gstreamer

appsink: Use a class handler callback instead of vfunc for `propose-allocation`

docs: Add missing dot in handy elements (tutorial 14)

docs: Update tutorial 14 to 1.0 (audio/x-raw)

allocators: drm-dumb: Annotate allocator instance parameters with the correct type

allocators: drm-dumb: Annotate device-path as a filename