This is needed for example for Clang compiler which uses different
annotations than GCC. It will make WebRTC to happily use PipeWire
since the spa library is header-only and WebRTC defaults to use
Clang with -Wimplicit-fallthrough.
A sink and source can have an array of pa_format_info structures
that contain the possible formats of the device. Parse them from
the EnumFormat and return them when introspecting.
