#[repr(transparent)]pub struct Object { /* private fields */ }Expand description
Object provides a root for the object hierarchy tree filed in by the
GStreamer library. It is currently a thin wrapper on top of
GInitiallyUnowned. It is an abstract class that is not very usable on its own.
Object gives us basic refcounting, parenting functionality and locking.
Most of the functions are just extended for special GStreamer needs and can be
found under the same name in the base class of Object which is glib::Object
(e.g. g_object_ref() becomes gst_object_ref()).
Since Object derives from GInitiallyUnowned, it also inherits the
floating reference. Be aware that functions such as GstBinExt::add() and
ElementExt::add_pad() take ownership of the floating reference.
In contrast to glib::Object instances, Object adds a name property. The functions
gst_object_set_name() and GstObjectExt::name() are used to set/get the name
of the object.
controlled properties
Controlled properties offers a lightweight way to adjust gobject properties over stream-time. It works by using time-stamped value pairs that are queued for element-properties. At run-time the elements continuously pull value changes for the current stream-time.
What needs to be changed in a Element?
Very little - it is just two steps to make a plugin controllable!
-
mark gobject-properties paramspecs that make sense to be controlled, by GST_PARAM_CONTROLLABLE.
-
when processing data (get, chain, loop function) at the beginning call gst_object_sync_values(element,timestamp). This will make the controller update all GObject properties that are under its control with the current values based on the timestamp.
What needs to be done in applications? Again it’s not a lot to change.
-
create a
ControlSource. csource = gst_interpolation_control_source_new (); g_object_set (csource, “mode”, GST_INTERPOLATION_MODE_LINEAR, NULL); -
Attach the
ControlSourceon the controller to a property. gst_object_add_control_binding (object, gst_direct_control_binding_new (object, “prop1”, csource)); -
Set the control values gst_timed_value_control_source_set ((GstTimedValueControlSource *)csource,0 * GST_SECOND, value1); gst_timed_value_control_source_set ((GstTimedValueControlSource *)csource,1 * GST_SECOND, value2);
-
start your pipeline
This is an Abstract Base Class, you cannot instantiate it.
Properties
name
Readable | Writeable | Construct
parent
The parent of the object. Please note, that when changing the ‘parent’
property, we don’t emit notify and deep-notify
signals due to locking issues. In some cases one can use
element-added or element-removed signals on the parent to
achieve a similar effect.
Readable | Writeable
Signals
deep-notify
The deep notify signal is used to be notified of property changes. It is typically attached to the toplevel bin to receive notifications from all the elements contained in that bin.
Detailed
Implements
Implementations§
source§impl Object
impl Object
pub const NONE: Option<&'static Object> = None
sourcepub fn check_uniqueness(list: &[Object], name: &str) -> bool
pub fn check_uniqueness(list: &[Object], name: &str) -> bool
Checks to see if there is any object named name in list. This function
does not do any locking of any kind. You might want to protect the
provided list with the lock of the owner of the list. This function
will lock each Object in the list to compare the name, so be
careful when passing a list with a locked object.
list
a list of Object to
check through
name
the name to search for
Returns
true if a Object named name does not appear in list,
false if it does.
MT safe. Grabs and releases the LOCK of each object in the list.
Trait Implementations§
source§impl HasParamSpec for Object
impl HasParamSpec for Object
source§impl<T: GstObjectImpl> IsSubclassable<T> for Object
impl<T: GstObjectImpl> IsSubclassable<T> for Object
source§fn class_init(class: &mut Class<Self>)
fn class_init(class: &mut Class<Self>)
Override the virtual methods of this class for the given subclass and do other class
initialization. Read more
source§fn instance_init(instance: &mut InitializingObject<T>)
fn instance_init(instance: &mut InitializingObject<T>)
Instance specific initialization. Read more
source§impl Ord for Object
impl Ord for Object
source§impl<OT: ObjectType> PartialEq<OT> for Object
impl<OT: ObjectType> PartialEq<OT> for Object
source§impl<OT: ObjectType> PartialOrd<OT> for Object
impl<OT: ObjectType> PartialOrd<OT> for Object
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
This method tests less than or equal to (for
self and other) and is used by the <=
operator. Read moresource§impl StaticType for Object
impl StaticType for Object
source§fn static_type() -> Type
fn static_type() -> Type
Returns the type identifier of
Self.impl Eq for Object
impl IsA<Object> for Allocator
impl IsA<Object> for Bin
impl IsA<Object> for BufferPool
impl IsA<Object> for Bus
impl IsA<Object> for Clock
impl IsA<Object> for ControlBinding
impl IsA<Object> for ControlSource
impl IsA<Object> for Device
impl IsA<Object> for DeviceMonitor
impl IsA<Object> for DeviceProvider
impl IsA<Object> for DeviceProviderFactory
impl IsA<Object> for Element
impl IsA<Object> for ElementFactory
impl IsA<Object> for GhostPad
impl IsA<Object> for Pad
impl IsA<Object> for PadTemplate
impl IsA<Object> for Pipeline
impl IsA<Object> for Plugin
impl IsA<Object> for PluginFeature
impl IsA<Object> for ProxyPad
impl IsA<Object> for Registry
impl IsA<Object> for Stream
impl IsA<Object> for StreamCollection
impl IsA<Object> for SystemClock
impl IsA<Object> for TagSetter
impl IsA<Object> for Task
impl IsA<Object> for TaskPool
impl IsA<Object> for TocSetter
impl IsA<Object> for Tracer
impl IsA<Object> for TracerFactory
impl IsA<Object> for TypeFindFactory
impl Send for Object
impl Sync for Object
Auto Trait Implementations§
Blanket Implementations§
source§impl<T> Cast for Twhere
T: ObjectType,
impl<T> Cast for Twhere
T: ObjectType,
source§fn upcast<T>(self) -> Twhere
T: ObjectType,
Self: IsA<T>,
fn upcast<T>(self) -> Twhere
T: ObjectType,
Self: IsA<T>,
Upcasts an object to a superclass or interface
T. Read moresource§fn upcast_ref<T>(&self) -> &Twhere
T: ObjectType,
Self: IsA<T>,
fn upcast_ref<T>(&self) -> &Twhere
T: ObjectType,
Self: IsA<T>,
Upcasts an object to a reference of its superclass or interface
T. Read moresource§fn downcast<T>(self) -> Result<T, Self>where
T: ObjectType,
Self: CanDowncast<T>,
fn downcast<T>(self) -> Result<T, Self>where
T: ObjectType,
Self: CanDowncast<T>,
Tries to downcast to a subclass or interface implementor
T. Read moresource§fn downcast_ref<T>(&self) -> Option<&T>where
T: ObjectType,
Self: CanDowncast<T>,
fn downcast_ref<T>(&self) -> Option<&T>where
T: ObjectType,
Self: CanDowncast<T>,
Tries to downcast to a reference of its subclass or interface implementor
T. Read moresource§fn dynamic_cast<T>(self) -> Result<T, Self>where
T: ObjectType,
fn dynamic_cast<T>(self) -> Result<T, Self>where
T: ObjectType,
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 moresource§fn dynamic_cast_ref<T>(&self) -> Option<&T>where
T: ObjectType,
fn dynamic_cast_ref<T>(&self) -> Option<&T>where
T: ObjectType,
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 moresource§unsafe fn unsafe_cast<T>(self) -> Twhere
T: ObjectType,
unsafe fn unsafe_cast<T>(self) -> Twhere
T: ObjectType,
Casts to
T unconditionally. Read moresource§unsafe fn unsafe_cast_ref<T>(&self) -> &Twhere
T: ObjectType,
unsafe fn unsafe_cast_ref<T>(&self) -> &Twhere
T: ObjectType,
Casts to
&T unconditionally. Read moresource§impl<T> IntoClosureReturnValue for Twhere
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fn into_closure_return_value(self) -> Option<Value>
source§impl<U> IsSubclassableExt for Uwhere
U: IsClass + ParentClassIs,
impl<U> IsSubclassableExt for Uwhere
U: IsClass + ParentClassIs,
fn parent_class_init<T>(class: &mut Class<U>)where
T: ObjectSubclass,
<U as ParentClassIs>::Parent: IsSubclassable<T>,
fn parent_instance_init<T>(instance: &mut InitializingObject<T>)where
T: ObjectSubclass,
<U as ParentClassIs>::Parent: IsSubclassable<T>,
source§impl<T> ObjectExt for Twhere
T: ObjectType,
impl<T> ObjectExt for Twhere
T: ObjectType,
source§fn is<U>(&self) -> boolwhere
U: StaticType,
fn is<U>(&self) -> boolwhere
U: StaticType,
Returns
true if the object is an instance of (can be cast to) T.source§fn object_class(&self) -> &Class<Object>
fn object_class(&self) -> &Class<Object>
Returns the
ObjectClass of the object. Read moresource§fn class_of<U>(&self) -> Option<&Class<U>>where
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fn class_of<U>(&self) -> Option<&Class<U>>where
U: IsClass,
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fn interface<U>(&self) -> Option<InterfaceRef<'_, U>>where
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Returns the interface
T of the object. Read moresource§fn set_property_from_value(&self, property_name: &str, value: &Value)
fn set_property_from_value(&self, property_name: &str, value: &Value)
source§fn set_properties(&self, property_values: &[(&str, &dyn ToValue)])
fn set_properties(&self, property_values: &[(&str, &dyn ToValue)])
Sets multiple properties of the object at once. Read more
source§fn set_properties_from_value(&self, property_values: &[(&str, Value)])
fn set_properties_from_value(&self, property_values: &[(&str, Value)])
Sets multiple properties of the object at once. Read more
source§fn property<V>(&self, property_name: &str) -> Vwhere
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Gets the property
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Gets the property
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fn property_type(&self, property_name: &str) -> Option<Type>
Get the type of the property
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fn find_property(&self, property_name: &str) -> Option<ParamSpec>
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fn list_properties(&self) -> PtrSlice<ParamSpec>
Return all
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fn freeze_notify(&self) -> PropertyNotificationFreezeGuard
Freeze all property notifications until the return guard object is dropped. Read more
source§unsafe fn set_qdata<QD>(&self, key: Quark, value: QD)where
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QD: 'static,
Set arbitrary data on this object with the given
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Return previously set arbitrary data of this object with the given
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Retrieve previously set arbitrary data of this object with the given
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Set arbitrary data on this object with the given
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Return previously set arbitrary data of this object with the given
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unsafe fn steal_data<QD>(&self, key: &str) -> Option<QD>where
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Retrieve previously set arbitrary data of this object with the given
key. Read moresource§fn block_signal(&self, handler_id: &SignalHandlerId)
fn block_signal(&self, handler_id: &SignalHandlerId)
Block a given signal handler. Read more
source§fn unblock_signal(&self, handler_id: &SignalHandlerId)
fn unblock_signal(&self, handler_id: &SignalHandlerId)
Unblock a given signal handler.
source§fn stop_signal_emission(&self, signal_id: SignalId, detail: Option<Quark>)
fn stop_signal_emission(&self, signal_id: SignalId, detail: Option<Quark>)
Stop emission of the currently emitted signal.
source§fn stop_signal_emission_by_name(&self, signal_name: &str)
fn stop_signal_emission_by_name(&self, signal_name: &str)
Stop emission of the currently emitted signal by the (possibly detailed) signal name.
source§fn connect<F>(
&self,
signal_name: &str,
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) -> SignalHandlerIdwhere
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&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerIdwhere
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Connect to the signal
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&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerIdwhere
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&self,
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callback: F
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&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerIdwhere
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Connect to the signal
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&self,
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details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerIdwhere
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&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerIdwhere
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Connect to the signal
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&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerIdwhere
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&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value>,
Connect to the signal
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&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value>,
unsafe fn connect_unsafe_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value>,
Connect to the signal
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&self,
signal_name: &str,
after: bool,
closure: RustClosure
) -> SignalHandlerId
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&self,
signal_name: &str,
after: bool,
closure: RustClosure
) -> SignalHandlerId
Connect a closure to the signal
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&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
closure: RustClosure
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&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
closure: RustClosure
) -> SignalHandlerId
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&self,
signal_name: &str,
args: &[Value]
) -> Option<Value>
fn emit_by_name_with_values(
&self,
signal_name: &str,
args: &[Value]
) -> Option<Value>
Emit signal by its name. Read more
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&self,
signal_name: &str,
details: Quark,
args: &[&dyn ToValue]
) -> Rwhere
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&self,
signal_name: &str,
details: Quark,
args: &[&dyn ToValue]
) -> Rwhere
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&self,
signal_name: &str,
details: Quark,
args: &[Value]
) -> Option<Value>
fn emit_by_name_with_details_and_values(
&self,
signal_name: &str,
details: Quark,
args: &[Value]
) -> Option<Value>
Emit signal by its name with details. Read more
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&self,
signal_id: SignalId,
details: Quark,
args: &[&dyn ToValue]
) -> Rwhere
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&self,
signal_id: SignalId,
details: Quark,
args: &[&dyn ToValue]
) -> Rwhere
R: TryFromClosureReturnValue,
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&self,
signal_id: SignalId,
details: Quark,
args: &[Value]
) -> Option<Value>
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&self,
signal_id: SignalId,
details: Quark,
args: &[Value]
) -> Option<Value>
Emit signal by signal id with details. Read more
source§fn disconnect(&self, handler_id: SignalHandlerId)
fn disconnect(&self, handler_id: SignalHandlerId)
Disconnect a previously connected signal handler.
source§fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec) + Send + Sync + 'static,
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F: Fn(&T, &ParamSpec) + Send + Sync + 'static,
Connect to the
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F: Fn(&T, &ParamSpec) + 'static,
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&self,
name: Option<&str>,
f: F
) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec),
unsafe fn connect_notify_unsafe<F>(
&self,
name: Option<&str>,
f: F
) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec),
Connect to the
notify signal of the object. Read moresource§fn notify(&self, property_name: &str)
fn notify(&self, property_name: &str)
Notify that the given property has changed its value. Read more
source§fn notify_by_pspec(&self, pspec: &ParamSpec)
fn notify_by_pspec(&self, pspec: &ParamSpec)
Notify that the given property has changed its value. Read more
source§fn add_weak_ref_notify<F>(&self, f: F) -> WeakRefNotify<T>where
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Add a callback to be notified when the Object is disposed.
source§fn add_weak_ref_notify_local<F>(&self, f: F) -> WeakRefNotify<T>where
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source§fn bind_property<'f, 't, O, 'a>(
&'a self,
source_property: &'a str,
target: &'a O,
target_property: &'a str
) -> BindingBuilder<'a, 'f, 't>where
O: ObjectType,
fn bind_property<'f, 't, O, 'a>(
&'a self,
source_property: &'a str,
target: &'a O,
target_property: &'a str
) -> BindingBuilder<'a, 'f, 't>where
O: ObjectType,
source§unsafe fn run_dispose(&self)
unsafe fn run_dispose(&self)
Runs the dispose mechanism of the object. Read more
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