Retrieve the number of values currently stored in the allocator params array of the query's structure.
If no memory allocator is specified, the downstream element can handle the default memory allocator. The first memory allocator in the query should be generic and allow mapping to system memory, all following allocators should be ordered by preference with the preferred one first.
| this |
a GST_QUERY_ALLOCATION type query Query |
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the allocator array size as a Signal. |