<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>audiowsincband</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.76.1">
<link rel="home" href="index.html" title="GStreamer Good Plugins 1.0 Plugins Reference Manual">
<link rel="up" href="ch01.html" title="gst-plugins-good Elements">
<link rel="prev" href="gst-plugins-good-plugins-audioiirfilter.html" title="audioiirfilter">
<link rel="next" href="gst-plugins-good-plugins-audiowsinclimit.html" title="audiowsinclimit">
<meta name="generator" content="GTK-Doc V1.18 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2">
<tr valign="middle">
<td><a accesskey="p" href="gst-plugins-good-plugins-audioiirfilter.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td>
<td><a accesskey="u" href="ch01.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td>
<th width="100%" align="center">GStreamer Good Plugins 1.0 Plugins Reference Manual</th>
<td><a accesskey="n" href="gst-plugins-good-plugins-audiowsinclimit.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td>
</tr>
<tr><td colspan="5" class="shortcuts">
<a href="#gst-plugins-good-plugins-audiowsincband.synopsis" class="shortcut">Top</a>
|
<a href="#gst-plugins-good-plugins-audiowsincband.description" class="shortcut">Description</a>
|
<a href="#gst-plugins-good-plugins-audiowsincband.object-hierarchy" class="shortcut">Object Hierarchy</a>
|
<a href="#gst-plugins-good-plugins-audiowsincband.properties" class="shortcut">Properties</a>
</td></tr>
</table>
<div class="refentry">
<a name="gst-plugins-good-plugins-audiowsincband"></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-audiowsincband.top_of_page"></a>audiowsincband</span></h2>
<p>audiowsincband — Band pass and band reject windowed sinc filter</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="gst-plugins-good-plugins-audiowsincband.synopsis"></a><h2>Synopsis</h2>
<a name="GstAudioWSincBand"></a><pre class="synopsis">struct <a class="link" href="gst-plugins-good-plugins-audiowsincband.html#GstAudioWSincBand-struct" title="struct GstAudioWSincBand">GstAudioWSincBand</a>;
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-audiowsincband.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://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</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
+----GstAudioWSincBand
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-audiowsincband.properties"></a><h2>Properties</h2>
<pre class="synopsis">
"<a class="link" href="gst-plugins-good-plugins-audiowsincband.html#GstAudioWSincBand--lower-frequency" title='The "lower-frequency" property'>lower-frequency</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a> : Read / Write
"<a class="link" href="gst-plugins-good-plugins-audiowsincband.html#GstAudioWSincBand--upper-frequency" title='The "upper-frequency" property'>upper-frequency</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a> : Read / Write
"<a class="link" href="gst-plugins-good-plugins-audiowsincband.html#GstAudioWSincBand--mode" title='The "mode" property'>mode</a>" <span class="type">GstAudioWSincBandMode</span> : Read / Write
"<a class="link" href="gst-plugins-good-plugins-audiowsincband.html#GstAudioWSincBand--window" title='The "window" property'>window</a>" <span class="type">GstAudioWSincBandWindow</span> : Read / Write
"<a class="link" href="gst-plugins-good-plugins-audiowsincband.html#GstAudioWSincBand--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
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-audiowsincband.description"></a><h2>Description</h2>
<p>
Attenuates all frequencies outside (bandpass) or inside (bandreject) of a frequency
band. 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 bandpass and bandreject 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="idp5244672"></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<span class="gtkdoc opt">-</span><span class="number">1.0</span> audiotestsrc freq<span class="gtkdoc opt">=</span><span class="number">1500</span> <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> audiosincband mode<span class="gtkdoc opt">=</span>band<span class="gtkdoc opt">-</span>pass lower<span class="gtkdoc opt">-</span>frequency<span class="gtkdoc opt">=</span><span class="number">3000</span> upper<span class="gtkdoc opt">-</span>frequency<span class="gtkdoc opt">=</span><span class="number">10000</span> length<span class="gtkdoc opt">=</span><span class="number">501</span> window<span class="gtkdoc opt">=</span>blackman <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> alsasink
gst<span class="gtkdoc opt">-</span>launch<span class="gtkdoc opt">-</span><span class="number">1.0</span> 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> audiowsincband mode<span class="gtkdoc opt">=</span>band<span class="gtkdoc opt">-</span>reject lower<span class="gtkdoc opt">-</span>frequency<span class="gtkdoc opt">=</span><span class="number">59</span> upper<span class="gtkdoc opt">-</span>frequency<span class="gtkdoc opt">=</span><span class="number">61</span> length<span class="gtkdoc opt">=</span><span class="number">10001</span> window<span class="gtkdoc opt">=</span>hamming <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> alsasink
gst<span class="gtkdoc opt">-</span>launch<span class="gtkdoc opt">-</span><span class="number">1.0</span> 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> audiowsincband mode<span class="gtkdoc opt">=</span>band<span class="gtkdoc opt">-</span>pass lower<span class="gtkdoc opt">-</span>frequency<span class="gtkdoc opt">=</span><span class="number">1000</span> upper<span class="gtkdoc opt">-</span>frequency<span class="gtkdoc opt">=</span><span class="number">2000</span> length<span class="gtkdoc opt">=</span><span class="number">31</span> <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="idp8579952"></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="idp9508512"></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, format=(string){ F32LE, F64LE }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string)interleaved</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, format=(string){ F32LE, F64LE }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string)interleaved</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-audiowsincband.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstAudioWSincBand-struct"></a><h3>struct GstAudioWSincBand</h3>
<pre class="programlisting">struct GstAudioWSincBand;</pre>
<p>
Opaque data structure.
</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-audiowsincband.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstAudioWSincBand--lower-frequency"></a><h3>The <code class="literal">"lower-frequency"</code> property</h3>
<pre class="programlisting"> "lower-frequency" <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 lower frequency (Hz).</p>
<p>Allowed values: [0,100000]</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioWSincBand--upper-frequency"></a><h3>The <code class="literal">"upper-frequency"</code> property</h3>
<pre class="programlisting"> "upper-frequency" <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 upper frequency (Hz).</p>
<p>Allowed values: [0,100000]</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioWSincBand--mode"></a><h3>The <code class="literal">"mode"</code> property</h3>
<pre class="programlisting"> "mode" <span class="type">GstAudioWSincBandMode</span> : Read / Write</pre>
<p>Band pass or band reject mode.</p>
<p>Default value: Band pass (default)</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioWSincBand--window"></a><h3>The <code class="literal">"window"</code> property</h3>
<pre class="programlisting"> "window" <span class="type">GstAudioWSincBandWindow</span> : Read / Write</pre>
<p>Window function to use.</p>
<p>Default value: Hamming window (default)</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioWSincBand--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>
</div>
</div>
<div class="footer">
<hr>
Generated by GTK-Doc V1.18</div>
</body>
</html>