<?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>pvsfread</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="pvsfilter.html" title="pvsfilter" /> <link rel="next" href="pvsfreeze.html" title="pvsfreeze" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">pvsfread</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="pvsfilter.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="pvsfreeze.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry" title="pvsfread"> <a id="pvsfread"></a> <div class="titlepage"></div> <a id="IndexPvsfread" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">pvsfread</span> </h2> <p>pvsfread — Read a selected channel from a PVOC-EX analysis file. </p> </div> <div class="refsect1" title="Description"> <a id="idp38670840"></a> <h2>Description</h2> <p> Create an fsig stream by reading a selected channel from a PVOC-EX analysis file loaded into memory, with frame interpolation. Only format 0 files (amplitude+frequency) are currently supported. The operation of this opcode mirrors that of pvoc, but outputs an fsig instead of a resynthesized signal. </p> </div> <div class="refsect1" title="Syntax"> <a id="idp38671752"></a> <h2>Syntax</h2> <pre class="synopsis">fsig <span class="command"><strong>pvsfread</strong></span> ktimpt, ifn [, ichan]</pre> </div> <div class="refsect1" title="Initialization"> <a id="idp38675088"></a> <h2>Initialization</h2> <p> <span class="emphasis"><em>ifn</em></span> -- Name of the analysis file. This must have the .pvx file extension. </p> <p> A multi-channel PVOC-EX file can be generated using the extended <a class="link" href="pvanal.html" title="pvanal"><em class="citetitle">pvanal utility</em></a>. </p> <p> <span class="emphasis"><em>ichan</em></span> -- (optional) The channel to read (counting from 0). Default is 0. </p> </div> <div class="refsect1" title="Performance"> <a id="idp38677200"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>ktimpt</em></span> -- Time pointer into analysis file, in seconds. See the description of the same parameter of <a class="link" href="pvoc.html" title="pvoc"><em class="citetitle">pvoc</em></a> for usage. </p> <p> Note that analysis files can be very large, especially if multi-channel. Reading such files into memory will very likely incur breaks in the audio during real-time performance. As the file is read only once, and is then available to all other interested opcodes, it can be expedient to arrange for a dedicated instrument to preload all such analysis files at startup. </p> </div> <div class="refsect1" title="Examples"> <a id="idp38679168"></a> <h2>Examples</h2> <p> Here is an example of the pvsfread opcode. It uses the file <a class="ulink" href="examples/pvsfread.csd" target="_top"><em class="citetitle">pvsfread.csd</em></a>. </p> <div class="example"> <a id="idp38723904"></a> <p class="title"> <strong>Example 654. Example of the pvsfread 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 pvsfread.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">0dbfs</span> <span class="op">=</span> 1 <span class="ohdr">nchnls</span> <span class="op">=</span> 2 <span class="oblock">instr</span> 1 <span class="comment">; create a PVOC-EX (*.pvx) file with PVANAL first</span> idur <span class="opc">filelen</span> "kickroll.pvx" <span class="comment">;find duration of (stereo) analysis file</span> kpos <span class="opc">line</span> 0,p3,idur <span class="comment">;to ensure we process whole file</span> fsigr <span class="opc">pvsfread</span> kpos,"kickroll.pvx", 1 <span class="comment">;create fsig from right channel</span> aout <span class="opc">pvsynth</span> fsigr <span class="comment">;resynthesise it</span> <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">i</span> 1 0 10 <span class="stamnt">i</span> 1 11 1 <span class="stamnt">e</span> <span class="csdtag"></CsScore></span> <span class="csdtag"></CsoundSynthesizer></span> </pre> </div> </div> <p><br class="example-break" /> </p> </div> <div class="refsect1" title="Credits"> <a id="idp38726184"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: Richard Dobson</td> </tr> <tr> <td>August 2001 </td> </tr> </table> <p> </p> <p>New in version 4.13</p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="pvsfilter.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="pvsfreeze.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">pvsfilter </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> pvsfreeze</td> </tr> </table> </div> </body> </html>