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ba3e564e34
The filter graph has, after parsing, a default number of input and output ports. This is based on the description or the first/last element input and output ports. Pass this information in the properties when we emit the info. Don't use the number of configured input/output ports as the default number of channels in filter-chain because this is only determined after activating the graph. Instead, use the default input/output channels. The result is that when you load filter-chain without any channel layout, it will default to the number of input/outputs of the graph instead of 0. This allows for the node to be visible in the pulseaudio API. Fixes #5084