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<div class="refentry" title="ftgen">
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<h2>
<span class="refentrytitle">ftgen</span>
</h2>
<p>ftgen —
Generate a score function table from within the orchestra.
</p>
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<div class="refsect1" title="Description">
<a id="id2922564"></a>
<h2>Description</h2>
<p>Generate a score function table from within the orchestra.</p>
</div>
<div class="refsect1" title="Syntax">
<a id="id2922583"></a>
<h2>Syntax</h2>
<pre class="synopsis">gir <span class="command"><strong>ftgen</strong></span> ifn, itime, isize, igen, iarga [, iargb ] [...]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="id2922602"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>gir</em></span> -- either a requested or automatically assigned table number above 100.
</p>
<p>
<span class="emphasis"><em>ifn</em></span> -- requested table number If <span class="emphasis"><em>ifn</em></span> is zero, the number is assigned automatically and the value placed in <span class="emphasis"><em>gir</em></span>. Any other value is used as the table number
</p>
<p>
<span class="emphasis"><em>itime</em></span> -- is ignored, but otherwise corresponds to p2 in the score <span class="emphasis"><em>f statement</em></span>.
</p>
<p>
<span class="emphasis"><em>isize</em></span> -- table size. Corresponds to p3 of the score <span class="emphasis"><em>f statement</em></span>.
</p>
<p>
<span class="emphasis"><em>igen</em></span> -- function table <span class="emphasis"><em>GEN</em></span> routine. Corresponds to p4 of the score <span class="emphasis"><em>f statement</em></span>.
</p>
<p>
<span class="emphasis"><em>iarga, iargb, ...</em></span> -- function table arguments. Correspond to p5 through p<span class="emphasis"><em>n</em></span> of the score <span class="emphasis"><em>f statement</em></span>.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="id2922691"></a>
<h2>Performance</h2>
<p>
This is equivalent to table generation in the score with the <span class="emphasis"><em>f statement</em></span>.
</p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
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<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Note]" src="images/note.png" />
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<th align="left">Note</th>
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<td align="left" valign="top">
<p>Csound was originally designed to support tables with power of two sizes only. Though this has changed in recent versions (you can use any size by using a negative number), many opcodes will not accept them.</p>
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<div class="warning" title="Warning" style="margin-left: 0.5in; margin-right: 0.5in;">
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<img alt="[Warning]" src="images/warning.png" />
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<th align="left">Warning</th>
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<p>
Although Csound will not protest if ftgen is used inside instr-endin statements, this is not the intended or supported use, and must be handled with care as it has global effects. (In particular, a different size usually leads to relocation of the table, which may cause a crash or otherwise erratic behaviour.
</p>
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<div class="refsect1" title="Examples">
<a id="id2923532"></a>
<h2>Examples</h2>
<p>
Here is an example of the ftgen opcode. It uses the file <a class="ulink" href="examples/ftgen.csd" target="_top"><em class="citetitle">ftgen.csd</em></a>.
</p>
<div class="example">
<a id="id2923548"></a>
<p class="title">
<b>Example 275. Example of the ftgen opcode.</b>
</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>
<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>
<span class="comment">; Audio out Audio in</span>
-odac -iadc <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o ftgen.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Table #1, a sine wave using the GEN10 routine.</span>
gitemp <span class="ohdr">ftgen</span> 1, 0, 16384, 10, 1
<span class="comment">; Instrument #1 - a basic oscillator.</span>
<span class="oblock">instr</span> 1
kamp <span class="op">=</span> 10000
kcps <span class="op">=</span> 440
<span class="comment">; Use Table #1.</span>
ifn <span class="op">=</span> 1
a1 <span class="opc">oscil</span> kamp, kcps, ifn
<span class="opc">out</span> a1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Play Instrument #1 for 2 seconds.</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" />
</p>
<p>
Here is another example of the ftgen opcode. It uses the file <a class="ulink" href="examples/ftgen-2.csd" target="_top"><em class="citetitle">ftgen-2.csd</em></a>.
</p>
<div class="example">
<a id="id2923596"></a>
<p class="title">
<b>Example 276. Example of the ftgen opcode.</b>
</p>
<div class="example-contents">
<p>
This example queries a file for it length to create an f-table of the appropriate size.
</p>
<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>
<span class="comment">; Audio out Audio in</span>
-odac -iadc <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o ftgen-2.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> 48000
<span class="ohdr">ksmps</span> <span class="op">=</span> 16
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="comment">;Example by Jonathan Murphy 2007</span>
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1
Sfile <span class="op">=</span> "beats.wav"
ilen <span class="opc">filelen</span> Sfile <span class="comment">; Find length</span>
isr <span class="opc">filesr</span> Sfile <span class="comment">; Find sample rate</span>
isamps <span class="op">=</span> ilen <span class="op">*</span> isr <span class="comment">; Total number of samples</span>
isize <span class="opc">init</span> 1
<span class="olabel">loop</span><span class="op">:</span>
isize <span class="op">=</span> isize <span class="op">*</span> 2
<span class="comment">; Loop until isize is greater than number of samples</span>
<span class="octrl">if</span> (isize <span class="op"><</span> isamps) <span class="octrl">igoto</span> <span class="olabel">loop</span>
itab <span class="ohdr">ftgen</span> 0, 0, isize, 1, Sfile, 0, 0, 0
<span class="opc">print</span> isize
<span class="opc">print</span> isamps
<span class="opc">turnoff</span>
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span>1 0 10
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
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<div class="refsect1" title="See also">
<a id="id2923619"></a>
<h2>See also</h2>
<p>
<a class="link" href="ScoreGenRef.html" title="GEN Routines"><em class="citetitle">GEN routine overview</em></a>, <a class="link" href="ftgentmp.html" title="ftgentmp"><em class="citetitle">ftgentmp</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="id2923644"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Barry L. Vercoe</td>
</tr>
<tr>
<td>M.I.T., Cambridge, Mass</td>
</tr>
<tr>
<td>1997</td>
</tr>
</table>
<p>
</p>
<p>Example written by Kevin Conder.</p>
<p>Added warning April 2002 by Rasmus Ekman</p>
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