BaseSink

#GstBaseSink is the base class for sink elements in GStreamer, such as xvimagesink or filesink. It is a layer on top of #GstElement that provides a simplified interface to plugin writers. #GstBaseSink 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 #GstElement or to set functions on pads, because the #GstBaseSink infrastructure should be sufficient.

#GstBaseSink provides support for exactly one sink pad, which should be named "sink". A sink implementation (subclass of #GstBaseSink) 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>");
}

#GstBaseSink will handle the prerolling correctly. This means that it will return gst.types.StateChangeReturn.Async from a state change to PAUSED until the first buffer arrives in this element. The base class will call the #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, #GstBaseSink will synchronise on the clock using the times returned from #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 #GstBaseSink:sync property to false.

After synchronisation the virtual method #GstBaseSinkClass::render will be called. Subclasses should minimally implement this method.

Subclasses that synchronise on the clock in the #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 gstbase.base_sink.BaseSink.waitPreroll to perform the blocking wait.

Upon receiving the EOS event in the PLAYING state, #GstBaseSink will wait for the clock to reach the time indicated by the stop time of the last #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.

#GstBaseSink will internally use the gst.types.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.

#GstBaseSink will by default report the current playback position in gst.types.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 #GstBaseSinkClass::set_caps function will be called when the subclass should configure itself to process a specific media type.

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

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

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

The #GstBaseSink: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 #GstBaseSinkClass::get_times method does not return a valid start time or max-lateness is set to -1 (the default). Subclasses can use gstbase.base_sink.BaseSink.setMaxLateness to configure the max-lateness value.

The #GstBaseSink: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 #GstBaseSink: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.

class BaseSink : Element {

gst.types.FlowReturn doPreroll(gst.mini_object.MiniObject obj);

uint getBlocksize();

bool getDropOutOfSegment();

gst.sample.Sample getLastSample();

gst.types.ClockTime getLatency();

ulong getMaxBitrate();

long getMaxLateness();

gst.types.ClockTime getProcessingDeadline();

gst.types.ClockTime getRenderDelay();

gst.structure.Structure getStats();

bool getSync();

ulong getThrottleTime();

gst.types.ClockTimeDiff getTsOffset();

bool isAsyncEnabled();

bool isLastSampleEnabled();

bool isQosEnabled();

bool queryLatency(bool live, bool upstreamLive, gst.types.ClockTime minLatency, gst.types.ClockTime maxLatency);

void setAsyncEnabled(bool enabled);

void setBlocksize(uint blocksize);

void setDropOutOfSegment(bool dropOutOfSegment);

void setLastSampleEnabled(bool enabled);

void setMaxBitrate(ulong maxBitrate);

void setMaxLateness(long maxLateness);

void setProcessingDeadline(gst.types.ClockTime processingDeadline);

void setQosEnabled(bool enabled);

void setRenderDelay(gst.types.ClockTime delay);

void setSync(bool sync);

void setThrottleTime(ulong throttle);

void setTsOffset(gst.types.ClockTimeDiff offset);

gst.types.FlowReturn wait(gst.types.ClockTime time, gst.types.ClockTimeDiff jitter);

gst.types.ClockReturn waitClock(gst.types.ClockTime time, gst.types.ClockTimeDiff jitter);

gst.types.FlowReturn waitPreroll();

}

Members

Functions

doPreroll gst.types.FlowReturn doPreroll(gst.mini_object.MiniObject obj): If the sink spawns its own thread for pulling buffers from upstream it should call this method after it has pulled a buffer. If the element needed to preroll, this function will perform the preroll and will then block until the element state is changed.
getBlocksize uint getBlocksize(): Get the number of bytes that the sink will pull when it is operating in pull mode.
getDropOutOfSegment bool getDropOutOfSegment(): Checks if sink is currently configured to drop buffers which are outside the current segment
getLastSample gst.sample.Sample getLastSample(): Get the last sample that arrived in the sink and was used for preroll or for rendering. This property can be used to generate thumbnails.
getLatency gst.types.ClockTime getLatency(): Get the currently configured latency.
getMaxBitrate ulong getMaxBitrate(): Get the maximum amount of bits per second that the sink will render.
getMaxLateness long getMaxLateness(): Gets the max lateness value. See gstbase.base_sink.BaseSink.setMaxLateness for more details.
getProcessingDeadline gst.types.ClockTime getProcessingDeadline(): Get the processing deadline of sink. see gstbase.base_sink.BaseSink.setProcessingDeadline for more information about the processing deadline.
getRenderDelay gst.types.ClockTime getRenderDelay(): Get the render delay of sink. see gstbase.base_sink.BaseSink.setRenderDelay for more information about the render delay.
getStats gst.structure.Structure getStats(): Return various #GstBaseSink statistics. This function returns a #GstStructure with name application/x-gst-base-sink-stats with the following fields:
getSync bool getSync(): Checks if sink is currently configured to synchronize against the clock.
getThrottleTime ulong getThrottleTime(): Get the time that will be inserted between frames to control the maximum buffers per second.
getTsOffset gst.types.ClockTimeDiff getTsOffset(): Get the synchronisation offset of sink.
isAsyncEnabled bool isAsyncEnabled(): Checks if sink is currently configured to perform asynchronous state changes to PAUSED.
isLastSampleEnabled bool isLastSampleEnabled(): Checks if sink is currently configured to store the last received sample in the last-sample property.
isQosEnabled bool isQosEnabled(): Checks if sink is currently configured to send Quality-of-Service events upstream.
queryLatency bool queryLatency(bool live, bool upstreamLive, gst.types.ClockTime minLatency, gst.types.ClockTime maxLatency): Query the sink for the latency parameters. The latency will be queried from the upstream elements. live will be true if sink is configured to synchronize against the clock. upstream_live will be true if an upstream element is live.
setAsyncEnabled void setAsyncEnabled(bool enabled): Configures sink to perform all state changes asynchronously. When async is disabled, the sink will immediately go to PAUSED instead of waiting for a preroll buffer. This feature is useful if the sink does not synchronize against the clock or when it is dealing with sparse streams.
setBlocksize void setBlocksize(uint blocksize): Set the number of bytes that the sink will pull when it is operating in pull mode.
setDropOutOfSegment void setDropOutOfSegment(bool dropOutOfSegment): Configure sink to drop buffers which are outside the current segment
setLastSampleEnabled void setLastSampleEnabled(bool enabled): Configures sink to store the last received sample in the last-sample property.
setMaxBitrate void setMaxBitrate(ulong maxBitrate): Set the maximum amount of bits per second that the sink will render.
setMaxLateness void setMaxLateness(long maxLateness): Sets the new max lateness value to max_lateness. This value is used to decide if a buffer should be dropped or not based on the buffer timestamp and the current clock time. A value of -1 means an unlimited time.
setProcessingDeadline void setProcessingDeadline(gst.types.ClockTime processingDeadline): Maximum amount of time (in nanoseconds) that the pipeline can take for processing the buffer. This is added to the latency of live pipelines.
setQosEnabled void setQosEnabled(bool enabled): Configures sink to send Quality-of-Service events upstream.
setRenderDelay void setRenderDelay(gst.types.ClockTime delay): Set the render delay in sink to delay. The render delay is the time between actual rendering of a buffer and its synchronisation time. Some devices might delay media rendering which can be compensated for with this function.
setSync void setSync(bool sync): Configures sink to synchronize on the clock or not. When sync is false, incoming samples will be played as fast as possible. If sync is true, the timestamps of the incoming buffers will be used to schedule the exact render time of its contents.
setThrottleTime void setThrottleTime(ulong throttle): Set the time that will be inserted between rendered buffers. This can be used to control the maximum buffers per second that the sink will render.
setTsOffset void setTsOffset(gst.types.ClockTimeDiff offset): Adjust the synchronisation of sink with offset. A negative value will render buffers earlier than their timestamp. A positive value will delay rendering. This function can be used to fix playback of badly timestamped buffers.
wait gst.types.FlowReturn wait(gst.types.ClockTime time, gst.types.ClockTimeDiff jitter): This function will wait for preroll to complete and will then block until time is reached. It is usually called by subclasses that use their own internal synchronisation but want to let some synchronization (like EOS) be handled by the base class.
waitClock gst.types.ClockReturn waitClock(gst.types.ClockTime time, gst.types.ClockTimeDiff jitter): This function will block until time is reached. It is usually called by subclasses that use their own internal synchronisation.
waitPreroll gst.types.FlowReturn waitPreroll(): If the #GstBaseSinkClass::render method performs its own synchronisation against the clock it must unblock when going from PLAYING to the PAUSED state and call this method before continuing to render the remaining data.

Inherited Members

From Element

makeFromUri gst.element.Element makeFromUri(gst.types.URIType type, string uri, string elementname): Creates an element for handling the given URI.
register bool register(gst.plugin.Plugin plugin, string name, uint rank, gobject.types.GType type): Create a new elementfactory capable of instantiating objects of the type and add the factory to plugin.
stateChangeReturnGetName string stateChangeReturnGetName(gst.types.StateChangeReturn stateRet): Gets a string representing the given state change result.
stateGetName string stateGetName(gst.types.State state): Gets a string representing the given state.
typeSetSkipDocumentation void typeSetSkipDocumentation(gobject.types.GType type): Marks type as "documentation should be skipped". Can be useful for dynamically registered element to be excluded from plugin documentation system.
abortState void abortState(): Abort the state change of the element. This function is used by elements that do asynchronous state changes and find out something is wrong.
addPad bool addPad(gst.pad.Pad pad): Adds a pad (link point) to element. pad's parent will be set to element; see gst.object.ObjectGst.setParent for refcounting information.
addPropertyDeepNotifyWatch gulong addPropertyDeepNotifyWatch(string propertyName, bool includeValue)
addPropertyNotifyWatch gulong addPropertyNotifyWatch(string propertyName, bool includeValue)
callAsync void callAsync(gst.types.ElementCallAsyncFunc func): Calls func from another thread and passes user_data to it. This is to be used for cases when a state change has to be performed from a streaming thread, directly via gst.element.Element.setState or indirectly e.g. via SEEK events.
changeState gst.types.StateChangeReturn changeState(gst.types.StateChange transition): Perform transition on element.
continueState gst.types.StateChangeReturn continueState(gst.types.StateChangeReturn ret): Commit the state change of the element and proceed to the next pending state if any. This function is used by elements that do asynchronous state changes. The core will normally call this method automatically when an element returned gst.types.StateChangeReturn.Success from the state change function.
createAllPads void createAllPads(): Creates a pad for each pad template that is always available. This function is only useful during object initialization of subclasses of #GstElement.
decorateStreamId string decorateStreamId(string streamId): Creates a stream-id for element by combining the upstream information with the stream_id.
foreachPad bool foreachPad(gst.types.ElementForeachPadFunc func): Call func with user_data for each of element's pads. func will be called exactly once for each pad that exists at the time of this call, unless one of the calls to func returns false in which case we will stop iterating pads and return early. If new pads are added or pads are removed while pads are being iterated, this will not be taken into account until next time this function is used.
foreachSinkPad bool foreachSinkPad(gst.types.ElementForeachPadFunc func): Call func with user_data for each of element's sink pads. func will be called exactly once for each sink pad that exists at the time of this call, unless one of the calls to func returns false in which case we will stop iterating pads and return early. If new sink pads are added or sink pads are removed while the sink pads are being iterated, this will not be taken into account until next time this function is used.
foreachSrcPad bool foreachSrcPad(gst.types.ElementForeachPadFunc func): Call func with user_data for each of element's source pads. func will be called exactly once for each source pad that exists at the time of this call, unless one of the calls to func returns false in which case we will stop iterating pads and return early. If new source pads are added or source pads are removed while the source pads are being iterated, this will not be taken into account until next time this function is used.
getBaseTime gst.types.ClockTime getBaseTime(): Returns the base time of the element. The base time is the absolute time of the clock when this element was last put to PLAYING. Subtracting the base time from the clock time gives the running time of the element.
getBus gst.bus.Bus getBus(): Returns the bus of the element. Note that only a #GstPipeline will provide a bus for the application.
getClock gst.clock.Clock getClock(): Gets the currently configured clock of the element. This is the clock as was last set with gst.element.Element.setClock.
getCompatiblePad gst.pad.Pad getCompatiblePad(gst.pad.Pad pad, gst.caps.Caps caps): Looks for an unlinked pad to which the given pad can link. It is not guaranteed that linking the pads will work, though it should work in most cases.
getCompatiblePadTemplate gst.pad_template.PadTemplate getCompatiblePadTemplate(gst.pad_template.PadTemplate compattempl): Retrieves a pad template from element that is compatible with compattempl. Pads from compatible templates can be linked together.
getContext gst.context.Context getContext(string contextType): Gets the context with context_type set on the element or NULL.
getContextUnlocked gst.context.Context getContextUnlocked(string contextType): Gets the context with context_type set on the element or NULL.
getContexts gst.context.Context[] getContexts(): Gets the contexts set on the element.
getCurrentClockTime gst.types.ClockTime getCurrentClockTime(): Returns the current clock time of the element, as in, the time of the element's clock, or GST_CLOCK_TIME_NONE if there is no clock.
getCurrentRunningTime gst.types.ClockTime getCurrentRunningTime(): Returns the running time of the element. The running time is the element's clock time minus its base time. Will return GST_CLOCK_TIME_NONE if the element has no clock, or if its base time has not been set.
getFactory gst.element_factory.ElementFactory getFactory(): Retrieves the factory that was used to create this element.
getMetadata string getMetadata(string key): Get metadata with key in klass.
getPadTemplate gst.pad_template.PadTemplate getPadTemplate(string name): Retrieves a padtemplate from element with the given name.
getPadTemplateList gst.pad_template.PadTemplate[] getPadTemplateList(): Retrieves a list of the pad templates associated with element. The list must not be modified by the calling code.
getRequestPad gst.pad.Pad getRequestPad(string name): The name of this function is confusing to people learning GStreamer. gst.element.Element.requestPadSimple aims at making it more explicit it is a simplified gst.element.Element.requestPad.
getStartTime gst.types.ClockTime getStartTime(): Returns the start time of the element. The start time is the running time of the clock when this element was last put to PAUSED.
getState gst.types.StateChangeReturn getState(gst.types.State state, gst.types.State pending, gst.types.ClockTime timeout): Gets the state of the element.
getStaticPad gst.pad.Pad getStaticPad(string name): Retrieves a pad from element by name. This version only retrieves already-existing (i.e. 'static') pads.
isLockedState bool isLockedState(): Checks if the state of an element is locked. If the state of an element is locked, state changes of the parent don't affect the element. This way you can leave currently unused elements inside bins. Just lock their state before changing the state from #GST_STATE_NULL.
iteratePads gst.iterator.Iterator iteratePads(): Retrieves an iterator of element's pads. The iterator should be freed after usage. Also more specialized iterators exists such as gst.element.Element.iterateSrcPads or gst.element.Element.iterateSinkPads.
iterateSinkPads gst.iterator.Iterator iterateSinkPads(): Retrieves an iterator of element's sink pads.
iterateSrcPads gst.iterator.Iterator iterateSrcPads(): Retrieves an iterator of element's source pads.
link bool link(gst.element.Element dest): Links src to dest. The link must be from source to destination; the other direction will not be tried. The function looks for existing pads that aren't linked yet. It will request new pads if necessary. Such pads need to be released manually when unlinking. If multiple links are possible, only one is established.
linkFiltered bool linkFiltered(gst.element.Element dest, gst.caps.Caps filter): Links src to dest using the given caps as filtercaps. The link must be from source to destination; the other direction will not be tried. The function looks for existing pads that aren't linked yet. It will request new pads if necessary. If multiple links are possible, only one is established.
linkPads bool linkPads(string srcpadname, gst.element.Element dest, string destpadname): Links the two named pads of the source and destination elements. Side effect is that if one of the pads has no parent, it becomes a child of the parent of the other element. If they have different parents, the link fails.
linkPadsFiltered bool linkPadsFiltered(string srcpadname, gst.element.Element dest, string destpadname, gst.caps.Caps filter): Links the two named pads of the source and destination elements. Side effect is that if one of the pads has no parent, it becomes a child of the parent of the other element. If they have different parents, the link fails. If caps is not null, makes sure that the caps of the link is a subset of caps.
linkPadsFull bool linkPadsFull(string srcpadname, gst.element.Element dest, string destpadname, gst.types.PadLinkCheck flags): Links the two named pads of the source and destination elements. Side effect is that if one of the pads has no parent, it becomes a child of the parent of the other element. If they have different parents, the link fails.
lostState void lostState(): Brings the element to the lost state. The current state of the element is copied to the pending state so that any call to gst.element.Element.getState will return gst.types.StateChangeReturn.Async.
messageFull void messageFull(gst.types.MessageType type, glib.types.Quark domain, int code, string text, string debug_, string file, string function_, int line): Post an error, warning or info message on the bus from inside an element.
messageFullWithDetails void messageFullWithDetails(gst.types.MessageType type, glib.types.Quark domain, int code, string text, string debug_, string file, string function_, int line, gst.structure.Structure structure): Post an error, warning or info message on the bus from inside an element.
noMorePads void noMorePads(): Use this function to signal that the element does not expect any more pads to show up in the current pipeline. This function should be called whenever pads have been added by the element itself. Elements with #GST_PAD_SOMETIMES pad templates use this in combination with autopluggers to figure out that the element is done initializing its pads.
postMessage bool postMessage(gst.message.Message message): Post a message on the element's #GstBus. This function takes ownership of the message; if you want to access the message after this call, you should add an additional reference before calling.
provideClock gst.clock.Clock provideClock(): Get the clock provided by the given element. > An element is only required to provide a clock in the PAUSED > state. Some elements can provide a clock in other states.
query bool query(gst.query.Query query): Performs a query on the given element.
queryConvert bool queryConvert(gst.types.Format srcFormat, long srcVal, gst.types.Format destFormat, long destVal): Queries an element to convert src_val in src_format to dest_format.
queryDuration bool queryDuration(gst.types.Format format, long duration): Queries an element (usually top-level pipeline or playbin element) for the total stream duration in nanoseconds. This query will only work once the pipeline is prerolled (i.e. reached PAUSED or PLAYING state). The application will receive an ASYNC_DONE message on the pipeline bus when that is the case.
queryPosition bool queryPosition(gst.types.Format format, long cur): Queries an element (usually top-level pipeline or playbin element) for the stream position in nanoseconds. This will be a value between 0 and the stream duration (if the stream duration is known). This query will usually only work once the pipeline is prerolled (i.e. reached PAUSED or PLAYING state). The application will receive an ASYNC_DONE message on the pipeline bus when that is the case.
releaseRequestPad void releaseRequestPad(gst.pad.Pad pad): Makes the element free the previously requested pad as obtained with gst.element.Element.requestPad.
removePad bool removePad(gst.pad.Pad pad): Removes pad from element. pad will be destroyed if it has not been referenced elsewhere using gst.object.ObjectGst.unparent.
removePropertyNotifyWatch void removePropertyNotifyWatch(gulong watchId)
requestPad gst.pad.Pad requestPad(gst.pad_template.PadTemplate templ, string name, gst.caps.Caps caps): Retrieves a request pad from the element according to the provided template. Pad templates can be looked up using gst.element_factory.ElementFactory.getStaticPadTemplates.
requestPadSimple gst.pad.Pad requestPadSimple(string name): Retrieves a pad from the element by name (e.g. "src_\d"). This version only retrieves request pads. The pad should be released with gst.element.Element.releaseRequestPad.
seek bool seek(double rate, gst.types.Format format, gst.types.SeekFlags flags, gst.types.SeekType startType, long start, gst.types.SeekType stopType, long stop): Sends a seek event to an element. See gst.event.Event.newSeek for the details of the parameters. The seek event is sent to the element using gst.element.Element.sendEvent.
seekSimple bool seekSimple(gst.types.Format format, gst.types.SeekFlags seekFlags, long seekPos): Simple API to perform a seek on the given element, meaning it just seeks to the given position relative to the start of the stream. For more complex operations like segment seeks (e.g. for looping) or changing the playback rate or seeking relative to the last configured playback segment you should use gst.element.Element.seek.
sendEvent bool sendEvent(gst.event.Event event): Sends an event to an element. If the element doesn't implement an event handler, the event will be pushed on a random linked sink pad for downstream events or a random linked source pad for upstream events.
setBaseTime void setBaseTime(gst.types.ClockTime time): Set the base time of an element. See gst.element.Element.getBaseTime.
setBus void setBus(gst.bus.Bus bus): Sets the bus of the element. Increases the refcount on the bus. For internal use only, unless you're testing elements.
setClock bool setClock(gst.clock.Clock clock): Sets the clock for the element. This function increases the refcount on the clock. Any previously set clock on the object is unreffed.
setContext void setContext(gst.context.Context context): Sets the context of the element. Increases the refcount of the context.
setLockedState bool setLockedState(bool lockedState): Locks the state of an element, so state changes of the parent don't affect this element anymore.
setStartTime void setStartTime(gst.types.ClockTime time): Set the start time of an element. The start time of the element is the running time of the element when it last went to the PAUSED state. In READY or after a flushing seek, it is set to 0.
setState gst.types.StateChangeReturn setState(gst.types.State state): Sets the state of the element. This function will try to set the requested state by going through all the intermediary states and calling the class's state change function for each.
syncStateWithParent bool syncStateWithParent(): Tries to change the state of the element to the same as its parent. If this function returns false, the state of element is undefined.
unlink void unlink(gst.element.Element dest): Unlinks all source pads of the source element with all sink pads of the sink element to which they are linked.
unlinkPads void unlinkPads(string srcpadname, gst.element.Element dest, string destpadname): Unlinks the two named pads of the source and destination elements.
connectNoMorePads ulong connectNoMorePads(T callback, Flag!"After" after): Connect to NoMorePads signal.
connectPadAdded ulong connectPadAdded(T callback, Flag!"After" after): Connect to PadAdded signal.
connectPadRemoved ulong connectPadRemoved(T callback, Flag!"After" after): Connect to PadRemoved signal.

gstbase base_sink classes

BaseSink