EGL_NV_stream_metadata
https://www.khronos.org/registry/egl/specs/eglspec.1.5.pdf
EGL_NV_stream_metadata

	EGL_MAX_STREAM_METADATA_BLOCKS_NV 0x3250
	EGL_MAX_STREAM_METADATA_BLOCK_SIZE_NV 0x3251
	EGL_MAX_STREAM_METADATA_TOTAL_SIZE_NV 0x3252
	EGL_PRODUCER_METADATA_NV 0x3253
	EGL_CONSUMER_METADATA_NV 0x3254
	EGL_METADATA0_SIZE_NV 0x3255
	EGL_METADATA1_SIZE_NV 0x3256
	EGL_METADATA2_SIZE_NV 0x3257
	EGL_METADATA3_SIZE_NV 0x3258
	EGL_METADATA0_TYPE_NV 0x3259
	EGL_METADATA1_TYPE_NV 0x325A
	EGL_METADATA2_TYPE_NV 0x325B
	EGL_METADATA3_TYPE_NV 0x325C
	EGL_PENDING_METADATA_NV 0x3328
	EGLBoolean eglQueryDisplayAttribNV (EGLDisplay dpy, EGLint attribute, EGLAttrib* value)
	EGLBoolean eglQueryStreamMetadataNV (EGLDisplay dpy, EGLStreamKHR stream, EGLenum name, EGLint n, EGLint offset, EGLint size, void* data)
	EGLBoolean eglSetStreamMetadataNV (EGLDisplay dpy, EGLStreamKHR stream, EGLint n, EGLint offset, EGLint size, const void* data)