Struct gstreamer_base::BaseSink

pub struct BaseSink(_);

crate::BaseSink is the base class for sink elements in GStreamer, such as xvimagesink or filesink. It is a layer on top of crate::gst::Element that provides a simplified interface to plugin writers. crate::BaseSink handles many details for you, for example: preroll, clock synchronization, state changes, activation in push or pull mode, and queries.

In most cases, when writing sink elements, there is no need to implement class methods from crate::gst::Element or to set functions on pads, because the crate::BaseSink infrastructure should be sufficient.

crate::BaseSink provides support for exactly one sink pad, which should be named “sink”. A sink implementation (subclass of crate::BaseSink) should install a pad template in its class_init function, like so:

static void
my_element_class_init (GstMyElementClass *klass)
{
  GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);

  // sinktemplate should be a #GstStaticPadTemplate with direction
  // %GST_PAD_SINK and name "sink"
  gst_element_class_add_static_pad_template (gstelement_class, &sinktemplate);

  gst_element_class_set_static_metadata (gstelement_class,
      "Sink name",
      "Sink",
      "My Sink element",
      "The author <my.sink@my.email>");
}

crate::BaseSink will handle the prerolling correctly. This means that it will return crate::gst::StateChangeReturn::Async from a state change to PAUSED until the first buffer arrives in this element. The base class will call the [crate::GstBaseSinkClass.preroll()] vmethod with this preroll buffer and will then commit the state change to the next asynchronously pending state.

When the element is set to PLAYING, crate::BaseSink will synchronise on the clock using the times returned from [crate::GstBaseSinkClass.get_times()]. If this function returns GST_CLOCK_TIME_NONE for the start time, no synchronisation will be done. Synchronisation can be disabled entirely by setting the object [crate::BaseSink:sync] property to false.

After synchronisation the virtual method [crate::GstBaseSinkClass.render()] will be called. Subclasses should minimally implement this method.

Subclasses that synchronise on the clock in the [crate::GstBaseSinkClass.render()] method are supported as well. These classes typically receive a buffer in the render method and can then potentially block on the clock while rendering. A typical example is an audiosink. These subclasses can use crate::prelude::BaseSinkExt::wait_preroll() to perform the blocking wait.

Upon receiving the EOS event in the PLAYING state, crate::BaseSink will wait for the clock to reach the time indicated by the stop time of the last [crate::GstBaseSinkClass.get_times()] call before posting an EOS message. When the element receives EOS in PAUSED, preroll completes, the event is queued and an EOS message is posted when going to PLAYING.

crate::BaseSink will internally use the crate::gst::EventType::Segment events to schedule synchronisation and clipping of buffers. Buffers that fall completely outside of the current segment are dropped. Buffers that fall partially in the segment are rendered (and prerolled). Subclasses should do any subbuffer clipping themselves when needed.

crate::BaseSink will by default report the current playback position in crate::gst::Format::Time based on the current clock time and segment information. If no clock has been set on the element, the query will be forwarded upstream.

The [crate::GstBaseSinkClass.set_caps()] function will be called when the subclass should configure itself to process a specific media type.

The [crate::GstBaseSinkClass.start()] and [crate::GstBaseSinkClass.stop()] virtual methods will be called when resources should be allocated. Any [crate::GstBaseSinkClass.preroll()], [crate::GstBaseSinkClass.render()] and [crate::GstBaseSinkClass.set_caps()] function will be called between the [crate::GstBaseSinkClass.start()] and [crate::GstBaseSinkClass.stop()] calls.

The [crate::GstBaseSinkClass.event()] virtual method will be called when an event is received by crate::BaseSink. Normally this method should only be overridden by very specific elements (such as file sinks) which need to handle the newsegment event specially.

The [crate::GstBaseSinkClass.unlock()] method is called when the elements should unblock any blocking operations they perform in the [crate::GstBaseSinkClass.render()] method. This is mostly useful when the [crate::GstBaseSinkClass.render()] method performs a blocking write on a file descriptor, for example.

The [crate::BaseSink:max-lateness] property affects how the sink deals with buffers that arrive too late in the sink. A buffer arrives too late in the sink when the presentation time (as a combination of the last segment, buffer timestamp and element base_time) plus the duration is before the current time of the clock. If the frame is later than max-lateness, the sink will drop the buffer without calling the render method. This feature is disabled if sync is disabled, the [crate::GstBaseSinkClass.get_times()] method does not return a valid start time or max-lateness is set to -1 (the default). Subclasses can use crate::prelude::BaseSinkExt::set_max_lateness() to configure the max-lateness value.

The [crate::BaseSink:qos] property will enable the quality-of-service features of the basesink which gather statistics about the real-time performance of the clock synchronisation. For each buffer received in the sink, statistics are gathered and a QOS event is sent upstream with these numbers. This information can then be used by upstream elements to reduce their processing rate, for example.

The [crate::BaseSink:async] property can be used to instruct the sink to never perform an ASYNC state change. This feature is mostly usable when dealing with non-synchronized streams or sparse streams.

This is an Abstract Base Class, you cannot instantiate it.

Implements

crate::prelude::BaseSinkExt, gst::prelude::ElementExt, gst::prelude::ObjectExt, trait@glib::object::ObjectExt, crate::prelude::BaseSinkExtManual

Trait Implementations

impl Clone for BaseSink

fn clone(&self) -> BaseSink

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for BaseSink

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

Formats the value using the given formatter.

impl Hash for BaseSink

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

Feeds this value into the given Hasher.

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

Feeds a slice of this type into the given Hasher.

impl<T: BaseSinkImpl> IsSubclassable<T> for BaseSink

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

Override the virtual methods of this class for the given subclass and do other class initialization.

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

Instance specific initialization.

impl Ord for BaseSink

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

This method returns an Ordering between self and other.

#[must_use]

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

Compares and returns the maximum of two values.

#[must_use]

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

Compares and returns the minimum of two values.

#[must_use]

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

Restrict a value to a certain interval.

impl ParentClassIs for BaseSink

type Parent = Element

impl<T: ObjectType> PartialEq<T> for BaseSink

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

This method tests for self and other values to be equal, and is used by ==.

#[must_use]

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

This method tests for !=.

impl<T: ObjectType> PartialOrd<T> for BaseSink

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

This method returns an ordering between self and other values if one exists.

#[must_use]

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

This method tests less than (for self and other) and is used by the < operator.

#[must_use]

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

This method tests less than or equal to (for self and other) and is used by the <= operator.

#[must_use]

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

This method tests greater than (for self and other) and is used by the > operator.

#[must_use]

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

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl StaticType for BaseSink

fn static_type() -> Type

Returns the type identifier of Self.

impl Eq for BaseSink

impl IsA<Element> for BaseSink

impl IsA<Object> for BaseSink

impl Send for BaseSink

impl StructuralEq for BaseSink

impl Sync for BaseSink