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GstGLUtils

GstGLUtils — some miscellaneous utilities for OpenGL

Description

Functions

gst_gl_handle_set_context ()

gboolean
gst_gl_handle_set_context (GstElement *element,
                           GstContext *context,
                           GstGLDisplay **display,
                           GstGLContext **other_context);

Helper function for implementing GstElement::set_context() in OpenGL capable elements.

Retrieve's the GstGLDisplay or GstGLContext in context and places the result in display or other_context respectively.

Parameters

element

a GstElement

 

context

a GstContext

 

display

location of a GstGLDisplay.

[inout][transfer full]

other_context

location of a GstGLContext.

[inout][transfer full]

Returns

whether the display or other_context could be set successfully


gst_gl_handle_context_query ()

gboolean
gst_gl_handle_context_query (GstElement *element,
                             GstQuery *query,
                             GstGLDisplay *display,
                             GstGLContext *context,
                             GstGLContext *other_context);

Parameters

element

a GstElement

 

query

a GstQuery of type GST_QUERY_CONTEXT

 

display

a GstGLDisplay.

[transfer none][nullable]

context

a GstGLContext.

[transfer none][nullable]

other_context

application provided GstGLContext.

[transfer none][nullable]

Returns

Whether the query was successfully responded to from the passed display , context , and other_context .


gst_gl_ensure_element_data ()

gboolean
gst_gl_ensure_element_data (gpointer element,
                            GstGLDisplay **display_ptr,
                            GstGLContext **other_context_ptr);

Perform the steps necessary for retrieving a GstGLDisplay and (optionally) an application provided GstGLContext from the surrounding elements or from the application using the GstContext mechanism.

If the contents of display_ptr or other_context_ptr are not NULL, then no GstContext query is necessary for GstGLDisplay or GstGLContext retrieval or is performed.

This performs GstContext queries (if necessary) for a winsys display connection with GST_GL_DISPLAY_CONTEXT_TYPE, "gst.x11.display.handle", and "GstWaylandDisplayHandleContextType" stopping after the first successful retrieval.

This also performs a GstContext query (if necessary) for an optional application provided GstGLContext using the name "gst.gl.app_context". The returned GstGLContext will be shared with a GStreamer created OpenGL context.

Parameters

element

the GstElement running the query

 

display_ptr

the resulting GstGLDisplay.

[inout]

other_context_ptr

the resulting GstGLContext.

[inout]

Returns

whether a GstGLDisplay exists in display_ptr


gst_gl_query_local_gl_context ()

gboolean
gst_gl_query_local_gl_context (GstElement *element,
                               GstPadDirection direction,
                               GstGLContext **context_ptr);

Performs a GST_QUERY_CONTEXT query of type "gst.gl.local_context" on all GstPads in element of direction for the local OpenGL context used by GStreamer elements.

Parameters

element

a GstElement to query from

 

direction

the GstPadDirection to query

 

context_ptr

location containing the current and/or resulting GstGLContext.

[inout]

Returns

whether context_ptr contains a GstGLContext


gst_gl_get_plane_data_size ()

gsize
gst_gl_get_plane_data_size (GstVideoInfo *info,
                            GstVideoAlignment *align,
                            guint plane);

Retrieve the size in bytes of a video plane of data with a certain alignment

Parameters

info

a GstVideoInfo

 

align

a GstVideoAlignment or NULL

 

plane

plane number in info to retrieve the data size of

 

gst_gl_get_plane_start ()

gsize
gst_gl_get_plane_start (GstVideoInfo *info,
                        GstVideoAlignment *valign,
                        guint plane);

Parameters

info

a GstVideoInfo

 

valign

a GstVideoAlignment or NULL

 

plane

plane number in info to retrieve the data size of

 

Returns

difference between the supposed start of the plane from the info and where the data from the previous plane ends.


gst_gl_value_get_texture_target_mask ()

GstGLTextureTarget
gst_gl_value_get_texture_target_mask (const GValue *value);

See gst_gl_value_set_texture_target_from_mask() for what entails a mask

Parameters

value

an initialized GValue of type G_TYPE_STRING

 

Returns

the mask of GstGLTextureTarget's in value


gst_gl_value_set_texture_target ()

gboolean
gst_gl_value_set_texture_target (GValue *value,
                                 GstGLTextureTarget target);

Parameters

value

an initialized GValue of type G_TYPE_STRING

 

target

a GstGLTextureTarget's

 

Returns

whether the target could be set on value


gst_gl_value_set_texture_target_from_mask ()

gboolean
gst_gl_value_set_texture_target_from_mask
                               (GValue *value,
                                GstGLTextureTarget target_mask);

A mask is a bitwise OR of (1 << target) where target is a valid GstGLTextureTarget

Parameters

value

an uninitialized GValue

 

target_mask

a bitwise mask of GstGLTextureTarget's

 

Returns

whether the target_mask could be set on value


gst_gl_check_extension ()

gboolean
gst_gl_check_extension (const char *name,
                        const gchar *ext);

Parameters

name

the extension to search for

 

ext

the list of possible extensions

 

Returns

whether name is in the space seperated list of ext

Types and Values

See Also

GstGLContext

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