[gmpi] Topic 7.3: Unconnected inputs/outputs

Topic 7.3:  Unconnected inputs/outputs
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Q: How do we handle disconnected inputs/outputs?

a) They are given a NULL buffer and must detect it.

b) They are given a zero-filled (or SILENT) buffer.

c) If a plugin supports disconnected inputs/outputs, they are flagged
or negotiated at connection-time.  If an in/out is agreed to be
disconnected, no buffer is needed.  Otherwise, the host must provide a
zero-filled (or SILENT) buffer for logically disconnect in/outs.


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