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<a name="gst-plugins-good-plugins-alpha"></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-alpha.top_of_page"></a>alpha</span></h2>
<p>alpha</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-alpha.properties"></a><h2>Properties</h2>
<div class="informaltable"><table class="informaltable" 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="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--alpha" title="The “alpha” property">alpha</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--angle" title="The “angle” property">angle</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlphaMethod" title="enum GstAlphaMethod"><span class="type">GstAlphaMethod</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--method" title="The “method” property">method</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--noise-level" title="The “noise-level” property">noise-level</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--target-b" title="The “target-b” property">target-b</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--target-g" title="The “target-g” property">target-g</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--target-r" title="The “target-r” property">target-r</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--black-sensitivity" title="The “black-sensitivity” property">black-sensitivity</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--white-sensitivity" title="The “white-sensitivity” property">white-sensitivity</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--prefer-passthrough" title="The “prefer-passthrough” property">prefer-passthrough</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstAlpha"></a><div class="refsect1">
<a name="gst-plugins-good-plugins-alpha.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" 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-alpha.html#GstAlpha-struct" title="struct GstAlpha">GstAlpha</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlphaMethod" title="enum GstAlphaMethod">GstAlphaMethod</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-alpha.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
<span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
<span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html#GstObject-struct">GstObject</a>
<span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html#GstElement-struct">GstElement</a>
<span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0/GstBaseTransform.html#GstBaseTransform-struct">GstBaseTransform</a>
<span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gst-plugins-base-libs-1.0/gst-plugins-base-libs-gstvideofilter.html#GstVideoFilter-struct">GstVideoFilter</a>
<span class="lineart">╰──</span> GstAlpha
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-alpha.description"></a><h2>Description</h2>
<p>The alpha element adds an alpha channel to a video stream. The values
of the alpha channel can be either be set to a constant or can be
dynamically calculated via chroma keying, e.g. blue can be set as
the transparent color.</p>
<p>Sample pipeline:</p>
<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
4</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> videotestsrc pattern<span class="gtkdoc opt">=</span>snow <span class="gtkdoc opt">!</span> mixer<span class="gtkdoc opt">.</span>sink_0 \
videotestsrc pattern<span class="gtkdoc opt">=</span>smpte75 <span class="gtkdoc opt">!</span> alpha method<span class="gtkdoc opt">=</span>green <span class="gtkdoc opt">!</span> mixer<span class="gtkdoc opt">.</span>sink_1 \
videomixer name<span class="gtkdoc opt">=</span>mixer sink_0<span class="gtkdoc opt">::</span>zorder<span class="gtkdoc opt">=</span><span class="number">0</span> sink_1<span class="gtkdoc opt">::</span>zorder<span class="gtkdoc opt">=</span><span class="number">1</span> <span class="gtkdoc opt">!</span> \
videoconvert <span class="gtkdoc opt">!</span> autovideosink</pre></td>
</tr>
</tbody>
</table>
</div>
<p> This pipeline adds a alpha channel to the SMPTE color bars
with green as the transparent color and overlays the output on
top of a snow video stream.</p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.10.7.6.1"></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-alpha.html#plugin-alpha">alpha</a>
</td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Wim Taymans <wim.taymans@gmail.com>
Edward Hervey <edward.hervey@collabora.co.uk>
Jan Schmidt <thaytan@noraisin.net></td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Filter/Effect/Video</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.10.7.6.2"></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>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>video/x-raw, format=(string){ AYUV, ARGB, BGRA, ABGR, RGBA, Y444, xRGB, BGRx, xBGR, RGBx, RGB, BGR, Y42B, YUY2, YVYU, UYVY, I420, YV12, Y41B }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
</tbody>
</table></div>
<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>video/x-raw, format=(string){ AYUV, ARGB, BGRA, ABGR, RGBA, Y444, xRGB, BGRx, xBGR, RGBx, RGB, BGR, Y42B, YUY2, YVYU, UYVY, I420, YV12, Y41B }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-alpha.functions_details"></a><h2>Functions</h2>
<p></p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-alpha.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstAlpha-struct"></a><h3>struct GstAlpha</h3>
<pre class="programlisting">struct GstAlpha;</pre>
</div>
<hr>
<div class="refsect2">
<a name="GstAlphaMethod"></a><h3>enum GstAlphaMethod</h3>
<div class="refsect3">
<a name="GstAlphaMethod.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="ALPHA-METHOD-SET:CAPS"></a>ALPHA_METHOD_SET</p></td>
<td class="enum_member_description">
<p>Set/adjust alpha channel</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="ALPHA-METHOD-GREEN:CAPS"></a>ALPHA_METHOD_GREEN</p></td>
<td class="enum_member_description">
<p>Chroma Key green</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="ALPHA-METHOD-BLUE:CAPS"></a>ALPHA_METHOD_BLUE</p></td>
<td class="enum_member_description">
<p>Chroma Key blue</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="ALPHA-METHOD-CUSTOM:CAPS"></a>ALPHA_METHOD_CUSTOM</p></td>
<td class="enum_member_description">
<p>Chroma Key on target_r/g/b</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-alpha.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstAlpha--alpha"></a><h3>The <code class="literal">“alpha”</code> property</h3>
<pre class="programlisting"> “alpha” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a></pre>
<p>The value for the alpha channel.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: [0,1]</p>
<p>Default value: 1</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAlpha--angle"></a><h3>The <code class="literal">“angle”</code> property</h3>
<pre class="programlisting"> “angle” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a></pre>
<p>Size of the colorcube to change.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: [0,90]</p>
<p>Default value: 20</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAlpha--method"></a><h3>The <code class="literal">“method”</code> property</h3>
<pre class="programlisting"> “method” <a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlphaMethod" title="enum GstAlphaMethod"><span class="type">GstAlphaMethod</span></a></pre>
<p>How the alpha channels should be created.</p>
<p>Flags: Read / Write</p>
<p>Default value: Set/adjust alpha channel</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAlpha--noise-level"></a><h3>The <code class="literal">“noise-level”</code> property</h3>
<pre class="programlisting"> “noise-level” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a></pre>
<p>Size of noise radius.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: [0,64]</p>
<p>Default value: 2</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAlpha--target-b"></a><h3>The <code class="literal">“target-b”</code> property</h3>
<pre class="programlisting"> “target-b” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>The blue color value for custom RGB chroma keying.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: <= 255</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAlpha--target-g"></a><h3>The <code class="literal">“target-g”</code> property</h3>
<pre class="programlisting"> “target-g” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>The green color value for custom RGB chroma keying.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: <= 255</p>
<p>Default value: 255</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAlpha--target-r"></a><h3>The <code class="literal">“target-r”</code> property</h3>
<pre class="programlisting"> “target-r” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>The red color value for custom RGB chroma keying.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: <= 255</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAlpha--black-sensitivity"></a><h3>The <code class="literal">“black-sensitivity”</code> property</h3>
<pre class="programlisting"> “black-sensitivity” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Sensitivity to dark colors.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: <= 128</p>
<p>Default value: 100</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAlpha--white-sensitivity"></a><h3>The <code class="literal">“white-sensitivity”</code> property</h3>
<pre class="programlisting"> “white-sensitivity” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Sensitivity to bright colors.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: <= 128</p>
<p>Default value: 100</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAlpha--prefer-passthrough"></a><h3>The <code class="literal">“prefer-passthrough”</code> property</h3>
<pre class="programlisting"> “prefer-passthrough” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Don't do any processing for alpha=1.0 if possible.</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
</div>
</div>
</div>
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