# ESfilter Functions to report on and control Elementary Stream filters. There are separate API functions to operate on the different types of filter, but they all work in the same way. In the descriptions below the `XXX` in the function name can be replaced with `video`, `audio`, `teletext`, `subtit` (subtitle), `ca` or `other` as required. ### esfilter/XXX/class Lists the descriptions, options and defaults for configuring the chosen type of filter, ie Configuration -> Stream -> Stream Filters -> {chosen type} -> Add. ### esfilter/XXX/grid Returns the parameters of the defined filters of the chosen type. The usual selection options are available, see [Grid Parameters](/documentation/development/json-api/api-description/common-parameters.md#grid-parameters) ### esfilter/XXX/create Creates a new filter of the chosen type. ADMIN privilege is required. * `conf` A JSON object describing the filter. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.tvheadend.org/documentation/development/json-api/api-description/esfilter.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.