GstDRMDumbAllocator

GstDRMDumbAllocator 

GObject
    ╰──GInitiallyUnowned
        ╰──GstObject
            ╰──GstAllocator
                ╰──GstDRMDumbAllocator

Private intance object for GstDRMDumbAllocator.

Since : 1.24

Class structure

GstDRMDumbAllocatorClass

Fields
parent_class (GstAllocatorClass) –

Parent Class.

Constructors

gst_drm_dumb_allocator_new_with_device_path 

GstAllocator *
gst_drm_dumb_allocator_new_with_device_path (const gchar * drm_device_path)

Creates a new GstDRMDumbAllocator for the specific device path. This function can fail if the path does not exist, is not a DRM device or if the DRM device doesnot support DUMB allocation.

Parameters:

drm_device_path ( [typefilename]) –

path to the DRM device to open

Returns ( [transfer: full][nullable]) –

a new DRM Dumb allocator. Use gst_object_unref to release the allocator after usage.

Since : 1.24

gst_drm_dumb_allocator_new_with_fd 

GstAllocator *
gst_drm_dumb_allocator_new_with_fd (gint drm_fd)

Creates a new GstDRMDumbAllocator for the specific file desciptor. This function can fail if the file descriptor is not a DRM device or if the DRM device does not support DUMB allocation.

Parameters:

drm_fd –

file descriptor of the DRM device

Returns ( [transfer: full][nullable]) –

a new DRM Dumb allocator. Use gst_object_unref to release the allocator after usage.

Since : 1.24

Methods

gst_drm_dumb_allocator_alloc 

GstMemory *
gst_drm_dumb_allocator_alloc (GstAllocator * allocator,
                              guint32 drm_fourcc,
                              guint32 width,
                              guint32 height,
                              guint32 * out_pitch)

Allocated a DRM buffer object for the specific drm_fourcc, width and height. Note that the DRM Dumb allocation interface is agnostic to the pixel format. This drm_fourcc is converted into a bpp (bit-per-pixel) number and the height is scaled according to the sub-sampling.

Parameters:

allocator ( [typeGstAllocators.DRMDumbAllocator]) –

the allocator instance

drm_fourcc –

the DRM format to allocate for

width –

padded width for this allocation

height –

padded height for this allocation

out_pitch ( [out]) –

the pitch as returned by the driver

Returns ( [transfer: full]) –

a new DRM Dumb GstMemory. Use gst_memory_unref to release the memory after usage.

Since : 1.24

gst_drm_dumb_allocator_has_prime_export 

gboolean
gst_drm_dumb_allocator_has_prime_export (GstAllocator * allocator)

This function allow verifying if the driver support dma-buf exportation.

Parameters:

allocator ( [typeGstAllocators.DRMDumbAllocator]) –

the GstAllocator

Returns –

TRUE if the allocator support exporting dma-buf.

Since : 1.24

Properties

drm-device-path 

“drm-device-path” gchar *

Flags : Read / Write / Construct Only

Since : 1.24

drm-fd 

“drm-fd” gint

Flags : Read / Write / Construct Only

Since : 1.24

Functions

gst_drm_dumb_memory_export_dmabuf 

GstMemory *
gst_drm_dumb_memory_export_dmabuf (GstMemory * mem)

Exports a DMABuf from the DRM Bumb buffer object. One can check if this feature is supported using gst_drm_dumb_allocator_has_prime_export;

Parameters:

mem –

the memory to export from

Returns –

a GstMemory from GstDmaBufAllocator wrapping the exported dma-buf file descriptor.

Since : 1.24

gst_drm_dumb_memory_get_handle 

guint32
gst_drm_dumb_memory_get_handle (GstMemory * mem)

Return the DRM buffer object handle associated with mem.

Parameters:

mem –

the memory to get the handle from

Returns –

the DRM buffer object handle associated with the memory, or 0. The handle is still owned by the GstMemory and cannot be used beyond the lifetime of this GstMemory unless it is being passed to DRM driver, which does handle a refcount internally.

Since : 1.24

gst_is_drm_dumb_memory 

gboolean
gst_is_drm_dumb_memory (GstMemory * mem)

Parameters:

mem –

the memory to be checked

Returns –

TRUE if mem is DRM Dumb memory, otherwise FALSE

Since : 1.24

Constants

GST_TYPE_DRM_DUMB_ALLOCATOR 

#define GST_TYPE_DRM_DUMB_ALLOCATOR gst_drm_dumb_allocator_get_type ()

Macro that returns the GstDRMDumbAllocator type.

Since : 1.24

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