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<div class="refentry" title="vbaplsinit">
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<h2>
<span class="refentrytitle">vbaplsinit</span>
</h2>
<p>vbaplsinit —
Configures VBAP output according to loudspeaker parameters.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp50661384"></a>
<h2>Description</h2>
<p>
Configures VBAP output according to loudspeaker parameters.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp50655048"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>vbaplsinit</strong></span> idim, ilsnum [, idir1] [, idir2] [...] [, idir32]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp50656040"></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>
</p>
<div class="note" title="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" title="Performance">
<a id="idp50720208"></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" title="Examples">
<a id="idp50721368"></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="idp50722360"></a>
<p class="title">
<strong>Example 927. 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>
<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 vbaplsinit.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> 8
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="opc">vbaplsinit</span> 2, 8, 0, 45, 90, 180, 270, 0, 0, 0 <span class="comment">;5 speakers for 5.1 amps</span>
<span class="oblock">instr</span> 1
asig <span class="opc">diskin2</span> "beats.wav", 1, 0, 1 <span class="comment">;loop beats.wav</span>
kazim <span class="opc">line</span> 1, p3, 355
a1,a2,a3,a4,a5,a6,a7,a8 <span class="opc">vbap8</span> asig, kazim, 0, 1 <span class="comment">;change azimuth of soundsource</span>
<span class="comment">; Speaker mapping</span>
aFL <span class="op">=</span> a1 <span class="comment">; Front Left</span>
aMF <span class="op">=</span> a5 <span class="comment">; Mid Front </span>
aFR <span class="op">=</span> a2 <span class="comment">; Front Right</span>
aBL <span class="op">=</span> a3 <span class="comment">; Back Left</span>
aBR <span class="op">=</span> a4 <span class="comment">; Back Right</span>
<span class="opc">outo</span> aFL,aFR,aBL,aBR,aMF,a6,a7,a8 <span class="comment">;a6, a7 and a8 are dummies </span>
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 5
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
See the other entries of the vbap opcodes for different examples.
</p>
</div>
<div class="refsect1" title="Reference">
<a id="idp50724728"></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" title="See Also">
<a id="idp50725896"></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" title="Credits">
<a id="idp50731248"></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>
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