<?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>vbaplsinit</title> <link rel="stylesheet" type="text/css" href="csound.css" /> <link rel="stylesheet" type="text/css" href="syntax-highlighting.css" /> <meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /> <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="vbap8move.html" title="vbap8move" /> <link rel="next" href="vbapz.html" title="vbapz" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">vbaplsinit</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="vbap8move.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="vbapz.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry"> <a id="vbaplsinit"></a> <div class="titlepage"></div> <a id="IndexVbaplsinit" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">vbaplsinit</span> </h2> <p>vbaplsinit — Configures VBAP output according to loudspeaker parameters. </p> </div> <div class="refsect1"> <a id="idm281472875053832"></a> <h2>Description</h2> <p> Configures VBAP output according to loudspeaker parameters. </p> </div> <div class="refsect1"> <a id="idm281472875010344"></a> <h2>Syntax</h2> <pre class="synopsis"><span class="command"><strong>vbaplsinit</strong></span> idim, ilsnum [, idir1] [, idir2] [...] [, idir32]</pre> <pre class="synopsis"><span class="command"><strong>vbaplsinit</strong></span> idim, ilsnum, ilsarray</pre> </div> <div class="refsect1"> <a id="idm281472875007112"></a> <h2>Initialization</h2> <p> <span class="emphasis"><em>idim</em></span> -- dimensionality of loudspeaker array. Either 2 or 3. If the dimension has a fractional part then that is used as the index of the layout created (used in <span class="emphasis"><em>vbap</em></span>, <span class="emphasis"><em>vbapz</em></span> and <span class="emphasis"><em>vbapg</em></span> only). The factional part should be between .00 and .99. </p> <p> <span class="emphasis"><em>ilsnum</em></span> -- number of loudspeakers. In two dimensions, the number can vary from 2 to 64. In three dimensions, the number can vary from 3 and 64. </p> <p> <span class="emphasis"><em>idir1, idir2, ..., idir32</em></span> -- directions of loudspeakers. Number of directions must be less than or equal to 16. In two-dimensional loudspeaker positioning, <span class="emphasis"><em>idir</em></span>n is the azimuth angle respective to <span class="emphasis"><em>n</em></span>th channel. In three-dimensional loudspeaker positioning, fields are the azimuth and elevation angles of each loudspeaker consequently (<span class="emphasis"><em>azi1</em></span>, <span class="emphasis"><em>ele1</em></span>, <span class="emphasis"><em>azi2</em></span>, <span class="emphasis"><em>ele2</em></span>, etc.). </p> <p> <span class="emphasis"><em>ilsarray</em></span> -- a one dimesional array of the data as described above. </p> <p> </p> <div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"> <table border="0" summary="Note"> <tr> <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"> In 2 dimensions the angle between two adjacent speakers must be less than 179 degrees (170 degrees in earlier versions). This is a restriction of the algorithm.</td> </tr> </table> </div> <p> </p> </div> <div class="refsect1"> <a id="idm281472874997400"></a> <h2>Performance</h2> <p> VBAP distributes the signal using loudspeaker data configured with <span class="emphasis"><em>vbaplsinit</em></span>. The signal is applied to, at most, two loudspeakers in 2-D loudspeaker configurations, and three loudspeakers in 3-D loudspeaker configurations. If the virtual source is panned outside the region spanned by loudspeakers, the nearest loudspeakers are used in panning. </p> </div> <div class="refsect1"> <a id="idm281472874995512"></a> <h2>Examples</h2> <p> Here is an example of the vbaplsinit opcode. It uses the file <a class="ulink" href="examples/vbaplsinit.csd" target="_top"><em class="citetitle">vbaplsinit.csd</em></a>. </p> <div class="example"> <a id="idm281472874993656"></a> <p class="title"> <strong>Example 1059. Example of the vbaplsinit 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> <div class="refsect1"> <a id="idm281472695271736"></a> <pre class="programlisting"> <span class="nt"><CsoundSynthesizer></span> <span class="nt"><CsOptions></span> <span class="c1">; Select audio/midi flags here according to platform</span> -odac <span class="c1">;;;realtime audio out</span> <span class="c1">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span> <span class="c1">; For Non-realtime ouput leave only the line below:</span> <span class="c1">; -o vbaplsinit.wav -W ;;; for file output any platform</span> <span class="nt"></CsOptions></span> <span class="nt"><CsInstruments></span> <span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span> <span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span> <span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">8</span> <span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span> <span class="nb">vbaplsinit</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">8</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">45</span><span class="p">,</span> <span class="mi">90</span><span class="p">,</span> <span class="mi">180</span><span class="p">,</span> <span class="mi">270</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span> <span class="c1">;5 speakers for 5.1 amps</span> <span class="kd">instr</span> <span class="nf">1</span> a<span class="n">sig</span> <span class="nb">diskin2</span> <span class="s">"beats.wav"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;loop beats.wav</span> k<span class="n">azim</span> <span class="nb">line</span> <span class="mi">1</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="mi">355</span> a<span class="n">1</span><span class="p">,</span>a<span class="n">2</span><span class="p">,</span>a<span class="n">3</span><span class="p">,</span>a<span class="n">4</span><span class="p">,</span>a<span class="n">5</span><span class="p">,</span>a<span class="n">6</span><span class="p">,</span>a<span class="n">7</span><span class="p">,</span>a<span class="n">8</span> <span class="nb">vbap8</span> a<span class="n">sig</span><span class="p">,</span> k<span class="n">azim</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;change azimuth of soundsource</span> <span class="c1">; Speaker mapping</span> a<span class="n">FL</span> <span class="o">=</span> a<span class="n">1</span> <span class="c1">; Front Left</span> a<span class="n">MF</span> <span class="o">=</span> a<span class="n">5</span> <span class="c1">; Mid Front </span> a<span class="n">FR</span> <span class="o">=</span> a<span class="n">2</span> <span class="c1">; Front Right</span> a<span class="n">BL</span> <span class="o">=</span> a<span class="n">3</span> <span class="c1">; Back Left</span> a<span class="n">BR</span> <span class="o">=</span> a<span class="n">4</span> <span class="c1">; Back Right</span> <span class="nb">outo</span> a<span class="n">FL</span><span class="p">,</span>a<span class="n">FR</span><span class="p">,</span>a<span class="n">BL</span><span class="p">,</span>a<span class="n">BR</span><span class="p">,</span>a<span class="n">MF</span><span class="p">,</span>a<span class="n">6</span><span class="p">,</span>a<span class="n">7</span><span class="p">,</span>a<span class="n">8</span> <span class="c1">;a6, a7 and a8 are dummies </span> <span class="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">5</span> <span class="nb">e</span> <span class="nt"></CsScore></span> <span class="nt"></CsoundSynthesizer></span> </pre> </div> </div> </div> <p><br class="example-break" /> See the other entries of the vbap opcodes for different examples. </p> </div> <div class="refsect1"> <a id="idm281472874989272"></a> <h2>Reference</h2> <p> Ville Pulkki: <span class="quote">“<span class="quote">Virtual Sound Source Positioning Using Vector Base Amplitude Panning</span>”</span> <span class="emphasis"><em>Journal of the Audio Engineering Society</em></span>, 1997 June, Vol. 45/6, p. 456. </p> </div> <div class="refsect1"> <a id="idm281472874987160"></a> <h2>See Also</h2> <p> <a class="link" href="vbap.html" title="vbap"><em class="citetitle">vbap</em></a>, <a class="link" href="vbapg.html" title="vbapg"><em class="citetitle">vbapg</em></a>, <a class="link" href="vbap4.html" title="vbap4"><em class="citetitle">vbap4</em></a>, <a class="link" href="vbap4move.html" title="vbap4move"><em class="citetitle">vbap4move</em></a>, <a class="link" href="vbap8.html" title="vbap8"><em class="citetitle">vbap8</em></a>, <a class="link" href="vbap8move.html" title="vbap8move"><em class="citetitle">vbap8move</em></a>, <a class="link" href="vbap16.html" title="vbap16"><em class="citetitle">vbap16</em></a>, <a class="link" href="vbap16move.html" title="vbap16move"><em class="citetitle">vbap16move</em></a>, <a class="link" href="vbapz.html" title="vbapz"><em class="citetitle">vbapz</em></a>, <a class="link" href="vbapzmove.html" title="vbapzmove"><em class="citetitle">vbapzmove</em></a> </p> </div> <div class="refsect1"> <a id="idm281472874976408"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: Ville Pulkki</td> </tr> <tr> <td>Sibelius Academy Computer Music Studio</td> </tr> <tr> <td>Laboratory of Acoustics and Audio Signal Processing</td> </tr> <tr> <td>Helsinki University of Technology</td> </tr> <tr> <td>Helsinki, Finland</td> </tr> <tr> <td>May 2000</td> </tr> </table> <p> </p> <p>New in Csound Version 4.07</p> <p>Multiple layouts new ib version 5.17.14</p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="vbap8move.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="vbapz.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">vbap8move </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> vbapz</td> </tr> </table> </div> </body> </html>