mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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366 lines
7.5 KiB
Text
366 lines
7.5 KiB
Text
<!-- ##### SECTION Title ##### -->
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GstPlugin
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<!-- ##### SECTION Short_Description ##### -->
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Container for features loaded from a shared object module
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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GStreamer is extensible, so <classname>GstElements</classname> can be loaded at runtime.
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A plugin system can provide one or more of the basic <application>GStreamer</application>
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#GstPluginFeature subclasses.
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</para>
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<para>
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A plugin should export a symbol <symbol>plugin_desc</symbol> that is a struct of type #GstPluginDesc.
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the plugin loader will check the version of the core library the plugin was linked against
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and will create a new #GstPlugin. It will then call the #GstPluginInitFunc function
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that was provided in the plugin_desc.
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</para>
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<para>
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Once you have a handle to a #GstPlugin (e.g. from the #GstRegistryPool ), you can
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add any object that subclasses #GstPluginFeature.
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</para>
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<para>
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Use gst_plugin_find_feature() and gst_plugin_get_feature_list() to find features in a plugin.
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</para>
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<para>
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Usually plugins are always automaticlly loaded so you don't need to call gst_plugin_load() explicitly
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to bring it into memory. There are options to statically link plugins to an app or even
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use GStreamer without a plugin repository in which case gst_plugin_load() can be needed
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to bring the plugin into memory.
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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#GstPluginFeature, #GstType, #GstAutoplug, #GstElementFactory
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</para>
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<!-- ##### SECTION Stability_Level ##### -->
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<!-- ##### FUNCTION gst_plugin_error_quark ##### -->
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<para>
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Get the error quark
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</para>
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@Returns: The error quark used in GError messages
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<!-- ##### MACRO GST_PLUGIN_ERROR ##### -->
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<para>
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The error quark
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</para>
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<!-- ##### ENUM GstPluginError ##### -->
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<para>
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The plugin loading errors
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</para>
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@GST_PLUGIN_ERROR_MODULE: The plugin could not be loaded
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@GST_PLUGIN_ERROR_DEPENDENCIES: The plugin has unresolved dependencies
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@GST_PLUGIN_ERROR_NAME_MISMATCH: The plugin has already be loaded from a different file
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<!-- ##### STRUCT GstPlugin ##### -->
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<para>
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The plugin object
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</para>
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@desc:
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@filename:
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@features:
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@numfeatures:
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@manager:
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@module:
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@_gst_reserved:
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<!-- ##### STRUCT GstPluginDesc ##### -->
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<para>
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A plugins should export a variable of this type called plugin_desc. This plugin
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loaded will use this variable to initialize the plugin.
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</para>
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@major_version: the major version number of GStreamer that plugin was compiled for
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@minor_version: the minor version number of GStreamer that plugin was compiled for
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@name: a unique name of the plugin
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@description:
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@plugin_init: The init function of this plugin.
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@plugin_exit:
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@version: version of the plugin
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@license: effective license of plugin
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@package: package plugin belongs to
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@origin: URL to provider of plugin
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@_gst_reserved:
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<!-- ##### USER_FUNCTION GstPluginInitFunc ##### -->
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<para>
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A plugin should provide a pointer to a function of this type in the plugin_desc struct.
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It will be called by the loader at statup.
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</para>
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@plugin: The plugin object that can be used to register stuff for this plugin.
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@Returns: A boolean indicating success or failure.
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<!-- # Unused Parameters # -->
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@module: The <classname>GModule</classname> it was loaded from
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<!-- ##### USER_FUNCTION GstPluginExitFunc ##### -->
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<para>
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Exiting function when plugin is unloaded.
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</para>
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@plugin: The plugin object that can be used to unregister stuff for this plugin.
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<!-- ##### MACRO GST_PLUGIN_DEFINE ##### -->
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<para>
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This macro needs to be used to define the entry point and meta data of a plugin.
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One would use this macro to export a plugin, so that it can be used by other applications
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</para>
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@major: major version number of GStreamer that plugin was compiled for
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@minor: minor version number of GStreamer that plugin was compiled for
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@name: short, but unique name of the plugin
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@description: information about the purpose of the plugin
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@init: function pointer to the plugin_init method with the signature of <code>static gboolean plugin_init (GstPlugin * plugin)</code>.
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@version: full version string (e.g. VERSION from config.h)
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@license: under which licence the package has been released, e.g. GPL, LGPL.
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@package: the package-name (e.g. PACKAGE_NAME from config.h)
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@origin: a description from where the package comes from (e.g. the homepage URL)
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<!-- ##### MACRO GST_PLUGIN_DEFINE_STATIC ##### -->
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<para>
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This macro needs to be used to define the entry point and meta data of a local plugin.
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One would use this macro to define a local plugin that can only be used by the own application.
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</para>
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@major: major version number of the GStreamer plugin was compiled for
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@minor: minor version number of the GStreamer plugin was compiled for
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@name: short, but unique name of the plugin
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@description: information about the purpose of the plugin
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@init: function pointer to the plugin_init method with the signature of <code>static gboolean plugin_init (GstPlugin * plugin)</code>.
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@version: full version string (e.g. VERSION from config.h)
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@license: under which licence the package has been released, e.g. GPL, LGPL.
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@package: the package-name (e.g. PACKAGE_NAME from config.h)
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@origin: a description from where the package comes from (e.g. the homepage URL)
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<!-- ##### MACRO GST_LICENSE_UNKNOWN ##### -->
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<para>
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</para>
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<!-- ##### USER_FUNCTION GstPluginFilter ##### -->
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<para>
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A function that can be used with e.g. gst_registry_plugin_filter()
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to get a list of plugins that match certain criteria.
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</para>
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@plugin: the plugin to check
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@user_data: the user_data that has been passed on e.g. gst_registry_plugin_filter()
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@Returns: TRUE for a positive match, FALSE otherwise
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<!-- ##### FUNCTION gst_plugin_get_name ##### -->
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<para>
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</para>
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@plugin:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_get_description ##### -->
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<para>
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</para>
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@plugin:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_get_filename ##### -->
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<para>
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</para>
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@plugin:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_get_license ##### -->
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<para>
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</para>
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@plugin:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_get_package ##### -->
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<para>
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</para>
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@plugin:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_get_origin ##### -->
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<para>
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</para>
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@plugin:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_get_module ##### -->
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<para>
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</para>
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@plugin:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_get_version ##### -->
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<para>
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</para>
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@plugin:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_is_loaded ##### -->
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<para>
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</para>
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@plugin:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_feature_filter ##### -->
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<para>
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</para>
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@plugin:
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@filter:
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@first:
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@user_data:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_list_feature_filter ##### -->
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<para>
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</para>
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@list:
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@filter:
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@first:
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@user_data:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_name_filter ##### -->
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<para>
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</para>
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@plugin:
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@name:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_get_feature_list ##### -->
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<para>
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</para>
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@plugin:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_find_feature ##### -->
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<para>
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</para>
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@plugin:
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@name:
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@type:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_check_file ##### -->
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<para>
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</para>
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@filename:
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@error:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_load_file ##### -->
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<para>
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</para>
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@filename:
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@error:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_unload_plugin ##### -->
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<para>
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</para>
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@plugin:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_add_feature ##### -->
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<para>
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</para>
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@plugin:
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@feature:
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<!-- ##### FUNCTION gst_plugin_load ##### -->
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<para>
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</para>
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@name:
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@Returns:
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<!-- ##### FUNCTION gst_plugin_free ##### -->
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<para>
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</para>
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@plugin:
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<!-- ##### FUNCTION gst_library_load ##### -->
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<para>
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</para>
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@name:
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@Returns:
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