docs/plugins/html/gst-plugins-good-plugins-alpha.html

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  20 <th width="100%" align="center">GStreamer Good Plugins 0.10 Plugins Reference Manual</th>
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  23 <tr><td colspan="5" class="shortcuts">
  24 <a href="#gst-plugins-good-plugins-alpha.synopsis" class="shortcut">Top</a>
  25                    |
  26                   <a href="#gst-plugins-good-plugins-alpha.description" class="shortcut">Description</a>
  27                    |
  28                   <a href="#gst-plugins-good-plugins-alpha.object-hierarchy" class="shortcut">Object Hierarchy</a>
  29                    |
  30                   <a href="#gst-plugins-good-plugins-alpha.properties" class="shortcut">Properties</a>
  31 </td></tr>
  32 </table>
  33 <div class="refentry">
  34 <a name="gst-plugins-good-plugins-alpha"></a><div class="titlepage"></div>
  35 <div class="refnamediv"><table width="100%"><tr>
  36 <td valign="top">
  37 <h2><span class="refentrytitle"><a name="gst-plugins-good-plugins-alpha.top_of_page"></a>alpha</span></h2>
  38 <p>alpha — Adds an alpha channel to video - uniform or via chroma-keying</p>
  39 </td>
  40 <td valign="top" align="right"></td>
  41 </tr></table></div>
  42 <div class="refsynopsisdiv">
  43 <a name="gst-plugins-good-plugins-alpha.synopsis"></a><h2>Synopsis</h2>
  44 <a name="GstAlpha"></a><pre class="synopsis">struct              <a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha-struct" title="struct GstAlpha">GstAlpha</a>;
  45 enum                <a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlphaMethod" title="enum GstAlphaMethod">GstAlphaMethod</a>;
  46 </pre>
  47 </div>
  48 <div class="refsect1">
  49 <a name="gst-plugins-good-plugins-alpha.object-hierarchy"></a><h2>Object Hierarchy</h2>
  50 <pre class="synopsis">
  51   <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
  52    +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html">GstObject</a>
  53          +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html">GstElement</a>
  54                +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstBaseTransform.html">GstBaseTransform</a>
  55                      +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstvideofilter.html#GstVideoFilter">GstVideoFilter</a>
  56                            +----GstAlpha
  57 </pre>
  58 </div>
  59 <div class="refsect1">
  60 <a name="gst-plugins-good-plugins-alpha.properties"></a><h2>Properties</h2>
  61 <pre class="synopsis">
  62   "<a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--alpha" title='The "alpha" property'>alpha</a>"                    <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a>               : Read / Write
  63   "<a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--angle" title='The "angle" property'>angle</a>"                    <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a>                : Read / Write
  64   "<a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--method" title='The "method" property'>method</a>"                   <a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlphaMethod" title="enum GstAlphaMethod"><span class="type">GstAlphaMethod</span></a>        : Read / Write
  65   "<a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--noise-level" title='The "noise-level" property'>noise-level</a>"              <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a>                : Read / Write
  66   "<a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--target-b" title='The "target-b" property'>target-b</a>"                 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a>                 : Read / Write
  67   "<a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--target-g" title='The "target-g" property'>target-g</a>"                 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a>                 : Read / Write
  68   "<a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--target-r" title='The "target-r" property'>target-r</a>"                 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a>                 : Read / Write
  69   "<a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--black-sensitivity" title='The "black-sensitivity" property'>black-sensitivity</a>"        <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a>                 : Read / Write
  70   "<a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--white-sensitivity" title='The "white-sensitivity" property'>white-sensitivity</a>"        <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a>                 : Read / Write
  71   "<a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlpha--prefer-passthrough" title='The "prefer-passthrough" property'>prefer-passthrough</a>"       <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read / Write
  72 </pre>
  73 </div>
  74 <div class="refsect1">
  75 <a name="gst-plugins-good-plugins-alpha.description"></a><h2>Description</h2>
  76 <p>
  77 The alpha element adds an alpha channel to a video stream. The values
  78 of the alpha channel can be either be set to a constant or can be
  79 dynamically calculated via chroma keying, e.g. blue can be set as
  80 the transparent color.
  81 </p>
  82 <p>
  83 Sample pipeline:
  84 </p>
  85 <div class="informalexample">
  86   <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
  87     <tbody>
  88       <tr>
  89         <td class="listing_lines" align="right"><pre>1
  90 2
  91 3</pre></td>
  92         <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch 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> \
  93   videomixer name<span class="gtkdoc opt">=</span>mixer <span class="gtkdoc opt">!</span> ffmpegcolorspace <span class="gtkdoc opt">!</span> autovideosink     \
  94   videotestsrc pattern<span class="gtkdoc opt">=</span>snow <span class="gtkdoc opt">!</span> mixer<span class="gtkdoc opt">.</span></pre></td>
  95       </tr>
  96     </tbody>
  97   </table>
  98 </div>
  99
 100 <p> This pipeline adds a alpha channel to the SMPTE color bars
 101 with green as the transparent color and mixes the output with
 102 a snow video stream.
 103 </p>
 104 <div class="refsynopsisdiv">
 105 <h2>Synopsis</h2>
 106 <div class="refsect2">
 107 <a name="idp8621056"></a><h3>Element Information</h3>
 108 <div class="variablelist"><table border="0">
 109 <col align="left" valign="top">
 110 <tbody>
 111 <tr>
 112 <td><p><span class="term">plugin</span></p></td>
 113 <td>
 114             <a class="link" href="gst-plugins-good-plugins-plugin-alpha.html#plugin-alpha">alpha</a>
 115           </td>
 116 </tr>
 117 <tr>
 118 <td><p><span class="term">author</span></p></td>
 119 <td>Wim Taymans &lt;wim@fluendo.com&gt;
 120 Edward Hervey &lt;edward.hervey@collabora.co.uk&gt;
 121 Jan Schmidt &lt;thaytan@noraisin.net&gt;</td>
 122 </tr>
 123 <tr>
 124 <td><p><span class="term">class</span></p></td>
 125 <td>Filter/Effect/Video</td>
 126 </tr>
 127 </tbody>
 128 </table></div>
 129 </div>
 130 <hr>
 131 <div class="refsect2">
 132 <a name="idp9474736"></a><h3>Element Pads</h3>
 133 <div class="variablelist"><table border="0">
 134 <col align="left" valign="top">
 135 <tbody>
 136 <tr>
 137 <td><p><span class="term">name</span></p></td>
 138 <td>sink</td>
 139 </tr>
 140 <tr>
 141 <td><p><span class="term">direction</span></p></td>
 142 <td>sink</td>
 143 </tr>
 144 <tr>
 145 <td><p><span class="term">presence</span></p></td>
 146 <td>always</td>
 147 </tr>
 148 <tr>
 149 <td><p><span class="term">details</span></p></td>
 150 <td>video/x-raw-yuv, format=(fourcc)AYUV, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 151 </tr>
 152 <tr>
 153 <td><p><span class="term"></span></p></td>
 154 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)32, endianness=(int)4321, red_mask=(int)16711680, green_mask=(int)65280, blue_mask=(int)255, alpha_mask=(int)-16777216, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 155 </tr>
 156 <tr>
 157 <td><p><span class="term"></span></p></td>
 158 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)32, endianness=(int)4321, red_mask=(int)65280, green_mask=(int)16711680, blue_mask=(int)-16777216, alpha_mask=(int)255, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 159 </tr>
 160 <tr>
 161 <td><p><span class="term"></span></p></td>
 162 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)32, endianness=(int)4321, red_mask=(int)255, green_mask=(int)65280, blue_mask=(int)16711680, alpha_mask=(int)-16777216, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 163 </tr>
 164 <tr>
 165 <td><p><span class="term"></span></p></td>
 166 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)32, endianness=(int)4321, red_mask=(int)-16777216, green_mask=(int)16711680, blue_mask=(int)65280, alpha_mask=(int)255, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 167 </tr>
 168 <tr>
 169 <td><p><span class="term"></span></p></td>
 170 <td> video/x-raw-yuv, format=(fourcc)Y444, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 171 </tr>
 172 <tr>
 173 <td><p><span class="term"></span></p></td>
 174 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)24, endianness=(int)4321, red_mask=(int)16711680, green_mask=(int)65280, blue_mask=(int)255, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 175 </tr>
 176 <tr>
 177 <td><p><span class="term"></span></p></td>
 178 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)24, endianness=(int)4321, red_mask=(int)65280, green_mask=(int)16711680, blue_mask=(int)-16777216, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 179 </tr>
 180 <tr>
 181 <td><p><span class="term"></span></p></td>
 182 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)24, endianness=(int)4321, red_mask=(int)255, green_mask=(int)65280, blue_mask=(int)16711680, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 183 </tr>
 184 <tr>
 185 <td><p><span class="term"></span></p></td>
 186 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)24, endianness=(int)4321, red_mask=(int)-16777216, green_mask=(int)16711680, blue_mask=(int)65280, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 187 </tr>
 188 <tr>
 189 <td><p><span class="term"></span></p></td>
 190 <td> video/x-raw-rgb, bpp=(int)24, depth=(int)24, endianness=(int)4321, red_mask=(int)16711680, green_mask=(int)65280, blue_mask=(int)255, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 191 </tr>
 192 <tr>
 193 <td><p><span class="term"></span></p></td>
 194 <td> video/x-raw-rgb, bpp=(int)24, depth=(int)24, endianness=(int)4321, red_mask=(int)255, green_mask=(int)65280, blue_mask=(int)16711680, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 195 </tr>
 196 <tr>
 197 <td><p><span class="term"></span></p></td>
 198 <td> video/x-raw-yuv, format=(fourcc)Y42B, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 199 </tr>
 200 <tr>
 201 <td><p><span class="term"></span></p></td>
 202 <td> video/x-raw-yuv, format=(fourcc)YUY2, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 203 </tr>
 204 <tr>
 205 <td><p><span class="term"></span></p></td>
 206 <td> video/x-raw-yuv, format=(fourcc)YVYU, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 207 </tr>
 208 <tr>
 209 <td><p><span class="term"></span></p></td>
 210 <td> video/x-raw-yuv, format=(fourcc)UYVY, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 211 </tr>
 212 <tr>
 213 <td><p><span class="term"></span></p></td>
 214 <td> video/x-raw-yuv, format=(fourcc)I420, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 215 </tr>
 216 <tr>
 217 <td><p><span class="term"></span></p></td>
 218 <td> video/x-raw-yuv, format=(fourcc)YV12, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 219 </tr>
 220 <tr>
 221 <td><p><span class="term"></span></p></td>
 222 <td> video/x-raw-yuv, format=(fourcc)Y41B, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 223 </tr>
 224 </tbody>
 225 </table></div>
 226 <div class="variablelist"><table border="0">
 227 <col align="left" valign="top">
 228 <tbody>
 229 <tr>
 230 <td><p><span class="term">name</span></p></td>
 231 <td>src</td>
 232 </tr>
 233 <tr>
 234 <td><p><span class="term">direction</span></p></td>
 235 <td>source</td>
 236 </tr>
 237 <tr>
 238 <td><p><span class="term">presence</span></p></td>
 239 <td>always</td>
 240 </tr>
 241 <tr>
 242 <td><p><span class="term">details</span></p></td>
 243 <td>video/x-raw-yuv, format=(fourcc)AYUV, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 244 </tr>
 245 <tr>
 246 <td><p><span class="term"></span></p></td>
 247 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)32, endianness=(int)4321, red_mask=(int)16711680, green_mask=(int)65280, blue_mask=(int)255, alpha_mask=(int)-16777216, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 248 </tr>
 249 <tr>
 250 <td><p><span class="term"></span></p></td>
 251 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)32, endianness=(int)4321, red_mask=(int)65280, green_mask=(int)16711680, blue_mask=(int)-16777216, alpha_mask=(int)255, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 252 </tr>
 253 <tr>
 254 <td><p><span class="term"></span></p></td>
 255 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)32, endianness=(int)4321, red_mask=(int)255, green_mask=(int)65280, blue_mask=(int)16711680, alpha_mask=(int)-16777216, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 256 </tr>
 257 <tr>
 258 <td><p><span class="term"></span></p></td>
 259 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)32, endianness=(int)4321, red_mask=(int)-16777216, green_mask=(int)16711680, blue_mask=(int)65280, alpha_mask=(int)255, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 260 </tr>
 261 <tr>
 262 <td><p><span class="term"></span></p></td>
 263 <td> video/x-raw-yuv, format=(fourcc)Y444, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 264 </tr>
 265 <tr>
 266 <td><p><span class="term"></span></p></td>
 267 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)24, endianness=(int)4321, red_mask=(int)16711680, green_mask=(int)65280, blue_mask=(int)255, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 268 </tr>
 269 <tr>
 270 <td><p><span class="term"></span></p></td>
 271 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)24, endianness=(int)4321, red_mask=(int)65280, green_mask=(int)16711680, blue_mask=(int)-16777216, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 272 </tr>
 273 <tr>
 274 <td><p><span class="term"></span></p></td>
 275 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)24, endianness=(int)4321, red_mask=(int)255, green_mask=(int)65280, blue_mask=(int)16711680, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 276 </tr>
 277 <tr>
 278 <td><p><span class="term"></span></p></td>
 279 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)24, endianness=(int)4321, red_mask=(int)-16777216, green_mask=(int)16711680, blue_mask=(int)65280, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 280 </tr>
 281 <tr>
 282 <td><p><span class="term"></span></p></td>
 283 <td> video/x-raw-rgb, bpp=(int)24, depth=(int)24, endianness=(int)4321, red_mask=(int)16711680, green_mask=(int)65280, blue_mask=(int)255, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 284 </tr>
 285 <tr>
 286 <td><p><span class="term"></span></p></td>
 287 <td> video/x-raw-rgb, bpp=(int)24, depth=(int)24, endianness=(int)4321, red_mask=(int)255, green_mask=(int)65280, blue_mask=(int)16711680, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 288 </tr>
 289 <tr>
 290 <td><p><span class="term"></span></p></td>
 291 <td> video/x-raw-yuv, format=(fourcc)Y42B, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 292 </tr>
 293 <tr>
 294 <td><p><span class="term"></span></p></td>
 295 <td> video/x-raw-yuv, format=(fourcc)YUY2, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 296 </tr>
 297 <tr>
 298 <td><p><span class="term"></span></p></td>
 299 <td> video/x-raw-yuv, format=(fourcc)YVYU, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 300 </tr>
 301 <tr>
 302 <td><p><span class="term"></span></p></td>
 303 <td> video/x-raw-yuv, format=(fourcc)UYVY, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 304 </tr>
 305 <tr>
 306 <td><p><span class="term"></span></p></td>
 307 <td> video/x-raw-yuv, format=(fourcc)I420, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 308 </tr>
 309 <tr>
 310 <td><p><span class="term"></span></p></td>
 311 <td> video/x-raw-yuv, format=(fourcc)YV12, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 312 </tr>
 313 <tr>
 314 <td><p><span class="term"></span></p></td>
 315 <td> video/x-raw-yuv, format=(fourcc)Y41B, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 316 </tr>
 317 </tbody>
 318 </table></div>
 319 </div>
 320 </div>
 321 <p>
 322 </p>
 323 </div>
 324 <div class="refsect1">
 325 <a name="gst-plugins-good-plugins-alpha.details"></a><h2>Details</h2>
 326 <div class="refsect2">
 327 <a name="GstAlpha-struct"></a><h3>struct GstAlpha</h3>
 328 <pre class="programlisting">struct GstAlpha;</pre>
 329 <p>
 330 </p>
 331 </div>
 332 <hr>
 333 <div class="refsect2">
 334 <a name="GstAlphaMethod"></a><h3>enum GstAlphaMethod</h3>
 335 <pre class="programlisting">typedef enum {
 336   ALPHA_METHOD_SET,
 337   ALPHA_METHOD_GREEN,
 338   ALPHA_METHOD_BLUE,
 339   ALPHA_METHOD_CUSTOM,
 340 } GstAlphaMethod;
 341 </pre>
 342 <div class="variablelist"><table border="0">
 343 <col align="left" valign="top">
 344 <tbody>
 345 <tr>
 346 <td><p><a name="ALPHA-METHOD-SET:CAPS"></a><span class="term"><code class="literal">ALPHA_METHOD_SET</code></span></p></td>
 347 <td>Set/adjust alpha channel
 348 </td>
 349 </tr>
 350 <tr>
 351 <td><p><a name="ALPHA-METHOD-GREEN:CAPS"></a><span class="term"><code class="literal">ALPHA_METHOD_GREEN</code></span></p></td>
 352 <td>Chroma Key green
 353 </td>
 354 </tr>
 355 <tr>
 356 <td><p><a name="ALPHA-METHOD-BLUE:CAPS"></a><span class="term"><code class="literal">ALPHA_METHOD_BLUE</code></span></p></td>
 357 <td>Chroma Key blue
 358 </td>
 359 </tr>
 360 <tr>
 361 <td><p><a name="ALPHA-METHOD-CUSTOM:CAPS"></a><span class="term"><code class="literal">ALPHA_METHOD_CUSTOM</code></span></p></td>
 362 <td>Chroma Key on target_r/g/b
 363 </td>
 364 </tr>
 365 </tbody>
 366 </table></div>
 367 </div>
 368 </div>
 369 <div class="refsect1">
 370 <a name="gst-plugins-good-plugins-alpha.property-details"></a><h2>Property Details</h2>
 371 <div class="refsect2">
 372 <a name="GstAlpha--alpha"></a><h3>The <code class="literal">"alpha"</code> property</h3>
 373 <pre class="programlisting">  "alpha"                    <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a>               : Read / Write</pre>
 374 <p>The value for the alpha channel.</p>
 375 <p>Allowed values: [0,1]</p>
 376 <p>Default value: 1</p>
 377 </div>
 378 <hr>
 379 <div class="refsect2">
 380 <a name="GstAlpha--angle"></a><h3>The <code class="literal">"angle"</code> property</h3>
 381 <pre class="programlisting">  "angle"                    <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a>                : Read / Write</pre>
 382 <p>Size of the colorcube to change.</p>
 383 <p>Allowed values: [0,90]</p>
 384 <p>Default value: 20</p>
 385 </div>
 386 <hr>
 387 <div class="refsect2">
 388 <a name="GstAlpha--method"></a><h3>The <code class="literal">"method"</code> property</h3>
 389 <pre class="programlisting">  "method"                   <a class="link" href="gst-plugins-good-plugins-alpha.html#GstAlphaMethod" title="enum GstAlphaMethod"><span class="type">GstAlphaMethod</span></a>        : Read / Write</pre>
 390 <p>How the alpha channels should be created.</p>
 391 <p>Default value: Set/adjust alpha channel</p>
 392 </div>
 393 <hr>
 394 <div class="refsect2">
 395 <a name="GstAlpha--noise-level"></a><h3>The <code class="literal">"noise-level"</code> property</h3>
 396 <pre class="programlisting">  "noise-level"              <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a>                : Read / Write</pre>
 397 <p>Size of noise radius.</p>
 398 <p>Allowed values: [0,64]</p>
 399 <p>Default value: 2</p>
 400 </div>
 401 <hr>
 402 <div class="refsect2">
 403 <a name="GstAlpha--target-b"></a><h3>The <code class="literal">"target-b"</code> property</h3>
 404 <pre class="programlisting">  "target-b"                 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a>                 : Read / Write</pre>
 405 <p>The Blue target.</p>
 406 <p>Allowed values: &lt;= 255</p>
 407 <p>Default value: 0</p>
 408 </div>
 409 <hr>
 410 <div class="refsect2">
 411 <a name="GstAlpha--target-g"></a><h3>The <code class="literal">"target-g"</code> property</h3>
 412 <pre class="programlisting">  "target-g"                 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a>                 : Read / Write</pre>
 413 <p>The Green target.</p>
 414 <p>Allowed values: &lt;= 255</p>
 415 <p>Default value: 255</p>
 416 </div>
 417 <hr>
 418 <div class="refsect2">
 419 <a name="GstAlpha--target-r"></a><h3>The <code class="literal">"target-r"</code> property</h3>
 420 <pre class="programlisting">  "target-r"                 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a>                 : Read / Write</pre>
 421 <p>The Red target.</p>
 422 <p>Allowed values: &lt;= 255</p>
 423 <p>Default value: 0</p>
 424 </div>
 425 <hr>
 426 <div class="refsect2">
 427 <a name="GstAlpha--black-sensitivity"></a><h3>The <code class="literal">"black-sensitivity"</code> property</h3>
 428 <pre class="programlisting">  "black-sensitivity"        <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a>                 : Read / Write</pre>
 429 <p>Sensitivity to dark colors.</p>
 430 <p>Allowed values: &lt;= 128</p>
 431 <p>Default value: 100</p>
 432 </div>
 433 <hr>
 434 <div class="refsect2">
 435 <a name="GstAlpha--white-sensitivity"></a><h3>The <code class="literal">"white-sensitivity"</code> property</h3>
 436 <pre class="programlisting">  "white-sensitivity"        <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a>                 : Read / Write</pre>
 437 <p>Sensitivity to bright colors.</p>
 438 <p>Allowed values: &lt;= 128</p>
 439 <p>Default value: 100</p>
 440 </div>
 441 <hr>
 442 <div class="refsect2">
 443 <a name="GstAlpha--prefer-passthrough"></a><h3>The <code class="literal">"prefer-passthrough"</code> property</h3>
 444 <pre class="programlisting">  "prefer-passthrough"       <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read / Write</pre>
 445 <p>Don't do any processing for alpha=1.0 if possible.</p>
 446 <p>Default value: FALSE</p>
 447 </div>
 448 </div>
 449 </div>
 450 <div class="footer">
 451 <hr>
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