allocators: support mmap offset in fd_allocator to fix issues with pipewiresrc
Make a new gst_fd_allocator_alloc_full() that allows an offset argument that is then used as the offset for mmap().
Edited by Tim-Philipp Müller
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Make a new gst_fd_allocator_alloc_full() that allows an offset argument that is then used as the offset for mmap().