GstAllocators.ShmAllocator¶

Subclasses:: None

Methods¶

Inherited:: GstAllocators.FdAllocator (2), Gst.Allocator (5), Gst.Object (27), GObject.Object (37)
Structs:: GObject.ObjectClass (5)

class	`get` ()
class	`init_once` ()

Virtual Methods¶

Inherited:: Gst.Allocator (2), Gst.Object (1), GObject.Object (7)

Properties¶

Inherited:: Gst.Object (2)

Signals¶

Inherited:: Gst.Object (1), GObject.Object (1)

Fields¶

Inherited:: Gst.Object (1), GObject.Object (1)

Class Details¶

class GstAllocators.ShmAllocator(**kwargs)¶

Bases:: GstAllocators.FdAllocator
Abstract:: No
Structure:: GstAllocators.ShmAllocatorClass

This is a subclass of GstAllocators.FdAllocator that implements the Gst.Allocator.alloc() method using memfd_create() when available, POSIX shm_open() otherwise. Platforms not supporting any of those (Windows) will always return None.

Note that allocating new shared memories has a significant performance cost, it is thus recommended to keep a pool of pre-allocated Gst.Memory, using Gst.BufferPool. For that reason, this allocator has the Gst.AllocatorFlags.NO_COPY flag set.

New in version 1.24.

classmethod get()[source]¶

Returns:: a Gst.Allocator or None if GstAllocators.ShmAllocator.init_once() has not been previously called.
Return type:: Gst.Allocator or None

Get the GstAllocators.ShmAllocator singleton previously registered with GstAllocators.ShmAllocator.init_once().

New in version 1.24.

classmethod init_once()[source]¶: Register a GstAllocators.ShmAllocator using Gst.Allocator.register() with the name GstAllocators.ALLOCATOR_SHM. This is no-op after the first call.

New in version 1.24.