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| <a href="#gst-plugins-good-plugins-audiowsinclimit.synopsis" class="shortcut">Top</a> |
| | |
| <a href="#gst-plugins-good-plugins-audiowsinclimit.description" class="shortcut">Description</a> |
| | |
| <a href="#gst-plugins-good-plugins-audiowsinclimit.object-hierarchy" class="shortcut">Object Hierarchy</a> |
| | |
| <a href="#gst-plugins-good-plugins-audiowsinclimit.properties" class="shortcut">Properties</a> |
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| <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://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 |
| +----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="idp9661376"></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> 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<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> 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<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> 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="idp8859440"></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="idp9974080"></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-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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