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<h2>
<span class="refentrytitle">inch</span>
</h2>
<p>inch —
Reads from numbered channels in an external audio signal or stream.
</p>
</div>
<div class="refsect1">
<a id="idm281472923901544"></a>
<h2>Description</h2>
<p>
Reads from numbered channels in an external audio signal or stream.
</p>
</div>
<div class="refsect1">
<a id="idm281472923918984"></a>
<h2>Syntax</h2>
<pre class="synopsis">ain1[, ...] <span class="command"><strong>inch</strong></span> kchan1[,...]</pre>
</div>
<div class="refsect1">
<a id="idm281472923916776"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ain1, ...</em></span> - input audio signals
</p>
<p>
<span class="emphasis"><em>kchan1,...</em></span> - channel numbers
</p>
<p>
<span class="emphasis"><em>inch</em></span> reads from numbered channels
determined by the corresponding <span class="emphasis"><em>kchan</em></span> into
the associated <span class="emphasis"><em>ain</em></span>. If the command-line <a class="link" href="CommandFlags.html#FlagsMinusLowerI"><em class="citetitle">-i</em></a> flag is set, sound is read continuously from the audio input stream (e.g. <span class="emphasis"><em>stdin</em></span> or a soundfile). <span class="emphasis"><em>inch</em></span> can also be used to receive audio in realtime from the audio interface using <span class="emphasis"><em>-iadc</em></span>.
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
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</td>
<th align="left">Note</th>
</tr>
<tr>
<td align="left" valign="top">
<p>
The highest number for <span class="emphasis"><em>kchan</em></span> available for use with <span class="emphasis"><em>inch</em></span> depends on <a class="link" href="nchnls_i.html" title="nchnls_i"><em class="citetitle">nchnls_i</em></a>. If <span class="emphasis"><em>kchan</em></span> is greater than <span class="emphasis"><em>nchnls_i</em></span>, <span class="emphasis"><em>ain</em></span> will be silent. Note that <span class="emphasis"><em>inch</em></span> will give a warning but not an error in this case.
</p>
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<div class="refsect1">
<a id="idm281472923845640"></a>
<h2>Examples</h2>
<p>
Here is an example of the inch opcode. It uses the file <a class="ulink" href="examples/inch.csd" target="_top"><em class="citetitle">inch.csd</em></a>.
</p>
<div class="example">
<a id="idm281472923843784"></a>
<p class="title">
<strong>Example 428. Example of the inch opcode.</strong>
</p>
<div class="example-contents">
<div class="refsect1">
<a id="idm281472751541224"></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 -iadc <span class="c1">;;;realtime audio I/O</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; inch.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> <span class="c1">;nchnls channels in, two channels out</span>
a<span class="n">in1</span><span class="p">,</span> a<span class="n">inr</span> <span class="nb">inch</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span> <span class="c1">;grab your mic and sing</span>
a<span class="n">del</span> <span class="nb">linseg</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span><span class="mf">.5</span><span class="p">,</span> <span class="mf">0.02</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span><span class="mf">.5</span><span class="p">,</span> <span class="mi">0</span> <span class="c1">;max delay time = 20ms</span>
a<span class="n">outl</span> <span class="nb">flanger</span> a<span class="n">in1</span><span class="p">,</span> a<span class="n">del</span><span class="p">,</span> <span class="mf">.7</span>
a<span class="n">outr</span> <span class="nb">flanger</span> a<span class="n">in1</span><span class="p">,</span> a<span class="n">del</span><span class="o">*</span><span class="mi">2</span><span class="p">,</span> <span class="mf">.8</span>
<span class="nb">fout</span> <span class="s">"in_ch.wav"</span><span class="p">,</span> <span class="mi">14</span><span class="p">,</span> a<span class="n">outl</span><span class="p">,</span> a<span class="n">outr</span> <span class="c1">;write to stereo file,</span>
<span class="nb">outs</span> a<span class="n">outl</span><span class="p">,</span> a<span class="n">outr</span> <span class="c1">;16 bits with header</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">10</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" />
</p>
</div>
<div class="refsect1">
<a id="idm281472923841864"></a>
<h2>See Also</h2>
<p>
<a class="link" href="in32.html" title="in32"><em class="citetitle">in32</em></a>,
<a class="link" href="inx.html" title="inx"><em class="citetitle">inx</em></a>,
<a class="link" href="inz.html" title="inz"><em class="citetitle">inz</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472923837992"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: John ffitch</td>
</tr>
<tr>
<td>University of Bath/Codemist Ltd.</td>
</tr>
<tr>
<td>Bath, UK</td>
</tr>
<tr>
<td>May 2000</td>
</tr>
</table>
<p>
</p>
<p>New in Csound Version 4.07</p>
<p>Multiple arguments from version 5.13</p>
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