Package org.freedesktop.gstreamer.video

Class VideoAggregator

java.lang.Object

org.javagi.base.ProxyInstance

org.gnome.gobject.TypeInstance

org.gnome.gobject.GObject

org.gnome.gobject.InitiallyUnowned

org.freedesktop.gstreamer.gst.GstObject

org.freedesktop.gstreamer.gst.Element

org.freedesktop.gstreamer.base.Aggregator

org.freedesktop.gstreamer.video.VideoAggregator

All Implemented Interfaces:

Proxy

Direct Known Subclasses:

VideoAggregator.VideoAggregator$Impl

@Generated("io.github.jwharm.JavaGI")
public abstract class VideoAggregator
extends Aggregator

VideoAggregator can accept AYUV, ARGB and BGRA video streams. For each of the requested sink pads it will compare the incoming geometry and framerate to define the output parameters. Indeed output video frames will have the geometry of the biggest incoming video stream and the framerate of the fastest incoming one.

VideoAggregator will do colorspace conversion.

Zorder for each input stream can be configured on the GstVideoAggregatorPad.

Since:

1.16

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	VideoAggregator.Builder<B extends VideoAggregator.Builder<B>>	Inner class implementing a builder pattern to construct a GObject with properties.
static class	VideoAggregator.VideoAggregator$Impl	The VideoAggregator$Impl type represents a native instance of the abstract VideoAggregator class.
static class	VideoAggregator.VideoAggregatorClass

Nested classes/interfaces inherited from class org.freedesktop.gstreamer.base.Aggregator

Aggregator.Aggregator$Impl, Aggregator.AggregatorClass, Aggregator.SamplesSelectedCallback

Nested classes/interfaces inherited from class org.freedesktop.gstreamer.gst.Element

Element.Element$Impl, Element.ElementClass, Element.NoMorePadsCallback, Element.PadAddedCallback, Element.PadRemovedCallback

Nested classes/interfaces inherited from class org.freedesktop.gstreamer.gst.GstObject

GstObject.DeepNotifyCallback, GstObject.Object$Impl, GstObject.ObjectClass

Nested classes/interfaces inherited from class org.gnome.gobject.InitiallyUnowned

InitiallyUnowned.InitiallyUnownedClass

Nested classes/interfaces inherited from class org.gnome.gobject.GObject

GObject.NotifyCallback

Constructor Summary

Constructors

Constructor	Description
VideoAggregator()	Creates a new VideoAggregator.
VideoAggregator(MemorySegment address)	Create a VideoAggregator proxy instance for the provided memory address.

Method Summary

Modifier and Type	Method	Description
protected FlowReturn	aggregateFrames(Buffer outbuffer)	Lets subclasses aggregate frames that are ready.
protected VideoAggregator	asParent()	Returns this instance as if it were its parent type.
protected FlowReturn	createOutputBuffer(Buffer[] outbuffer)	Optional.
protected void	findBestFormat(Caps downstreamCaps, VideoInfo bestInfo, Out<Boolean> atLeastOneAlpha)
TaskPool	getExecutionTaskPool()	The returned GstTaskPool is used internally for performing parallel video format conversions/scaling/etc during the GstVideoAggregatorPadClass::prepare_frame_start() process.
static MemoryLayout	getMemoryLayout()	The memory layout of the native struct.
static @Nullable Type	getType()	Get the GType of the VideoAggregator class
protected Caps	updateCaps(Caps caps)	Optional.

Methods inherited from class org.freedesktop.gstreamer.base.Aggregator

aggregate, clip, createNewPad, decideAllocation, emitSamplesSelected, finishBuffer, finishBufferList, fixateSrcCaps, flush, getAllocator, getBufferPool, getForceLive, getIgnoreInactivePads, getLatency, getNextTime, negotiate, negotiatedSrcCaps, onSamplesSelected, peekNextSample, proposeAllocation, pushSrcEvent, selectedSamples, setForceLive, setIgnoreInactivePads, setLatency, setSrcCaps, simpleGetNextTime, sinkEvent, sinkEventPreQueue, sinkQuery, sinkQueryPreQueue, srcActivate, srcEvent, srcQuery, start, stop, updateSegment, updateSrcCaps

Methods inherited from class org.freedesktop.gstreamer.gst.Element

abortState, addPad, addPropertyDeepNotifyWatch, addPropertyNotifyWatch, callAsync, changeState, continueState, createAllPads, decorateStreamId, decorateStreamIdPrintf, emitNoMorePads, emitPadAdded, emitPadRemoved, foreachPad, foreachSinkPad, foreachSrcPad, getBaseTime, getBus, getClock, getCompatiblePad, getCompatiblePadTemplate, getContext, getContexts, getContextUnlocked, getCurrentClockTime, getCurrentRunningTime, getFactory, getMetadata, getPadTemplate, getPadTemplateList, getRequestPad, getStartTime, getState, getStaticPad, isLockedState, iteratePads, iterateSinkPads, iterateSrcPads, link, linkFiltered, linkMany, linkPads, linkPadsFiltered, linkPadsFull, linkPadsFull, lostState, makeFromUri, messageFull, messageFull, messageFullWithDetails, messageFullWithDetails, noMorePads, onNoMorePads, onPadAdded, onPadRemoved, padAdded, padRemoved, postMessage, provideClock, query, queryConvert, queryDuration, queryPosition, register, releasePad, releaseRequestPad, removePad, removePropertyNotifyWatch, requestPad, requestPadSimple, seek, seek, seekSimple, seekSimple, sendEvent, setBaseTime, setBus, setClock, setContext, setLockedState, setStartTime, setState, stateChanged, stateChangeReturnGetName, stateGetName, syncStateWithParent, typeSetSkipDocumentation, unlink, unlinkMany, unlinkPads

Methods inherited from class org.freedesktop.gstreamer.gst.GstObject

addControlBinding, checkUniqueness, deepNotify, defaultDeepNotify, defaultError, emitDeepNotify, getControlBinding, getControlRate, getGValueArray, getName, getParent, getPathString, getValue, getValueArray, hasActiveControlBindings, hasAncestor, hasAsAncestor, hasAsParent, onDeepNotify, ref, refSink, removeControlBinding, replace, setControlBindingDisabled, setControlBindingsDisabled, setControlRate, setName, setParent, suggestNextSync, syncValues, unparent, unref

Methods inherited from class org.gnome.gobject.InitiallyUnowned

builder

Methods inherited from class org.gnome.gobject.GObject

addToggleRef, addWeakPointer, bindProperty, bindProperty, bindProperty, bindPropertyFull, bindPropertyFull, bindPropertyWithClosures, bindPropertyWithClosures, compatControl, connect, connect, connect, constructed, disconnect, dispatchPropertiesChanged, dispose, dupData, dupQdata, emit, emitNotify, finalize_, forceFloating, freezeNotify, get, getData, getProperty, getProperty, getProperty, getQdata, getv, interfaceFindProperty, interfaceInstallProperty, interfaceListProperties, isFloating, newInstance, newInstance, newv, notify, notify, notifyByPspec, onNotify, refSink, removeToggleRef, removeWeakPointer, replaceData, replaceQdata, runDispose, set, setData, setDataFull, setProperty, setProperty, setProperty, setQdata, setQdataFull, setv, stealData, stealQdata, takeRef, thawNotify, watchClosure, weakRef, weakUnref, withProperties

Methods inherited from class org.gnome.gobject.TypeInstance

callParent, callParent, cast, getPrivate, readGClass, writeGClass

Methods inherited from class org.javagi.base.ProxyInstance

equals, handle, hashCode

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Details

VideoAggregator

public VideoAggregator(MemorySegment address)

Create a VideoAggregator proxy instance for the provided memory address.

Parameters:

address - the memory address of the native object

VideoAggregator

public VideoAggregator()

Creates a new VideoAggregator.

Method Details

getType

public static @Nullable Type getType()

Get the GType of the VideoAggregator class

Returns:

the GType

getMemoryLayout

public static MemoryLayout getMemoryLayout()

The memory layout of the native struct.

Returns:

the memory layout

asParent

protected VideoAggregator asParent()

Returns this instance as if it were its parent type. This is mostly synonymous to the Java super keyword, but will set the native typeclass function pointers to the parent type. When overriding a native virtual method in Java, "chaining up" with super.methodName() doesn't work, because it invokes the overridden function pointer again. To chain up, call asParent().methodName(). This will call the native function pointer of this virtual method in the typeclass of the parent type.

Overrides:

asParent in class Aggregator

getExecutionTaskPool

public TaskPool getExecutionTaskPool()

The returned GstTaskPool is used internally for performing parallel video format conversions/scaling/etc during the GstVideoAggregatorPadClass::prepare_frame_start() process. Subclasses can add their own operation to perform using the returned GstTaskPool during GstVideoAggregatorClass::aggregate_frames().

Returns:

the GstTaskPool that can be used by subclasses for performing concurrent operations

Since:

1.20

aggregateFrames

protected FlowReturn aggregateFrames(Buffer outbuffer)

Lets subclasses aggregate frames that are ready. Subclasses should iterate the GstElement.sinkpads and use the already mapped GstVideoFrame from gst_video_aggregator_pad_get_prepared_frame() or directly use the GstBuffer from gst_video_aggregator_pad_get_current_buffer() if it needs to map the buffer in a special way. The result of the aggregation should land in outbuffer.

createOutputBuffer

protected FlowReturn createOutputBuffer(Buffer[] outbuffer)

Optional. Lets subclasses provide a GstBuffer to be used as outbuffer of the aggregate_frames vmethod.

findBestFormat

protected void findBestFormat(Caps downstreamCaps,
 VideoInfo bestInfo,
 Out<Boolean> atLeastOneAlpha)

updateCaps

protected Caps updateCaps(Caps caps)

Optional. Lets subclasses update the GstCaps representing the src pad caps before usage. Return null to indicate failure.