<?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>readclock</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="rbjeq.html" title="rbjeq" /> <link rel="next" href="readf.html" title="readf" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">readclock</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="rbjeq.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="readf.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry" title="readclock"> <a id="readclock"></a> <div class="titlepage"></div> <a id="IndexReadClock" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">readclock</span> </h2> <p>readclock — Reads the value of an internal clock. </p> </div> <div class="refsect1" title="Description"> <a id="idp40055840"></a> <h2>Description</h2> <p> Reads the value of an internal clock. </p> </div> <div class="refsect1" title="Syntax"> <a id="idp40056552"></a> <h2>Syntax</h2> <pre class="synopsis">ir <span class="command"><strong>readclock</strong></span> inum</pre> </div> <div class="refsect1" title="Initialization"> <a id="idp40059968"></a> <h2>Initialization</h2> <p> <span class="emphasis"><em>inum</em></span> -- the number of a clock. There are 32 clocks numbered 0 through 31. All other values are mapped to clock number 32. </p> <p> <span class="emphasis"><em>ir</em></span> -- value at i-time, of the clock specified by <span class="emphasis"><em>inum</em></span> </p> </div> <div class="refsect1" title="Performance"> <a id="idp40061712"></a> <h2>Performance</h2> <p> Between a <a class="link" href="clockon.html" title="clockon"><em class="citetitle">clockon</em></a> and a <a class="link" href="clockoff.html" title="clockoff"><em class="citetitle">clockoff</em></a> opcode, the CPU time used is accumulated in the clock. The precision is machine dependent but is the millisecond range on UNIX and Windows systems. The <span class="emphasis"><em>readclock</em></span> opcde reads the current value of a clock at initialization time. </p> </div> <div class="refsect1" title="Examples"> <a id="idp40118576"></a> <h2>Examples</h2> <p> Here is an example of the readclock opcode. It uses the file <a class="ulink" href="examples/readclock.csd" target="_top"><em class="citetitle">readclock.csd</em></a>. </p> <div class="example"> <a id="idp40119576"></a> <p class="title"> <strong>Example 703. Example of the readclock 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> <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 readclock.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> 44100 <span class="ohdr">ksmps</span> <span class="op">=</span> 1 <span class="ohdr">nchnls</span> <span class="op">=</span> 1 <span class="comment">; Instrument #1.</span> <span class="oblock">instr</span> 1 <span class="comment">; Start clock #1.</span> <span class="opc">clockon</span> 1 <span class="comment">; Do something that keeps Csound busy.</span> a1 <span class="opc">oscili</span> 10000, 440, 1 <span class="opc">out</span> a1 <span class="comment">; Stop clock #1.</span> <span class="opc">clockoff</span> 1 <span class="comment">; Print the time accumulated in clock #1.</span> i1 <span class="opc">readclock</span> 1 <span class="opc">print</span> i1 <span class="oblock">endin</span> <span class="csdtag"></CsInstruments></span> <span class="csdtag"><CsScore></span> <span class="comment">; Initialize the function tables.</span> <span class="comment">; Table 1: an ordinary sine wave.</span> <span class="stamnt">f</span> 1 0 32768 10 1 <span class="comment">; Play Instrument #1 for one second starting at 0:00.</span> <span class="stamnt">i</span> 1 0 1 <span class="comment">; Play Instrument #1 for one second starting at 0:01.</span> <span class="stamnt">i</span> 1 1 1 <span class="comment">; Play Instrument #1 for one second starting at 0:02.</span> <span class="stamnt">i</span> 1 2 1 <span class="stamnt">e</span> <span class="csdtag"></CsScore></span> <span class="csdtag"></CsoundSynthesizer></span> </pre> </div> </div> <p><br class="example-break" /> Its output should include lines like this: </p> <pre class="screen"> instr 1: i1 = 0.000 instr 1: i1 = 90.000 instr 1: i1 = 180.000 </pre> <p> </p> </div> <div class="refsect1" title="See Also"> <a id="idp40122360"></a> <h2>See Also</h2> <p> <a class="link" href="clockoff.html" title="clockoff"><em class="citetitle">clockoff</em></a>, <a class="link" href="clockon.html" title="clockon"><em class="citetitle">clockon</em></a> </p> </div> <div class="refsect1" title="Credits"> <a id="idp40123896"></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>July, 1999</td> </tr> </table> <p> </p> <p>Example written by Kevin Conder.</p> <p>New in Csound version 3.56</p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="rbjeq.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="readf.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">rbjeq </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> readf</td> </tr> </table> </div> </body> </html>