%NULL-terminated array of environment variables affecting the feature set of the plugin (e.g. an environment variable containing paths where to look for additional modules/plugins of a library), or %NULL. Environment variable names may be followed by a path component which will be added to the content of the environment variable, e.g. "HOME/.mystuff/plugins".
%NULL-terminated array of directories/paths where dependent files may be, or %NULL.
%NULL-terminated array of file names (or file name suffixes, depending on @flags) to be used in combination with the paths from @paths and/or the paths extracted from the environment variables in @env_vars, or %NULL.
optional flags, or #GST_PLUGIN_DEPENDENCY_FLAG_NONE
Make GStreamer aware of external dependencies which affect the feature set of this plugin (ie. the elements or typefinders associated with it).
GStreamer will re-inspect plugins with external dependencies whenever any of the external dependencies change. This is useful for plugins which wrap other plugin systems, e.g. a plugin which wraps a plugin-based visualisation library and makes visualisations available as GStreamer elements, or a codec loader which exposes elements and/or caps dependent on what external codec libraries are currently installed.