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<a id="pvsbufread2"></a>
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<h2>
<span class="refentrytitle">pvsbufread2</span>
</h2>
<p>pvsbufread2 —
This opcode reads a circular buffer of f-signals (streaming PV signals), with binwise additional delays.
</p>
</div>
<div class="refsect1">
<a id="idm281472899734056"></a>
<h2>Description</h2>
<p>
This opcode reads from a circular buffer of length ilen (secs),
taking a handle for the buffer and a time pointer, which holds the
current read position (also in seconds). It is used in conjunction with a <span class="emphasis"><em>pvsbuffer</em></span> opocde.
Reading is circular, wrapping around at the end of the buffer. Extra delay times are taken from
a function table, with each point on it defining a delay time in seconds affecting the corresponding bin.
</p>
</div>
<div class="refsect1">
<a id="idm281472899689640"></a>
<h2>Syntax</h2>
<pre class="synopsis">fsig <span class="command"><strong>pvsbufread2</strong></span> ktime, khandle, ift1, ift2 </pre>
</div>
<div class="refsect1">
<a id="idm281472899687448"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ift1</em></span> -- function table with at least fftisze/2+1 points where delays (in secs) for bin amplitudes are
set (function table positions are equivalent to bin numbers)
</p>
<p>
<span class="emphasis"><em>ift2</em></span> -- function table with at least fftisze/2+1 points where delays (in secs) for bin frequencies are
set (function table positions are equivalent to bin numbers)
</p>
</div>
<div class="refsect1">
<a id="idm281472899684664"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>fsig</em></span> -- output pv stream
</p>
<p>
<span class="emphasis"><em>ktime</em></span> -- time position of reading pointer (in secs).
</p>
<p>
<span class="emphasis"><em>khandle</em></span> -- handle identifying the buffer to be read. When using k-rate
handles, it is important to initialise the k-rate variable to a given existing handle. When changing
buffers, fsig buffers need to be compatible (same fsig format).
</p>
<p>
With this opcode and <a class="link" href="pvsbuffer.html" title="pvsbuffer"><em class="citetitle">pvsbuffer</em></a>, it is possible to, among other things:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">time-stretch/compress a fsig stream, by reading it at
different rates</li>
<li class="listitem">delay a fsig or portions of it.</li>
<li class="listitem">'brassage' two or more fsigs by switching buffers, since
the reading handles are k-rate. Note that, when using k-rate
handles, it is important to initialise the k-rate variable to a
given handle (so that the fsig initialisation can take place)
and it is only possible to switch handles between compatible
fsig buffers (with the same fftsize and overlap).</li>
</ul>
</div>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note">
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<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">
<p>
It is important that the handle value passed to <span class="emphasis"><em>pvsbufread2</em></span> is valid and was created by <a class="link" href="pvsbuffer.html" title="pvsbuffer"><em class="citetitle">pvsbuffer</em></a>. Csound will crash with invalid handles.
</p>
</td>
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</div>
</div>
<div class="refsect1">
<a id="idm281472899675064"></a>
<h2>Examples</h2>
<p>
Here is an example of the pvsbufread2 opcode. It uses the file <a class="ulink" href="examples/pvsbufread2.csd" target="_top"><em class="citetitle">pvsbufread2.csd</em></a>.
</p>
<div class="example">
<a id="idm281472899673192"></a>
<p class="title">
<strong>Example 747. Example of the pvsbufread2 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="idm281472720886776"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">64</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="kd">instr</span> <span class="nf">1</span>
k<span class="n">cnt</span> <span class="nb">init</span> <span class="mi">0</span>
i<span class="n">fftsize</span> <span class="o">=</span> <span class="mi">2048</span>
i<span class="n">hop</span> <span class="o">=</span> i<span class="n">fftsize</span><span class="o">/</span><span class="mi">4</span>
a<span class="n">1</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>
a<span class="n">1</span> <span class="o">=</span> a<span class="n">1</span><span class="o">*</span><span class="mf">0.5</span>
<span class="n">fsig1</span> <span class="nb">pvsanal</span> a<span class="n">1</span><span class="p">,</span> i<span class="n">fftsize</span><span class="p">,</span> i<span class="n">hop</span><span class="p">,</span> i<span class="n">fftsize</span><span class="p">,</span> <span class="mi">1</span>
i<span class="n">h</span><span class="p">,</span> k<span class="n">t</span> <span class="nb">pvsbuffer</span> <span class="n">fsig1</span><span class="p">,</span> <span class="mi">10</span>
<span class="n">fsig2</span> <span class="nb">pvsbufread2</span> k<span class="n">t</span><span class="p">,</span> i<span class="n">h</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span>
<span class="n">fsig3</span> <span class="nb">pvsbufread2</span> k<span class="n">t</span><span class="p">,</span> i<span class="n">h</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">2</span>
a<span class="n">2</span> <span class="nb">pvsynth</span> <span class="n">fsig3</span>
a<span class="n">3</span> <span class="nb">pvsynth</span> <span class="n">fsig2</span>
<span class="nb">outs</span> a<span class="n">2</span><span class="p">,</span> a<span class="n">3</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">f</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">2048</span> <span class="o">-</span><span class="mi">7</span> <span class="mi">0</span> <span class="mi">128</span> <span class="mf">1.1</span> <span class="mi">128</span> <span class="mf">0.5</span> <span class="mi">256</span> <span class="mf">1.8</span> <span class="mi">512</span> <span class="mf">1.1</span> <span class="mi">1024</span> <span class="mf">0.1</span>
<span class="nb">f</span><span class="mi">2</span> <span class="mi">0</span> <span class="mi">2048</span> <span class="o">-</span><span class="mi">7</span> <span class="mi">1</span> <span class="mi">128</span> <span class="mf">0.2</span> <span class="mi">128</span> <span class="mf">0.05</span> <span class="mi">256</span> <span class="mf">0.5</span> <span class="mi">512</span> <span class="mf">0.9</span> <span class="mi">1024</span> <span class="mf">0.1</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">60</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472899668904"></a>
<h2>See Also</h2>
<p>
<a class="link" href="pvsanal.html" title="pvsanal"><em class="citetitle">pvsanal</em></a>,
<a class="link" href="pvsynth.html" title="pvsynth"><em class="citetitle">pvsynth</em></a>,
<a class="link" href="pvsbuffer.html" title="pvsbuffer"><em class="citetitle">pvsbuffer</em></a>,
<a class="link" href="pvsadsyn.html" title="pvsadsyn"><em class="citetitle">pvsadsyn</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472899663976"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Victor Lazzarini</td>
</tr>
<tr>
<td>July 2011</td>
</tr>
</table>
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</p>
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