Struct gstreamer::Bin

source · [−]

#[repr(transparent)]
pub struct Bin { /* private fields */ }

Expand description

Bin is an element that can contain other Element, allowing them to be managed as a group. Pads from the child elements can be ghosted to the bin, see GhostPad. This makes the bin look like any other elements and enables creation of higher-level abstraction elements.

A new Bin is created with new(). Use a Pipeline instead if you want to create a toplevel bin because a normal bin doesn’t have a bus or handle clock distribution of its own.

After the bin has been created you will typically add elements to it with GstBinExt::add(). You can remove elements with GstBinExt::remove().

An element can be retrieved from a bin with GstBinExt::by_name(), using the elements name. GstBinExt::by_name_recurse_up() is mainly used for internal purposes and will query the parent bins when the element is not found in the current bin.

An iterator of elements in a bin can be retrieved with GstBinExtManual::iterate_elements(). Various other iterators exist to retrieve the elements in a bin.

gst_object_unref() is used to drop your reference to the bin.

The signal::Bin::element-added signal is fired whenever a new element is added to the bin. Likewise the signal::Bin::element-removed signal is fired whenever an element is removed from the bin.

A Bin internally intercepts every Message posted by its children and implements the following default behaviour for each of them:

GST_MESSAGE_EOS: This message is only posted by sinks in the PLAYING state. If all sinks posted the EOS message, this bin will post and EOS message upwards.
GST_MESSAGE_SEGMENT_START: Just collected and never forwarded upwards. The messages are used to decide when all elements have completed playback of their segment.
GST_MESSAGE_SEGMENT_DONE: Is posted by Bin when all elements that posted a SEGMENT_START have posted a SEGMENT_DONE.
GST_MESSAGE_DURATION_CHANGED: Is posted by an element that detected a change in the stream duration. The duration change is posted to the application so that it can refetch the new duration with a duration query.

Note that these messages can be posted before the bin is prerolled, in which case the duration query might fail.

Note also that there might be a discrepancy (due to internal buffering/queueing) between the stream being currently displayed and the returned duration query.

Applications might want to also query for duration (and changes) by listening to the GST_MESSAGE_STREAM_START message, signaling the active start of a (new) stream.

GST_MESSAGE_CLOCK_LOST: This message is posted by an element when it can no longer provide a clock.

The default bin behaviour is to check if the lost clock was the one provided by the bin. If so and the bin is currently in the PLAYING state, the message is forwarded to the bin parent.

This message is also generated when a clock provider is removed from the bin. If this message is received by the application, it should PAUSE the pipeline and set it back to PLAYING to force a new clock distribution.

GST_MESSAGE_CLOCK_PROVIDE: This message is generated when an element can provide a clock. This mostly happens when a new clock provider is added to the bin.

The default behaviour of the bin is to mark the currently selected clock as dirty, which will perform a clock recalculation the next time the bin is asked to provide a clock.

This message is never sent to the application but is forwarded to the parent of the bin.

OTHERS: posted upwards.

A Bin implements the following default behaviour for answering to a Query:

GST_QUERY_DURATION: The bin will forward the query to all sink elements contained within and will return the maximum value. If no sinks are available in the bin, the query fails.
GST_QUERY_POSITION: The query is sent to all sink elements in the bin and the MAXIMUM of all values is returned. If no sinks are available in the bin, the query fails.
OTHERS: the query is forwarded to all sink elements, the result of the first sink that answers the query successfully is returned. If no sink is in the bin, the query fails.

A Bin will by default forward any event sent to it to all sink ( EventTypeFlags::DOWNSTREAM ) or source ( EventTypeFlags::UPSTREAM ) elements depending on the event type.

If all the elements return true, the bin will also return true, else false is returned. If no elements of the required type are in the bin, the event handler will return true.

Implements

GstBinExt, ElementExt, GstObjectExt, glib::ObjectExt, ChildProxyExt, ElementExtManual, ChildProxyExtManual

Struct gstreamer::Bin

Implementations

impl Bin

pub const NONE: Option<&'static Bin>

pub fn new(name: Option<&str>) -> Bin

Trait Implementations

impl Clone for Bin

fn clone(&self) -> Self

fn clone_from(&mut self, source: &Self)

impl Debug for Bin

fn fmt(&self, f: &mut Formatter<'_>) -> Result

impl Hash for Bin

fn hash<H>(&self, state: &mut H) where H: Hasher,

fn hash_slice<H>(data: &[Self], state: &mut H) where H: Hasher,

impl<T: BinImpl> IsSubclassable<T> for Bin

fn class_init(klass: &mut Class<Self>)

fn instance_init(instance: &mut InitializingObject<T>)

impl Ord for Bin

fn cmp(&self, other: &Self) -> Ordering

fn max(self, other: Self) -> Self

fn min(self, other: Self) -> Self

fn clamp(self, min: Self, max: Self) -> Self

impl ParentClassIs for Bin

type Parent = Element

impl<OT: ObjectType> PartialEq<OT> for Bin

fn eq(&self, other: &OT) -> bool

fn ne(&self, other: &Rhs) -> bool

impl<OT: ObjectType> PartialOrd<OT> for Bin

fn partial_cmp(&self, other: &OT) -> Option<Ordering>

fn lt(&self, other: &Rhs) -> bool

fn le(&self, other: &Rhs) -> bool

fn gt(&self, other: &Rhs) -> bool

fn ge(&self, other: &Rhs) -> bool

impl StaticType for Bin

fn static_type() -> Type

impl Eq for Bin

impl IsA<Bin> for Pipeline

impl IsA<ChildProxy> for Bin

impl IsA<Element> for Bin

impl IsA<Object> for Bin

impl Send for Bin

impl Sync for Bin

Auto Trait Implementations

impl RefUnwindSafe for Bin

impl Unpin for Bin

impl UnwindSafe for Bin

Blanket Implementations

impl<T> Any for T where T: 'static + ?Sized,

pub fn type_id(&self) -> TypeId

impl<T> Borrow<T> for T where T: ?Sized,

pub fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where T: ?Sized,

pub fn borrow_mut(&mut self) -> &mut T

impl<T> Cast for T where T: ObjectType,

fn upcast<T>(self) -> T where T: ObjectType, Self: IsA<T>,

fn upcast_ref<T>(&self) -> &T where T: ObjectType, Self: IsA<T>,

fn downcast<T>(self) -> Result<T, Self> where T: ObjectType, Self: CanDowncast<T>,

fn downcast_ref<T>(&self) -> Option<&T> where T: ObjectType, Self: CanDowncast<T>,

fn dynamic_cast<T>(self) -> Result<T, Self> where T: ObjectType,

fn dynamic_cast_ref<T>(&self) -> Option<&T> where T: ObjectType,

unsafe fn unsafe_cast<T>(self) -> T where T: ObjectType,

unsafe fn unsafe_cast_ref<T>(&self) -> &T where T: ObjectType,

impl<T> From<T> for T

pub fn from(t: T) -> T

impl<T, U> Into<U> for T where U: From<T>,

pub fn into(self) -> U

impl<U> IsSubclassableExt for U where U: IsClass + ParentClassIs,

pub fn parent_class_init<T>(class: &mut Class<U>) where T: ObjectSubclass, <U as ParentClassIs>::Parent: IsSubclassable<T>,

pub fn parent_instance_init<T>(instance: &mut InitializingObject<T>) where T: ObjectSubclass, <U as ParentClassIs>::Parent: IsSubclassable<T>,

impl<T> ObjectExt for T where T: ObjectType,

pub fn is<U>(&self) -> bool where U: StaticType,

pub fn type_(&self) -> Type

pub fn object_class(&self) -> &Class<Object>

pub fn class(&self) -> &Class<T> where T: IsClass,

pub fn class_of<U>(&self) -> Option<&Class<U>> where U: IsClass,

pub fn interface<U>(&self) -> Option<InterfaceRef<'_, U>> where U: IsInterface,

pub fn try_set_property<V>( &self, property_name: &str, value: V) -> Result<(), BoolError> where V: ToValue,

pub fn set_property<V>(&self, property_name: &str, value: V) where V: ToValue,

pub fn try_set_property_from_value( &self, property_name: &str, value: &Value) -> Result<(), BoolError>

pub fn set_property_from_value(&self, property_name: &str, value: &Value)

fn hash<H>(&self, state: &mut H) where
H: Hasher,

fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,

impl<T> Any for T where
T: 'static + ?Sized,

impl<T> Borrow<T> for T where
T: ?Sized,

impl<T> BorrowMut<T> for T where
T: ?Sized,

impl<T> Cast for T where
T: ObjectType,

fn upcast<T>(self) -> T where
T: ObjectType,
Self: IsA<T>,

fn upcast_ref<T>(&self) -> &T where
T: ObjectType,
Self: IsA<T>,

fn downcast<T>(self) -> Result<T, Self> where
T: ObjectType,
Self: CanDowncast<T>,

fn downcast_ref<T>(&self) -> Option<&T> where
T: ObjectType,
Self: CanDowncast<T>,

fn dynamic_cast<T>(self) -> Result<T, Self> where
T: ObjectType,

fn dynamic_cast_ref<T>(&self) -> Option<&T> where
T: ObjectType,

unsafe fn unsafe_cast<T>(self) -> T where
T: ObjectType,

unsafe fn unsafe_cast_ref<T>(&self) -> &T where
T: ObjectType,

impl<T, U> Into<U> for T where
U: From<T>,

impl<U> IsSubclassableExt for U where
U: IsClass + ParentClassIs,

pub fn parent_class_init<T>(class: &mut Class<U>) where
T: ObjectSubclass,
<U as ParentClassIs>::Parent: IsSubclassable<T>,

pub fn parent_instance_init<T>(instance: &mut InitializingObject<T>) where
T: ObjectSubclass,
<U as ParentClassIs>::Parent: IsSubclassable<T>,

impl<T> ObjectExt for T where
T: ObjectType,

pub fn is<U>(&self) -> bool where
U: StaticType,

pub fn class(&self) -> &Class<T> where
T: IsClass,

pub fn class_of<U>(&self) -> Option<&Class<U>> where
U: IsClass,

pub fn interface<U>(&self) -> Option<InterfaceRef<'_, U>> where
U: IsInterface,

pub fn try_set_property<V>(
&self,
property_name: &str,
value: V
) -> Result<(), BoolError> where
V: ToValue,

pub fn set_property<V>(&self, property_name: &str, value: V) where
V: ToValue,

pub fn try_set_property_from_value(
&self,
property_name: &str,
value: &Value
) -> Result<(), BoolError>

pub fn try_set_properties(
&self,
property_values: &[(&str, &dyn ToValue )]
) -> Result<(), BoolError>

pub fn set_properties(&self, property_values: &[(&str, &dyn ToValue )])

pub fn try_set_properties_from_value(
&self,
property_values: &[(&str, Value )]
) -> Result<(), BoolError>

pub fn set_properties_from_value(&self, property_values: &[(&str, Value )])

pub fn try_property<V>(&self, property_name: &str) -> Result<V, BoolError> where
V: 'static + for<'b> FromValue<'b>,

pub fn property<V>(&self, property_name: &str) -> V where
V: 'static + for<'b> FromValue<'b>,

pub fn try_property_value(
&self,
property_name: &str
) -> Result<Value, BoolError>

pub unsafe fn set_qdata<QD>(&self, key: Quark, value: QD) where
QD: 'static,

pub unsafe fn qdata<QD>(&self, key: Quark) -> Option<NonNull<QD>> where
QD: 'static,

pub unsafe fn steal_qdata<QD>(&self, key: Quark) -> Option<QD> where
QD: 'static,

pub unsafe fn set_data<QD>(&self, key: &str, value: QD) where
QD: 'static,

pub unsafe fn data<QD>(&self, key: &str) -> Option<NonNull<QD>> where
QD: 'static,

pub unsafe fn steal_data<QD>(&self, key: &str) -> Option<QD> where
QD: 'static,

pub fn try_connect<F>(
&self,
signal_name: &str,
after: bool,
callback: F
) -> Result<SignalHandlerId, BoolError> where
F: 'static + Fn(&[Value ]) -> Option<Value> + Send + Sync,

pub fn connect<F>(
&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerId where
F: 'static + Fn(&[Value ]) -> Option<Value> + Send + Sync,

pub fn try_connect_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> Result<SignalHandlerId, BoolError> where
F: 'static + Fn(&[Value ]) -> Option<Value> + Send + Sync,

pub fn connect_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerId where
F: 'static + Fn(&[Value ]) -> Option<Value> + Send + Sync,

pub fn try_connect_local<F>(
&self,
signal_name: &str,
after: bool,
callback: F
) -> Result<SignalHandlerId, BoolError> where
F: 'static + Fn(&[Value ]) -> Option<Value>,

pub fn connect_local<F>(
&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerId where
F: 'static + Fn(&[Value ]) -> Option<Value>,

pub fn try_connect_local_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> Result<SignalHandlerId, BoolError> where
F: 'static + Fn(&[Value ]) -> Option<Value>,

pub fn connect_local_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerId where
F: 'static + Fn(&[Value ]) -> Option<Value>,

pub unsafe fn try_connect_unsafe<F>(
&self,
signal_name: &str,
after: bool,
callback: F
) -> Result<SignalHandlerId, BoolError> where
F: Fn(&[Value ]) -> Option<Value>,

pub unsafe fn connect_unsafe<F>(
&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerId where
F: Fn(&[Value ]) -> Option<Value>,

pub unsafe fn try_connect_unsafe_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> Result<SignalHandlerId, BoolError> where
F: Fn(&[Value ]) -> Option<Value>,

pub fn try_connect_closure(
&self,
signal_name: &str,
after: bool,
closure: RustClosure
) -> Result<SignalHandlerId, BoolError>

pub fn connect_closure(
&self,
signal_name: &str,
after: bool,
closure: RustClosure
) -> SignalHandlerId

pub fn try_connect_closure_id(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
closure: RustClosure
) -> Result<SignalHandlerId, BoolError>

pub fn connect_closure_id(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
closure: RustClosure
) -> SignalHandlerId

pub unsafe fn connect_unsafe_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerId where
F: Fn(&[Value ]) -> Option<Value>,

pub fn try_emit<R>(
&self,
signal_id: SignalId,
args: &[&dyn ToValue ]
) -> Result<R, BoolError> where
R: TryFromClosureReturnValue,

pub fn emit<R>(&self, signal_id: SignalId, args: &[&dyn ToValue ]) -> R where
R: TryFromClosureReturnValue,

pub fn try_emit_with_values(
&self,
signal_id: SignalId,
args: &[Value ]
) -> Result<Option<Value>, BoolError>

pub fn emit_with_values(
&self,
signal_id: SignalId,
args: &[Value ]
) -> Option<Value>

pub fn try_emit_by_name<R>(
&self,
signal_name: &str,
args: &[&dyn ToValue ]
) -> Result<R, BoolError> where
R: TryFromClosureReturnValue,

pub fn emit_by_name<R>(&self, signal_name: &str, args: &[&dyn ToValue ]) -> R where
R: TryFromClosureReturnValue,

pub fn try_emit_by_name_with_values(
&self,
signal_name: &str,
args: &[Value ]
) -> Result<Option<Value>, BoolError>

pub fn emit_by_name_with_values(
&self,
signal_name: &str,
args: &[Value ]
) -> Option<Value>

pub fn try_emit_with_details<R>(
&self,
signal_id: SignalId,
details: Quark,
args: &[&dyn ToValue ]
) -> Result<R, BoolError> where
R: TryFromClosureReturnValue,

pub fn emit_with_details<R>(
&self,
signal_id: SignalId,
details: Quark,
args: &[&dyn ToValue ]
) -> R where
R: TryFromClosureReturnValue,

pub fn try_emit_with_details_and_values(
&self,
signal_id: SignalId,
details: Quark,
args: &[Value ]
) -> Result<Option<Value>, BoolError>

pub fn emit_with_details_and_values(
&self,
signal_id: SignalId,
details: Quark,
args: &[Value ]
) -> Option<Value>

pub fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId where
F: 'static + Fn(&T, &ParamSpec) + Send + Sync,

pub fn connect_notify_local<F>(
&self,
name: Option<&str>,
f: F
) -> SignalHandlerId where
F: 'static + Fn(&T, &ParamSpec),

pub unsafe fn connect_notify_unsafe<F>(
&self,
name: Option<&str>,
f: F
) -> SignalHandlerId where
F: Fn(&T, &ParamSpec),