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opengl - How do I get a GstGLContext out of an element like a gltestsrc?

I have a gstreamer app that also uses OpenGL. In order to run GL code I must run it on the GL thread. In order to run code on the GL thread I have to call gst_gl_context_thread_add(ctx,func,data). The first argument to that function is a GstGLContext*.

I am currently guessing that I can get a reference to gstreamer's current GL context by calling gst_element_get_context(elt, context_type), with an element like a gltestsrc but the documentation for the function gives absolutely no hints about what string to pass in for the context_type.

How can I get a reference to gstreamer's GstGLContext?

question from:https://stackoverflow.com/questions/65889865/how-do-i-get-a-gstglcontext-out-of-an-element-like-a-gltestsrc

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