[Bug]: AMF FRC doesn't recover after Drain, SubmitInput() returns AMF_EOF.

[kasper93]

To reproduce

1. Call AMFComponent::Drain()
2. Call AMFComponent::QueryOutput() until AMF_EOF is returned.
3. Call AMFComponent::SubmitInput()

At this point the AMFComponent::SubmitInput() will keep returning AMF_EOF. This can be recovered by AMFComponent::ReInit(), but this is not what documentation says.

In AMFComponent::QueryOutput() we can read:

When draining has been initiated (see AMFComponent::Drain for more detail) and the last output sample has been retrieved, QueryOutput returns AMF_EOF. This indicates the end of the drain operation, after which input samples can continue to be submitted.

In AMFComponent::SubmitInput() we can read:

AMF_INPUT_FULL when the output is not properly drained

and we see that AMF_EOF is not documented to be valid return value from submit.

My understanding is that after draining completes, there shouldn't be a need to call reinit, and SubmitInput() shouldn't return AMF_EOF, as it makes little sense.

Thanks,
Kacper