mirror of
https://github.com/mpv-player/mpv
synced 2024-12-22 06:42:03 +00:00
6f20d6b74e
Commit e2e450f9 started making use of luaL_register(), but OF COURSE
this function disappeared in Lua 5.2, and was replaced with a 5.2-only
alternative, slightly different mechanism.
So just NIH our own function. This is actually slightly more correct,
since it forces the user to call "require" to actually make the module
visible for builtin C-only modules other than "mp". Fix autoload.lua
accordingly.
634 lines
25 KiB
ReStructuredText
634 lines
25 KiB
ReStructuredText
LUA SCRIPTING
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=============
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mpv can load Lua scripts. Scripts in ``~/.mpv/lua/`` will be loaded on program
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start, or if passed to ``--lua``. mpv provides the builtin module ``mp``, which
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provides functions to send commands to the mpv core and to retrieve information
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about playback state, user settings, file information, and so on.
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These scripts can be used to control mpv in a similar way to slave mode.
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Technically, the Lua code uses the client API internally.
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Example
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-------
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A script which leaves fullscreen mode when the player is paused:
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::
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function on_pause()
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mp.set_property("fullscreen", "no")
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end
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mp.register_event("pause", on_pause)
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This script provides a pretty weird feature, but Lua scripting was made to
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allow users implement features which are not going to be added to the mpv core.
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Mode of operation
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-----------------
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Your script will be loaded by the player at program start from ``~/.mpv/lua/``,
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or ``--lua``, or in some cases, internally (like ``--osc``). Each script runs
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in its own thread. Your script is first run "as is", and once that is done,
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the event loop is entered. This event loop will dispatch events received by mpv
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and call your own event handlers which you have registered with
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``mp.register_event``, or timers added with ``mp.add_timeout`` or similar.
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When the player quits, all scripts will be asked to terminate. This happens via
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a ``shutdown`` event, which by default will make the event loop return. If your
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script got into an endless loop, mpv will probably behave fine during playback
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(unless the player is suspended, see ``mp.suspend``), but it won't terminate
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when quitting, because it's waiting on your script.
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Internally, the C code will call the Lua function ``mp_event_loop`` after
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loading a Lua script. This function is normally defined by the default prelude
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loaded before your script (see ``player/lua/defaults.lua`` in the mpv sources).
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The event loop will wait for events and dispatch events registered with
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``mp.register_event``. It will also handle timers added with ``mp.add_timeout``
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and similar (by waiting with a timeout).
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mp functions
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------------
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The ``mp`` module is preloaded, although it can be loaded manually with
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``require 'mp'``. It provides the core client API.
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``mp.command(string)``
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Run the given command. This is similar to the commands used in input.conf.
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See `List of Input Commands`_.
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Returns ``true`` on success, or ``nil, error`` on error.
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``mp.commandv(arg1, arg2, ...)``
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Similar to ``mp.command``, but pass each command argument as separate
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parameter. This has the advantage that you don't have to care about
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quoting and escaping in some cases.
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Example:
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::
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mp.command("loadfile " .. filename .. " append")
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mp.commandv("loadfile", filename, "append")
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These two commands are equivalent, except that the first version breaks
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if the filename contains spaces or certain special characters.
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``mp.get_property(name [,def])``
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Return the value of the given property as string. These are the same
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properties as used in input.conf. See `Properties`_ for a list of
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properties. The returned string is formatted similar to ``${=name}``
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(see `Property Expansion`_).
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Returns the string on success, or ``def, error`` on error. ``def`` is the
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second parameter provided to the function, and is nil if it's missing.
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``mp.get_property_osd(name [,def])``
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Similar to ``mp.get_property``, but return the property value formatted for
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OSD. This is the same string as printed with ``${name}`` when used in
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input.conf.
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Returns the string on success, or ``def, error`` on error. ``def`` is the
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second parameter provided to the function, and is an empty string if it's
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missing. Unlike ``get_property()``, assigning the return value to a variable
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will always result in a string.
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``mp.get_property_bool(name [,def])``
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Similar to ``mp.get_property``, but return the property value as boolean.
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Returns a boolean on success, or ``def, error`` on error.
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``mp.get_property_number(name [,def])``
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Similar to ``mp.get_property``, but return the property value as number.
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Note that while Lua does not distinguish between integers and floats,
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mpv internals do. This function simply request a double float from mpv,
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and mpv will usually convert integer property values to float.
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Returns a number on success, or ``def, error`` on error.
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``mp.get_property_native(name [,def])``
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Similar to ``mp.get_property``, but return the property value using the best
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Lua type for the property. Most time, this will return a string, boolean,
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or number. Some properties (for example ``chapter-list``) are returned as
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tables.
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Returns a value on success, or ``def, error`` on error. Note that ``nil``
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might be a possible, valid value too in some corner cases.
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``mp.set_property(name, value)``
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Set the given property to the given string value. See ``mp.get_property``
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and `Properties`_ for more information about properties.
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Returns true on success, or ``nil, error`` on error.
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``mp.set_property_bool(name, value)``
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Similar to ``mp.set_property``, but set the given property to the given
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boolean value.
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``mp.set_property_number(name, value)``
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Similar to ``mp.set_property``, but set the given property to the given
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numeric value.
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Note that while Lua does not distinguish between integers and floats,
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mpv internals do. This function will test whether the number can be
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represented as integer, and if so, it will pass an integer value to mpv,
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otherwise a double float.
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``mp.set_property_native(name, value)``
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Similar to ``mp.set_property``, but set the given property using its native
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type.
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Since there are several data types which can not represented natively in
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Lua, this might not always work as expected. For example, while the Lua
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wrapper can do some guesswork to decide whether a Lua table is an array
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or a map, this would fail with empty tables. Also, there are not many
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properties for which it makes sense to use this, instead of
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``set_property``, ``set_property_bool``, ``set_property_number``.
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For these reasons, this function should probably be avoided for now, except
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for properties that use tables natively.
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``mp.get_time()``
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Return the current mpv internal time in seconds as a number. This is
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basically the system time, with an arbitrary offset.
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``mp.add_key_binding(key, name|fn [,fn])``
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Register callback to be run on a key binding. The binding will be mapped to
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the given ``key``, which is a string describing the physical key. This uses
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the same key names as in input.conf, and also allows combinations
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(e.g. ``ctrl+a``).
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After calling this function, key presses will cause the function ``fn`` to
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be called (unless the user overmapped the key with another binding).
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The ``name`` argument should be a short symbolic string. It allows the user
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to remap the key binding via input.conf using the ``script_message``
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command, and the name of the key binding (see below for
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an example). The name should be unique across other bindings in the same
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script - if not, the previous binding with the same name will be
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overwritten. You can omit the name, in which case a random name is generated
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internally.
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Internally, key bindings are dispatched via the ``script_message_to`` input
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command and ``mp.register_script_message``.
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Trying to map multiple commands to a key will essentially prefer a random
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binding, while the other bindings are not called. It is guaranteed that
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user defined bindings in the central input.conf are preferred over bindings
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added with this function (but see ``mp.add_forced_key_binding``).
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Example:
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::
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function something_handler()
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print("the key was pressed")
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end
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mp.add_key_binding("x", "something", something_handler)
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This will print the message ``the key was pressed`` when ``x`` was pressed.
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The user can remap these key bindings. Then the user has to put the
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following into his input.conf to remap the command to the ``y`` key:
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::
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y script_message something
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This will print the message when the key ``y`` is pressed. (``x`` will
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still work, unless the user overmaps it.)
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You can also explicitly send a message to a named script only. Assume the
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above script was using the filename ``fooscript.lua``:
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::
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y script_message_to fooscript something
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``mp.add_forced_key_binding(...)``
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This works almost the same as ``mp.add_key_binding``, but registers the
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key binding in a way that will overwrite the user's custom bindings in his
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input.conf. (``mp.add_key_binding`` overwrites default key bindings only,
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but not those by the user's input.conf.)
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``mp.remove_key_binding(name)``
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Remove a key binding added with ``mp.add_key_binding`` or
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``mp.add_forced_key_binding``. Use the same name as you used when adding
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the bindings. It's not possible to remove bindings for which you omitted
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the name.
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``mp.register_event(name, fn)``
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Call a specific function when an event happens. The event name is a string,
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and the function fn is a Lua function value.
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Some events have associated data. This is put into a Lua table and passed
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as argument to fn. The Lua table by default contains a ``name`` field,
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which is a string containing the event name. If the event has an error
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associated, the ``error`` field is set to a string describing the error,
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on success it's not set.
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If multiple functions are registered for the same event, they are run in
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registration order, which the first registered function running before all
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the other ones.
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Returns true if such an event exists, false otherwise.
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See `Events`_ and `List of events`_ for details.
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``mp.unregister_event(fn)``
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Undo ``mp.register_event(..., fn)``. This removes all event handlers that
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are equal to the ``fn`` parameter. This uses normal Lua ``==`` comparison,
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so be careful when dealing with closures.
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``mp.observe_property(name, type, fn)``
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Watch a property for changes. If the property ``name`` is changed, then
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the function ``fn(name)`` will be called. ``type`` can be ``nil``, or be
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set to one of ``none``, ``native``, ``bool``, ``string``, or ``number``.
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``none`` is the same as ``nil``. For all other values, the new value of
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the property will be passed as second argument to ``fn``, using
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``mp.get_property_<type>`` to retrieve it. This means if ``type`` is for
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example ``string``, ``fn`` is roughly called as in
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``fn(name, mp.get_property_string(name))``.
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If possible, change events are coalesced. If a property is changed a bunch
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of times in a row, only the last change triggers the change function. (The
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exact behavior depends on timing and other things.)
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In some cases the function is not called even if the property changes.
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Whether this can happen depends on the property.
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If the ``type`` is ``none`` or ``nil``, sporadic property change events are
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possible. This means the change function ``fn`` can be called even if the
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property doesn't actually change.
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``mp.unobserve_property(fn)``
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Undo ``mp.observe_property(..., fn)``. This removes all property handlers
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that are equal to the ``fn`` parameter. This uses normal Lua ``==``
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comparison, so be careful when dealing with closures.
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``mp.add_timeout(seconds, fn)``
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Call the given function fn when the given number of seconds has elapsed.
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Note that the number of seconds can be fractional. For now, the timer's
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resolution may be as low as 50 ms, although this will be improved in the
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future.
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This is a one-shot timer: it will be removed when it's fired.
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Returns a timer object. See ``mp.add_periodic_timer`` for details.
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``mp.add_periodic_timer(seconds, fn)``
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Call the given function periodically. This is like ``mp.add_timeout``, but
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the timer is re-added after the function fn is run.
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Returns a timer object. The timer object provides the following methods:
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``stop()``
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Disable the timer. Does nothing if the timer is already disabled.
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This will remember the current elapsed time when stopping, so that
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``resume()`` essentially unpauses the timer.
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``kill()``
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Disable the timer. Resets the elapsed time. ``resume()`` will
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restart the timer.
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``resume()``
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Restart the timer. If the timer was disabled with ``stop()``, this
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will resume at the time it was stopped. If the timer was disabled
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with ``kill()``, or if it's a previously fired one-shot timer (added
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with ``add_timeout()``), this starts the timer from the beginning,
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using the initially configured timeout.
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``mp.get_opt(key)``
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Return a setting from the ``--lua-opts`` option. It's up to the user and
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the script how this mechanism is used. Currently, all scripts can access
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this equally, so you should be careful about collisions.
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``mp.get_script_name()``
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Return the name of the current script. The name is usually made of the
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filename of the script, with directory and file extension removed. If
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there are several script which would have the same name, it's made unique
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by appending a number.
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.. admonition:: Example
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The script ``/path/to/fooscript.lua`` becomes ``fooscript``.
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``mp.osd_message(text [,duration])``
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Show an OSD message on the screen. ``duration`` is in seconds, and is
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optional (uses ``--osd-duration`` by default).
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Advanced mp functions
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---------------------
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These also live in the ``mp`` module, but are documented separately as they
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are useful only in special situations.
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``mp.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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This is automatically called by the event handler.
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``mp.resume()``
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Undo one ``mp.suspend()`` call. ``mp.suspend()`` increments an internal
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counter, and ``mp.resume()`` decrements it. When 0 is reached, the player
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is actually resumed.
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``mp.resume_all()``
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This resets the internal suspend counter and resumes the player. (It's
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like calling ``mp.resume()`` until the player is actually resumed.)
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You might want to call this if you're about to do something that takes a
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long time, but doesn't really need access to the player (like a network
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operation). Note that you still can access the player at any time.
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``mp.get_wakeup_pipe()``
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Calls ``mpv_get_wakeup_pipe()`` and returns the read end of the wakeup
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pipe. (See ``client.h`` for details.)
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``mp.get_next_timeout()``
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Return the relative time in seconds when the next timer (``mp.add_timeout``
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and similar) expires. If there is no timer, return ``nil``.
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``mp.dispatch_events([allow_wait])``
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This can be used to run custom event loops. If you want to have direct
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control what the Lua script does (instead of being called by the default
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event loop), you can set the global variable ``mp_event_loop`` to your
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own function running the event loop. From your event loop, you should call
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``mp.dispatch_events()`` to unqueue and dispatch mpv events.
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If the ``allow_wait`` parameter is set to ``true``, the function will block
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until the next event is received or the next timer expires. Otherwise (and
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this is the default behavior), it returns as soon as the event loop is
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emptied. It's strongly recommended to use ``mp.get_next_timeout()`` and
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``mp.get_wakeup_pipe()`` if you're interested in properly working
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notification of new events and working timers.
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This function calls ``mp.suspend()`` and ``mp.resume_all()`` on its own.
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``mp.enable_messages(level)``
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Set the minimum log level of which mpv message output to receive. These
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messages are normally printed to the terminal. By calling this function,
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you can set the minimum log level of messages which should be received with
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the ``log-message`` event. See the description of this event for details.
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The level is a string, see ``msg.log`` for allowed log levels.
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``mp.register_script_message(name, fn)``
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This is a helper to dispatch ``script_message`` or ``script_message_to``
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invocations to Lua functions. ``fn`` is called if ``script_message`` or
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``script_message_to`` (with this script as destination) is run
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with ``name`` as first parameter. The other parameters are passed to ``fn``.
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If a message with the given name is already registered, it's overwritten.
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Used by ``mp.add_key_binding``, so be careful about name collisions.
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``mp.unregister_script_message(name)``
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Undo a previous registration with ``mp.register_script_message``. Does
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nothing if the ``name`` wasn't registered.
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mp.msg functions
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----------------
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This module allows outputting messages to the terminal, and can be loaded
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with ``require 'mp.msg'``.
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``msg.log(level, ...)``
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The level parameter is the message priority. It's a string and one of
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``fatal``, ``error``, ``warn``, ``info``, ``v``, ``debug``. The user's
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settings will determine which of these messages will be visible. Normally,
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all messages are visible, except ``v`` and ``debug``.
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The parameters after that are all converted to strings. Spaces are inserted
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to separate multiple parameters.
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You don't need to add newlines.
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``msg.fatal(...)``, ``msg.error(...)``, ``msg.warn(...)``, ``msg.info(...)``, ``msg.verbose(...)``, ``msg.debug(...)``
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All of these are shortcuts and equivalent to the corresponding
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``msg.log(level, ...)`` call.
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mp.options functions
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--------------------
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mpv comes with a built-in module to manage options from config-files and the
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command-line. All you have to do is to supply a table with default options to
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the read_options function. The function will overwrite the default values
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with values found in the config-file and the command-line (in that order).
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``options.read_options(table [, identifier])``
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A ``table`` with key-value pairs. The type of the default values is
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important for converting the values read from the config file or
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command-line back. Do not use ``nil`` as a default value!
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The ``identifier`` is used to identify the config-file and the command-line
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options. These needs to unique to avoid collisions with other scripts.
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Defaults to ``mp.get_script_name()``.
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Example implementation::
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require 'mp.options'
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local options = {
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optionA = "defaultvalueA",
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optionB = -0.5,
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optionC = true,
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}
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options.read_options(options, "myscript")
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print(option.optionA)
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The config file will be stored in ``lua-settings/identifier.conf`` in mpv's user
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folder. Comment lines can be started with # and stray spaces are not removed.
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Boolean values will be represented with yes/no.
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Example config::
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# comment
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optionA=Hello World
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optionB=9999
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optionC=no
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Command-line options are read from the ``--lua-opts`` parameter. To avoid
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collisions, all keys have to be prefixed with ``identifier-``.
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Example command-line::
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--lua-opts=myscript-optionA=TEST:myscript-optionB=0:myscript-optionC=yes
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mp.utils options
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----------------
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This built-in module provides generic helper functions for Lua, and have
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strictly speaking nothing to do with mpv or video/audio playback. They are
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provided for convenience. Most compensate for Lua's scarce standard library.
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``utils.readdir(path [, filter])``
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Enumerate all entries at the given path on the filesystem, and return them
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as array. Each entry is a directory entry (without the path).
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The list is unsorted (in whatever order the operating system returns it).
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If the ``filter`` argument is given, it must be one of the following
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strings:
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``files``
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List regular files only. This excludes directories, special files
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(like UNIX device files or FIFOs), and dead symlinks. It includes
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UNIX symlinks to regular files.
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``dirs``
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List directories only, or symlinks to directories. ``.`` and ``..``
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are not included.
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``normal``
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Include the results of both ``files`` and ``dirs``. (This is the
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default.)
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``all``
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List all entries, even device files, dead symlinks, FIFOs, and the
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``.`` and ``..`` entries.
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On error, ``nil, error`` is returned.
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``utils.split_path(path)``
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Split a path into directory component and filename component, and return
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them. The first return value is always the directory. The second return
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value is the trailing part of the path, the directory entry.
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``utils.join_path(p1, p2)``
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Return the concatenation of the 2 paths. Tries to be clever. For example,
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if ```p2`` is an absolute path, p2 is returned without change.
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Events
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------
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Events are notifications from player core to scripts. You can register an
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event handler with ``mp.register_event``.
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Note that all scripts (and other parts of the player) receive events equally,
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and there's no such thing as blocking other scripts from receiving events.
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Example:
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::
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function my_fn(event)
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print("start of playback!")
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end
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mp.register_event("playback-start", my_fn)
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List of events
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--------------
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``start-file``
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Happens right before a new file is loaded. When you receive this, the
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player is loading the file (or possibly already done with it).
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``end-file``
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Happens after a file was unloaded. Typically, the player will load the
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next file right away, or quit if this was the last file.
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``file-loaded``
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Happens after a file was loaded and begins playback.
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``seek``
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Happens on seeking (including ordered chapter segment changes).
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``playback-restart``
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Start of playback after seek or after file was loaded.
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``tracks-changed``
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The list of video/audio/sub tracks was updated. (This happens on playback
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start, and very rarely during playback.)
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``track-switched``
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A video/audio/subtitle track was switched on or off. This usually happens
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when the user (or a script) changes the subtitle track and so on.
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``idle``
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Idle mode is entered. This happens when playback ended, and the player was
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started with ``--idle`` or ``--force-window``. This mode is implicitly ended
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when the ``start-file`` or ``shutdown`` events happen.
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``pause``
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Playback was paused. This also happens when for example the player is
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paused on low network cache. Then the event type indicates the pause state
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(like the property "pause" as opposed to the "core-idle" property), and you
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might receive multiple ``pause`` events in a row.
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``unpause``
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Playback was unpaused. See above for details.
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``tick``
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Called after a video frame was displayed. This is a hack, and you should
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avoid using it. Use timers instead and maybe watch pausing/unpausing events
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to avoid wasting CPU when the player is paused.
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``shutdown``
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Sent when the player quits, and the script should terminate. Normally
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handled automatically. See `Mode of operation`_.
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``log-message``
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Receives messages enabled with ``mp.enable_messages``. The message data
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is contained in the table passed as first parameter to the event handler.
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The table contains, in addition to the default event fields, the following
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fields:
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``prefix``
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The module prefix, identifies the sender of the message. This is what
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the terminal player puts in front of the message text when using the
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``--v`` option, and is also what is used for ``--msg-level``.
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``level``
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The log level as string. See ``msg.log`` for possible log level names.
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Note that later versions of mpv might add new levels or remove
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(undocumented) existing ones.
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``text``
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The log message. Note that this is the direct output of a printf()
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style output API. The text will contain embedded newlines, and it's
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possible that a single message contains multiple lines, or that a
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message contains a partial line.
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It's safe to display messages only if they end with a newline character,
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and to buffer them otherwise.
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Keep in mind that these messages are meant to be hints for humans. You
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should not parse them, and prefix/level/text of messages might change
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any time.
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``get-property-reply``
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Undocumented (not useful for Lua scripts).
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``set-property-reply``
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Undocumented (not useful for Lua scripts).
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``command-reply``
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Undocumented (not useful for Lua scripts).
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``script-input-dispatch``
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Undocumented (used internally).
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``client-message``
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Undocumented (used internally).
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``video-reconfig``
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Happens on video output or filter reconfig.
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``audio-reconfig``
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Happens on audio output or filter reconfig.
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``metadata-update``
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Metadata (like file tags) was updated.
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``chapter-change``
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The current chapter possibly changed.
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