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<a href="#gst-plugins-good-plugins-equalizer-nbands.synopsis" class="shortcut">Top</a>
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<a href="#gst-plugins-good-plugins-equalizer-nbands.description" class="shortcut">Description</a>
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<a href="#gst-plugins-good-plugins-equalizer-nbands.object-hierarchy" class="shortcut">Object Hierarchy</a>
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<a href="#gst-plugins-good-plugins-equalizer-nbands.implemented-interfaces" class="shortcut">Implemented Interfaces</a>
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<a href="#gst-plugins-good-plugins-equalizer-nbands.properties" class="shortcut">Properties</a>
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<div class="refentry">
<a name="gst-plugins-good-plugins-equalizer-nbands"></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-equalizer-nbands.top_of_page"></a>equalizer-nbands</span></h2>
<p>equalizer-nbands — Direct Form IIR equalizer</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="gst-plugins-good-plugins-equalizer-nbands.synopsis"></a><h2>Synopsis</h2>
<a name="GstIirEqualizerNBands"></a><pre class="synopsis">struct <a class="link" href="gst-plugins-good-plugins-equalizer-nbands.html#GstIirEqualizerNBands-struct" title="struct GstIirEqualizerNBands">GstIirEqualizerNBands</a>;
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-equalizer-nbands.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html">GstObject</a>
+----<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html">GstElement</a>
+----<a href="/usr/share/gtk-doc/html/gstreamer-libs-0.10/GstBaseTransform.html">GstBaseTransform</a>
+----<a href="/usr/share/gtk-doc/html/gst-plugins-base-libs-0.10/gst-plugins-base-libs-gstaudiofilter.html#GstAudioFilter">GstAudioFilter</a>
+----<a class="link" href="GstIirEqualizer.html" title="GstIirEqualizer">GstIirEqualizer</a>
+----GstIirEqualizerNBands
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-equalizer-nbands.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GstIirEqualizerNBands implements
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstChildProxy.html">GstChildProxy</a>.</p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-equalizer-nbands.properties"></a><h2>Properties</h2>
<pre class="synopsis">
"<a class="link" href="gst-plugins-good-plugins-equalizer-nbands.html#GstIirEqualizerNBands--num-bands" title='The "num-bands" property'>num-bands</a>" <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> : Read / Write / Construct
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-equalizer-nbands.description"></a><h2>Description</h2>
<p>
The n-band equalizer element is a fully parametric equalizer. It allows to
select between 1 and 64 bands and has properties on each band to change
the center frequency, band width and gain.
</p>
<p>
</p>
<div class="refsect2">
<a name="idp7317984"></a><h3>Example launch line</h3>
<div class="informalexample"><pre class="programlisting">
gst-launch filesrc location=song.ogg ! oggdemux ! vorbisdec ! audioconvert ! equalizer-nbands num-bands=15 band5::gain=6.0 ! alsasink
</pre></div> This make the equalizer use 15 bands and raises the volume of the 5th band by 6 db.
</div>
<p>
</p>
<hr>
<div class="refsect2">
<a name="idp5944608"></a><h3>Example code</h3>
<div class="informalexample"><pre class="programlisting">
#include <gst/gst.h>
...
typedef struct {
gfloat freq;
gfloat width;
gfloat gain;
} GstEqualizerBandState;
...
GstElement *equalizer;
GstObject *band;
gint i;
GstEqualizerBandState state[] = {
{ 120.0, 50.0, - 3.0},
{ 500.0, 20.0, 12.0},
{1503.0, 2.0, -20.0},
{6000.0, 1000.0, 6.0},
{3000.0, 120.0, 2.0}
};
...
equalizer = gst_element_factory_make ("equalizer-nbands", "equalizer");
g_object_set (G_OBJECT (equalizer), "num-bands", 5, NULL);
...
for (i = 0; i < 5; i++) {
band = gst_child_proxy_get_child_by_index (GST_CHILD_PROXY (equalizer), i);
g_object_set (G_OBJECT (band), "freq", state[i].freq,
"bandwidth", state[i].width,
"gain", state[i].gain);
g_object_unref (G_OBJECT (band));
}
...
</pre></div>
</div>
<p>
</p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="idp6790424"></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-equalizer.html#plugin-equalizer">equalizer</a>
</td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Benjamin Otte <otte@gnome.org>, Stefan Kost <ensonic@users.sf.net></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="idp4583040"></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-int, depth=(int)16, width=(int)16, endianness=(int)1234, signed=(boolean)true, rate=(int)[ 1000, 2147483647 ], channels=(int)[ 1, 2147483647 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> audio/x-raw-float, width=(int){ 32, 64 }, endianness=(int)1234, rate=(int)[ 1000, 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-int, depth=(int)16, width=(int)16, endianness=(int)1234, signed=(boolean)true, rate=(int)[ 1000, 2147483647 ], channels=(int)[ 1, 2147483647 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> audio/x-raw-float, width=(int){ 32, 64 }, endianness=(int)1234, rate=(int)[ 1000, 2147483647 ], channels=(int)[ 1, 2147483647 ]</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-equalizer-nbands.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstIirEqualizerNBands-struct"></a><h3>struct GstIirEqualizerNBands</h3>
<pre class="programlisting">struct GstIirEqualizerNBands;</pre>
<p>
</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-equalizer-nbands.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstIirEqualizerNBands--num-bands"></a><h3>The <code class="literal">"num-bands"</code> property</h3>
<pre class="programlisting"> "num-bands" <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> : Read / Write / Construct</pre>
<p>number of different bands to use.</p>
<p>Allowed values: [1,64]</p>
<p>Default value: 10</p>
</div>
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