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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) // "Inherits via dominance."</span>
<span class="preprocessor">#endif</span>
<span class="comment">/*\\\ INCLUDE FILES \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/</span>
<span class="preprocessor">#include "def.h"</span>
<span class="preprocessor">#include "DynArray.h"</span>
<span class="preprocessor">#include "OscSinCos.h"</span>
<span class="keyword">template</span> <span class="operator"><</span><span class="keyword">class</span> DT<span class="operator">></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"><</span>DataType<span class="operator">></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"><</span><span class="type">long</span><span class="operator">></span>
_br_lut;
DynArray <span class="operator"><</span>DataType<span class="operator">></span>
_trigo_lut;
<span class="keyword">mutable</span> DynArray <span class="operator"><</span>DataType<span class="operator">></span>
_buffer;
<span class="keyword">mutable</span> DynArray <span class="operator"><</span>OscType<span class="operator">></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">&</span>other);
FFTReal <span class="operator">&</span> <span class="keyword">operator</span> <span class="operator">=</span> (<span class="keyword">const</span> FFTReal <span class="operator">&</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">&</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">&</span>other);
}; <span class="comment">// class FFTReal</span>
<span class="preprocessor">#include "FFTReal.hpp"</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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