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* this if they support seeking in formats other than the configured native
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* format. By default, it tries to convert the seek arguments to the
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* configured native format and prepare a segment in that format.
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* @do_seek: Perform seeking on the resource to the indicated segment.
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* @unlock: Unlock any pending access to the resource. Subclasses should
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* unblock any blocked function ASAP. In particular, any create() function in