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