audioaggregator: Consider converting for equal audio formats
The converter might have a non-passthrough mix-matrix
. The converter
can determine whether it should pass through, so let it, then remove it
if it's indeed a passthrough.
FIXME: Not converting when we need to but the config is invalid (e.g.
because the mix-matrix
is not the right size) produces garbage. An
invalid config should cause a GST_FLOW_NOT_NEGOTIATED
. (This issue is already existent and not a regression from this MR.)