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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Graphic Equalizer 2: C:/Project Marcel & Oliver/Graphic_Equalizer/src/audio.hcc File Reference</title>
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<a class="el" href="dir_000000.html">C:</a> / <a class="el" href="dir_000001.html">Project Marcel & Oliver</a> / <a class="el" href="dir_000002.html">Graphic_Equalizer</a> / <a class="el" href="dir_000004.html">src</a></div>
<h1>audio.hcc File Reference</h1><code>#include <stdlib.hch></code><br>
<code>#include "pal_master.hch"</code><br>
<code>#include "<a class="el" href="configuration_8hch-source.html">configuration.hch</a>"</code><br>
<code>#include "<a class="el" href="audio_8hch-source.html">audio.hch</a>"</code><br>
<p>
Include dependency graph for audio.hcc:<p><center><img src="audio_8hcc__incl.png" border="0" usemap="#audio.hcc_map" alt="Include dependency graph"></center>
<map name="audio.hcc_map">
<area href="configuration_8hch.html" shape="rect" coords="245,7,370,34" alt="">
<area href="audio_8hch.html" shape="rect" coords="394,7,474,34" alt="">
</map>
<p>
<a href="audio_8hcc-source.html">Go to the source code of this file.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">macro proc </td><td class="memItemRight" valign="bottom"><a class="el" href="audio_8hcc.html#a0">audio_init</a> (gain_level, input_source, sample_rate, AUDIOIN, AUDIOOUT)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set some inital values to the audio hardware. <a href="#a0"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">macro proc </td><td class="memItemRight" valign="bottom"><a class="el" href="audio_8hcc.html#a1">audio_main</a> (audiodata, AUDIOIN, AUDIOOUT)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Main audiodriver. This function never returns! It calls the audiohandlers and stores samples into a global array. Once 64 Samples are collected it raises a signal AUDIO_READY to let other processes know it's ready. We use quadruple buffering for audio input and double buffering for audio output. <a href="#a1"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
<h2><a class="anchor" name="generic">
Graphic Equalizer API</a></h2>
<h2><a class="anchor" name="project">
Project information.</a></h2>
Project Graphic Equalizer<br>
<dl compact><dt><b>Author:</b></dt><dd>O.M. Schinagl </dd></dl>
<dl compact><dt><b>Date:</b></dt><dd>20041011 </dd></dl>
<dl compact><dt><b>Version:</b></dt><dd>0.1</dd></dl>
<h2><a class="anchor" name="copyright">
Copyright</a></h2>
Copyright ©2004 Koninklijke Philips Electronics N.V. All rights reserved<h2><a class="anchor" name="history">
Change history</a></h2>
20041011: <br>
Initial version
<p>
Definition in file <a class="el" href="audio_8hcc-source.html">audio.hcc</a>.<hr><h2>Function Documentation</h2>
<a class="anchor" name="a0" doxytag="audio.hcc::audio_init"></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">macro proc audio_init </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">gain_level </td>
<td class="mdname" nowrap>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>input_source </td>
<td class="mdname" nowrap>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>sample_rate </td>
<td class="mdname" nowrap>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>AUDIOIN </td>
<td class="mdname" nowrap>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>AUDIOOUT </td>
<td class="mdname" nowrap></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Set some inital values to the audio hardware.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>gain_level</em> </td><td>Set the input amplifier to this amplification level. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>input_source</em> </td><td>Choose between microphone input or linein input. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>sample_rate</em> </td><td>Set the sample rate between 8000 and 48000</td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>void </dd></dl>
<dl compact><dt><b>Return values:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>void</em> </td><td></td></tr>
</table>
</dl>
<p>
Definition at line <a class="el" href="audio_8hcc-source.html#l00045">45</a> of file <a class="el" href="audio_8hcc-source.html">audio.hcc</a>.
<p>
Referenced by <a class="el" href="main_8hcc-source.html#l00051">main()</a>. </td>
</tr>
</table>
<a class="anchor" name="a1" doxytag="audio.hcc::audio_main"></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">macro proc audio_main </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">audiodata </td>
<td class="mdname" nowrap>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>AUDIOIN </td>
<td class="mdname" nowrap>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>AUDIOOUT </td>
<td class="mdname" nowrap></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Main audiodriver. This function never returns! It calls the audiohandlers and stores samples into a global array. Once 64 Samples are collected it raises a signal AUDIO_READY to let other processes know it's ready. We use quadruple buffering for audio input and double buffering for audio output.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>*audiodata</em> </td><td>pointer to audio information structure. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>AUDIOIN</em> </td><td>Audio Input Handler </td></tr>
<tr><td valign="top"></td><td valign="top"><em>AUDIOOUT</em> </td><td>Audio Output Handler</td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>Never Returns. </dd></dl>
<dl compact><dt><b>Return values:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>void</em> </td><td></td></tr>
</table>
</dl>
<p>
Definition at line <a class="el" href="audio_8hcc-source.html#l00076">76</a> of file <a class="el" href="audio_8hcc-source.html">audio.hcc</a>.
<p>
Referenced by <a class="el" href="main_8hcc-source.html#l00051">main()</a>. </td>
</tr>
</table>
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