mobile/docs/gst/html/GstPluginFeature.html

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  24 <a href="#GstPluginFeature.synopsis" class="shortcut">Top</a>
  25                    |
  26                   <a href="#GstPluginFeature.description" class="shortcut">Description</a>
  27                    |
  28                   <a href="#GstPluginFeature.object-hierarchy" class="shortcut">Object Hierarchy</a>
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  31 <div class="refentry">
  32 <a name="GstPluginFeature"></a><div class="titlepage"></div>
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  35 <h2><span class="refentrytitle"><a name="GstPluginFeature.top_of_page"></a>GstPluginFeature</span></h2>
  36 <p>GstPluginFeature — Base class for contents of a GstPlugin</p>
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  40 <div class="refsynopsisdiv">
  41 <a name="GstPluginFeature.synopsis"></a><h2>Synopsis</h2>
  42 <pre class="synopsis">
  43 #include &lt;gst/gst.h&gt;
  44
  45 struct              <a class="link" href="GstPluginFeature.html#GstPluginFeature-struct" title="struct GstPluginFeature">GstPluginFeature</a>;
  46 #define             <a class="link" href="GstPluginFeature.html#GST-PLUGIN-FEATURE-NAME:CAPS" title="GST_PLUGIN_FEATURE_NAME()">GST_PLUGIN_FEATURE_NAME</a>             (feature)
  47                     <a class="link" href="GstPluginFeature.html#GstTypeNameData" title="GstTypeNameData">GstTypeNameData</a>;
  48 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            (<a class="link" href="GstPluginFeature.html#GstPluginFeatureFilter" title="GstPluginFeatureFilter ()">*GstPluginFeatureFilter</a>)           (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>,
  49                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
  50 enum                <a class="link" href="GstPluginFeature.html#GstRank" title="enum GstRank">GstRank</a>;
  51 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="GstPluginFeature.html#gst-plugin-feature-type-name-filter" title="gst_plugin_feature_type_name_filter ()">gst_plugin_feature_type_name_filter</a> (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>,
  52                                                          <em class="parameter"><code><a class="link" href="GstPluginFeature.html#GstTypeNameData" title="GstTypeNameData"><span class="type">GstTypeNameData</span></a> *data</code></em>);
  53 <span class="returnvalue">void</span>                <a class="link" href="GstPluginFeature.html#gst-plugin-feature-set-rank" title="gst_plugin_feature_set_rank ()">gst_plugin_feature_set_rank</a>         (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>,
  54                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> rank</code></em>);
  55 <span class="returnvalue">void</span>                <a class="link" href="GstPluginFeature.html#gst-plugin-feature-set-name" title="gst_plugin_feature_set_name ()">gst_plugin_feature_set_name</a>         (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>,
  56                                                          <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);
  57 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               <a class="link" href="GstPluginFeature.html#gst-plugin-feature-get-rank" title="gst_plugin_feature_get_rank ()">gst_plugin_feature_get_rank</a>         (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>);
  58 const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *       <a class="link" href="GstPluginFeature.html#gst-plugin-feature-get-name" title="gst_plugin_feature_get_name ()">gst_plugin_feature_get_name</a>         (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>);
  59 <a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="returnvalue">GstPluginFeature</span></a> *  <a class="link" href="GstPluginFeature.html#gst-plugin-feature-load" title="gst_plugin_feature_load ()">gst_plugin_feature_load</a>             (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>);
  60 <a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> *             <a class="link" href="GstPluginFeature.html#gst-plugin-feature-list-copy" title="gst_plugin_feature_list_copy ()">gst_plugin_feature_list_copy</a>        (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> *list</code></em>);
  61 <span class="returnvalue">void</span>                <a class="link" href="GstPluginFeature.html#gst-plugin-feature-list-free" title="gst_plugin_feature_list_free ()">gst_plugin_feature_list_free</a>        (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> *list</code></em>);
  62 #define             <a class="link" href="GstPluginFeature.html#GST-PLUGIN-FEATURE-LIST-DEBUG:CAPS" title="GST_PLUGIN_FEATURE_LIST_DEBUG()">GST_PLUGIN_FEATURE_LIST_DEBUG</a>       (list)
  63 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="GstPluginFeature.html#gst-plugin-feature-check-version" title="gst_plugin_feature_check_version ()">gst_plugin_feature_check_version</a>    (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>,
  64                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> min_major</code></em>,
  65                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> min_minor</code></em>,
  66                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> min_micro</code></em>);
  67 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>                <a class="link" href="GstPluginFeature.html#gst-plugin-feature-rank-compare-func" title="gst_plugin_feature_rank_compare_func ()">gst_plugin_feature_rank_compare_func</a>
  68                                                         (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gconstpointer"><span class="type">gconstpointer</span></a> p1</code></em>,
  69                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gconstpointer"><span class="type">gconstpointer</span></a> p2</code></em>);
  70 </pre>
  71 </div>
  72 <div class="refsect1">
  73 <a name="GstPluginFeature.object-hierarchy"></a><h2>Object Hierarchy</h2>
  74 <pre class="synopsis">
  75   <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
  76    +----<a class="link" href="GstObject.html" title="GstObject">GstObject</a>
  77          +----GstPluginFeature
  78                +----<a class="link" href="GstElementFactory.html" title="GstElementFactory">GstElementFactory</a>
  79                +----<a class="link" href="GstTypeFindFactory.html" title="GstTypeFindFactory">GstTypeFindFactory</a>
  80                +----<a class="link" href="GstIndexFactory.html" title="GstIndexFactory">GstIndexFactory</a>
  81 </pre>
  82 </div>
  83 <div class="refsect1">
  84 <a name="GstPluginFeature.description"></a><h2>Description</h2>
  85 <p>
  86 This is a base class for anything that can be added to a <a class="link" href="GstPlugin.html" title="GstPlugin"><span class="type">GstPlugin</span></a>.
  87 </p>
  88 </div>
  89 <div class="refsect1">
  90 <a name="GstPluginFeature.details"></a><h2>Details</h2>
  91 <div class="refsect2">
  92 <a name="GstPluginFeature-struct"></a><h3>struct GstPluginFeature</h3>
  93 <pre class="programlisting">struct GstPluginFeature;</pre>
  94 <p>
  95 Opaque <a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> structure.
  96 </p>
  97 </div>
  98 <hr>
  99 <div class="refsect2">
 100 <a name="GST-PLUGIN-FEATURE-NAME:CAPS"></a><h3>GST_PLUGIN_FEATURE_NAME()</h3>
 101 <pre class="programlisting">#define GST_PLUGIN_FEATURE_NAME(feature)  (GST_PLUGIN_FEATURE (feature)-&gt;name)
 102 </pre>
 103 <p>
 104 Get the name of the feature
 105 </p>
 106 <div class="variablelist"><table border="0">
 107 <col align="left" valign="top">
 108 <tbody><tr>
 109 <td><p><span class="term"><em class="parameter"><code>feature</code></em> :</span></p></td>
 110 <td>The feature to query</td>
 111 </tr></tbody>
 112 </table></div>
 113 </div>
 114 <hr>
 115 <div class="refsect2">
 116 <a name="GstTypeNameData"></a><h3>GstTypeNameData</h3>
 117 <pre class="programlisting">typedef struct {
 118   const gchar   *name;
 119   GType          type;
 120 } GstTypeNameData;
 121 </pre>
 122 <div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;">
 123 <h3 class="title">Warning</h3>
 124 <p><code class="literal">GstTypeNameData</code> is deprecated and should not be used in newly-written code.</p>
 125 </div>
 126 <p>
 127 Structure used for filtering based on <em class="parameter"><code>name</code></em> and <em class="parameter"><code>type</code></em>.
 128 </p>
 129 <div class="variablelist"><table border="0">
 130 <col align="left" valign="top">
 131 <tbody>
 132 <tr>
 133 <td><p><span class="term">const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GstTypeNameData.name"></a>name</code></em>;</span></p></td>
 134 <td>a name</td>
 135 </tr>
 136 <tr>
 137 <td><p><span class="term"><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GType"><span class="type">GType</span></a> <em class="structfield"><code><a name="GstTypeNameData.type"></a>type</code></em>;</span></p></td>
 138 <td>a GType</td>
 139 </tr>
 140 </tbody>
 141 </table></div>
 142 </div>
 143 <hr>
 144 <div class="refsect2">
 145 <a name="GstPluginFeatureFilter"></a><h3>GstPluginFeatureFilter ()</h3>
 146 <pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            (*GstPluginFeatureFilter)           (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>,
 147                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
 148 <p>
 149 A function that can be used with e.g. <a class="link" href="GstRegistry.html#gst-registry-feature-filter" title="gst_registry_feature_filter ()"><code class="function">gst_registry_feature_filter()</code></a>
 150 to get a list of pluginfeature that match certain criteria.
 151 </p>
 152 <div class="variablelist"><table border="0">
 153 <col align="left" valign="top">
 154 <tbody>
 155 <tr>
 156 <td><p><span class="term"><em class="parameter"><code>feature</code></em> :</span></p></td>
 157 <td>the pluginfeature to check</td>
 158 </tr>
 159 <tr>
 160 <td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
 161 <td>the user_data that has been passed on e.g.
 162 <a class="link" href="GstRegistry.html#gst-registry-feature-filter" title="gst_registry_feature_filter ()"><code class="function">gst_registry_feature_filter()</code></a>
 163 </td>
 164 </tr>
 165 <tr>
 166 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 167 <td>
 168 <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> for a positive match, <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise</td>
 169 </tr>
 170 </tbody>
 171 </table></div>
 172 </div>
 173 <hr>
 174 <div class="refsect2">
 175 <a name="GstRank"></a><h3>enum GstRank</h3>
 176 <pre class="programlisting">typedef enum {
 177   GST_RANK_NONE                 = 0,
 178   GST_RANK_MARGINAL             = 64,
 179   GST_RANK_SECONDARY            = 128,
 180   GST_RANK_PRIMARY              = 256
 181 } GstRank;
 182 </pre>
 183 <p>
 184 Element priority ranks. Defines the order in which the autoplugger (or
 185 similar rank-picking mechanisms, such as e.g. <a class="link" href="gstreamer-GstUriHandler.html#gst-element-make-from-uri" title="gst_element_make_from_uri ()"><code class="function">gst_element_make_from_uri()</code></a>)
 186 will choose this element over an alternative one with the same function.
 187 </p>
 188 <p>
 189 These constants serve as a rough guidance for defining the rank of a
 190 <a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a>. Any value is valid, including values bigger than
 191 <em class="parameter"><code>GST_RANK_PRIMARY</code></em>.
 192 </p>
 193 <div class="variablelist"><table border="0">
 194 <col align="left" valign="top">
 195 <tbody>
 196 <tr>
 197 <td><p><a name="GST-RANK-NONE:CAPS"></a><span class="term"><code class="literal">GST_RANK_NONE</code></span></p></td>
 198 <td>will be chosen last or not at all
 199 </td>
 200 </tr>
 201 <tr>
 202 <td><p><a name="GST-RANK-MARGINAL:CAPS"></a><span class="term"><code class="literal">GST_RANK_MARGINAL</code></span></p></td>
 203 <td>unlikely to be chosen
 204 </td>
 205 </tr>
 206 <tr>
 207 <td><p><a name="GST-RANK-SECONDARY:CAPS"></a><span class="term"><code class="literal">GST_RANK_SECONDARY</code></span></p></td>
 208 <td>likely to be chosen
 209 </td>
 210 </tr>
 211 <tr>
 212 <td><p><a name="GST-RANK-PRIMARY:CAPS"></a><span class="term"><code class="literal">GST_RANK_PRIMARY</code></span></p></td>
 213 <td>will be chosen first
 214 </td>
 215 </tr>
 216 </tbody>
 217 </table></div>
 218 </div>
 219 <hr>
 220 <div class="refsect2">
 221 <a name="gst-plugin-feature-type-name-filter"></a><h3>gst_plugin_feature_type_name_filter ()</h3>
 222 <pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gst_plugin_feature_type_name_filter (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>,
 223                                                          <em class="parameter"><code><a class="link" href="GstPluginFeature.html#GstTypeNameData" title="GstTypeNameData"><span class="type">GstTypeNameData</span></a> *data</code></em>);</pre>
 224 <div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;">
 225 <h3 class="title">Warning</h3>
 226 <p><code class="literal">gst_plugin_feature_type_name_filter</code> is deprecated and should not be used in newly-written code.</p>
 227 </div>
 228 <p>
 229 Compares type and name of plugin feature. Can be used with <a class="link" href="gstreamer-GstFilter.html#gst-filter-run" title="gst_filter_run ()"><code class="function">gst_filter_run()</code></a>.
 230 </p>
 231 <div class="variablelist"><table border="0">
 232 <col align="left" valign="top">
 233 <tbody>
 234 <tr>
 235 <td><p><span class="term"><em class="parameter"><code>feature</code></em> :</span></p></td>
 236 <td>the <a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a>
 237 </td>
 238 </tr>
 239 <tr>
 240 <td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
 241 <td>the type and name to check against. <span class="annotation">[<acronym title="Parameter for input. Default is transfer none."><span class="acronym">in</span></acronym>]</span>
 242 </td>
 243 </tr>
 244 <tr>
 245 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 246 <td>TRUE if equal.</td>
 247 </tr>
 248 </tbody>
 249 </table></div>
 250 </div>
 251 <hr>
 252 <div class="refsect2">
 253 <a name="gst-plugin-feature-set-rank"></a><h3>gst_plugin_feature_set_rank ()</h3>
 254 <pre class="programlisting"><span class="returnvalue">void</span>                gst_plugin_feature_set_rank         (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>,
 255                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> rank</code></em>);</pre>
 256 <p>
 257 Specifies a rank for a plugin feature, so that autoplugging uses
 258 the most appropriate feature.
 259 </p>
 260 <div class="variablelist"><table border="0">
 261 <col align="left" valign="top">
 262 <tbody>
 263 <tr>
 264 <td><p><span class="term"><em class="parameter"><code>feature</code></em> :</span></p></td>
 265 <td>feature to rank</td>
 266 </tr>
 267 <tr>
 268 <td><p><span class="term"><em class="parameter"><code>rank</code></em> :</span></p></td>
 269 <td>rank value - higher number means more priority rank</td>
 270 </tr>
 271 </tbody>
 272 </table></div>
 273 </div>
 274 <hr>
 275 <div class="refsect2">
 276 <a name="gst-plugin-feature-set-name"></a><h3>gst_plugin_feature_set_name ()</h3>
 277 <pre class="programlisting"><span class="returnvalue">void</span>                gst_plugin_feature_set_name         (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>,
 278                                                          <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);</pre>
 279 <p>
 280 Sets the name of a plugin feature. The name uniquely identifies a feature
 281 within all features of the same type. Renaming a plugin feature is not
 282 allowed. A copy is made of the name so you should free the supplied <em class="parameter"><code>name</code></em>
 283 after calling this function.
 284 </p>
 285 <div class="variablelist"><table border="0">
 286 <col align="left" valign="top">
 287 <tbody>
 288 <tr>
 289 <td><p><span class="term"><em class="parameter"><code>feature</code></em> :</span></p></td>
 290 <td>a feature</td>
 291 </tr>
 292 <tr>
 293 <td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
 294 <td>the name to set</td>
 295 </tr>
 296 </tbody>
 297 </table></div>
 298 </div>
 299 <hr>
 300 <div class="refsect2">
 301 <a name="gst-plugin-feature-get-rank"></a><h3>gst_plugin_feature_get_rank ()</h3>
 302 <pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               gst_plugin_feature_get_rank         (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>);</pre>
 303 <p>
 304 Gets the rank of a plugin feature.
 305 </p>
 306 <div class="variablelist"><table border="0">
 307 <col align="left" valign="top">
 308 <tbody>
 309 <tr>
 310 <td><p><span class="term"><em class="parameter"><code>feature</code></em> :</span></p></td>
 311 <td>a feature</td>
 312 </tr>
 313 <tr>
 314 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 315 <td>The rank of the feature</td>
 316 </tr>
 317 </tbody>
 318 </table></div>
 319 </div>
 320 <hr>
 321 <div class="refsect2">
 322 <a name="gst-plugin-feature-get-name"></a><h3>gst_plugin_feature_get_name ()</h3>
 323 <pre class="programlisting">const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *       gst_plugin_feature_get_name         (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>);</pre>
 324 <p>
 325 Gets the name of a plugin feature.
 326 </p>
 327 <div class="variablelist"><table border="0">
 328 <col align="left" valign="top">
 329 <tbody>
 330 <tr>
 331 <td><p><span class="term"><em class="parameter"><code>feature</code></em> :</span></p></td>
 332 <td>a feature</td>
 333 </tr>
 334 <tr>
 335 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 336 <td>the name</td>
 337 </tr>
 338 </tbody>
 339 </table></div>
 340 </div>
 341 <hr>
 342 <div class="refsect2">
 343 <a name="gst-plugin-feature-load"></a><h3>gst_plugin_feature_load ()</h3>
 344 <pre class="programlisting"><a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="returnvalue">GstPluginFeature</span></a> *  gst_plugin_feature_load             (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>);</pre>
 345 <p>
 346 Loads the plugin containing <em class="parameter"><code>feature</code></em> if it's not already loaded. <em class="parameter"><code>feature</code></em> is
 347 unaffected; use the return value instead.
 348 </p>
 349 <p>
 350 Normally this function is used like this:
 351 </p>
 352 <div class="informalexample">
 353   <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
 354     <tbody>
 355       <tr>
 356         <td class="listing_lines" align="right"><pre>1
 357 2
 358 3
 359 4
 360 5
 361 6</pre></td>
 362         <td class="listing_code"><pre class="programlisting">GstPluginFeature <span class="gtkdoc opt">*</span>loaded_feature<span class="gtkdoc opt">;</span>
 363
 364 loaded_feature <span class="gtkdoc opt">=</span> <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPluginFeature.html#gst-plugin-feature-load">gst_plugin_feature_load</a></span> <span class="gtkdoc opt">(</span>feature<span class="gtkdoc opt">);</span>
 365 <span class="gtkdoc slc">// presumably, we're no longer interested in the potentially-unloaded feature</span>
 366 <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html#gst-object-unref">gst_object_unref</a></span> <span class="gtkdoc opt">(</span>feature<span class="gtkdoc opt">);</span>
 367 feature <span class="gtkdoc opt">=</span> loaded_feature<span class="gtkdoc opt">;</span></pre></td>
 368       </tr>
 369     </tbody>
 370   </table>
 371 </div>
 372
 373 <p>
 374 </p>
 375 <div class="variablelist"><table border="0">
 376 <col align="left" valign="top">
 377 <tbody>
 378 <tr>
 379 <td><p><span class="term"><em class="parameter"><code>feature</code></em> :</span></p></td>
 380 <td>the plugin feature to check. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
 381 </td>
 382 </tr>
 383 <tr>
 384 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 385 <td>a reference to the loaded feature, or NULL on error. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
 386 </td>
 387 </tr>
 388 </tbody>
 389 </table></div>
 390 </div>
 391 <hr>
 392 <div class="refsect2">
 393 <a name="gst-plugin-feature-list-copy"></a><h3>gst_plugin_feature_list_copy ()</h3>
 394 <pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> *             gst_plugin_feature_list_copy        (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> *list</code></em>);</pre>
 395 <p>
 396 Copies the list of features. Caller should call <em class="parameter"><code>gst_plugin_feature_list_free</code></em>
 397 when done with the list.
 398 </p>
 399 <div class="variablelist"><table border="0">
 400 <col align="left" valign="top">
 401 <tbody>
 402 <tr>
 403 <td><p><span class="term"><em class="parameter"><code>list</code></em> :</span></p></td>
 404 <td>list
 405 of <a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a>. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.PluginFeature]</span>
 406 </td>
 407 </tr>
 408 <tr>
 409 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 410 <td>a copy of <em class="parameter"><code>list</code></em>,
 411 with each feature's reference count incremented. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.PluginFeature]</span>
 412 </td>
 413 </tr>
 414 </tbody>
 415 </table></div>
 416 <p class="since">Since 0.10.26</p>
 417 </div>
 418 <hr>
 419 <div class="refsect2">
 420 <a name="gst-plugin-feature-list-free"></a><h3>gst_plugin_feature_list_free ()</h3>
 421 <pre class="programlisting"><span class="returnvalue">void</span>                gst_plugin_feature_list_free        (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> *list</code></em>);</pre>
 422 <p>
 423 Unrefs each member of <em class="parameter"><code>list</code></em>, then frees the list.
 424 </p>
 425 <div class="variablelist"><table border="0">
 426 <col align="left" valign="top">
 427 <tbody><tr>
 428 <td><p><span class="term"><em class="parameter"><code>list</code></em> :</span></p></td>
 429 <td>list
 430 of <a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a>. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.PluginFeature]</span>
 431 </td>
 432 </tr></tbody>
 433 </table></div>
 434 </div>
 435 <hr>
 436 <div class="refsect2">
 437 <a name="GST-PLUGIN-FEATURE-LIST-DEBUG:CAPS"></a><h3>GST_PLUGIN_FEATURE_LIST_DEBUG()</h3>
 438 <pre class="programlisting">#define GST_PLUGIN_FEATURE_LIST_DEBUG(list) gst_plugin_feature_list_debug(list)
 439 </pre>
 440 <p>
 441 Debug the plugin feature names in <em class="parameter"><code>list</code></em>.
 442 </p>
 443 <div class="variablelist"><table border="0">
 444 <col align="left" valign="top">
 445 <tbody><tr>
 446 <td><p><span class="term"><em class="parameter"><code>list</code></em> :</span></p></td>
 447 <td>a <a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> of
 448 plugin features. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.PluginFeature]</span>
 449 </td>
 450 </tr></tbody>
 451 </table></div>
 452 <p class="since">Since 0.10.31</p>
 453 </div>
 454 <hr>
 455 <div class="refsect2">
 456 <a name="gst-plugin-feature-check-version"></a><h3>gst_plugin_feature_check_version ()</h3>
 457 <pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gst_plugin_feature_check_version    (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>,
 458                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> min_major</code></em>,
 459                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> min_minor</code></em>,
 460                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> min_micro</code></em>);</pre>
 461 <p>
 462 Checks whether the given plugin feature is at least
 463  the required version
 464 </p>
 465 <div class="variablelist"><table border="0">
 466 <col align="left" valign="top">
 467 <tbody>
 468 <tr>
 469 <td><p><span class="term"><em class="parameter"><code>feature</code></em> :</span></p></td>
 470 <td>a feature</td>
 471 </tr>
 472 <tr>
 473 <td><p><span class="term"><em class="parameter"><code>min_major</code></em> :</span></p></td>
 474 <td>minimum required major version</td>
 475 </tr>
 476 <tr>
 477 <td><p><span class="term"><em class="parameter"><code>min_minor</code></em> :</span></p></td>
 478 <td>minimum required minor version</td>
 479 </tr>
 480 <tr>
 481 <td><p><span class="term"><em class="parameter"><code>min_micro</code></em> :</span></p></td>
 482 <td>minimum required micro version</td>
 483 </tr>
 484 <tr>
 485 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 486 <td>
 487 <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><span class="type">TRUE</span></a> if the plugin feature has at least
 488 the required version, otherwise <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><span class="type">FALSE</span></a>.</td>
 489 </tr>
 490 </tbody>
 491 </table></div>
 492 </div>
 493 <hr>
 494 <div class="refsect2">
 495 <a name="gst-plugin-feature-rank-compare-func"></a><h3>gst_plugin_feature_rank_compare_func ()</h3>
 496 <pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>                gst_plugin_feature_rank_compare_func
 497                                                         (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gconstpointer"><span class="type">gconstpointer</span></a> p1</code></em>,
 498                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gconstpointer"><span class="type">gconstpointer</span></a> p2</code></em>);</pre>
 499 <p>
 500 Compares the two given <a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a> instances. This function can be
 501 used as a <a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GCompareFunc"><span class="type">GCompareFunc</span></a> when sorting by rank and then by name.
 502 </p>
 503 <div class="variablelist"><table border="0">
 504 <col align="left" valign="top">
 505 <tbody>
 506 <tr>
 507 <td><p><span class="term"><em class="parameter"><code>p1</code></em> :</span></p></td>
 508 <td>a <a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a>
 509 </td>
 510 </tr>
 511 <tr>
 512 <td><p><span class="term"><em class="parameter"><code>p2</code></em> :</span></p></td>
 513 <td>a <a class="link" href="GstPluginFeature.html" title="GstPluginFeature"><span class="type">GstPluginFeature</span></a>
 514 </td>
 515 </tr>
 516 <tr>
 517 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 518 <td>negative value if the rank of p1 &gt; the rank of p2 or the ranks are
 519 equal but the name of p1 comes before the name of p2; zero if the rank
 520 and names are equal; positive value if the rank of p1 &lt; the rank of p2 or the
 521 ranks are equal but the name of p2 comes after the name of p1</td>
 522 </tr>
 523 </tbody>
 524 </table></div>
 525 <p class="since">Since 0.10.31</p>
 526 </div>
 527 </div>
 528 <div class="refsect1">
 529 <a name="GstPluginFeature.see-also"></a><h2>See Also</h2>
 530 <a class="link" href="GstPlugin.html" title="GstPlugin"><span class="type">GstPlugin</span></a>
 531 </div>
 532 </div>
 533 <div class="footer">
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