<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>ftlen</title> <link rel="stylesheet" type="text/css" href="csound.css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.76.1" /> <link rel="home" href="index.html" title="The Canonical Csound Reference Manual" /> <link rel="up" href="OpcodesTop.html" title="Orchestra Opcodes and Operators" /> <link rel="prev" href="ftgentmp.html" title="ftgentmp" /> <link rel="next" href="ftload.html" title="ftload" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">ftlen</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="ftgentmp.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="ftload.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry" title="ftlen"> <a id="ftlen"></a> <div class="titlepage"></div> <a id="IndexFtlen" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">ftlen</span> </h2> <p>ftlen — Returns the size of a stored function table. </p> </div> <div class="refsect1" title="Description"> <a id="idp24727064"></a> <h2>Description</h2> <p> Returns the size of a stored function table. </p> </div> <div class="refsect1" title="Syntax"> <a id="idp24727792"></a> <h2>Syntax</h2> <pre class="synopsis"><span class="command"><strong>ftlen</strong></span>(x) (init-rate args only)</pre> </div> <div class="refsect1" title="Performance"> <a id="idp24738160"></a> <h2>Performance</h2> <p> Returns the size (number of points, excluding guard point) of stored function table, number <span class="emphasis"><em>x</em></span>. While most units referencing a stored table will automatically take its size into account (so tables can be of arbitrary length), this function reports the actual size if that is needed. Note that <span class="emphasis"><em>ftlen</em></span> will always return a power-of-2 value, i.e. the function table guard point (see <a class="link" href="f.html" title="f Statement (or Function Table Statement)"><em class="citetitle">f Statement</em></a>) is not included.As of Csound version 3.53, <span class="emphasis"><em>ftlen</em></span> works with deferred function tables (see <a class="link" href="GEN01.html" title="GEN01"><em class="citetitle">GEN01</em></a>). </p> <p> <span class="emphasis"><em>ftlen</em></span> differs from <span class="emphasis"><em>nsamp</em></span> in that <span class="emphasis"><em>nsamp</em></span> gives the number of sample frames loaded, while <span class="emphasis"><em>ftlen</em></span> gives the total number of samples without the guard point. For example, with a stereo sound file of 10000 samples, ftlen() would return 19999 (i.e. a total of 20000 mono samples, not including a guard point), but nsamp() returns 10000. </p> </div> <div class="refsect1" title="Examples"> <a id="idp24772584"></a> <h2>Examples</h2> <p> Here is an example of the ftlen opcode. It uses the file <a class="ulink" href="examples/ftlen.csd" target="_top"><em class="citetitle">ftlen.csd</em></a>, <a class="ulink" href="examples/fox.wav" target="_top"><em class="citetitle">fox.wav</em></a> and <a class="ulink" href="examples/beats.wav" target="_top"><em class="citetitle">beats.wav</em></a>. </p> <div class="example"> <a id="idp24774272"></a> <p class="title"> <strong>Example 309. Example of the ftlen 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> <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 ftlen.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 ift <span class="op">=</span> <span class="opc">ftlen</span>(p4) <span class="opc">print</span> ift aout <span class="opc">loscil3</span> .8, 4, p4 <span class="opc">outs</span> aout, aout <span class="oblock">endin</span> <span class="csdtag"></CsInstruments></span> <span class="csdtag"><CsScore></span> <span class="stamnt">f</span> 1 0 0 1 "<span class="stamnt">f</span>ox.wav" 0 0 0 <span class="comment">;Csound computes tablesize</span> <span class="stamnt">f</span> 2 0 0 1 "beats.wav" 0 0 0 <span class="comment">;Csound computes tablesize</span> <span class="stamnt">i</span> 1 0 3 1 <span class="comment">;"fox.wav"</span> <span class="stamnt">i</span> 1 3 3 2 <span class="comment">;"beats.wav"</span> <span class="stamnt">e</span> <span class="csdtag"></CsScore></span> <span class="csdtag"></CsoundSynthesizer></span> </pre> </div> </div> <p><br class="example-break" /> The audio file <span class="quote">“<span class="quote">fox.wav</span>”</span> is 121569 samples long, <span class="quote">“<span class="quote">beats.wav</span>”</span> has a length of 88200 samples. The ftlen opcode reports them as 121568 and 88199 samples, because it reserves 1 point for the guard point. Its output should include lines like these: </p> <pre class="screen"> instr 1: ift = 121568.000 instr 1: ift = 88199.000 </pre> <p> </p> </div> <div class="refsect1" title="See Also"> <a id="idp24777872"></a> <h2>See Also</h2> <p> <a class="link" href="ftchnls.html" title="ftchnls"><em class="citetitle">ftchnls</em></a>, <a class="link" href="ftlptim.html" title="ftlptim"><em class="citetitle">ftlptim</em></a>, <a class="link" href="ftsr.html" title="ftsr"><em class="citetitle">ftsr</em></a>, <a class="link" href="nsamp.html" title="nsamp"><em class="citetitle">nsamp</em></a> </p> </div> <div class="refsect1" title="Credits"> <a id="idp24780408"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: Barry L. Vercoe</td> </tr> <tr> <td>MIT</td> </tr> <tr> <td>Cambridge, Massachussetts</td> </tr> <tr> <td>1997</td> </tr> </table> <p> </p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="ftgentmp.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="OpcodesTop.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="ftload.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">ftgentmp </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> ftload</td> </tr> </table> </div> </body> </html>