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Overview of PipeWire

SPA Plugin Creation (pipewire/spa/plugins )

1. Implemented each SPA plugins with a group of factories.
2. Each factory should have the below details
       * Version ( SPA_VERSION_HANDLE_FACTORY )
       * Factory Name ( SPA_NAME_API_* - eg.SPA_NAME_API_LIBCAMERA_ENUM_UDEV)
       * SPA dictionary information ( struct spa_dict )
       * Get size callback  - impl_get_size()
           - Each factory has its own impl structure for to maintain some specific details.
           - With this callback, we can get the size of this factory impl structure
       * Initialization callback – impl_init()
           - This will initialize this factory-specific activity
       * Enum interface info callback - impl_enum_interface_info()
3. Each SPA plugin's factories are associated with the spa_handle_factory_enum() function.
4. libcamera SPA plugin’s factories(libcamera.c)