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 <span id="projectnumber">2.0</span>
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<div class="title">paex_ocean_shore.c File Reference<div class="ingroups"><a class="el" href="group__examples__src.html">Example programs demonstrating PortAudio usage</a></div></div> </div>
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<p>Generate Pink Noise using Gardner method, and make "waves". Provides an example of how to post stuff to/from the audio callback using lock-free FIFOs implemented by the PA ringbuffer.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include <stdio.h></code><br/>
<code>#include <stdlib.h></code><br/>
<code>#include <string.h></code><br/>
<code>#include <math.h></code><br/>
<code>#include <time.h></code><br/>
<code>#include "<a class="el" href="portaudio_8h_source.html">portaudio.h</a>"</code><br/>
<code>#include "pa_ringbuffer.h"</code><br/>
<code>#include "pa_util.h"</code><br/>
</div>
<p><a href="paex__ocean__shore_8c_source.html">Go to the source code of this file.</a></p>
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Data Structures</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structPinkNoise.html">PinkNoise</a></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structBiQuad.html">BiQuad</a></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structOceanWave.html">OceanWave</a></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structpaTestData.html">paTestData</a></td></tr>
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#define </td><td class="memItemRight" valign="bottom"><b>PINK_MAX_RANDOM_ROWS</b>   (30)</td></tr>
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<tr class="memitem:a543ce37e1e5c7fde4ec39c832136683c"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a543ce37e1e5c7fde4ec39c832136683c"></a>
#define </td><td class="memItemRight" valign="bottom"><b>PINK_RANDOM_BITS</b>   (24)</td></tr>
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#define </td><td class="memItemRight" valign="bottom"><b>PINK_RANDOM_SHIFT</b>   ((sizeof(long)*8)-PINK_RANDOM_BITS)</td></tr>
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#define </td><td class="memItemRight" valign="bottom"><b>NEW_ROW_SIZE</b>   (12 + (8*rand())/RAND_MAX)</td></tr>
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Enumerations</h2></td></tr>
<tr class="memitem:a6ef105f364067626d9f25c5589aaff2e"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><b>EnvState</b> { <b>State_kAttack</b>,
<b>State_kPreDecay</b>,
<b>State_kDecay</b>,
<b>State_kCnt</b>
}</td></tr>
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void </td><td class="memItemRight" valign="bottom"><b>InitializePinkNoise</b> (<a class="el" href="structPinkNoise.html">PinkNoise</a> *pink, int numRows)</td></tr>
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float </td><td class="memItemRight" valign="bottom"><b>GeneratePinkNoise</b> (<a class="el" href="structPinkNoise.html">PinkNoise</a> *pink)</td></tr>
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unsigned </td><td class="memItemRight" valign="bottom"><b>GenerateWave</b> (<a class="el" href="structOceanWave.html">OceanWave</a> *wave, float *output, unsigned noOfFrames)</td></tr>
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float </td><td class="memItemRight" valign="bottom"><b>ProcessBiquad</b> (const <a class="el" href="structBiQuad.html">BiQuad</a> *coeffs, float *memory, float input)</td></tr>
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<a class="el" href="structOceanWave.html">OceanWave</a> * </td><td class="memItemRight" valign="bottom"><b>InitializeWave</b> (double SR, float attackInSeconds, float maxLevel, float positionLeftRight)</td></tr>
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int </td><td class="memItemRight" valign="bottom"><b>main</b> (void)</td></tr>
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</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Generate Pink Noise using Gardner method, and make "waves". Provides an example of how to post stuff to/from the audio callback using lock-free FIFOs implemented by the PA ringbuffer. </p>
<p>Optimization suggested by James McCartney uses a tree to select which random value to replace. </p>
<pre>
x x x x x x x x x x x x x x x x
x x x x x x x x
x x x x
x x
x
</pre><p> Tree is generated by counting trailing zeros in an increasing index. When the index is zero, no random number is selected.</p>
<dl class="section author"><dt>Author</dt><dd>Phil Burk <a href="http://www.softsynth.com">http://www.softsynth.com</a> Robert Bielik </dd></dl>
<p>Definition in file <a class="el" href="paex__ocean__shore_8c_source.html">paex_ocean_shore.c</a>.</p>
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