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 <span id="projectnumber">$Id:Doxyfile42802007-03-2104:39:00Znenolod$</span>
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<div class="title">fft.c File Reference</div> </div>
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<div class="textblock"><code>#include <complex.h></code><br/>
<code>#include <math.h></code><br/>
<code>#include "config.h"</code><br/>
<code>#include "<a class="el" href="fft_8h_source.html">fft.h</a>"</code><br/>
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<p><a href="fft_8c_source.html">Go to the source code of this file.</a></p>
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Macros</h2></td></tr>
<tr class="memitem:a1ab7874eb8ed0d1c79247418e1070b0e"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8c.html#a1ab7874eb8ed0d1c79247418e1070b0e">cexpf</a>(x)   (expf(crealf(x))*(cosf(cimagf(x))+sinf(cimagf(x))*I))</td></tr>
<tr class="separator:a1ab7874eb8ed0d1c79247418e1070b0e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a0240ac851181b84ac374872dc5434ee4"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>   512 /* size of the DFT */</td></tr>
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<tr class="memitem:aa7c39f30636a35aaebd2dcdc04d9d8fd"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8c.html#aa7c39f30636a35aaebd2dcdc04d9d8fd">LOGN</a>   9 /* log <a class="el" href="fft_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a> (base 2) */</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ad47c89b9bac840a5630b5b8fe08c6143"><td class="memItemLeft" align="right" valign="top">static <a class="el" href="plugins-api_8h.html#a61569f2965b7a369eb10b6d75d410d11">int</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8c.html#ad47c89b9bac840a5630b5b8fe08c6143">bit_reverse</a> (<a class="el" href="plugins-api_8h.html#a61569f2965b7a369eb10b6d75d410d11">int</a> x)</td></tr>
<tr class="separator:ad47c89b9bac840a5630b5b8fe08c6143"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a835377a1e34fa176f159662509eee0f9"><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8c.html#a835377a1e34fa176f159662509eee0f9">generate_tables</a> (void)</td></tr>
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<tr class="memitem:a540811109d5854f25cb7a6bfa5b4ef05"><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8c.html#a540811109d5854f25cb7a6bfa5b4ef05">do_fft</a> (float complex <a class="el" href="equalizer_8c.html#a64c71ff5789a589bf5d6eaf94c674b9e">a</a>[<a class="el" href="fft_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>])</td></tr>
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<tr class="memitem:a386580f06b7366632abb3d1291105a77"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8c.html#a386580f06b7366632abb3d1291105a77">calc_freq</a> (const float data[<a class="el" href="fft_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>], float freq[<a class="el" href="fft_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>/2])</td></tr>
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Variables</h2></td></tr>
<tr class="memitem:a59cabfa544083174008515e2184edcf9"><td class="memItemLeft" align="right" valign="top">static float </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8c.html#a59cabfa544083174008515e2184edcf9">hamming</a> [<a class="el" href="fft_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>]</td></tr>
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<tr class="memitem:a853b868a1813ec9da4294c8b6611486c"><td class="memItemLeft" align="right" valign="top">static <a class="el" href="plugins-api_8h.html#a61569f2965b7a369eb10b6d75d410d11">int</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8c.html#a853b868a1813ec9da4294c8b6611486c">reversed</a> [<a class="el" href="fft_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>]</td></tr>
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<tr class="memitem:a93d4511c4b987309a7362b3fcf123f87"><td class="memItemLeft" align="right" valign="top">static float complex </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8c.html#a93d4511c4b987309a7362b3fcf123f87">roots</a> [<a class="el" href="fft_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>/2]</td></tr>
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<tr class="memitem:ac914e4aa9d88d2183f11b8aaea35599c"><td class="memItemLeft" align="right" valign="top">static char </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8c.html#ac914e4aa9d88d2183f11b8aaea35599c">generated</a> = 0</td></tr>
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<h2 class="groupheader">Macro Definition Documentation</h2>
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<td class="memname">#define cexpf</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">x</td><td>)</td>
<td>   (expf(crealf(x))*(cosf(cimagf(x))+sinf(cimagf(x))*I))</td>
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<p>Definition at line <a class="el" href="fft_8c_source.html#l00028">28</a> of file <a class="el" href="fft_8c_source.html">fft.c</a>.</p>
<p>Referenced by <a class="el" href="fft_8c_source.html#l00057">generate_tables()</a>.</p>
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<td class="memname">#define LOGN   9 /* log <a class="el" href="fft_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a> (base 2) */</td>
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<p>Definition at line <a class="el" href="fft_8c_source.html#l00033">33</a> of file <a class="el" href="fft_8c_source.html">fft.c</a>.</p>
<p>Referenced by <a class="el" href="fft_8c_source.html#l00042">bit_reverse()</a>.</p>
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<td class="memname">#define N   512 /* size of the DFT */</td>
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<p>Definition at line <a class="el" href="fft_8c_source.html#l00032">32</a> of file <a class="el" href="fft_8c_source.html">fft.c</a>.</p>
<p>Referenced by <a class="el" href="fft_8c_source.html#l00106">calc_freq()</a>, <a class="el" href="fft_8c_source.html#l00077">do_fft()</a>, and <a class="el" href="fft_8c_source.html#l00057">generate_tables()</a>.</p>
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<h2 class="groupheader">Function Documentation</h2>
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<td class="memname">static <a class="el" href="plugins-api_8h.html#a61569f2965b7a369eb10b6d75d410d11">int</a> bit_reverse </td>
<td>(</td>
<td class="paramtype"><a class="el" href="plugins-api_8h.html#a61569f2965b7a369eb10b6d75d410d11">int</a> </td>
<td class="paramname"><em>x</em></td><td>)</td>
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<p>Definition at line <a class="el" href="fft_8c_source.html#l00042">42</a> of file <a class="el" href="fft_8c_source.html">fft.c</a>.</p>
<p>Referenced by <a class="el" href="fft_8c_source.html#l00057">generate_tables()</a>.</p>
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<td class="memname">void calc_freq </td>
<td>(</td>
<td class="paramtype">const float </td>
<td class="paramname"><em>data</em>[N], </td>
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<td class="paramtype">float </td>
<td class="paramname"><em>freq</em>[N/2] </td>
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<td>)</td>
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<p>Definition at line <a class="el" href="fft_8c_source.html#l00106">106</a> of file <a class="el" href="fft_8c_source.html">fft.c</a>.</p>
<p>Referenced by <a class="el" href="visualization_8c_source.html#l00092">vis_send_audio()</a>.</p>
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<td class="memname">static void do_fft </td>
<td>(</td>
<td class="paramtype">float complex </td>
<td class="paramname"><em>a</em>[N]</td><td>)</td>
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<p>Definition at line <a class="el" href="fft_8c_source.html#l00077">77</a> of file <a class="el" href="fft_8c_source.html">fft.c</a>.</p>
<p>Referenced by <a class="el" href="fft_8c_source.html#l00106">calc_freq()</a>.</p>
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<td class="memname">static void generate_tables </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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<p>Definition at line <a class="el" href="fft_8c_source.html#l00057">57</a> of file <a class="el" href="fft_8c_source.html">fft.c</a>.</p>
<p>Referenced by <a class="el" href="fft_8c_source.html#l00106">calc_freq()</a>.</p>
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<h2 class="groupheader">Variable Documentation</h2>
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<td class="memname">char generated = 0</td>
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<p>Definition at line <a class="el" href="fft_8c_source.html#l00038">38</a> of file <a class="el" href="fft_8c_source.html">fft.c</a>.</p>
<p>Referenced by <a class="el" href="fft_8c_source.html#l00057">generate_tables()</a>.</p>
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<td class="memname">float hamming[<a class="el" href="fft_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>]</td>
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<p>Definition at line <a class="el" href="fft_8c_source.html#l00035">35</a> of file <a class="el" href="fft_8c_source.html">fft.c</a>.</p>
<p>Referenced by <a class="el" href="fft_8c_source.html#l00106">calc_freq()</a>, and <a class="el" href="fft_8c_source.html#l00057">generate_tables()</a>.</p>
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<td class="memname"><a class="el" href="plugins-api_8h.html#a61569f2965b7a369eb10b6d75d410d11">int</a> reversed[<a class="el" href="fft_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>]</td>
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<p>Definition at line <a class="el" href="fft_8c_source.html#l00036">36</a> of file <a class="el" href="fft_8c_source.html">fft.c</a>.</p>
<p>Referenced by <a class="el" href="fft_8c_source.html#l00106">calc_freq()</a>, <a class="el" href="fft_8c_source.html#l00057">generate_tables()</a>, and <a class="el" href="playlist-new_8c_source.html#l01523">playlist_reverse()</a>.</p>
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<td class="memname">float complex roots[<a class="el" href="fft_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>/2]</td>
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<p>Definition at line <a class="el" href="fft_8c_source.html#l00037">37</a> of file <a class="el" href="fft_8c_source.html">fft.c</a>.</p>
<p>Referenced by <a class="el" href="fft_8c_source.html#l00077">do_fft()</a>, and <a class="el" href="fft_8c_source.html#l00057">generate_tables()</a>.</p>
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