Struct gstreamer::Plugin

source ·
#[repr(transparent)]
pub struct Plugin { /* private fields */ }
Expand description

GStreamer is extensible, so Element instances can be loaded at runtime. A plugin system can provide one or more of the basic GStreamer PluginFeature subclasses.

A plugin should export a symbol gst_plugin_desc that is a struct of type GstPluginDesc. the plugin loader will check the version of the core library the plugin was linked against and will create a new Plugin. It will then call the GstPluginInitFunc function that was provided in the gst_plugin_desc.

Once you have a handle to a Plugin (e.g. from the Registry), you can add any object that subclasses PluginFeature.

Usually plugins are always automatically loaded so you don’t need to call load() explicitly to bring it into memory. There are options to statically link plugins to an app or even use GStreamer without a plugin repository in which case load() can be needed to bring the plugin into memory.

Implements

GstObjectExt, glib::ObjectExt

Implementations

Make GStreamer aware of external dependencies which affect the feature set of this plugin (ie. the elements or typefinders associated with it).

GStreamer will re-inspect plugins with external dependencies whenever any of the external dependencies change. This is useful for plugins which wrap other plugin systems, e.g. a plugin which wraps a plugin-based visualisation library and makes visualisations available as GStreamer elements, or a codec loader which exposes elements and/or caps dependent on what external codec libraries are currently installed.

env_vars

None-terminated array of environment variables affecting the feature set of the plugin (e.g. an environment variable containing paths where to look for additional modules/plugins of a library), or None. Environment variable names may be followed by a path component which will be added to the content of the environment variable, e.g. “HOME/.mystuff/plugins”.

paths

None-terminated array of directories/paths where dependent files may be, or None.

names

None-terminated array of file names (or file name suffixes, depending on flags) to be used in combination with the paths from paths and/or the paths extracted from the environment variables in env_vars, or None.

flags

optional flags, or GST_PLUGIN_DEPENDENCY_FLAG_NONE

Make GStreamer aware of external dependencies which affect the feature set of this plugin (ie. the elements or typefinders associated with it).

GStreamer will re-inspect plugins with external dependencies whenever any of the external dependencies change. This is useful for plugins which wrap other plugin systems, e.g. a plugin which wraps a plugin-based visualisation library and makes visualisations available as GStreamer elements, or a codec loader which exposes elements and/or caps dependent on what external codec libraries are currently installed.

Convenience wrapper function for add_dependency() which takes simple strings as arguments instead of string arrays, with multiple arguments separated by predefined delimiters (see above).

env_vars

one or more environment variables (separated by ‘:’, ‘;’ or ‘,’), or None. Environment variable names may be followed by a path component which will be added to the content of the environment variable, e.g. “HOME/.mystuff/plugins:MYSTUFF_PLUGINS_PATH”

paths

one ore more directory paths (separated by ‘:’ or ‘;’ or ‘,’), or None. Example: “/usr/lib/mystuff/plugins”

names

one or more file names or file name suffixes (separated by commas), or None

flags

optional flags, or GST_PLUGIN_DEPENDENCY_FLAG_NONE

Get the long descriptive name of the plugin

Returns

the long name of the plugin

get the filename of the plugin

Returns

the filename of the plugin

get the license of the plugin

Returns

the license of the plugin

Get the short name of the plugin

Returns

the name of the plugin

get the URL where the plugin comes from

Returns

the origin of the plugin

get the package the plugin belongs to.

Returns

the package of the plugin

Get the release date (and possibly time) in form of a string, if available.

For normal GStreamer plugin releases this will usually just be a date in the form of “YYYY-MM-DD”, while pre-releases and builds from git may contain a time component after the date as well, in which case the string will be formatted like “YYYY-MM-DDTHH:MMZ” (e.g. “2012-04-30T09:30Z”).

There may be plugins that do not have a valid release date set on them.

Returns

the date string of the plugin, or None if not available.

get the source module the plugin belongs to.

Returns

the source of the plugin

get the version of the plugin

Returns

the version of the plugin

queries if the plugin is loaded into memory

Returns

true is loaded, false otherwise

Loads self. Note that the return value is the loaded plugin; self is untouched. The normal use pattern of this function goes like this:

GstPlugin *loaded_plugin;
loaded_plugin = gst_plugin_load (plugin);
// presumably, we're no longer interested in the potentially-unloaded plugin
gst_object_unref (plugin);
plugin = loaded_plugin;
Returns

a reference to a loaded plugin, or None on error.

Load the named plugin. Refs the plugin.

name

name of plugin to load

Returns

a reference to a loaded plugin, or None on error.

Loads the given plugin and refs it. Caller needs to unref after use.

filename

the plugin filename to load

Returns

a reference to the existing loaded GstPlugin, a reference to the newly-loaded GstPlugin, or None if an error occurred.

Gets the plugin specific data cache. If it is None there is no cached data stored. This is the case when the registry is getting rebuilt.

Returns

The cached data as a Structure or None.

Adds plugin specific data to cache. Passes the ownership of the structure to the self.

The cache is flushed every time the registry is rebuilt.

cache_data

a structure containing the data to cache

Trait Implementations

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
Formats the value using the given formatter. Read more
Feeds this value into the given Hasher. Read more
Feeds a slice of this type into the given Hasher. Read more
This method returns an Ordering between self and other. Read more
Compares and returns the maximum of two values. Read more
Compares and returns the minimum of two values. Read more
Restrict a value to a certain interval. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more
This method returns an ordering between self and other values if one exists. Read more
This method tests less than (for self and other) and is used by the < operator. Read more
This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
This method tests greater than (for self and other) and is used by the > operator. Read more
This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
Returns the type identifier of Self.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
Upcasts an object to a superclass or interface T. Read more
Upcasts an object to a reference of its superclass or interface T. Read more
Tries to downcast to a subclass or interface implementor T. Read more
Tries to downcast to a reference of its subclass or interface implementor T. Read more
Tries to cast to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while downcast and upcast will do many checks at compile-time already. Read more
Tries to cast to reference to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while downcast and upcast will do many checks at compile-time already. Read more
Casts to T unconditionally. Read more
Casts to &T unconditionally. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Returns true if the object is an instance of (can be cast to) T.
Returns the type of the object.
Returns the ObjectClass of the object. Read more
Returns the class of the object.
Returns the class of the object in the given type T. Read more
Returns the interface T of the object. Read more
Sets the property property_name of the object to value value. Read more
Sets the property property_name of the object to value value. Read more
Sets multiple properties of the object at once. Read more
Sets multiple properties of the object at once. Read more
Gets the property property_name of the object and cast it to the type V. Read more
Gets the property property_name of the object. Read more
Check if the object has a property property_name of the given type_. Read more
Get the type of the property property_name of this object. Read more
Get the ParamSpec of the property property_name of this object.
Return all ParamSpec of the properties of this object.
Freeze all property notifications until the return guard object is dropped. Read more
Set arbitrary data on this object with the given key. Read more
Return previously set arbitrary data of this object with the given key. Read more
Retrieve previously set arbitrary data of this object with the given key. Read more
Set arbitrary data on this object with the given key. Read more
Return previously set arbitrary data of this object with the given key. Read more
Retrieve previously set arbitrary data of this object with the given key. Read more
Block a given signal handler. Read more
Unblock a given signal handler.
Stop emission of the currently emitted signal.
Stop emission of the currently emitted signal by the (possibly detailed) signal name.
Connect to the signal signal_name on this object. Read more
Connect to the signal signal_id on this object. Read more
Connect to the signal signal_name on this object. Read more
Connect to the signal signal_id on this object. Read more
Connect to the signal signal_name on this object. Read more
Connect to the signal signal_id on this object. Read more
Connect a closure to the signal signal_name on this object. Read more
Connect a closure to the signal signal_id on this object. Read more
Limits the lifetime of closure to the lifetime of the object. When the object’s reference count drops to zero, the closure will be invalidated. An invalidated closure will ignore any calls to invoke_with_values, or invoke when using Rust closures. Read more
Emit signal by signal id. Read more
Same as Self::emit but takes Value for the arguments.
Emit signal by its name. Read more
Emit signal by its name. Read more
Emit signal by its name with details. Read more
Emit signal by its name with details. Read more
Emit signal by signal id with details. Read more
Emit signal by signal id with details. Read more
Disconnect a previously connected signal handler.
Connect to the notify signal of the object. Read more
Connect to the notify signal of the object. Read more
Connect to the notify signal of the object. Read more
Notify that the given property has changed its value. Read more
Notify that the given property has changed its value. Read more
Downgrade this object to a weak reference.
Add a callback to be notified when the Object is disposed.
Add a callback to be notified when the Object is disposed. Read more
Bind property source_property on this object to the target_property on the target object. Read more
Returns the strong reference count of this object.
Runs the dispose mechanism of the object. Read more
Ensures that the type has been registered with the type system.
The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
Returns a SendValue clone of self.
Converts the given value to a String. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.