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<h2>
<span class="refentrytitle">filepeak</span>
</h2>
<p>filepeak —
Returns the peak absolute value of a sound file.
</p>
</div>
<div class="refsect1">
<a id="idm281472937823656"></a>
<h2>Description</h2>
<p>
Returns the peak absolute value of a sound file.
</p>
</div>
<div class="refsect1">
<a id="idm281472937822296"></a>
<h2>Syntax</h2>
<pre class="synopsis">ir <span class="command"><strong>filepeak</strong></span> ifilcod [, ichnl]</pre>
</div>
<div class="refsect1">
<a id="idm281472937751512"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifilcod</em></span> -- sound file to be queried
</p>
<p>
<span class="emphasis"><em>ichnl</em></span> (optional, default=0) -- channel to
be used in calculating the peak value. Default is 0.
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<p><span class="emphasis"><em>ichnl</em></span> = 0 returns peak value of all channels</p>
</li>
<li class="listitem">
<p><span class="emphasis"><em>ichnl</em></span> > 0 returns peak value of <span class="emphasis"><em>ichnl</em></span></p>
</li>
</ul>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a id="idm281472937745816"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>filepeak</em></span> returns the peak absolute value of the sound file <span class="emphasis"><em>ifilcod</em></span>.
</p>
</div>
<div class="refsect1">
<a id="idm281472937743672"></a>
<h2>Examples</h2>
<p>
Here is an example of the filepeak opcode. It uses the file <a class="ulink" href="examples/filepeak.csd" target="_top"><em class="citetitle">filepeak.csd</em></a>,
and <a class="ulink" href="examples/Church.wav" target="_top"><em class="citetitle">Church.wav</em></a>.
</p>
<div class="example">
<a id="idm281472937741048"></a>
<p class="title">
<strong>Example 271. Example of the filepeak opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<div class="refsect1">
<a id="idm281472769978456"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
-odac <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o filepeak.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
i<span class="n">scaldb</span> <span class="o">=</span> <span class="nb">p4</span> <span class="c1">;set peak amplitude in dB</span>
i<span class="n">peak</span> <span class="nb">filepeak</span> <span class="s">"Church.wav"</span>
i<span class="n">scal</span> <span class="o">=</span> <span class="nb">ampdb</span><span class="p">(</span>i<span class="n">scaldb</span><span class="p">)</span><span class="o">/</span>i<span class="n">peak</span> <span class="c1">;calculate amp multiplier</span>
<span class="nb">printf_i</span> <span class="s">"</span><span class="se">\n</span><span class="s">Peak value in file '%s' is %f (%.3f dB).</span><span class="se">\n\n</span><span class="s">"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="s">"Church.wav"</span><span class="p">,</span> i<span class="n">peak</span><span class="p">,</span> <span class="nb">dbamp</span><span class="p">(</span>i<span class="n">peak</span><span class="p">)</span>
a<span class="n">snd</span> <span class="nb">soundin</span> <span class="s">"Church.wav"</span>
<span class="nb">outs</span> a<span class="n">snd</span><span class="p">,</span> a<span class="n">snd</span>
<span class="c1">; scale & write file to disk</span>
a<span class="n">sig</span> <span class="o">=</span> a<span class="n">snd</span><span class="o">*</span>i<span class="n">scal</span> <span class="c1">;scale to p4</span>
<span class="nb">fout</span> <span class="s">"Church_norm.wav"</span><span class="p">,</span> <span class="mi">14</span><span class="p">,</span> a<span class="n">sig</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">2</span> <span class="c1">; play scaled file</span>
a<span class="n">out</span> <span class="nb">soundin</span> <span class="s">"Church_norm.wav"</span>
i<span class="n">pknew</span> <span class="nb">filepeak</span> <span class="s">"Church_norm.wav"</span>
<span class="nb">printf_i</span> <span class="s">"</span><span class="se">\n</span><span class="s">Peak value in file '%s' is %f (%.3f dB).</span><span class="se">\n\n</span><span class="s">"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="s">"Church_norm.wav"</span><span class="p">,</span> i<span class="n">pknew</span><span class="p">,</span> <span class="nb">dbamp</span><span class="p">(</span>i<span class="n">pknew</span><span class="p">)</span>
<span class="nb">outs</span> a<span class="n">out</span><span class="p">,</span> a<span class="n">out</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">2</span> <span class="o">-</span><span class="mi">6</span> <span class="c1">; normalize audio to -6 dB</span>
<span class="nb">i</span> <span class="mi">2</span> <span class="mi">2</span> <span class="mi">2</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
The <span class="emphasis"><em>filepeak</em></span>'s output should include lines like this:
</p>
<pre class="screen">
Peak value in file 'Church.wav' is 0.909363 (-0.825 dB).
Peak value in file 'Church_norm.wav' is 0.501190 (-6.000 dB).
</pre>
<p>
</p>
</div>
<div class="refsect1">
<a id="idm281472937735384"></a>
<h2>See Also</h2>
<p>
<a class="link" href="filelen.html" title="filelen"><em class="citetitle">filelen</em></a>,
<a class="link" href="filenchnls.html" title="filenchnls"><em class="citetitle">filenchnls</em></a>,
<a class="link" href="filesr.html" title="filesr"><em class="citetitle">filesr</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472937731320"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Matt Ingalls</td>
</tr>
<tr>
<td>July 1999</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 3.57</p>
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