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<div class="refentry" title="GEN49">
<a id="GEN49"></a>
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<h2>
<span class="refentrytitle">GEN49</span>
</h2>
<p>GEN49 —
Transfers data from an MP3 soundfile into a function table.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp78432752"></a>
<h2>Description</h2>
<p>
This subroutine transfers data from an MP3 soundfile into a function table.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp78433424"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>f</strong></span># time size 49 filcod skiptime format</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp78434400"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>size</em></span> -- number of points in the
table. Ordinarily a power of 2 or a power-of-2 plus 1
(see <a class="link" href="f.html" title="f Statement (or Function Table Statement)"><em class="citetitle">f
statement</em></a>); the maximum tablesize is 16777216
(2<sup>24</sup>) points. The allocation of table
memory can be <span class="emphasis"><em>deferred</em></span> by setting this
parameter to 0; the size allocated is then the number of points
in the file (probably not a power-of-2), and the table is not
usable by normal oscillators, but it is usable by
a <a class="link" href="loscil.html" title="loscil"><em class="citetitle">loscil</em></a>
unit. The soundfile can also be mono or stereo.
</p>
<p>
<span class="emphasis"><em>filcod</em></span> -- integer or character-string
denoting the source soundfile name. An integer denotes the
file <span class="emphasis"><em>soundin</em></span>.<span class="emphasis"><em>filcod</em></span> ;
a character-string (in double quotes, spaces permitted) gives
the filename itself, optionally a full pathname. If not a full
path, the file is sought first in the current directory, then in
that given by the environment variable <a class="link" href="CommandEnvironment.html" title="Csound Environment Variables"><em class="citetitle">SSDIR</em></a> (if defined) then
by <a class="link" href="CommandEnvironment.html" title="Csound Environment Variables"><em class="citetitle">SFDIR</em></a>. See
also <a class="link" href="soundin.html" title="soundin"><em class="citetitle">soundin</em></a>.
</p>
<p>
<span class="emphasis"><em>skiptime</em></span> -- begin reading at <span class="emphasis"><em>skiptime</em></span> seconds into the file.
</p>
<p>
<span class="emphasis"><em>format</em></span> -- specifies the audio data-file format required:
</p>
<div class="literallayout">
<p><br />
1 - Mono file 3 - First channel (left)<br />
2 - Stereo file 4 - Second channel (right)<br />
</p>
</div>
<p>
</p>
<p>
If <span class="emphasis"><em>format</em></span> = 0 the sample format is taken from the soundfile header.
</p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note: Note">
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<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Note</th>
</tr>
<tr>
<td align="left" valign="top">
<p>
</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="disc">
<li class="listitem">
<p>
Reading stops at end-of-file or when the table is full. Table locations not filled will contain zeros.
</p>
</li>
<li class="listitem">
<p>
If p4 is positive, the table will be post-normalized (rescaled to a maximum absolute value of 1 after generation). A negative p4 will cause rescaling to be skipped.
</p>
</li>
</ul>
</div>
<p>
</p>
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<div class="refsect1" title="Examples">
<a id="idp78470288"></a>
<h2>Examples</h2>
<p>
Here is an example of the GEN49 routine. It uses the files <a class="ulink" href="examples/gen49.csd" target="_top"><em class="citetitle">gen49.csd</em></a>.
</p>
<div class="example">
<a id="idp78471256"></a>
<p class="title">
<strong>Example 1070. An example of the GEN49 routine.</strong>
</p>
<div class="example-contents">
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o gen49.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1
kcps <span class="op">=</span> <span class="ohdr">sr</span><span class="op">/</span><span class="opc">ftlen</span>(1)
asig <span class="opc">oscil</span> .8, kcps, 1
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span> 1 0 131072 49 "beats.mp3" 0 1 <span class="comment">;read an audio file (using GEN49).</span>
<span class="stamnt">i</span> 1 0 2
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
<span>This is the diagram of the waveforms of the GEN49 routine, as used in the example:</span>
</p>
<div class="mediaobject">
<img src="images/gen49.png" alt="f 1 0 131072 49 "beats.mp3" 0 1" />
<div class="caption">
<p>f 1 0 131072 49 "beats.mp3" 0 1</p>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp78474336"></a>
<h2>Credits</h2>
<p>Written by John ffitch</p>
<p>February 2009.</p>
</div>
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