trySubmit

Hands a decoded frame over without suspending.

For a caller that must stay able to answer something else while the queue is full, which is what the engine's decoder worker is: it has to be able to park for a seek, and it cannot do that from inside a wait. Retrying this is safe in a way that wrapping submit in a timeout is not, because a handover that has already happened cannot be reported as not having happened. A timeout around submit can discard the result of a completed handover, and the caller then offers the queue a frame it already holds, which is closed twice.