Package org.freedesktop.gstreamer.app

Interface AppSink.TryPullPrerollCallback

All Superinterfaces:

FunctionPointer

Enclosing class:

AppSink

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public static interface AppSink.TryPullPrerollCallback
extends FunctionPointer

Functional interface declaration of the TryPullPrerollCallback callback.

See Also:

• run(long)

Method Summary

Modifier and Type	Method	Description
Sample	run(long timeout)	Get the last preroll sample in appsink. This was the sample that caused the appsink to preroll in the PAUSED state.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, long) method.
default MemorySegment	upcall(MemorySegment sourceAppSink, long timeout)	The upcall method is called from native code.

Method Details

run

Sample run(long timeout)

Get the last preroll sample in appsink. This was the sample that caused the appsink to preroll in the PAUSED state.

This function is typically used when dealing with a pipeline in the PAUSED state. Calling this function after doing a seek will give the sample right after the seek position.

Calling this function will clear the internal reference to the preroll buffer.

Note that the preroll sample will also be returned as the first sample when calling gst_app_sink_pull_sample() or the "pull-sample" action signal.

If an EOS event was received before any buffers or the timeout expires, this function returns null. Use gst_app_sink_is_eos () to check for the EOS condition.

This function blocks until a preroll sample or EOS is received, the appsink element is set to the READY/NULL state, or the timeout expires.

Since:

1.10

upcall

default MemorySegment upcall(MemorySegment sourceAppSink,
 long timeout)

The upcall method is called from native code. The parameters are marshaled and run(long) is executed.

toCallback

default MemorySegment toCallback(Arena arena)

Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, long) method.

Specified by:

toCallback in interface FunctionPointer

Parameters:

arena - the arena in which the function pointer is allocated

Returns:

the native function pointer