docs/gst/html/gstreamer-GstDeviceProvider.html - mtk-gstreamer-debian - Git at Google

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 <a name="gstreamer-GstDeviceProvider"></a><div class="titlepage"></div>
 <div class="refnamediv"><table width="100%"><tr>
 <td valign="top">
 <h2><span class="refentrytitle"><a name="gstreamer-GstDeviceProvider.top_of_page"></a>GstDeviceProvider</span></h2>
 <p>GstDeviceProvider — A device provider</p>
 </td>
 <td class="gallery_image" valign="top" align="right"></td>
 </tr></table></div>
 <div class="refsect1">
 <a name="gstreamer-GstDeviceProvider.functions"></a><h2>Functions</h2>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="functions_return">
 <col class="functions_name">
 </colgroup>
 <tbody>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-can-monitor" title="gst_device_provider_can_monitor ()">gst_device_provider_can_monitor</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-class-add-metadata" title="gst_device_provider_class_add_metadata ()">gst_device_provider_class_add_metadata</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-class-add-static-metadata" title="gst_device_provider_class_add_static_metadata ()">gst_device_provider_class_add_static_metadata</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-class-get-metadata" title="gst_device_provider_class_get_metadata ()">gst_device_provider_class_get_metadata</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-class-set-metadata" title="gst_device_provider_class_set_metadata ()">gst_device_provider_class_set_metadata</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-class-set-static-metadata" title="gst_device_provider_class_set_static_metadata ()">gst_device_provider_class_set_static_metadata</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-device-add" title="gst_device_provider_device_add ()">gst_device_provider_device_add</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-device-remove" title="gst_device_provider_device_remove ()">gst_device_provider_device_remove</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstBus.html" title="GstBus"><span class="returnvalue">GstBus</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-get-bus" title="gst_device_provider_get_bus ()">gst_device_provider_get_bus</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-get-devices" title="gst_device_provider_get_devices ()">gst_device_provider_get_devices</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstDeviceProviderFactory.html" title="GstDeviceProviderFactory"><span class="returnvalue">GstDeviceProviderFactory</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-get-factory" title="gst_device_provider_get_factory ()">gst_device_provider_get_factory</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-register" title="gst_device_provider_register ()">gst_device_provider_register</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-start" title="gst_device_provider_start ()">gst_device_provider_start</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-stop" title="gst_device_provider_stop ()">gst_device_provider_stop</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect1">
 <a name="gstreamer-GstDeviceProvider.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="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider">GstDeviceProvider</a></td>
 </tr>
 <tr>
 <td class="datatype_keyword">struct</td>
 <td class="function_name"><a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProviderClass" title="struct GstDeviceProviderClass">GstDeviceProviderClass</a></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect1">
 <a name="gstreamer-GstDeviceProvider.includes"></a><h2>Includes</h2>
 <pre class="synopsis">#include &lt;gst/gst.h&gt;
 </pre>
 </div>
 <div class="refsect1">
 <a name="gstreamer-GstDeviceProvider.description"></a><h2>Description</h2>
 <p>A <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> subclass is provided by a plugin that handles devices
 if there is a way to programatically list connected devices. It can also
 optionally provide updates to the list of connected devices.</p>
 <p>Each <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> subclass is a singleton, a plugin should
 normally provide a single subclass for all devices.</p>
 <p>Applications would normally use a <a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a> to monitor devices
 from all relevant providers.</p>
 </div>
 <div class="refsect1">
 <a name="gstreamer-GstDeviceProvider.functions_details"></a><h2>Functions</h2>
 <div class="refsect2">
 <a name="gst-device-provider-can-monitor"></a><h3>gst_device_provider_can_monitor ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_device_provider_can_monitor (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> *provider</code></em>);</pre>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-device-provider-class-add-metadata"></a><h3>gst_device_provider_class_add_metadata ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_device_provider_class_add_metadata
                                (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProviderClass" title="struct GstDeviceProviderClass"><span class="type">GstDeviceProviderClass</span></a> *klass</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *key</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *value</code></em>);</pre>
 <p>Set <em class="parameter"><code>key</code></em>
  with <em class="parameter"><code>value</code></em>
  as metadata in <em class="parameter"><code>klass</code></em>
 .</p>
 <div class="refsect3">
 <a name="gst-device-provider-class-add-metadata.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" 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>klass</p></td>
 <td class="parameter_description"><p>class to set metadata for</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>key</p></td>
 <td class="parameter_description"><p>the key to set</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>value</p></td>
 <td class="parameter_description"><p>the value to set</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-device-provider-class-add-static-metadata"></a><h3>gst_device_provider_class_add_static_metadata ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_device_provider_class_add_static_metadata
                                (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProviderClass" title="struct GstDeviceProviderClass"><span class="type">GstDeviceProviderClass</span></a> *klass</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *key</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *value</code></em>);</pre>
 <p>Set <em class="parameter"><code>key</code></em>
  with <em class="parameter"><code>value</code></em>
  as metadata in <em class="parameter"><code>klass</code></em>
 .</p>
 <p>Same as <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-class-add-metadata" title="gst_device_provider_class_add_metadata ()"><code class="function">gst_device_provider_class_add_metadata()</code></a>, but <em class="parameter"><code>value</code></em>
  must be a static string
 or an inlined string, as it will not be copied. (GStreamer plugins will
 be made resident once loaded, so this function can be used even from
 dynamically loaded plugins.)</p>
 <div class="refsect3">
 <a name="gst-device-provider-class-add-static-metadata.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" 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>klass</p></td>
 <td class="parameter_description"><p>class to set metadata for</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>key</p></td>
 <td class="parameter_description"><p>the key to set</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>value</p></td>
 <td class="parameter_description"><p> the value to set. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-device-provider-class-get-metadata"></a><h3>gst_device_provider_class_get_metadata ()</h3>
 <pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
 gst_device_provider_class_get_metadata
                                (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProviderClass" title="struct GstDeviceProviderClass"><span class="type">GstDeviceProviderClass</span></a> *klass</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *key</code></em>);</pre>
 <p>Get metadata with <em class="parameter"><code>key</code></em>
  in <em class="parameter"><code>klass</code></em>
 .</p>
 <div class="refsect3">
 <a name="gst-device-provider-class-get-metadata.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" 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>klass</p></td>
 <td class="parameter_description"><p>class to get metadata for</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>key</p></td>
 <td class="parameter_description"><p>the key to get</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-device-provider-class-get-metadata.returns"></a><h4>Returns</h4>
 <p> the metadata for <em class="parameter"><code>key</code></em>
 .</p>
 </div>
 <p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-device-provider-class-set-metadata"></a><h3>gst_device_provider_class_set_metadata ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_device_provider_class_set_metadata
                                (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProviderClass" title="struct GstDeviceProviderClass"><span class="type">GstDeviceProviderClass</span></a> *klass</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *longname</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *classification</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *description</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *author</code></em>);</pre>
 <p>Sets the detailed information for a <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProviderClass" title="struct GstDeviceProviderClass"><span class="type">GstDeviceProviderClass</span></a>.</p>
 <div class="note">This function is for use in _class_init functions only.</div>
 <div class="refsect3">
 <a name="gst-device-provider-class-set-metadata.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" 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>klass</p></td>
 <td class="parameter_description"><p>class to set metadata for</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>longname</p></td>
 <td class="parameter_description"><p>The long English name of the device provider. E.g. "File Sink"</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>classification</p></td>
 <td class="parameter_description"><p>String describing the type of device provider, as an
 unordered list separated with slashes ('/'). See draft-klass.txt of the
 design docs
 for more details and common types. E.g: "Sink/File"</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>description</p></td>
 <td class="parameter_description"><p>Sentence describing the purpose of the device provider.
 E.g: "Write stream to a file"</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>author</p></td>
 <td class="parameter_description"><p>Name and contact details of the author(s). Use \n to separate
 multiple author metadata. E.g: "Joe Bloggs &lt;joe.blogs at foo.com&gt;"</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-device-provider-class-set-static-metadata"></a><h3>gst_device_provider_class_set_static_metadata ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_device_provider_class_set_static_metadata
                                (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProviderClass" title="struct GstDeviceProviderClass"><span class="type">GstDeviceProviderClass</span></a> *klass</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *longname</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *classification</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *description</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *author</code></em>);</pre>
 <p>Sets the detailed information for a <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProviderClass" title="struct GstDeviceProviderClass"><span class="type">GstDeviceProviderClass</span></a>.</p>
 <div class="note">This function is for use in _class_init functions only.</div>
 <p>Same as <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-class-set-metadata" title="gst_device_provider_class_set_metadata ()"><code class="function">gst_device_provider_class_set_metadata()</code></a>, but <em class="parameter"><code>longname</code></em>
 , <em class="parameter"><code>classification</code></em>
 ,
 <em class="parameter"><code>description</code></em>
 , and <em class="parameter"><code>author</code></em>
  must be static strings or inlined strings, as
 they will not be copied. (GStreamer plugins will be made resident once
 loaded, so this function can be used even from dynamically loaded plugins.)</p>
 <div class="refsect3">
 <a name="gst-device-provider-class-set-static-metadata.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" 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>klass</p></td>
 <td class="parameter_description"><p>class to set metadata for</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>longname</p></td>
 <td class="parameter_description"><p> The long English name of the element. E.g. "File Sink". </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>classification</p></td>
 <td class="parameter_description"><p> String describing the type of element, as
 an unordered list separated with slashes ('/'). See draft-klass.txt of the
 design docs for more details and common types. E.g: "Sink/File". </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>description</p></td>
 <td class="parameter_description"><p> Sentence describing the purpose of the
 element.  E.g: "Write stream to a file". </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>author</p></td>
 <td class="parameter_description"><p> Name and contact details of the author(s). Use \n
 to separate multiple author metadata. E.g: "Joe Bloggs &lt;joe.blogs at
 foo.com&gt;". </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-device-provider-device-add"></a><h3>gst_device_provider_device_add ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_device_provider_device_add (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> *provider</code></em>,
                                 <em class="parameter"><code><a class="link" href="gstreamer-GstDevice.html#GstDevice" title="struct GstDevice"><span class="type">GstDevice</span></a> *device</code></em>);</pre>
 <p>Posts a message on the provider's <a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a> to inform applications that
 a new device has been added.</p>
 <p>This is for use by subclasses.</p>
 <div class="refsect3">
 <a name="gst-device-provider-device-add.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" 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>provider</p></td>
 <td class="parameter_description"><p>a <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>device</p></td>
 <td class="parameter_description"><p> a <a class="link" href="gstreamer-GstDevice.html#GstDevice" title="struct GstDevice"><span class="type">GstDevice</span></a> that has been added. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-device-provider-device-remove"></a><h3>gst_device_provider_device_remove ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_device_provider_device_remove (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> *provider</code></em>,
                                    <em class="parameter"><code><a class="link" href="gstreamer-GstDevice.html#GstDevice" title="struct GstDevice"><span class="type">GstDevice</span></a> *device</code></em>);</pre>
 <p>Posts a message on the provider's <a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a> to inform applications that
 a device has been removed.</p>
 <p>This is for use by subclasses.</p>
 <div class="refsect3">
 <a name="gst-device-provider-device-remove.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" 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>provider</p></td>
 <td class="parameter_description"><p>a <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>device</p></td>
 <td class="parameter_description"><p>a <a class="link" href="gstreamer-GstDevice.html#GstDevice" title="struct GstDevice"><span class="type">GstDevice</span></a> that has been removed</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-device-provider-get-bus"></a><h3>gst_device_provider_get_bus ()</h3>
 <pre class="programlisting"><a class="link" href="GstBus.html" title="GstBus"><span class="returnvalue">GstBus</span></a> *
 gst_device_provider_get_bus (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> *provider</code></em>);</pre>
 <p>Gets the <a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a> of this <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a></p>
 <div class="refsect3">
 <a name="gst-device-provider-get-bus.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" 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>provider</p></td>
 <td class="parameter_description"><p>a <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-device-provider-get-bus.returns"></a><h4>Returns</h4>
 <p> a <a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a>. </p>
 <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
 </div>
 <p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-device-provider-get-devices"></a><h3>gst_device_provider_get_devices ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> *
 gst_device_provider_get_devices (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> *provider</code></em>);</pre>
 <p>Gets a list of devices that this provider understands. This may actually
 probe the hardware if the provider is not currently started.</p>
 <div class="refsect3">
 <a name="gst-device-provider-get-devices.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" 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>provider</p></td>
 <td class="parameter_description"><p>A <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-device-provider-get-devices.returns"></a><h4>Returns</h4>
 <p> a <a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> of
 <a class="link" href="gstreamer-GstDevice.html#GstDevice" title="struct GstDevice"><span class="type">GstDevice</span></a>. </p>
 <p><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> GstDevice]</span></p>
 </div>
 <p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-device-provider-get-factory"></a><h3>gst_device_provider_get_factory ()</h3>
 <pre class="programlisting"><a class="link" href="GstDeviceProviderFactory.html" title="GstDeviceProviderFactory"><span class="returnvalue">GstDeviceProviderFactory</span></a> *
 gst_device_provider_get_factory (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> *provider</code></em>);</pre>
 <p>Retrieves the factory that was used to create this device provider.</p>
 <div class="refsect3">
 <a name="gst-device-provider-get-factory.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" 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>provider</p></td>
 <td class="parameter_description"><p>a <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> to request the device provider factory of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-device-provider-get-factory.returns"></a><h4>Returns</h4>
 <p> the <a class="link" href="GstDeviceProviderFactory.html" title="GstDeviceProviderFactory"><span class="type">GstDeviceProviderFactory</span></a> used for
 creating this device provider. no refcounting is needed. </p>
 <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
 </div>
 <p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-device-provider-register"></a><h3>gst_device_provider_register ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_device_provider_register (<em class="parameter"><code><a class="link" href="GstPlugin.html" title="GstPlugin"><span class="type">GstPlugin</span></a> *plugin</code></em>,
                               <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                               <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> rank</code></em>,
                               <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobjectgobject-Type-Information.html#GType"><span class="type">GType</span></a> type</code></em>);</pre>
 <p>Create a new device providerfactory capable of instantiating objects of the
 <em class="parameter"><code>type</code></em>
  and add the factory to <em class="parameter"><code>plugin</code></em>
 .</p>
 <div class="refsect3">
 <a name="gst-device-provider-register.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" 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>plugin</p></td>
 <td class="parameter_description"><p> <a class="link" href="GstPlugin.html" title="GstPlugin"><span class="type">GstPlugin</span></a> to register the device provider with, or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> for
 a static device provider. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>name</p></td>
 <td class="parameter_description"><p>name of device providers of this type</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>rank</p></td>
 <td class="parameter_description"><p>rank of device provider (higher rank means more importance when autoplugging)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>type</p></td>
 <td class="parameter_description"><p>GType of device provider to register</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-device-provider-register.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, if the registering succeeded, <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> on error</p>
 </div>
 <p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-device-provider-start"></a><h3>gst_device_provider_start ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_device_provider_start (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> *provider</code></em>);</pre>
 <p>Starts providering the devices. This will cause <a class="link" href="GstMessage.html#GST-MESSAGE-DEVICE-ADDED:CAPS"><span class="type">GST_MESSAGE_DEVICE_ADDED</span></a>
 and <a class="link" href="GstMessage.html#GST-MESSAGE-DEVICE-REMOVED:CAPS"><span class="type">GST_MESSAGE_DEVICE_REMOVED</span></a> messages to be posted on the provider's bus
 when devices are added or removed from the system.</p>
 <p>Since the <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> is a singleton,
 <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-start" title="gst_device_provider_start ()"><code class="function">gst_device_provider_start()</code></a> may already have been called by another
 user of the object, <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-stop" title="gst_device_provider_stop ()"><code class="function">gst_device_provider_stop()</code></a> needs to be called the same
 number of times.</p>
 <div class="refsect3">
 <a name="gst-device-provider-start.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" 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>provider</p></td>
 <td class="parameter_description"><p>A <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-device-provider-start.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the device providering could be started</p>
 </div>
 <p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-device-provider-stop"></a><h3>gst_device_provider_stop ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_device_provider_stop (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> *provider</code></em>);</pre>
 <p>Decreases the use-count by one. If the use count reaches zero, this
 <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> will stop providering the devices. This needs to be
 called the same number of times that <a class="link" href="gstreamer-GstDeviceProvider.html#gst-device-provider-start" title="gst_device_provider_start ()"><code class="function">gst_device_provider_start()</code></a> was called.</p>
 <div class="refsect3">
 <a name="gst-device-provider-stop.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" 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>provider</p></td>
 <td class="parameter_description"><p>A <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
 </div>
 </div>
 <div class="refsect1">
 <a name="gstreamer-GstDeviceProvider.other_details"></a><h2>Types and Values</h2>
 <div class="refsect2">
 <a name="GstDeviceProvider"></a><h3>struct GstDeviceProvider</h3>
 <pre class="programlisting">struct GstDeviceProvider {
   GstObject         parent;

   /* Protected by the Object lock */
   GList *devices;
 };
 </pre>
 <p>The structure of the base <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a></p>
 <div class="refsect3">
 <a name="GstDeviceProvider.members"></a><h4>Members</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="300px" class="struct_members_name">
 <col class="struct_members_description">
 <col width="200px" class="struct_members_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> <em class="structfield"><code><a name="GstDeviceProvider.parent"></a>parent</code></em>;</p></td>
 <td class="struct_member_description"><p>The parent <a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a></p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> *<em class="structfield"><code><a name="GstDeviceProvider.devices"></a>devices</code></em>;</p></td>
 <td class="struct_member_description"><p>a <a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> of the <a class="link" href="gstreamer-GstDevice.html#GstDevice" title="struct GstDevice"><span class="type">GstDevice</span></a> objects</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GstDeviceProviderClass"></a><h3>struct GstDeviceProviderClass</h3>
 <pre class="programlisting">struct GstDeviceProviderClass {
   GstObjectClass    parent_class;

   GstDeviceProviderFactory     *factory;

   GList*      (*probe) (GstDeviceProvider * provider);

   gboolean    (*start) (GstDeviceProvider * provider);
   void        (*stop)  (GstDeviceProvider * provider);
 };
 </pre>
 <p>The structure of the base <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProviderClass" title="struct GstDeviceProviderClass"><span class="type">GstDeviceProviderClass</span></a></p>
 <div class="refsect3">
 <a name="GstDeviceProviderClass.members"></a><h4>Members</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="300px" class="struct_members_name">
 <col class="struct_members_description">
 <col width="200px" class="struct_members_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="GstDeviceProviderFactory.html" title="GstDeviceProviderFactory"><span class="type">GstDeviceProviderFactory</span></a> *<em class="structfield"><code><a name="GstDeviceProviderClass.factory"></a>factory</code></em>;</p></td>
 <td class="struct_member_description"><p>a pointer to the <a class="link" href="GstDeviceProviderFactory.html" title="GstDeviceProviderFactory"><span class="type">GstDeviceProviderFactory</span></a> that creates this
 provider</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GstDeviceProviderClass.probe"></a>probe</code></em> ()</p></td>
 <td class="struct_member_description"><p>Returns a list of devices that are currently available.
 This should never block.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GstDeviceProviderClass.start"></a>start</code></em> ()</p></td>
 <td class="struct_member_description"><p>Starts monitoring for new devices. Only subclasses that can know
 that devices have been added or remove need to implement this method.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GstDeviceProviderClass.stop"></a>stop</code></em> ()</p></td>
 <td class="struct_member_description"><p>Stops monitoring for new devices. Only subclasses that implement
 the <code class="function">start()</code> method need to implement this method.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
 </div>
 </div>
 <div class="refsect1">
 <a name="gstreamer-GstDeviceProvider.see-also"></a><h2>See Also</h2>
 <p><a class="link" href="gstreamer-GstDevice.html#GstDevice" title="struct GstDevice"><span class="type">GstDevice</span></a>, <a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a></p>
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