER_INCLUDED</span>

  <span class="comment">/*\\\ EOF \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/</span>

</pre>
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<!-- @@@multimedia/spectrum/3rdparty/fftreal/FFTReal.h -->
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