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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#gst-plugins-good-plugins-audiowsinclimit.synopsis" class="shortcut">Top</a>
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<a href="#gst-plugins-good-plugins-audiowsinclimit.description" class="shortcut">Description</a>
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<a href="#gst-plugins-good-plugins-audiowsinclimit.object-hierarchy" class="shortcut">Object Hierarchy</a>
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<a href="#gst-plugins-good-plugins-audiowsinclimit.properties" class="shortcut">Properties</a>
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</table>
<div class="refentry">
<a name="gst-plugins-good-plugins-audiowsinclimit"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-good-plugins-audiowsinclimit.top_of_page"></a>audiowsinclimit</span></h2>
<p>audiowsinclimit — Low pass and high pass windowed sinc filter</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="gst-plugins-good-plugins-audiowsinclimit.synopsis"></a><h2>Synopsis</h2>
<a name="GstAudioWSincLimit"></a><pre class="synopsis">struct <a class="link" href="gst-plugins-good-plugins-audiowsinclimit.html#GstAudioWSincLimit-struct" title="struct GstAudioWSincLimit">GstAudioWSincLimit</a>;
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-audiowsinclimit.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html">GstObject</a>
+----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html">GstElement</a>
+----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstBaseTransform.html">GstBaseTransform</a>
+----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstaudiofilter.html#GstAudioFilter">GstAudioFilter</a>
+----GstAudioFXBaseFIRFilter
+----GstAudioWSincLimit
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-audiowsinclimit.properties"></a><h2>Properties</h2>
<pre class="synopsis">
"<a class="link" href="gst-plugins-good-plugins-audiowsinclimit.html#GstAudioWSincLimit--frequency" title='The "frequency" property'>frequency</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> : Read / Write
"<a class="link" href="gst-plugins-good-plugins-audiowsinclimit.html#GstAudioWSincLimit--length" title='The "length" property'>length</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write
"<a class="link" href="gst-plugins-good-plugins-audiowsinclimit.html#GstAudioWSincLimit--mode" title='The "mode" property'>mode</a>" <span class="type">GstAudioWSincLimitMode</span> : Read / Write
"<a class="link" href="gst-plugins-good-plugins-audiowsinclimit.html#GstAudioWSincLimit--window" title='The "window" property'>window</a>" <span class="type">GstAudioWSincLimitWindow</span> : Read / Write
"<a class="link" href="gst-plugins-good-plugins-audiowsinclimit.html#GstAudioWSincLimit--cutoff" title='The "cutoff" property'>cutoff</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a> : Read / Write
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-audiowsinclimit.description"></a><h2>Description</h2>
<p>
Attenuates all frequencies above the cutoff frequency (low-pass) or all frequencies below the
cutoff frequency (high-pass). The length parameter controls the rolloff, the window parameter
controls rolloff and stopband attenuation. The Hamming window provides a faster rolloff but a bit
worse stopband attenuation, the other way around for the Blackman window.
</p>
<p>
This element has the advantage over the Chebyshev lowpass and highpass filter that it has
a much better rolloff when using a larger kernel size and almost linear phase. The only
disadvantage is the much slower execution time with larger kernels.
</p>
<p>
</p>
<div class="refsect2">
<a name="idp9395184"></a><h3>Example launch line</h3>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3</pre></td>
<td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch audiotestsrc freq<span class="gtkdoc opt">=</span><span class="number">1500</span> <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> audiowsinclimit mode<span class="gtkdoc opt">=</span>low<span class="gtkdoc opt">-</span>pass frequency<span class="gtkdoc opt">=</span><span class="number">1000</span> length<span class="gtkdoc opt">=</span><span class="number">501</span> <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> alsasink
gst<span class="gtkdoc opt">-</span>launch filesrc location<span class="gtkdoc opt">=</span><span class="string">"melo1.ogg"</span> <span class="gtkdoc opt">!</span> oggdemux <span class="gtkdoc opt">!</span> vorbisdec <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> audiowsinclimit mode<span class="gtkdoc opt">=</span>high<span class="gtkdoc opt">-</span>pass frequency<span class="gtkdoc opt">=</span><span class="number">15000</span> length<span class="gtkdoc opt">=</span><span class="number">501</span> <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> alsasink
gst<span class="gtkdoc opt">-</span>launch audiotestsrc wave<span class="gtkdoc opt">=</span>white<span class="gtkdoc opt">-</span>noise <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> audiowsinclimit mode<span class="gtkdoc opt">=</span>low<span class="gtkdoc opt">-</span>pass frequency<span class="gtkdoc opt">=</span><span class="number">1000</span> length<span class="gtkdoc opt">=</span><span class="number">10001</span> window<span class="gtkdoc opt">=</span>blackman <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> alsasink</pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<p>
</p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="idp9144784"></a><h3>Element Information</h3>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">plugin</span></p></td>
<td>
<a class="link" href="gst-plugins-good-plugins-plugin-audiofx.html#plugin-audiofx">audiofx</a>
</td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Thomas Vander Stichele <thomas at apestaart dot org>, Steven W. Smith, Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>, Sebastian Dröge <sebastian.droege@collabora.co.uk></td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Filter/Effect/Audio</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="idp11197024"></a><h3>Element Pads</h3>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>sink</td>
</tr>
<tr>
<td><p><span class="term">direction</span></p></td>
<td>sink</td>
</tr>
<tr>
<td><p><span class="term">presence</span></p></td>
<td>always</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>audio/x-raw-float, width=(int){ 32, 64 }, endianness=(int)1234, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ]</td>
</tr>
</tbody>
</table></div>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>src</td>
</tr>
<tr>
<td><p><span class="term">direction</span></p></td>
<td>source</td>
</tr>
<tr>
<td><p><span class="term">presence</span></p></td>
<td>always</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>audio/x-raw-float, width=(int){ 32, 64 }, endianness=(int)1234, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ]</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-audiowsinclimit.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstAudioWSincLimit-struct"></a><h3>struct GstAudioWSincLimit</h3>
<pre class="programlisting">struct GstAudioWSincLimit;</pre>
<p>
Opaque data structure.
</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-audiowsinclimit.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstAudioWSincLimit--frequency"></a><h3>The <code class="literal">"frequency"</code> property</h3>
<pre class="programlisting"> "frequency" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> : Read / Write</pre>
<p>Cut-off Frequency (Hz).</p>
<p>Allowed values: >= 0</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioWSincLimit--length"></a><h3>The <code class="literal">"length"</code> property</h3>
<pre class="programlisting"> "length" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write</pre>
<p>Filter kernel length, will be rounded to the next odd number.</p>
<p>Allowed values: [3,256000]</p>
<p>Default value: 101</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioWSincLimit--mode"></a><h3>The <code class="literal">"mode"</code> property</h3>
<pre class="programlisting"> "mode" <span class="type">GstAudioWSincLimitMode</span> : Read / Write</pre>
<p>Low pass or high pass mode.</p>
<p>Default value: Low pass (default)</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioWSincLimit--window"></a><h3>The <code class="literal">"window"</code> property</h3>
<pre class="programlisting"> "window" <span class="type">GstAudioWSincLimitWindow</span> : Read / Write</pre>
<p>Window function to use.</p>
<p>Default value: Hamming window (default)</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioWSincLimit--cutoff"></a><h3>The <code class="literal">"cutoff"</code> property</h3>
<pre class="programlisting"> "cutoff" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a> : Read / Write</pre>
<p>Cut-off Frequency (Hz).</p>
<p>Allowed values: [0,100000]</p>
<p>Default value: 0</p>
</div>
</div>
</div>
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