GstVaPool

GstVaPool is a buffer pool for VA allocators.

VaPool

GObject
    ╰──GInitiallyUnowned
        ╰──GstObject
            ╰──GstBufferPool
                ╰──VaPool

A buffer pool that uses either VaAllocator or VaDmabufAllocator to pre-allocate and recycle GstBuffer.


VaPool

GObject.Object
    ╰──GObject.InitiallyUnowned
        ╰──Gst.Object
            ╰──Gst.BufferPool
                ╰──VaPool

A buffer pool that uses either VaAllocator or VaDmabufAllocator to pre-allocate and recycle Gst.Buffer.


VaPool

GObject.Object
    ╰──GObject.InitiallyUnowned
        ╰──Gst.Object
            ╰──Gst.BufferPool
                ╰──VaPool

A buffer pool that uses either VaAllocator or VaDmabufAllocator to pre-allocate and recycle Gst.Buffer.


Constructors

gst_va_pool_new

GstBufferPool *
gst_va_pool_new ()
Returns

A new GstBufferPool for VA allocators.

Since : 1.22


GstVa.VaPool.prototype.new

function GstVa.VaPool.prototype.new(): {
    // javascript wrapper for 'gst_va_pool_new'
}
Returns (Gst.BufferPool)

A new Gst.BufferPool for VA allocators.

Since : 1.22


GstVa.VaPool.new

def GstVa.VaPool.new ():
    #python wrapper for 'gst_va_pool_new'
Returns (Gst.BufferPool)

A new Gst.BufferPool for VA allocators.

Since : 1.22


gst_va_pool_new_with_config

GstBufferPool *
gst_va_pool_new_with_config (GstCaps * caps,
                             guint size,
                             guint min_buffers,
                             guint max_buffers,
                             guint usage_hint,
                             GstVaFeature use_derived,
                             GstAllocator * allocator,
                             GstAllocationParams * alloc_params)

Parameters:

caps

the GstCaps of the buffers handled by the new pool.

size

the size of the frames to hold.

min_buffers

minimum number of frames to create.

max_buffers

maximum number of frames to create.

usage_hint

VA usage hint

use_derived

a GstVaFeature for derived mapping (only used when VA allocator).

allocator

the VA allocator to use.

alloc_params

GstAllocationParams to use.

Returns

a new GstBufferPool that handles VASurfacesID-backed buffers. If the pool cannot be configured correctly, NULL is returned.

Since : 1.22


GstVa.VaPool.prototype.new_with_config

function GstVa.VaPool.prototype.new_with_config(caps: Gst.Caps, size: Number, min_buffers: Number, max_buffers: Number, usage_hint: Number, use_derived: GstVa.VaFeature, allocator: Gst.Allocator, alloc_params: Gst.AllocationParams): {
    // javascript wrapper for 'gst_va_pool_new_with_config'
}

Parameters:

caps (Gst.Caps)

the Gst.Caps of the buffers handled by the new pool.

size (Number)

the size of the frames to hold.

min_buffers (Number)

minimum number of frames to create.

max_buffers (Number)

maximum number of frames to create.

usage_hint (Number)

VA usage hint

use_derived (GstVa.VaFeature)

a GstVa.VaFeature for derived mapping (only used when VA allocator).

allocator (Gst.Allocator)

the VA allocator to use.

alloc_params (Gst.AllocationParams)

Gst.AllocationParams to use.

Returns (Gst.BufferPool)

a new Gst.BufferPool that handles VASurfacesID-backed buffers. If the pool cannot be configured correctly, null is returned.

Since : 1.22


GstVa.VaPool.new_with_config

def GstVa.VaPool.new_with_config (caps, size, min_buffers, max_buffers, usage_hint, use_derived, allocator, alloc_params):
    #python wrapper for 'gst_va_pool_new_with_config'

Parameters:

caps (Gst.Caps)

the Gst.Caps of the buffers handled by the new pool.

size (int)

the size of the frames to hold.

min_buffers (int)

minimum number of frames to create.

max_buffers (int)

maximum number of frames to create.

usage_hint (int)

VA usage hint

use_derived (GstVa.VaFeature)

a GstVa.VaFeature for derived mapping (only used when VA allocator).

allocator (Gst.Allocator)

the VA allocator to use.

alloc_params (Gst.AllocationParams)

Gst.AllocationParams to use.

Returns (Gst.BufferPool)

a new Gst.BufferPool that handles VASurfacesID-backed buffers. If the pool cannot be configured correctly, None is returned.

Since : 1.22


Functions

gst_va_pool_requires_video_meta

gboolean
gst_va_pool_requires_video_meta (GstBufferPool * pool)

Retuns: TRUE if pool always add GstVideoMeta to its buffers. Otherwise, FALSE.

Parameters:

pool

the GstBufferPool

Returns
No description available

Since : 1.22


GstVa.VaPool.prototype.requires_video_meta

function GstVa.VaPool.prototype.requires_video_meta(pool: Gst.BufferPool): {
    // javascript wrapper for 'gst_va_pool_requires_video_meta'
}

Retuns: true if pool always add GstVideo.VideoMeta to its buffers. Otherwise, false.

Parameters:

Returns (Number)
No description available

Since : 1.22


GstVa.VaPool.requires_video_meta

def GstVa.VaPool.requires_video_meta (pool):
    #python wrapper for 'gst_va_pool_requires_video_meta'

Retuns: True if pool always add GstVideo.VideoMeta to its buffers. Otherwise, False.

Parameters:

Returns (bool)
No description available

Since : 1.22


Functions

gst_buffer_pool_config_set_va_alignment

gst_buffer_pool_config_set_va_alignment (GstStructure * config,
                                         const GstVideoAlignment * align)

Video alignment is not handled as expected by VA since it uses opaque surfaces, not directly mappable memory. Still, decoders might need to request bigger surfaces for coded size rather than display sizes. This method will set the coded size to bufferpool's configuration, out of the typical video aligment.

Parameters:

config

the GstStructure with the pool's configuration.

align

a GstVideoAlignment

Since : 1.20.2


GstVa.prototype.buffer_pool_config_set_va_alignment

function GstVa.prototype.buffer_pool_config_set_va_alignment(config: Gst.Structure, align: GstVideo.VideoAlignment): {
    // javascript wrapper for 'gst_buffer_pool_config_set_va_alignment'
}

Video alignment is not handled as expected by VA since it uses opaque surfaces, not directly mappable memory. Still, decoders might need to request bigger surfaces for coded size rather than display sizes. This method will set the coded size to bufferpool's configuration, out of the typical video aligment.

Parameters:

config (Gst.Structure)

the Gst.Structure with the pool's configuration.

Since : 1.20.2


GstVa.buffer_pool_config_set_va_alignment

def GstVa.buffer_pool_config_set_va_alignment (config, align):
    #python wrapper for 'gst_buffer_pool_config_set_va_alignment'

Video alignment is not handled as expected by VA since it uses opaque surfaces, not directly mappable memory. Still, decoders might need to request bigger surfaces for coded size rather than display sizes. This method will set the coded size to bufferpool's configuration, out of the typical video aligment.

Parameters:

config (Gst.Structure)

the Gst.Structure with the pool's configuration.

Since : 1.20.2


gst_buffer_pool_config_set_va_allocation_params

gst_buffer_pool_config_set_va_allocation_params (GstStructure * config,
                                                 guint usage_hint,
                                                 GstVaFeature use_derived)

Sets the usage hint for the buffers handled by the buffer pool.

Parameters:

config

the GstStructure with the pool's configuration.

usage_hint

the VA usage hint for new VASurfaceID.

use_derived

a GstVaFeature for derived mapping (only used when VA allocator).

Since : 1.22


GstVa.prototype.buffer_pool_config_set_va_allocation_params

function GstVa.prototype.buffer_pool_config_set_va_allocation_params(config: Gst.Structure, usage_hint: Number, use_derived: GstVa.VaFeature): {
    // javascript wrapper for 'gst_buffer_pool_config_set_va_allocation_params'
}

Sets the usage hint for the buffers handled by the buffer pool.

Parameters:

config (Gst.Structure)

the Gst.Structure with the pool's configuration.

usage_hint (Number)

the VA usage hint for new VASurfaceID.

use_derived (GstVa.VaFeature)

a GstVa.VaFeature for derived mapping (only used when VA allocator).

Since : 1.22


GstVa.buffer_pool_config_set_va_allocation_params

def GstVa.buffer_pool_config_set_va_allocation_params (config, usage_hint, use_derived):
    #python wrapper for 'gst_buffer_pool_config_set_va_allocation_params'

Sets the usage hint for the buffers handled by the buffer pool.

Parameters:

config (Gst.Structure)

the Gst.Structure with the pool's configuration.

usage_hint (int)

the VA usage hint for new VASurfaceID.

use_derived (GstVa.VaFeature)

a GstVa.VaFeature for derived mapping (only used when VA allocator).

Since : 1.22


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