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https://github.com/mpv-player/mpv
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141 lines
4.0 KiB
ReStructuredText
141 lines
4.0 KiB
ReStructuredText
JSON IPC
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========
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mpv can be controlled by external programs using the JSON-based IPC protocol. It
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can be enabled by specifying the path to a unix socket using the option
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``--input-unix-socket``. Clients can connect to this socket and send commands to
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the player or receive events from it.
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Protocol
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--------
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Clients can execute commands on the player by sending JSON messages of the
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following form:
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::
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{ "command": ["command_name", "param1", "param2", ...] }
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where ``command_name`` is the name of the command to be executed, followed by a
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list of parameters. Parameters must be formatted as native JSON values
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(integers, strings, booleans, ...). Every message **must** be terminated with
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``\n``. Additionally, ``\n`` must not appear anywhere inside the message. In
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practice this means that messages should be minified before being sent to mpv.
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mpv will then send back a reply indicating whether the command was run
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correctly, and an additional field holding the command-specific return data (it
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can also be null).
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::
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{ "error": "success", "data": null }
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mpv will also send events to clients with JSON messages of the following form:
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::
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{ "event": "event_name" }
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where ``event_name`` is the name of the event. Additional event-specific fields
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can also be present. See `List of events`_ for a list of all supported events.
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Commands
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--------
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Additionally to the commands described in `List of Input Commands`_, a few
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extra commands can also be used as part of the protocol:
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``client_name``
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Return the name of the client as string. This is the string ``ipc-N`` with
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N being an integer number.
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``get_time_us``
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Return the current mpv internal time in microseconds as a number. This is
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basically the system time, with an arbitrary offset.
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``get_property``
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Return the value of the given property. The value will be sent in the data
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field of the replay message.
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Example:
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::
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{ "command": ["get_property", "volume"] }
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{ "data": 50.0, "error": "success" }
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``get_property_string``
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Like ``get_property``, but the resulting data will always be a string.
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Example:
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::
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{ "command": ["get_property_string", "volume"] }
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{ "data": "50.000000", "error": "success" }
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``set_property``
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Set the given property to the given value. See `Properties`_ for more
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information about properties.
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Example:
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::
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{ "command": ["set_property", "pause", true] }
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{ "error": "success" }
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``set_property_string``
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Like ``set_property``, but the argument value must be passed as string.
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Example:
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::
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{ "command": ["set_property_string", "pause", "yes"] }
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{ "error": "success" }
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``observe_property``
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Watch a property for changes. If the given property is changed, then an
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event of type ``property-change`` will be generated
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Example:
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::
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{ "command": ["observe_property", 1, "volume"] }
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{ "error": "success" }
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{ "event": "property-change", "id": 1, "data": 52.0, "name": "volume" }
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``observe_property_string``
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Like ``observe_property``, but the resulting data will always be a string.
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Example:
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::
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{ "command": ["observe_property", 1, "volume"] }
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{ "error": "success" }
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{ "event": "property-change", "id": 1, "data": "52.000000", "name": "volume" }
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``unobserve_property``
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Undo ``observe_property`` or ``observe_property_string``. This requires the
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numeric id passed to the observe command as argument.
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Example:
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::
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{ "command": ["unobserve_property", 1] }
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{ "error": "success" }
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``suspend``
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Suspend the mpv main loop. There is a long-winded explanation of this in
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the C API function ``mpv_suspend()``. In short, this prevents the player
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from displaying the next video frame, so that you don't get blocked when
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trying to access the player.
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``resume``
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Undo one ``suspend`` call. ``suspend`` increments an internal counter, and
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``resume`` decrements it. When 0 is reached, the player is actually resumed.
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