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Update for 2.4
author Chris Cannam
date Fri, 13 Jul 2012 13:30:27 +0100
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   &#160;<span id="projectnumber">2.4</span>
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<div class="title">Vamp::FFT Class Reference</div>  </div>
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<p>A simple <a class="el" href="classVamp_1_1FFT.html" title="A simple FFT implementation provided for convenience of plugin authors.">FFT</a> implementation provided for convenience of plugin authors.  
 <a href="classVamp_1_1FFT.html#details">More...</a></p>

<p><code>#include &lt;<a class="el" href="FFT_8h_source.html">FFT.h</a>&gt;</code></p>

<p><a href="classVamp_1_1FFT-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-static-methods"></a>
Static Public Member Functions</h2></td></tr>
<tr class="memitem:a219e3f6f0392dbdacad4a47d912f9aca"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classVamp_1_1FFT.html#a219e3f6f0392dbdacad4a47d912f9aca">forward</a> (unsigned int n, const double *ri, const double *ii, double *ro, double *io)</td></tr>
<tr class="memdesc:a219e3f6f0392dbdacad4a47d912f9aca"><td class="mdescLeft">&#160;</td><td class="mdescRight">Calculate a forward transform of size n.  <a href="#a219e3f6f0392dbdacad4a47d912f9aca"></a><br/></td></tr>
<tr class="memitem:aff98a3610275024cd3cb421e6283ee7f"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classVamp_1_1FFT.html#aff98a3610275024cd3cb421e6283ee7f">inverse</a> (unsigned int n, const double *ri, const double *ii, double *ro, double *io)</td></tr>
<tr class="memdesc:aff98a3610275024cd3cb421e6283ee7f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Calculate an inverse transform of size n.  <a href="#aff98a3610275024cd3cb421e6283ee7f"></a><br/></td></tr>
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<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>A simple <a class="el" href="classVamp_1_1FFT.html" title="A simple FFT implementation provided for convenience of plugin authors.">FFT</a> implementation provided for convenience of plugin authors. </p>
<p>This class provides double-precision FFTs in power-of-two sizes only. It is slower than more sophisticated library implementations. If these requirements aren't suitable, make other arrangements.</p>
<p>The inverse transform is scaled by 1/n.</p>
<p>The implementation is from Don Cross's public domain <a class="el" href="classVamp_1_1FFT.html" title="A simple FFT implementation provided for convenience of plugin authors.">FFT</a> code. </p>

<p>Definition at line <a class="el" href="FFT_8h_source.html#l00058">58</a> of file <a class="el" href="FFT_8h_source.html">FFT.h</a>.</p>
</div><hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a219e3f6f0392dbdacad4a47d912f9aca"></a>
<div class="memitem">
<div class="memproto">
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          <td class="memname">static void <a class="el" href="classVamp_1_1FFT.html#a219e3f6f0392dbdacad4a47d912f9aca">Vamp::FFT::forward</a> </td>
          <td>(</td>
          <td class="paramtype">unsigned int&#160;</td>
          <td class="paramname"><em>n</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const double *&#160;</td>
          <td class="paramname"><em>ri</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const double *&#160;</td>
          <td class="paramname"><em>ii</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">double *&#160;</td>
          <td class="paramname"><em>ro</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">double *&#160;</td>
          <td class="paramname"><em>io</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td><code> [static]</code></td>
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<p>Calculate a forward transform of size n. </p>
<p>ri and ii must point to the real and imaginary component arrays of the input. For real input, ii may be NULL.</p>
<p>ro and io must point to enough space to receive the real and imaginary component arrays of the output.</p>
<p>All input and output arrays are of size n. </p>

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<a class="anchor" id="aff98a3610275024cd3cb421e6283ee7f"></a>
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          <td class="memname">static void <a class="el" href="classVamp_1_1FFT.html#aff98a3610275024cd3cb421e6283ee7f">Vamp::FFT::inverse</a> </td>
          <td>(</td>
          <td class="paramtype">unsigned int&#160;</td>
          <td class="paramname"><em>n</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const double *&#160;</td>
          <td class="paramname"><em>ri</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const double *&#160;</td>
          <td class="paramname"><em>ii</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">double *&#160;</td>
          <td class="paramname"><em>ro</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">double *&#160;</td>
          <td class="paramname"><em>io</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td><code> [static]</code></td>
        </tr>
      </table>
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<div class="memdoc">

<p>Calculate an inverse transform of size n. </p>
<p>ri and ii must point to the real and imaginary component arrays of the input. For real input, ii may be NULL.</p>
<p>ro and io must point to enough space to receive the real and imaginary component arrays of the output. The output is scaled by 1/n. The output pointers may not be NULL, even if the output is expected to be real.</p>
<p>All input and output arrays are of size n. </p>

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<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="FFT_8h_source.html">FFT.h</a></li>
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