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<a name="gst-plugins-good-plugins-v4l2src"></a><div class="titlepage"></div>
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<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-good-plugins-v4l2src.top_of_page"></a>v4l2src</span></h2>
<p>v4l2src — Reads frames from a Video4Linux2 device</p>
</td>
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</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-v4l2src.properties"></a><h2>Properties</h2>
<div class="informaltable"><table border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody>
<tr>
<td class="property_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src--device" title="The “device” property">device</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src--device-name" title="The “device-name” property">device-name</a></td>
<td class="property_flags">Read</td>
</tr>
<tr>
<td class="property_type"><span class="type">GstV4l2DeviceTypeFlags</span></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src--flags" title="The “flags” property">flags</a></td>
<td class="property_flags">Read</td>
</tr>
<tr>
<td class="property_type"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src--queue-size" title="The “queue-size” property">queue-size</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src--always-copy" title="The “always-copy” property">always-copy</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src--device-fd" title="The “device-fd” property">device-fd</a></td>
<td class="property_flags">Read</td>
</tr>
<tr>
<td class="property_type"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src--brightness" title="The “brightness” property">brightness</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src--contrast" title="The “contrast” property">contrast</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src--decimate" title="The “decimate” property">decimate</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src--hue" title="The “hue” property">hue</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src--saturation" title="The “saturation” property">saturation</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><span class="type">V4L2_TV_norms</span></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src--norm" title="The “norm” property">norm</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><span class="type">GstV4l2IOMode</span></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src--io-mode" title="The “io-mode” property">io-mode</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type">
<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstStructure.html"><span class="type">GstStructure</span></a> *</td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src--extra-controls" title="The “extra-controls” property">extra-controls</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src--force-aspect-ratio" title="The “force-aspect-ratio” property">force-aspect-ratio</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src--pixel-aspect-ratio" title="The “pixel-aspect-ratio” property">pixel-aspect-ratio</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-v4l2src.signals"></a><h2>Signals</h2>
<div class="informaltable"><table border="0">
<colgroup>
<col width="150px" class="signals_return">
<col width="300px" class="signals_name">
<col width="200px" class="signals_flags">
</colgroup>
<tbody><tr>
<td class="signal_type"><span class="returnvalue">void</span></td>
<td class="signal_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src-prepare-format" title="The “prepare-format” signal">prepare-format</a></td>
<td class="signal_flags">Run Last</td>
</tr></tbody>
</table></div>
</div>
<a name="GstV4l2Src"></a><div class="refsect1">
<a name="gst-plugins-good-plugins-v4l2src.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody><tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src-struct" title="struct GstV4l2Src">GstV4l2Src</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-v4l2src.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
<span class="lineart">╰──</span> <a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
<span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html">GstObject</a>
<span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html">GstElement</a>
<span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstBaseSrc.html">GstBaseSrc</a>
<span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstPushSrc.html">GstPushSrc</a>
<span class="lineart">╰──</span> GstV4l2Src
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-v4l2src.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GstV4l2Src implements
<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstUriHandler.html#GstURIHandler">GstURIHandler</a>, GstTuner, <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance">GstColorBalance</a> and <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstvideoorientation.html#GstVideoOrientation">GstVideoOrientation</a>.</p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-v4l2src.description"></a><h2>Description</h2>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.152.9.2.1"></a><h3>Element Information</h3>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">plugin</span></p></td>
<td>
<a class="link" href="gst-plugins-good-plugins-plugin-video4linux2.html#plugin-video4linux2">video4linux2</a>
</td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Edgard Lima &lt;edgard.lima@indt.org.br&gt;, Stefan Kost &lt;ensonic@users.sf.net&gt;</td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Source/Video</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.152.9.2.2"></a><h3>Element Pads</h3>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<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>image/jpeg</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/mpeg, mpegversion=(int)4, systemstream=(boolean)false</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/mpeg, mpegversion=(int)2</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/mpegts, systemstream=(boolean)true</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-bayer, format=(string){ bggr, gbrg, grbg, rggb }, width=(int)[ 1, 32768 ], height=(int)[ 1, 32768 ], framerate=(fraction)[ 0/1, 100/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-dv, systemstream=(boolean)true</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-h263, variant=(string)itu</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-h264, stream-format=(string)byte-stream, alignment=(string)au</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-pwc1, width=(int)[ 1, 32768 ], height=(int)[ 1, 32768 ], framerate=(fraction)[ 0/1, 100/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-pwc2, width=(int)[ 1, 32768 ], height=(int)[ 1, 32768 ], framerate=(fraction)[ 0/1, 100/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-raw, format=(string){ RGB15, RGB16, BGR, RGB, BGRx, BGRA, xRGB, ARGB, GRAY8, YVU9, YV12, YUY2, UYVY, Y42B, Y41B, NV12_64Z32, YUV9, I420, YVYU, NV21, NV12 }, width=(int)[ 1, 32768 ], height=(int)[ 1, 32768 ], framerate=(fraction)[ 0/1, 100/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-sonix, width=(int)[ 1, 32768 ], height=(int)[ 1, 32768 ], framerate=(fraction)[ 0/1, 100/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-vp8</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-v4l2src.functions_details"></a><h2>Functions</h2>
<p></p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-v4l2src.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstV4l2Src-struct"></a><h3>struct GstV4l2Src</h3>
<pre class="programlisting">struct GstV4l2Src;</pre>
<p>
</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-v4l2src.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstV4l2Src--device"></a><h3>The <code class="literal">“device”</code> property</h3>
<pre class="programlisting"> “device” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</pre>
<p>Device location.</p>
<p>Flags: Read / Write</p>
<p>Default value: "/dev/video0"</p>
</div>
<hr>
<div class="refsect2">
<a name="GstV4l2Src--device-name"></a><h3>The <code class="literal">“device-name”</code> property</h3>
<pre class="programlisting"> “device-name” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</pre>
<p>Name of the device.</p>
<p>Flags: Read</p>
<p>Default value: NULL</p>
</div>
<hr>
<div class="refsect2">
<a name="GstV4l2Src--flags"></a><h3>The <code class="literal">“flags”</code> property</h3>
<pre class="programlisting"> “flags” <span class="type">GstV4l2DeviceTypeFlags</span></pre>
<p>Device type flags.</p>
<p>Flags: Read</p>
</div>
<hr>
<div class="refsect2">
<a name="GstV4l2Src--queue-size"></a><h3>The <code class="literal">“queue-size”</code> property</h3>
<pre class="programlisting"> “queue-size” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Number of buffers to be enqueud in the driver in streaming mode.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: [1,16]</p>
<p>Default value: 2</p>
</div>
<hr>
<div class="refsect2">
<a name="GstV4l2Src--always-copy"></a><h3>The <code class="literal">“always-copy”</code> property</h3>
<pre class="programlisting"> “always-copy” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>If the buffer will or not be used directly from mmap.</p>
<p>Flags: Read / Write</p>
<p>Default value: TRUE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstV4l2Src--device-fd"></a><h3>The <code class="literal">“device-fd”</code> property</h3>
<pre class="programlisting"> “device-fd” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>File descriptor of the device.</p>
<p>Flags: Read</p>
<p>Allowed values: &gt;= G_MAXULONG</p>
<p>Default value: -1</p>
</div>
<hr>
<div class="refsect2">
<a name="GstV4l2Src--brightness"></a><h3>The <code class="literal">“brightness”</code> property</h3>
<pre class="programlisting"> “brightness” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>Picture brightness, or more precisely, the black level.</p>
<p>Flags: Read / Write</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstV4l2Src--contrast"></a><h3>The <code class="literal">“contrast”</code> property</h3>
<pre class="programlisting"> “contrast” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>Picture contrast or luma gain.</p>
<p>Flags: Read / Write</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstV4l2Src--decimate"></a><h3>The <code class="literal">“decimate”</code> property</h3>
<pre class="programlisting"> “decimate” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>Only use every nth frame.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: &gt;= 1</p>
<p>Default value: 1</p>
</div>
<hr>
<div class="refsect2">
<a name="GstV4l2Src--hue"></a><h3>The <code class="literal">“hue”</code> property</h3>
<pre class="programlisting"> “hue” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>Hue or color balance.</p>
<p>Flags: Read / Write</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstV4l2Src--saturation"></a><h3>The <code class="literal">“saturation”</code> property</h3>
<pre class="programlisting"> “saturation” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>Picture color saturation or chroma gain.</p>
<p>Flags: Read / Write</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstV4l2Src--norm"></a><h3>The <code class="literal">“norm”</code> property</h3>
<pre class="programlisting"> “norm” <span class="type">V4L2_TV_norms</span></pre>
<p>video standard.</p>
<p>Flags: Read / Write</p>
<p>Default value: none</p>
</div>
<hr>
<div class="refsect2">
<a name="GstV4l2Src--io-mode"></a><h3>The <code class="literal">“io-mode”</code> property</h3>
<pre class="programlisting"> “io-mode” <span class="type">GstV4l2IOMode</span></pre>
<p>I/O mode.</p>
<p>Flags: Read / Write</p>
<p>Default value: GST_V4L2_IO_AUTO</p>
</div>
<hr>
<div class="refsect2">
<a name="GstV4l2Src--extra-controls"></a><h3>The <code class="literal">“extra-controls”</code> property</h3>
<pre class="programlisting"> “extra-controls” <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstStructure.html"><span class="type">GstStructure</span></a> *</pre>
<p>Extra v4l2 controls (CIDs) for the device.</p>
<p>Flags: Read / Write</p>
</div>
<hr>
<div class="refsect2">
<a name="GstV4l2Src--force-aspect-ratio"></a><h3>The <code class="literal">“force-aspect-ratio”</code> property</h3>
<pre class="programlisting"> “force-aspect-ratio” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>When enabled, the pixel aspect ratio will be enforced.</p>
<p>Flags: Read / Write</p>
<p>Default value: TRUE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstV4l2Src--pixel-aspect-ratio"></a><h3>The <code class="literal">“pixel-aspect-ratio”</code> property</h3>
<pre class="programlisting"> “pixel-aspect-ratio” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</pre>
<p>Overwrite the pixel aspect ratio of the device.</p>
<p>Flags: Read / Write</p>
<p>Default value: "1/1"</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-v4l2src.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GstV4l2Src-prepare-format"></a><h3>The <code class="literal">“prepare-format”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="gst-plugins-good-plugins-v4l2src.html#GstV4l2Src"><span class="type">GstV4l2Src</span></a> *gstv4l2src,
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> arg1,
<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstCaps.html"><span class="type">GstCaps</span></a> *arg2,
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data)</pre>
<p>
</p>
<div class="refsect3">
<a name="id-1.2.152.13.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>gstv4l2src</p></td>
<td class="parameter_description"><p>the object which received the signal.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: Run Last</p>
</div>
</div>
</div>
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