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diff --git a/DOCS/man/libmpv.rst b/DOCS/man/libmpv.rst new file mode 100644 index 0000000..e00f8b9 --- /dev/null +++ b/DOCS/man/libmpv.rst @@ -0,0 +1,79 @@ +EMBEDDING INTO OTHER PROGRAMS (LIBMPV) +====================================== + +mpv can be embedded into other programs as video/audio playback backend. The +recommended way to do so is using libmpv. See ``libmpv/client.h`` in the mpv +source code repository. This provides a C API. Bindings for other languages +might be available (see wiki). + +Since libmpv merely allows access to underlying mechanisms that can control +mpv, further documentation is spread over a few places: + +- https://github.com/mpv-player/mpv/blob/master/libmpv/client.h +- https://mpv.io/manual/master/#options +- https://mpv.io/manual/master/#list-of-input-commands +- https://mpv.io/manual/master/#properties +- https://github.com/mpv-player/mpv-examples/tree/master/libmpv + +C PLUGINS +========= + +You can write C plugins for mpv. These use the libmpv API, although they do not +use the libmpv library itself. + +They are enabled by default if compiler supports linking with the ``-rdynamic`` +flag on Linux/BSD platforms. On Windows the are always enabled. + +C plugins location +------------------ + +C plugins are put into the mpv scripts directory in its config directory +(see the `FILES`_ section for details). They must have a ``.so`` or ``.dll`` +file extension. They can also be explicitly loaded with the ``--script`` option. + +API +--- + +A C plugin must export the following function:: + + int mpv_open_cplugin(mpv_handle *handle) + +The plugin function will be called on loading time. This function does not +return as long as your plugin is loaded (it runs in its own thread). The +``handle`` will be deallocated as soon as the plugin function returns. + +The return value is interpreted as error status. A value of ``0`` is +interpreted as success, while ``-1`` signals an error. In the latter case, +the player prints an uninformative error message that loading failed. + +Return values other than ``0`` and ``-1`` are reserved, and trigger undefined +behavior. + +Within the plugin function, you can call libmpv API functions. The ``handle`` +is created by ``mpv_create_client()`` (or actually an internal equivalent), +and belongs to you. You can call ``mpv_wait_event()`` to wait for things +happening, and so on. + +Note that the player might block until your plugin calls ``mpv_wait_event()`` +for the first time. This gives you a chance to install initial hooks etc. +before playback begins. + +The details are quite similar to Lua scripts. + +Linkage to libmpv +----------------- + +The current implementation requires that your plugins are **not** linked against +libmpv. What your plugins use are not symbols from a libmpv binary, but +symbols from the mpv host binary. + +On Windows to make symbols from the host binary available, you have to define +MPV_CPLUGIN_DYNAMIC_SYM when compiling cplugin. This will load symbols +dynamically, before calling ``mpv_open_cplugin()``. + +Examples +-------- + +See: + +- https://github.com/mpv-player/mpv-examples/tree/master/cplugins |