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GstGLSyncMeta

GstGLSyncMeta — synchronization primitives

Types and Values

Description

GstGLSyncMeta provides the ability to synchronize the OpenGL command stream with the CPU or with other OpenGL contexts.

Functions

gst_gl_sync_meta_get_info ()

const GstMetaInfo *
gst_gl_sync_meta_get_info (void);

gst_buffer_add_gl_sync_meta ()

GstGLSyncMeta *
gst_buffer_add_gl_sync_meta (GstGLContext *context,
                             GstBuffer *buffer);

Parameters

context

a GstGLContext

 

buffer

a GstBuffer

 

Returns

the GstGLSyncMeta added to GstBuffer.

[transfer none]

Since: 1.6


gst_buffer_add_gl_sync_meta_full ()

GstGLSyncMeta *
gst_buffer_add_gl_sync_meta_full (GstGLContext *context,
                                  GstBuffer *buffer,
                                  gpointer data);

Parameters

context

a GstGLContext

 

buffer

a GstBuffer

 

data

sync data to hold

 

Returns

the GstGLSyncMeta added to GstBuffer.

[transfer none]

Since: 1.8


gst_buffer_get_gl_sync_meta()

#define gst_buffer_get_gl_sync_meta(b) ((GstGLSyncMeta*)gst_buffer_get_meta((b),GST_GL_SYNC_META_API_TYPE))

gst_gl_sync_meta_set_sync_point ()

void
gst_gl_sync_meta_set_sync_point (GstGLSyncMeta *sync_meta,
                                 GstGLContext *context);

Set a sync point to possibly wait on at a later time.

Parameters

sync_meta

a GstGLSyncMeta

 

context

a GstGLContext

 

Since: 1.6


gst_gl_sync_meta_wait ()

void
gst_gl_sync_meta_wait (GstGLSyncMeta *sync_meta,
                       GstGLContext *context);

Insert a wait into context 's command stream ensuring all previous OpenGL commands before sync_meta have completed.

Parameters

sync_meta

a GstGLSyncMeta

 

context

a GstGLContext

 

Since: 1.6


gst_gl_sync_meta_wait_cpu ()

void
gst_gl_sync_meta_wait_cpu (GstGLSyncMeta *sync_meta,
                           GstGLContext *context);

Perform a wait so that the sync point has passed from the CPU's perspective What that means, is that all GL operations changing CPU-visible data before the sync point are now visible.

Parameters

sync_meta

a GstGLSyncMeta

 

context

a GstGLContext

 

Since: 1.8

Types and Values

struct GstGLSyncMeta

struct GstGLSyncMeta {
  GstMeta parent;

  GstGLContext *context;

  gpointer      data;

  void (*set_sync) (GstGLSyncMeta * sync, GstGLContext * context);
  void (*set_sync_gl) (GstGLSyncMeta * sync, GstGLContext * context);
  void (*wait) (GstGLSyncMeta * sync, GstGLContext * context);
  void (*wait_gl) (GstGLSyncMeta * sync, GstGLContext * context);
  void (*wait_cpu) (GstGLSyncMeta * sync, GstGLContext * context);
  void (*wait_cpu_gl) (GstGLSyncMeta * sync, GstGLContext * context);
  void (*copy) (GstGLSyncMeta * src, GstBuffer * sbuffer, GstGLSyncMeta * dest, GstBuffer * dbuffer);
  void (*free) (GstGLSyncMeta * sync, GstGLContext * context);
  void (*free_gl) (GstGLSyncMeta * sync, GstGLContext * context);
};

Members

GstMeta parent;

the parent GstMeta

 

GstGLContext *context;

the GstGLContext used to allocate the meta

 

gpointer data;

a custom data pointer for the implementation

 

set_sync ()

set a sync point in the OpenGL command stream

 

set_sync_gl ()

the same as set_sync but called from context 's thread

 

wait ()

execute a wait on the previously set sync point into the OpenGL command stream

 

wait_gl ()

the same as wait but called from context 's thread

 

wait_cpu ()

wait for the previously set sync point to pass from the CPU

 

wait_cpu_gl ()

the same as wait_cpu but called from context 's thread

 

copy ()

copy data into a new GstGLSyncMeta

 

free ()

free data

 

free_gl ()

free data in context 's thread

 

GST_BUFFER_POOL_OPTION_GL_SYNC_META

#define GST_BUFFER_POOL_OPTION_GL_SYNC_META "GstBufferPoolOptionGLSyncMeta"

An option that can be activated on bufferpools to request OpenGL synchronization metadata on buffers from the pool.

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