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mpv/libmpv/client.h

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/* Copyright (C) 2017 the mpv developers
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Note: the client API is licensed under ISC (see above) to enable
* other wrappers outside of mpv. But keep in mind that the
* mpv core is by default still GPLv2+ - unless built with
* --enable-lgpl, which makes it LGPLv2+.
*/
#ifndef MPV_CLIENT_API_H_
#define MPV_CLIENT_API_H_
#include <stddef.h>
#include <stdint.h>
/* New symbols must still be added to libmpv/mpv.def. */
#ifdef _WIN32
#define MPV_EXPORT __declspec(dllexport)
#elif defined(__GNUC__) || defined(__clang__)
#define MPV_EXPORT __attribute__((visibility("default")))
#else
#define MPV_EXPORT
#endif
#ifdef __cplusplus
extern "C" {
#endif
/**
* Mechanisms provided by this API
* -------------------------------
*
* This API provides general control over mpv playback. It does not give you
* direct access to individual components of the player, only the whole thing.
* It's somewhat equivalent to MPlayer's slave mode. You can send commands,
* retrieve or set playback status or settings with properties, and receive
* events.
*
* The API can be used in two ways:
* 1) Internally in mpv, to provide additional features to the command line
* player. Lua scripting uses this. (Currently there is no plugin API to
* get a client API handle in external user code. It has to be a fixed
* part of the player at compilation time.)
* 2) Using mpv as a library with mpv_create(). This basically allows embedding
* mpv in other applications.
*
* Documentation
* -------------
*
* The libmpv C API is documented directly in this header. Note that most
* actual interaction with this player is done through
* options/commands/properties, which can be accessed through this API.
* Essentially everything is done with them, including loading a file,
* retrieving playback progress, and so on.
*
* These are documented elsewhere:
* * http://mpv.io/manual/master/#options
* * http://mpv.io/manual/master/#list-of-input-commands
* * http://mpv.io/manual/master/#properties
*
* You can also look at the examples here:
* * https://github.com/mpv-player/mpv-examples/tree/master/libmpv
*
* Event loop
* ----------
*
* In general, the API user should run an event loop in order to receive events.
* This event loop should call mpv_wait_event(), which will return once a new
* mpv client API is available. It is also possible to integrate client API
* usage in other event loops (e.g. GUI toolkits) with the
* mpv_set_wakeup_callback() function, and then polling for events by calling
* mpv_wait_event() with a 0 timeout.
*
* Note that the event loop is detached from the actual player. Not calling
* mpv_wait_event() will not stop playback. It will eventually congest the
* event queue of your API handle, though.
*
* Synchronous vs. asynchronous calls
* ----------------------------------
*
* The API allows both synchronous and asynchronous calls. Synchronous calls
* have to wait until the playback core is ready, which currently can take
* an unbounded time (e.g. if network is slow or unresponsive). Asynchronous
* calls just queue operations as requests, and return the result of the
* operation as events.
*
* Asynchronous calls
* ------------------
*
* The client API includes asynchronous functions. These allow you to send
* requests instantly, and get replies as events at a later point. The
* requests are made with functions carrying the _async suffix, and replies
* are returned by mpv_wait_event() (interleaved with the normal event stream).
*
* A 64 bit userdata value is used to allow the user to associate requests
* with replies. The value is passed as reply_userdata parameter to the request
* function. The reply to the request will have the reply
* mpv_event->reply_userdata field set to the same value as the
* reply_userdata parameter of the corresponding request.
*
* This userdata value is arbitrary and is never interpreted by the API. Note
* that the userdata value 0 is also allowed, but then the client must be
* careful not accidentally interpret the mpv_event->reply_userdata if an
* event is not a reply. (For non-replies, this field is set to 0.)
*
* Asynchronous calls may be reordered in arbitrarily with other synchronous
* and asynchronous calls. If you want a guaranteed order, you need to wait
* until asynchronous calls report completion before doing the next call.
*
* See also the section "Asynchronous command details" in the manpage.
*
* Multithreading
* --------------
*
* The client API is generally fully thread-safe, unless otherwise noted.
* Currently, there is no real advantage in using more than 1 thread to access
* the client API, since everything is serialized through a single lock in the
* playback core.
*
* Basic environment requirements
* ------------------------------
*
* This documents basic requirements on the C environment. This is especially
* important if mpv is used as library with mpv_create().
*
* - The LC_NUMERIC locale category must be set to "C". If your program calls
* setlocale(), be sure not to use LC_ALL, or if you do, reset LC_NUMERIC
* to its sane default: setlocale(LC_NUMERIC, "C").
* - If a X11 based VO is used, mpv will set the xlib error handler. This error
* handler is process-wide, and there's no proper way to share it with other
* xlib users within the same process. This might confuse GUI toolkits.
* - mpv uses some other libraries that are not library-safe, such as Fribidi
* (used through libass), ALSA, FFmpeg, and possibly more.
* - The FPU precision must be set at least to double precision.
* - On Windows, mpv will call timeBeginPeriod(1).
* - On memory exhaustion, mpv will kill the process.
* - In certain cases, mpv may start sub processes (such as with the ytdl
* wrapper script).
* - Using UNIX IPC (off by default) will override the SIGPIPE signal handler,
* and set it to SIG_IGN. Some invocations of the "subprocess" command will
* also do that.
* - mpv may start sub processes, so overriding SIGCHLD, or waiting on all PIDs
* (such as calling wait()) by the parent process or any other library within
* the process must be avoided. libmpv itself only waits for its own PIDs.
* - If anything in the process registers signal handlers, they must set the
* SA_RESTART flag. Otherwise you WILL get random failures on signals.
*
* Encoding of filenames
* ---------------------
*
* mpv uses UTF-8 everywhere.
*
* On some platforms (like Linux), filenames actually do not have to be UTF-8;
* for this reason libmpv supports non-UTF-8 strings. libmpv uses what the
* kernel uses and does not recode filenames. At least on Linux, passing a
* string to libmpv is like passing a string to the fopen() function.
*
* On Windows, filenames are always UTF-8, libmpv converts between UTF-8 and
* UTF-16 when using win32 API functions. libmpv never uses or accepts
* filenames in the local 8 bit encoding. It does not use fopen() either;
* it uses _wfopen().
*
* On OS X, filenames and other strings taken/returned by libmpv can have
* inconsistent unicode normalization. This can sometimes lead to problems.
* You have to hope for the best.
*
* Also see the remarks for MPV_FORMAT_STRING.
*
* Embedding the video window
* --------------------------
*
* Using the render API (in render.h) is recommended. This API requires
* you to create and maintain an OpenGL context, to which you can render
* video using a specific API call. This API does not include keyboard or mouse
* input directly.
*
* There is an older way to embed the native mpv window into your own. You have
* to get the raw window handle, and set it as "wid" option. This works on X11,
* win32, and OSX only. It's much easier to use than the render API, but
* also has various problems.
*
* Also see client API examples and the mpv manpage. There is an extensive
* discussion here:
* https://github.com/mpv-player/mpv-examples/tree/master/libmpv#methods-of-embedding-the-video-window
*
* Compatibility
* -------------
*
* mpv development doesn't stand still, and changes to mpv internals as well as
* to its interface can cause compatibility issues to client API users.
*
* The API is versioned (see MPV_CLIENT_API_VERSION), and changes to it are
* documented in DOCS/client-api-changes.rst. The C API itself will probably
* remain compatible for a long time, but the functionality exposed by it
* could change more rapidly. For example, it's possible that options are
* renamed, or change the set of allowed values.
*
* Defensive programming should be used to potentially deal with the fact that
* options, commands, and properties could disappear, change their value range,
* or change the underlying datatypes. It might be a good idea to prefer
* MPV_FORMAT_STRING over other types to decouple your code from potential
* mpv changes.
*
* Also see: DOCS/compatibility.rst
*
* Future changes
* --------------
*
* This are the planned changes that will most likely be done on the next major
* bump of the library:
*
* - remove all symbols that are marked as deprecated
* - reassign enum numerical values to remove gaps
* - disabling all events by default
*/
/**
* The version is incremented on each API change. The 16 lower bits form the
* minor version number, and the 16 higher bits the major version number. If
* the API becomes incompatible to previous versions, the major version
* number is incremented. This affects only C part, and not properties and
* options.
*
* Every API bump is described in DOCS/client-api-changes.rst
*
* You can use MPV_MAKE_VERSION() and compare the result with integer
* relational operators (<, >, <=, >=).
*/
#define MPV_MAKE_VERSION(major, minor) (((major) << 16) | (minor) | 0UL)
#define MPV_CLIENT_API_VERSION MPV_MAKE_VERSION(2, 1)
/**
* The API user is allowed to "#define MPV_ENABLE_DEPRECATED 0" before
* including any libmpv headers. Then deprecated symbols will be excluded
* from the headers. (Of course, deprecated properties and commands and
* other functionality will still work.)
*/
#ifndef MPV_ENABLE_DEPRECATED
#define MPV_ENABLE_DEPRECATED 1
#endif
/**
* Return the MPV_CLIENT_API_VERSION the mpv source has been compiled with.
*/
MPV_EXPORT unsigned long mpv_client_api_version(void);
/**
* Client context used by the client API. Every client has its own private
* handle.
*/
typedef struct mpv_handle mpv_handle;
/**
* List of error codes than can be returned by API functions. 0 and positive
* return values always mean success, negative values are always errors.
*/
typedef enum mpv_error {
/**
* No error happened (used to signal successful operation).
* Keep in mind that many API functions returning error codes can also
* return positive values, which also indicate success. API users can
* hardcode the fact that ">= 0" means success.
*/
MPV_ERROR_SUCCESS = 0,
/**
* The event ringbuffer is full. This means the client is choked, and can't
* receive any events. This can happen when too many asynchronous requests
* have been made, but not answered. Probably never happens in practice,
* unless the mpv core is frozen for some reason, and the client keeps
* making asynchronous requests. (Bugs in the client API implementation
* could also trigger this, e.g. if events become "lost".)
*/
MPV_ERROR_EVENT_QUEUE_FULL = -1,
/**
* Memory allocation failed.
*/
MPV_ERROR_NOMEM = -2,
/**
* The mpv core wasn't configured and initialized yet. See the notes in
* mpv_create().
*/
MPV_ERROR_UNINITIALIZED = -3,
/**
* Generic catch-all error if a parameter is set to an invalid or
* unsupported value. This is used if there is no better error code.
*/
MPV_ERROR_INVALID_PARAMETER = -4,
/**
* Trying to set an option that doesn't exist.
*/
MPV_ERROR_OPTION_NOT_FOUND = -5,
/**
* Trying to set an option using an unsupported MPV_FORMAT.
*/
MPV_ERROR_OPTION_FORMAT = -6,
/**
* Setting the option failed. Typically this happens if the provided option
* value could not be parsed.
*/
MPV_ERROR_OPTION_ERROR = -7,
/**
* The accessed property doesn't exist.
*/
MPV_ERROR_PROPERTY_NOT_FOUND = -8,
/**
* Trying to set or get a property using an unsupported MPV_FORMAT.
*/
MPV_ERROR_PROPERTY_FORMAT = -9,
/**
* The property exists, but is not available. This usually happens when the
* associated subsystem is not active, e.g. querying audio parameters while
* audio is disabled.
*/
MPV_ERROR_PROPERTY_UNAVAILABLE = -10,
/**
* Error setting or getting a property.
*/
MPV_ERROR_PROPERTY_ERROR = -11,
/**
* General error when running a command with mpv_command and similar.
*/
MPV_ERROR_COMMAND = -12,
/**
* Generic error on loading (usually used with mpv_event_end_file.error).
*/
MPV_ERROR_LOADING_FAILED = -13,
/**
* Initializing the audio output failed.
*/
MPV_ERROR_AO_INIT_FAILED = -14,
/**
* Initializing the video output failed.
*/
MPV_ERROR_VO_INIT_FAILED = -15,
/**
* There was no audio or video data to play. This also happens if the
* file was recognized, but did not contain any audio or video streams,
* or no streams were selected.
*/
MPV_ERROR_NOTHING_TO_PLAY = -16,
/**
* When trying to load the file, the file format could not be determined,
* or the file was too broken to open it.
*/
MPV_ERROR_UNKNOWN_FORMAT = -17,
/**
* Generic error for signaling that certain system requirements are not
* fulfilled.
*/
MPV_ERROR_UNSUPPORTED = -18,
/**
* The API function which was called is a stub only.
*/
MPV_ERROR_NOT_IMPLEMENTED = -19,
/**
* Unspecified error.
*/
MPV_ERROR_GENERIC = -20
} mpv_error;
/**
* Return a string describing the error. For unknown errors, the string
* "unknown error" is returned.
*
* @param error error number, see enum mpv_error
* @return A static string describing the error. The string is completely
* static, i.e. doesn't need to be deallocated, and is valid forever.
*/
MPV_EXPORT const char *mpv_error_string(int error);
/**
* General function to deallocate memory returned by some of the API functions.
* Call this only if it's explicitly documented as allowed. Calling this on
* mpv memory not owned by the caller will lead to undefined behavior.
*
* @param data A valid pointer returned by the API, or NULL.
*/
MPV_EXPORT void mpv_free(void *data);
/**
* Return the name of this client handle. Every client has its own unique
* name, which is mostly used for user interface purposes.
*
* @return The client name. The string is read-only and is valid until the
* mpv_handle is destroyed.
*/
MPV_EXPORT const char *mpv_client_name(mpv_handle *ctx);
/**
* Return the ID of this client handle. Every client has its own unique ID. This
* ID is never reused by the core, even if the mpv_handle at hand gets destroyed
* and new handles get allocated.
*
* IDs are never 0 or negative.
*
* Some mpv APIs (not necessarily all) accept a name in the form "@<id>" in
* addition of the proper mpv_client_name(), where "<id>" is the ID in decimal
* form (e.g. "@123"). For example, the "script-message-to" command takes the
* client name as first argument, but also accepts the client ID formatted in
* this manner.
*
* @return The client ID.
*/
MPV_EXPORT int64_t mpv_client_id(mpv_handle *ctx);
/**
* Create a new mpv instance and an associated client API handle to control
* the mpv instance. This instance is in a pre-initialized state,
* and needs to be initialized to be actually used with most other API
* functions.
*
* Some API functions will return MPV_ERROR_UNINITIALIZED in the uninitialized
* state. You can call mpv_set_property() (or mpv_set_property_string() and
* other variants, and before mpv 0.21.0 mpv_set_option() etc.) to set initial
* options. After this, call mpv_initialize() to start the player, and then use
* e.g. mpv_command() to start playback of a file.
*
* The point of separating handle creation and actual initialization is that
* you can configure things which can't be changed during runtime.
*
* Unlike the command line player, this will have initial settings suitable
* for embedding in applications. The following settings are different:
* - stdin/stdout/stderr and the terminal will never be accessed. This is
* equivalent to setting the --no-terminal option.
* (Technically, this also suppresses C signal handling.)
* - No config files will be loaded. This is roughly equivalent to using
* --config=no. Since libmpv 1.15, you can actually re-enable this option,
* which will make libmpv load config files during mpv_initialize(). If you
* do this, you are strongly encouraged to set the "config-dir" option too.
* (Otherwise it will load the mpv command line player's config.)
* For example:
* mpv_set_option_string(mpv, "config-dir", "/my/path"); // set config root
* mpv_set_option_string(mpv, "config", "yes"); // enable config loading
* (call mpv_initialize() _after_ this)
* - Idle mode is enabled, which means the playback core will enter idle mode
* if there are no more files to play on the internal playlist, instead of
* exiting. This is equivalent to the --idle option.
* - Disable parts of input handling.
* - Most of the different settings can be viewed with the command line player
* by running "mpv --show-profile=libmpv".
*
* All this assumes that API users want a mpv instance that is strictly
* isolated from the command line player's configuration, user settings, and
* so on. You can re-enable disabled features by setting the appropriate
* options.
*
* The mpv command line parser is not available through this API, but you can
* set individual options with mpv_set_property(). Files for playback must be
* loaded with mpv_command() or others.
*
* Note that you should avoid doing concurrent accesses on the uninitialized
* client handle. (Whether concurrent access is definitely allowed or not has
* yet to be decided.)
*
* @return a new mpv client API handle. Returns NULL on error. Currently, this
* can happen in the following situations:
* - out of memory
* - LC_NUMERIC is not set to "C" (see general remarks)
*/
MPV_EXPORT mpv_handle *mpv_create(void);
/**
* Initialize an uninitialized mpv instance. If the mpv instance is already
* running, an error is returned.
*
* This function needs to be called to make full use of the client API if the
* client API handle was created with mpv_create().
*
* Only the following options are required to be set _before_ mpv_initialize():
* - options which are only read at initialization time:
* - config
* - config-dir
* - input-conf
* - load-scripts
* - script
* - player-operation-mode
* - input-app-events (OSX)
* - all encoding mode options
*
* @return error code
*/
MPV_EXPORT int mpv_initialize(mpv_handle *ctx);
/**
* Disconnect and destroy the mpv_handle. ctx will be deallocated with this
* API call.
*
* If the last mpv_handle is detached, the core player is destroyed. In
* addition, if there are only weak mpv_handles (such as created by
* mpv_create_weak_client() or internal scripts), these mpv_handles will
* be sent MPV_EVENT_SHUTDOWN. This function may block until these clients
* have responded to the shutdown event, and the core is finally destroyed.
*/
MPV_EXPORT void mpv_destroy(mpv_handle *ctx);
/**
* Similar to mpv_destroy(), but brings the player and all clients down
* as well, and waits until all of them are destroyed. This function blocks. The
* advantage over mpv_destroy() is that while mpv_destroy() merely
* detaches the client handle from the player, this function quits the player,
* waits until all other clients are destroyed (i.e. all mpv_handles are
* detached), and also waits for the final termination of the player.
*
* Since mpv_destroy() is called somewhere on the way, it's not safe to
* call other functions concurrently on the same context.
*
* Since mpv client API version 1.29:
* The first call on any mpv_handle will block until the core is destroyed.
* This means it will wait until other mpv_handle have been destroyed. If you
* want asynchronous destruction, just run the "quit" command, and then react
* to the MPV_EVENT_SHUTDOWN event.
* If another mpv_handle already called mpv_terminate_destroy(), this call will
* not actually block. It will destroy the mpv_handle, and exit immediately,
* while other mpv_handles might still be uninitializing.
*
* Before mpv client API version 1.29:
* If this is called on a mpv_handle that was not created with mpv_create(),
* this function will merely send a quit command and then call
* mpv_destroy(), without waiting for the actual shutdown.
*/
MPV_EXPORT void mpv_terminate_destroy(mpv_handle *ctx);
/**
* Create a new client handle connected to the same player core as ctx. This
* context has its own event queue, its own mpv_request_event() state, its own
* mpv_request_log_messages() state, its own set of observed properties, and
* its own state for asynchronous operations. Otherwise, everything is shared.
*
* This handle should be destroyed with mpv_destroy() if no longer
* needed. The core will live as long as there is at least 1 handle referencing
* it. Any handle can make the core quit, which will result in every handle
* receiving MPV_EVENT_SHUTDOWN.
*
* This function can not be called before the main handle was initialized with
* mpv_initialize(). The new handle is always initialized, unless ctx=NULL was
* passed.
*
* @param ctx Used to get the reference to the mpv core; handle-specific
* settings and parameters are not used.
* If NULL, this function behaves like mpv_create() (ignores name).
* @param name The client name. This will be returned by mpv_client_name(). If
* the name is already in use, or contains non-alphanumeric
* characters (other than '_'), the name is modified to fit.
* If NULL, an arbitrary name is automatically chosen.
* @return a new handle, or NULL on error
*/
MPV_EXPORT mpv_handle *mpv_create_client(mpv_handle *ctx, const char *name);
/**
* This is the same as mpv_create_client(), but the created mpv_handle is
* treated as a weak reference. If all mpv_handles referencing a core are
* weak references, the core is automatically destroyed. (This still goes
* through normal uninit of course. Effectively, if the last non-weak mpv_handle
* is destroyed, then the weak mpv_handles receive MPV_EVENT_SHUTDOWN and are
* asked to terminate as well.)
*
* Note if you want to use this like refcounting: you have to be aware that
* mpv_terminate_destroy() _and_ mpv_destroy() for the last non-weak
* mpv_handle will block until all weak mpv_handles are destroyed.
*/
MPV_EXPORT mpv_handle *mpv_create_weak_client(mpv_handle *ctx, const char *name);
/**
* Load a config file. This loads and parses the file, and sets every entry in
* the config file's default section as if mpv_set_option_string() is called.
*
* The filename should be an absolute path. If it isn't, the actual path used
* is unspecified. (Note: an absolute path starts with '/' on UNIX.) If the
* file wasn't found, MPV_ERROR_INVALID_PARAMETER is returned.
*
* If a fatal error happens when parsing a config file, MPV_ERROR_OPTION_ERROR
* is returned. Errors when setting options as well as other types or errors
* are ignored (even if options do not exist). You can still try to capture
* the resulting error messages with mpv_request_log_messages(). Note that it's
* possible that some options were successfully set even if any of these errors
* happen.
*
* @param filename absolute path to the config file on the local filesystem
* @return error code
*/
MPV_EXPORT int mpv_load_config_file(mpv_handle *ctx, const char *filename);
/**
* Return the internal time in microseconds. This has an arbitrary start offset,
* but will never wrap or go backwards.
*
* Note that this is always the real time, and doesn't necessarily have to do
* with playback time. For example, playback could go faster or slower due to
* playback speed, or due to playback being paused. Use the "time-pos" property
* instead to get the playback status.
*
* Unlike other libmpv APIs, this can be called at absolutely any time (even
* within wakeup callbacks), as long as the context is valid.
*
* Safe to be called from mpv render API threads.
*/
MPV_EXPORT int64_t mpv_get_time_us(mpv_handle *ctx);
/**
* Data format for options and properties. The API functions to get/set
* properties and options support multiple formats, and this enum describes
* them.
*/
typedef enum mpv_format {
/**
* Invalid. Sometimes used for empty values. This is always defined to 0,
* so a normal 0-init of mpv_format (or e.g. mpv_node) is guaranteed to set
* this it to MPV_FORMAT_NONE (which makes some things saner as consequence).
*/
MPV_FORMAT_NONE = 0,
/**
* The basic type is char*. It returns the raw property string, like
* using ${=property} in input.conf (see input.rst).
*
* NULL isn't an allowed value.
*
* Warning: although the encoding is usually UTF-8, this is not always the
* case. File tags often store strings in some legacy codepage,
* and even filenames don't necessarily have to be in UTF-8 (at
* least on Linux). If you pass the strings to code that requires
* valid UTF-8, you have to sanitize it in some way.
* On Windows, filenames are always UTF-8, and libmpv converts
* between UTF-8 and UTF-16 when using win32 API functions. See
* the "Encoding of filenames" section for details.
*
* Example for reading:
*
* char *result = NULL;
* if (mpv_get_property(ctx, "property", MPV_FORMAT_STRING, &result) < 0)
* goto error;
* printf("%s\n", result);
* mpv_free(result);
*
* Or just use mpv_get_property_string().
*
* Example for writing:
*
* char *value = "the new value";
* // yep, you pass the address to the variable
* // (needed for symmetry with other types and mpv_get_property)
* mpv_set_property(ctx, "property", MPV_FORMAT_STRING, &value);
*
* Or just use mpv_set_property_string().
*
*/
MPV_FORMAT_STRING = 1,
/**
* The basic type is char*. It returns the OSD property string, like
* using ${property} in input.conf (see input.rst). In many cases, this
* is the same as the raw string, but in other cases it's formatted for
* display on OSD. It's intended to be human readable. Do not attempt to
* parse these strings.
*
* Only valid when doing read access. The rest works like MPV_FORMAT_STRING.
*/
MPV_FORMAT_OSD_STRING = 2,
/**
* The basic type is int. The only allowed values are 0 ("no")
* and 1 ("yes").
*
* Example for reading:
*
* int result;
* if (mpv_get_property(ctx, "property", MPV_FORMAT_FLAG, &result) < 0)
* goto error;
* printf("%s\n", result ? "true" : "false");
*
* Example for writing:
*
* int flag = 1;
* mpv_set_property(ctx, "property", MPV_FORMAT_FLAG, &flag);
*/
MPV_FORMAT_FLAG = 3,
/**
* The basic type is int64_t.
*/
MPV_FORMAT_INT64 = 4,
/**
* The basic type is double.
*/
MPV_FORMAT_DOUBLE = 5,
/**
* The type is mpv_node.
*
* For reading, you usually would pass a pointer to a stack-allocated
* mpv_node value to mpv, and when you're done you call
* mpv_free_node_contents(&node).
* You're expected not to write to the data - if you have to, copy it
* first (which you have to do manually).
*
* For writing, you construct your own mpv_node, and pass a pointer to the
* API. The API will never write to your data (and copy it if needed), so
* you're free to use any form of allocation or memory management you like.
*
* Warning: when reading, always check the mpv_node.format member. For
* example, properties might change their type in future versions
* of mpv, or sometimes even during runtime.
*
* Example for reading:
*
* mpv_node result;
* if (mpv_get_property(ctx, "property", MPV_FORMAT_NODE, &result) < 0)
* goto error;
* printf("format=%d\n", (int)result.format);
* mpv_free_node_contents(&result).
*
* Example for writing:
*
* mpv_node value;
* value.format = MPV_FORMAT_STRING;
* value.u.string = "hello";
* mpv_set_property(ctx, "property", MPV_FORMAT_NODE, &value);
*/
MPV_FORMAT_NODE = 6,
/**
* Used with mpv_node only. Can usually not be used directly.
*/
MPV_FORMAT_NODE_ARRAY = 7,
/**
* See MPV_FORMAT_NODE_ARRAY.
*/
MPV_FORMAT_NODE_MAP = 8,
/**
* A raw, untyped byte array. Only used only with mpv_node, and only in
* some very specific situations. (Some commands use it.)
*/
MPV_FORMAT_BYTE_ARRAY = 9
} mpv_format;
/**
* Generic data storage.
*
* If mpv writes this struct (e.g. via mpv_get_property()), you must not change
* the data. In some cases (mpv_get_property()), you have to free it with
* mpv_free_node_contents(). If you fill this struct yourself, you're also
* responsible for freeing it, and you must not call mpv_free_node_contents().
*/
typedef struct mpv_node {
union {
char *string; /** valid if format==MPV_FORMAT_STRING */
int flag; /** valid if format==MPV_FORMAT_FLAG */
int64_t int64; /** valid if format==MPV_FORMAT_INT64 */
double double_; /** valid if format==MPV_FORMAT_DOUBLE */
/**
* valid if format==MPV_FORMAT_NODE_ARRAY
* or if format==MPV_FORMAT_NODE_MAP
*/
struct mpv_node_list *list;
/**
* valid if format==MPV_FORMAT_BYTE_ARRAY
*/
struct mpv_byte_array *ba;
} u;
/**
* Type of the data stored in this struct. This value rules what members in
* the given union can be accessed. The following formats are currently
* defined to be allowed in mpv_node:
*
* MPV_FORMAT_STRING (u.string)
* MPV_FORMAT_FLAG (u.flag)
* MPV_FORMAT_INT64 (u.int64)
* MPV_FORMAT_DOUBLE (u.double_)
* MPV_FORMAT_NODE_ARRAY (u.list)
* MPV_FORMAT_NODE_MAP (u.list)
* MPV_FORMAT_BYTE_ARRAY (u.ba)
* MPV_FORMAT_NONE (no member)
*
* If you encounter a value you don't know, you must not make any
* assumptions about the contents of union u.
*/
mpv_format format;
} mpv_node;
/**
* (see mpv_node)
*/
typedef struct mpv_node_list {
/**
* Number of entries. Negative values are not allowed.
*/
int num;
/**
* MPV_FORMAT_NODE_ARRAY:
* values[N] refers to value of the Nth item
*
* MPV_FORMAT_NODE_MAP:
* values[N] refers to value of the Nth key/value pair
*
* If num > 0, values[0] to values[num-1] (inclusive) are valid.
* Otherwise, this can be NULL.
*/
mpv_node *values;
/**
* MPV_FORMAT_NODE_ARRAY:
* unused (typically NULL), access is not allowed
*
* MPV_FORMAT_NODE_MAP:
* keys[N] refers to key of the Nth key/value pair. If num > 0, keys[0] to
* keys[num-1] (inclusive) are valid. Otherwise, this can be NULL.
* The keys are in random order. The only guarantee is that keys[N] belongs
* to the value values[N]. NULL keys are not allowed.
*/
char **keys;
} mpv_node_list;
/**
* (see mpv_node)
*/
typedef struct mpv_byte_array {
/**
* Pointer to the data. In what format the data is stored is up to whatever
* uses MPV_FORMAT_BYTE_ARRAY.
*/
void *data;
/**
* Size of the data pointed to by ptr.
*/
size_t size;
} mpv_byte_array;
/**
* Frees any data referenced by the node. It doesn't free the node itself.
* Call this only if the mpv client API set the node. If you constructed the
* node yourself (manually), you have to free it yourself.
*
* If node->format is MPV_FORMAT_NONE, this call does nothing. Likewise, if
* the client API sets a node with this format, this function doesn't need to
* be called. (This is just a clarification that there's no danger of anything
* strange happening in these cases.)
*/
MPV_EXPORT void mpv_free_node_contents(mpv_node *node);
/**
* Set an option. Note that you can't normally set options during runtime. It
* works in uninitialized state (see mpv_create()), and in some cases in at
* runtime.
*
* Using a format other than MPV_FORMAT_NODE is equivalent to constructing a
* mpv_node with the given format and data, and passing the mpv_node to this
* function.
*
* Note: this is semi-deprecated. For most purposes, this is not needed anymore.
* Starting with mpv version 0.21.0 (version 1.23) most options can be set
* with mpv_set_property() (and related functions), and even before
* mpv_initialize(). In some obscure corner cases, using this function
* to set options might still be required (see
* "Inconsistencies between options and properties" in the manpage). Once
* these are resolved, the option setting functions might be fully
* deprecated.
*
* @param name Option name. This is the same as on the mpv command line, but
* without the leading "--".
* @param format see enum mpv_format.
* @param[in] data Option value (according to the format).
* @return error code
*/
MPV_EXPORT int mpv_set_option(mpv_handle *ctx, const char *name, mpv_format format,
void *data);
/**
* Convenience function to set an option to a string value. This is like
* calling mpv_set_option() with MPV_FORMAT_STRING.
*
* @return error code
*/
MPV_EXPORT int mpv_set_option_string(mpv_handle *ctx, const char *name, const char *data);
/**
* Send a command to the player. Commands are the same as those used in
* input.conf, except that this function takes parameters in a pre-split
* form.
*
* The commands and their parameters are documented in input.rst.
*
* Does not use OSD and string expansion by default (unlike mpv_command_string()
* and input.conf).
*
* @param[in] args NULL-terminated list of strings. Usually, the first item
* is the command, and the following items are arguments.
* @return error code
*/
MPV_EXPORT int mpv_command(mpv_handle *ctx, const char **args);
/**
* Same as mpv_command(), but allows passing structured data in any format.
* In particular, calling mpv_command() is exactly like calling
* mpv_command_node() with the format set to MPV_FORMAT_NODE_ARRAY, and
* every arg passed in order as MPV_FORMAT_STRING.
*
* Does not use OSD and string expansion by default.
*
* The args argument can have one of the following formats:
*
* MPV_FORMAT_NODE_ARRAY:
* Positional arguments. Each entry is an argument using an arbitrary
* format (the format must be compatible to the used command). Usually,
* the first item is the command name (as MPV_FORMAT_STRING). The order
* of arguments is as documented in each command description.
*
* MPV_FORMAT_NODE_MAP:
* Named arguments. This requires at least an entry with the key "name"
* to be present, which must be a string, and contains the command name.
* The special entry "_flags" is optional, and if present, must be an
* array of strings, each being a command prefix to apply. All other
* entries are interpreted as arguments. They must use the argument names
* as documented in each command description. Some commands do not
* support named arguments at all, and must use MPV_FORMAT_NODE_ARRAY.
*
* @param[in] args mpv_node with format set to one of the values documented
* above (see there for details)
* @param[out] result Optional, pass NULL if unused. If not NULL, and if the
* function succeeds, this is set to command-specific return
* data. You must call mpv_free_node_contents() to free it
* (again, only if the command actually succeeds).
* Not many commands actually use this at all.
* @return error code (the result parameter is not set on error)
*/
MPV_EXPORT int mpv_command_node(mpv_handle *ctx, mpv_node *args, mpv_node *result);
/**
* This is essentially identical to mpv_command() but it also returns a result.
*
* Does not use OSD and string expansion by default.
*
* @param[in] args NULL-terminated list of strings. Usually, the first item
* is the command, and the following items are arguments.
* @param[out] result Optional, pass NULL if unused. If not NULL, and if the
* function succeeds, this is set to command-specific return
* data. You must call mpv_free_node_contents() to free it
* (again, only if the command actually succeeds).
* Not many commands actually use this at all.
* @return error code (the result parameter is not set on error)
*/
MPV_EXPORT int mpv_command_ret(mpv_handle *ctx, const char **args, mpv_node *result);
/**
* Same as mpv_command, but use input.conf parsing for splitting arguments.
* This is slightly simpler, but also more error prone, since arguments may
* need quoting/escaping.
*
* This also has OSD and string expansion enabled by default.
*/
MPV_EXPORT int mpv_command_string(mpv_handle *ctx, const char *args);
/**
* Same as mpv_command, but run the command asynchronously.
*
* Commands are executed asynchronously. You will receive a
* MPV_EVENT_COMMAND_REPLY event. This event will also have an
* error code set if running the command failed. For commands that
* return data, the data is put into mpv_event_command.result.
*
* The only case when you do not receive an event is when the function call
* itself fails. This happens only if parsing the command itself (or otherwise
* validating it) fails, i.e. the return code of the API call is not 0 or
* positive.
*
* Safe to be called from mpv render API threads.
*
* @param reply_userdata the value mpv_event.reply_userdata of the reply will
* be set to (see section about asynchronous calls)
* @param args NULL-terminated list of strings (see mpv_command())
* @return error code (if parsing or queuing the command fails)
*/
MPV_EXPORT int mpv_command_async(mpv_handle *ctx, uint64_t reply_userdata,
const char **args);
/**
* Same as mpv_command_node(), but run it asynchronously. Basically, this
* function is to mpv_command_node() what mpv_command_async() is to
* mpv_command().
*
* See mpv_command_async() for details.
*
* Safe to be called from mpv render API threads.
*
* @param reply_userdata the value mpv_event.reply_userdata of the reply will
* be set to (see section about asynchronous calls)
* @param args as in mpv_command_node()
* @return error code (if parsing or queuing the command fails)
*/
MPV_EXPORT int mpv_command_node_async(mpv_handle *ctx, uint64_t reply_userdata,
mpv_node *args);
/**
* Signal to all async requests with the matching ID to abort. This affects
* the following API calls:
*
* mpv_command_async
* mpv_command_node_async
*
* All of these functions take a reply_userdata parameter. This API function
* tells all requests with the matching reply_userdata value to try to return
* as soon as possible. If there are multiple requests with matching ID, it
* aborts all of them.
*
* This API function is mostly asynchronous itself. It will not wait until the
* command is aborted. Instead, the command will terminate as usual, but with
* some work not done. How this is signaled depends on the specific command (for
* example, the "subprocess" command will indicate it by "killed_by_us" set to
* true in the result). How long it takes also depends on the situation. The
* aborting process is completely asynchronous.
*
* Not all commands may support this functionality. In this case, this function
* will have no effect. The same is true if the request using the passed
* reply_userdata has already terminated, has not been started yet, or was
* never in use at all.
*
* You have to be careful of race conditions: the time during which the abort
* request will be effective is _after_ e.g. mpv_command_async() has returned,
* and before the command has signaled completion with MPV_EVENT_COMMAND_REPLY.
*
* @param reply_userdata ID of the request to be aborted (see above)
*/
MPV_EXPORT void mpv_abort_async_command(mpv_handle *ctx, uint64_t reply_userdata);
/**
* Set a property to a given value. Properties are essentially variables which
* can be queried or set at runtime. For example, writing to the pause property
* will actually pause or unpause playback.
*
* If the format doesn't match with the internal format of the property, access
* usually will fail with MPV_ERROR_PROPERTY_FORMAT. In some cases, the data
* is automatically converted and access succeeds. For example, MPV_FORMAT_INT64
* is always converted to MPV_FORMAT_DOUBLE, and access using MPV_FORMAT_STRING
* usually invokes a string parser. The same happens when calling this function
* with MPV_FORMAT_NODE: the underlying format may be converted to another
* type if possible.
*
* Using a format other than MPV_FORMAT_NODE is equivalent to constructing a
* mpv_node with the given format and data, and passing the mpv_node to this
* function. (Before API version 1.21, this was different.)
*
* Note: starting with mpv 0.21.0 (client API version 1.23), this can be used to
* set options in general. It even can be used before mpv_initialize()
* has been called. If called before mpv_initialize(), setting properties
* not backed by options will result in MPV_ERROR_PROPERTY_UNAVAILABLE.
* In some cases, properties and options still conflict. In these cases,
* mpv_set_property() accesses the options before mpv_initialize(), and
* the properties after mpv_initialize(). These conflicts will be removed
* in mpv 0.23.0. See mpv_set_option() for further remarks.
*
* @param name The property name. See input.rst for a list of properties.
* @param format see enum mpv_format.
* @param[in] data Option value.
* @return error code
*/
MPV_EXPORT int mpv_set_property(mpv_handle *ctx, const char *name, mpv_format format,
void *data);
/**
* Convenience function to set a property to a string value.
*
* This is like calling mpv_set_property() with MPV_FORMAT_STRING.
*/
MPV_EXPORT int mpv_set_property_string(mpv_handle *ctx, const char *name, const char *data);
/**
* Convenience function to delete a property.
*
* This is equivalent to running the command "del [name]".
*
* @param name The property name. See input.rst for a list of properties.
* @return error code
*/
MPV_EXPORT int mpv_del_property(mpv_handle *ctx, const char *name);
/**
* Set a property asynchronously. You will receive the result of the operation
* as MPV_EVENT_SET_PROPERTY_REPLY event. The mpv_event.error field will contain
* the result status of the operation. Otherwise, this function is similar to
* mpv_set_property().
*
* Safe to be called from mpv render API threads.
*
* @param reply_userdata see section about asynchronous calls
* @param name The property name.
* @param format see enum mpv_format.
* @param[in] data Option value. The value will be copied by the function. It
* will never be modified by the client API.
* @return error code if sending the request failed
*/
MPV_EXPORT int mpv_set_property_async(mpv_handle *ctx, uint64_t reply_userdata,
const char *name, mpv_format format, void *data);
/**
* Read the value of the given property.
*
* If the format doesn't match with the internal format of the property, access
* usually will fail with MPV_ERROR_PROPERTY_FORMAT. In some cases, the data
* is automatically converted and access succeeds. For example, MPV_FORMAT_INT64
* is always converted to MPV_FORMAT_DOUBLE, and access using MPV_FORMAT_STRING
* usually invokes a string formatter.
*
* @param name The property name.
* @param format see enum mpv_format.
* @param[out] data Pointer to the variable holding the option value. On
* success, the variable will be set to a copy of the option
* value. For formats that require dynamic memory allocation,
* you can free the value with mpv_free() (strings) or
* mpv_free_node_contents() (MPV_FORMAT_NODE).
* @return error code
*/
MPV_EXPORT int mpv_get_property(mpv_handle *ctx, const char *name, mpv_format format,
void *data);
/**
* Return the value of the property with the given name as string. This is
* equivalent to mpv_get_property() with MPV_FORMAT_STRING.
*
* See MPV_FORMAT_STRING for character encoding issues.
*
* On error, NULL is returned. Use mpv_get_property() if you want fine-grained
* error reporting.
*
* @param name The property name.
* @return Property value, or NULL if the property can't be retrieved. Free
* the string with mpv_free().
*/
MPV_EXPORT char *mpv_get_property_string(mpv_handle *ctx, const char *name);
/**
* Return the property as "OSD" formatted string. This is the same as
* mpv_get_property_string, but using MPV_FORMAT_OSD_STRING.
*
* @return Property value, or NULL if the property can't be retrieved. Free
* the string with mpv_free().
*/
MPV_EXPORT char *mpv_get_property_osd_string(mpv_handle *ctx, const char *name);
/**
* Get a property asynchronously. You will receive the result of the operation
* as well as the property data with the MPV_EVENT_GET_PROPERTY_REPLY event.
* You should check the mpv_event.error field on the reply event.
*
* Safe to be called from mpv render API threads.
*
* @param reply_userdata see section about asynchronous calls
* @param name The property name.
* @param format see enum mpv_format.
* @return error code if sending the request failed
*/
MPV_EXPORT int mpv_get_property_async(mpv_handle *ctx, uint64_t reply_userdata,
const char *name, mpv_format format);
/**
* Get a notification whenever the given property changes. You will receive
* updates as MPV_EVENT_PROPERTY_CHANGE. Note that this is not very precise:
* for some properties, it may not send updates even if the property changed.
* This depends on the property, and it's a valid feature request to ask for
* better update handling of a specific property. (For some properties, like
* ``clock``, which shows the wall clock, this mechanism doesn't make too
* much sense anyway.)
*
* Property changes are coalesced: the change events are returned only once the
* event queue becomes empty (e.g. mpv_wait_event() would block or return
* MPV_EVENT_NONE), and then only one event per changed property is returned.
*
* You always get an initial change notification. This is meant to initialize
* the user's state to the current value of the property.
*
* Normally, change events are sent only if the property value changes according
* to the requested format. mpv_event_property will contain the property value
* as data member.
*
* Warning: if a property is unavailable or retrieving it caused an error,
* MPV_FORMAT_NONE will be set in mpv_event_property, even if the
* format parameter was set to a different value. In this case, the
* mpv_event_property.data field is invalid.
*
* If the property is observed with the format parameter set to MPV_FORMAT_NONE,
* you get low-level notifications whether the property _may_ have changed, and
* the data member in mpv_event_property will be unset. With this mode, you
* will have to determine yourself whether the property really changed. On the
* other hand, this mechanism can be faster and uses less resources.
*
* Observing a property that doesn't exist is allowed. (Although it may still
* cause some sporadic change events.)
*
* Keep in mind that you will get change notifications even if you change a
* property yourself. Try to avoid endless feedback loops, which could happen
* if you react to the change notifications triggered by your own change.
*
* Only the mpv_handle on which this was called will receive the property
* change events, or can unobserve them.
*
* Safe to be called from mpv render API threads.
*
* @param reply_userdata This will be used for the mpv_event.reply_userdata
* field for the received MPV_EVENT_PROPERTY_CHANGE
* events. (Also see section about asynchronous calls,
* although this function is somewhat different from
* actual asynchronous calls.)
* If you have no use for this, pass 0.
* Also see mpv_unobserve_property().
* @param name The property name.
* @param format see enum mpv_format. Can be MPV_FORMAT_NONE to omit values
* from the change events.
* @return error code (usually fails only on OOM or unsupported format)
*/
MPV_EXPORT int mpv_observe_property(mpv_handle *mpv, uint64_t reply_userdata,
const char *name, mpv_format format);
/**
* Undo mpv_observe_property(). This will remove all observed properties for
* which the given number was passed as reply_userdata to mpv_observe_property.
*
* Safe to be called from mpv render API threads.
*
* @param registered_reply_userdata ID that was passed to mpv_observe_property
* @return negative value is an error code, >=0 is number of removed properties
* on success (includes the case when 0 were removed)
*/
MPV_EXPORT int mpv_unobserve_property(mpv_handle *mpv, uint64_t registered_reply_userdata);
typedef enum mpv_event_id {
/**
* Nothing happened. Happens on timeouts or sporadic wakeups.
*/
MPV_EVENT_NONE = 0,
/**
* Happens when the player quits. The player enters a state where it tries
* to disconnect all clients. Most requests to the player will fail, and
* the client should react to this and quit with mpv_destroy() as soon as
* possible.
*/
MPV_EVENT_SHUTDOWN = 1,
/**
* See mpv_request_log_messages().
*/
MPV_EVENT_LOG_MESSAGE = 2,
/**
* Reply to a mpv_get_property_async() request.
* See also mpv_event and mpv_event_property.
*/
MPV_EVENT_GET_PROPERTY_REPLY = 3,
/**
* Reply to a mpv_set_property_async() request.
* (Unlike MPV_EVENT_GET_PROPERTY, mpv_event_property is not used.)
*/
MPV_EVENT_SET_PROPERTY_REPLY = 4,
/**
* Reply to a mpv_command_async() or mpv_command_node_async() request.
* See also mpv_event and mpv_event_command.
*/
MPV_EVENT_COMMAND_REPLY = 5,
/**
* Notification before playback start of a file (before the file is loaded).
* See also mpv_event and mpv_event_start_file.
*/
MPV_EVENT_START_FILE = 6,
/**
* Notification after playback end (after the file was unloaded).
* See also mpv_event and mpv_event_end_file.
*/
MPV_EVENT_END_FILE = 7,
/**
* Notification when the file has been loaded (headers were read etc.), and
* decoding starts.
*/
MPV_EVENT_FILE_LOADED = 8,
#if MPV_ENABLE_DEPRECATED
/**
* Idle mode was entered. In this mode, no file is played, and the playback
* core waits for new commands. (The command line player normally quits
* instead of entering idle mode, unless --idle was specified. If mpv
* was started with mpv_create(), idle mode is enabled by default.)
*
* @deprecated This is equivalent to using mpv_observe_property() on the
* "idle-active" property. The event is redundant, and might be
* removed in the far future. As a further warning, this event
* is not necessarily sent at the right point anymore (at the
* start of the program), while the property behaves correctly.
*/
MPV_EVENT_IDLE = 11,
/**
* Sent every time after a video frame is displayed. Note that currently,
* this will be sent in lower frequency if there is no video, or playback
* is paused - but that will be removed in the future, and it will be
* restricted to video frames only.
*
* @deprecated Use mpv_observe_property() with relevant properties instead
* (such as "playback-time").
*/
MPV_EVENT_TICK = 14,
#endif
/**
* Triggered by the script-message input command. The command uses the
* first argument of the command as client name (see mpv_client_name()) to
* dispatch the message, and passes along all arguments starting from the
* second argument as strings.
* See also mpv_event and mpv_event_client_message.
*/
MPV_EVENT_CLIENT_MESSAGE = 16,
/**
* Happens after video changed in some way. This can happen on resolution
* changes, pixel format changes, or video filter changes. The event is
* sent after the video filters and the VO are reconfigured. Applications
* embedding a mpv window should listen to this event in order to resize
* the window if needed.
* Note that this event can happen sporadically, and you should check
* yourself whether the video parameters really changed before doing
* something expensive.
*/
MPV_EVENT_VIDEO_RECONFIG = 17,
/**
* Similar to MPV_EVENT_VIDEO_RECONFIG. This is relatively uninteresting,
* because there is no such thing as audio output embedding.
*/
MPV_EVENT_AUDIO_RECONFIG = 18,
/**
* Happens when a seek was initiated. Playback stops. Usually it will
* resume with MPV_EVENT_PLAYBACK_RESTART as soon as the seek is finished.
*/
MPV_EVENT_SEEK = 20,
/**
* There was a discontinuity of some sort (like a seek), and playback
* was reinitialized. Usually happens on start of playback and after
* seeking. The main purpose is allowing the client to detect when a seek
* request is finished.
*/
MPV_EVENT_PLAYBACK_RESTART = 21,
/**
* Event sent due to mpv_observe_property().
* See also mpv_event and mpv_event_property.
*/
MPV_EVENT_PROPERTY_CHANGE = 22,
/**
* Happens if the internal per-mpv_handle ringbuffer overflows, and at
* least 1 event had to be dropped. This can happen if the client doesn't
* read the event queue quickly enough with mpv_wait_event(), or if the
* client makes a very large number of asynchronous calls at once.
*
* Event delivery will continue normally once this event was returned
* (this forces the client to empty the queue completely).
*/
MPV_EVENT_QUEUE_OVERFLOW = 24,
/**
* Triggered if a hook handler was registered with mpv_hook_add(), and the
* hook is invoked. If you receive this, you must handle it, and continue
* the hook with mpv_hook_continue().
* See also mpv_event and mpv_event_hook.
*/
MPV_EVENT_HOOK = 25,
// Internal note: adjust INTERNAL_EVENT_BASE when adding new events.
} mpv_event_id;
/**
* Return a string describing the event. For unknown events, NULL is returned.
*
* Note that all events actually returned by the API will also yield a non-NULL
* string with this function.
*
* @param event event ID, see see enum mpv_event_id
* @return A static string giving a short symbolic name of the event. It
* consists of lower-case alphanumeric characters and can include "-"
* characters. This string is suitable for use in e.g. scripting
* interfaces.
* The string is completely static, i.e. doesn't need to be deallocated,
* and is valid forever.
*/
MPV_EXPORT const char *mpv_event_name(mpv_event_id event);
typedef struct mpv_event_property {
/**
* Name of the property.
*/
const char *name;
/**
* Format of the data field in the same struct. See enum mpv_format.
* This is always the same format as the requested format, except when
* the property could not be retrieved (unavailable, or an error happened),
* in which case the format is MPV_FORMAT_NONE.
*/
mpv_format format;
/**
* Received property value. Depends on the format. This is like the
* pointer argument passed to mpv_get_property().
*
* For example, for MPV_FORMAT_STRING you get the string with:
*
* char *value = *(char **)(event_property->data);
*
* Note that this is set to NULL if retrieving the property failed (the
* format will be MPV_FORMAT_NONE).
*/
void *data;
} mpv_event_property;
/**
* Numeric log levels. The lower the number, the more important the message is.
* MPV_LOG_LEVEL_NONE is never used when receiving messages. The string in
* the comment after the value is the name of the log level as used for the
* mpv_request_log_messages() function.
* Unused numeric values are unused, but reserved for future use.
*/
typedef enum mpv_log_level {
MPV_LOG_LEVEL_NONE = 0, /// "no" - disable absolutely all messages
MPV_LOG_LEVEL_FATAL = 10, /// "fatal" - critical/aborting errors
MPV_LOG_LEVEL_ERROR = 20, /// "error" - simple errors
MPV_LOG_LEVEL_WARN = 30, /// "warn" - possible problems
MPV_LOG_LEVEL_INFO = 40, /// "info" - informational message
MPV_LOG_LEVEL_V = 50, /// "v" - noisy informational message
MPV_LOG_LEVEL_DEBUG = 60, /// "debug" - very noisy technical information
MPV_LOG_LEVEL_TRACE = 70, /// "trace" - extremely noisy
} mpv_log_level;
typedef struct mpv_event_log_message {
/**
* The module prefix, identifies the sender of the message. As a special
* case, if the message buffer overflows, this will be set to the string
* "overflow" (which doesn't appear as prefix otherwise), and the text
* field will contain an informative message.
*/
const char *prefix;
/**
* The log level as string. See mpv_request_log_messages() for possible
* values. The level "no" is never used here.
*/
const char *level;
/**
* The log message. It consists of 1 line of text, and is terminated with
* a newline character. (Before API version 1.6, it could contain multiple
* or partial lines.)
*/
const char *text;
/**
* The same contents as the level field, but as a numeric ID.
* Since API version 1.6.
*/
mpv_log_level log_level;
} mpv_event_log_message;
/// Since API version 1.9.
typedef enum mpv_end_file_reason {
/**
* The end of file was reached. Sometimes this may also happen on
* incomplete or corrupted files, or if the network connection was
* interrupted when playing a remote file. It also happens if the
* playback range was restricted with --end or --frames or similar.
*/
MPV_END_FILE_REASON_EOF = 0,
/**
* Playback was stopped by an external action (e.g. playlist controls).
*/
MPV_END_FILE_REASON_STOP = 2,
/**
* Playback was stopped by the quit command or player shutdown.
*/
MPV_END_FILE_REASON_QUIT = 3,
/**
* Some kind of error happened that lead to playback abort. Does not
* necessarily happen on incomplete or broken files (in these cases, both
* MPV_END_FILE_REASON_ERROR or MPV_END_FILE_REASON_EOF are possible).
*
* mpv_event_end_file.error will be set.
*/
MPV_END_FILE_REASON_ERROR = 4,
/**
* The file was a playlist or similar. When the playlist is read, its
* entries will be appended to the playlist after the entry of the current
* file, the entry of the current file is removed, and a MPV_EVENT_END_FILE
* event is sent with reason set to MPV_END_FILE_REASON_REDIRECT. Then
* playback continues with the playlist contents.
* Since API version 1.18.
*/
MPV_END_FILE_REASON_REDIRECT = 5,
} mpv_end_file_reason;
/// Since API version 1.108.
typedef struct mpv_event_start_file {
/**
* Playlist entry ID of the file being loaded now.
*/
int64_t playlist_entry_id;
} mpv_event_start_file;
typedef struct mpv_event_end_file {
/**
* Corresponds to the values in enum mpv_end_file_reason.
*
* Unknown values should be treated as unknown.
*/
mpv_end_file_reason reason;
/**
* If reason==MPV_END_FILE_REASON_ERROR, this contains a mpv error code
* (one of MPV_ERROR_...) giving an approximate reason why playback
* failed. In other cases, this field is 0 (no error).
* Since API version 1.9.
*/
int error;
/**
* Playlist entry ID of the file that was being played or attempted to be
* played. This has the same value as the playlist_entry_id field in the
* corresponding mpv_event_start_file event.
* Since API version 1.108.
*/
int64_t playlist_entry_id;
/**
* If loading ended, because the playlist entry to be played was for example
* a playlist, and the current playlist entry is replaced with a number of
* other entries. This may happen at least with MPV_END_FILE_REASON_REDIRECT
* (other event types may use this for similar but different purposes in the
* future). In this case, playlist_insert_id will be set to the playlist
* entry ID of the first inserted entry, and playlist_insert_num_entries to
* the total number of inserted playlist entries. Note this in this specific
* case, the ID of the last inserted entry is playlist_insert_id+num-1.
* Beware that depending on circumstances, you may observe the new playlist
* entries before seeing the event (e.g. reading the "playlist" property or
* getting a property change notification before receiving the event).
* Since API version 1.108.
*/
int64_t playlist_insert_id;
/**
* See playlist_insert_id. Only non-0 if playlist_insert_id is valid. Never
* negative.
* Since API version 1.108.
*/
int playlist_insert_num_entries;
} mpv_event_end_file;
typedef struct mpv_event_client_message {
/**
* Arbitrary arguments chosen by the sender of the message. If num_args > 0,
* you can access args[0] through args[num_args - 1] (inclusive). What
* these arguments mean is up to the sender and receiver.
* None of the valid items are NULL.
*/
int num_args;
const char **args;
} mpv_event_client_message;
typedef struct mpv_event_hook {
/**
* The hook name as passed to mpv_hook_add().
*/
const char *name;
/**
* Internal ID that must be passed to mpv_hook_continue().
*/
uint64_t id;
} mpv_event_hook;
// Since API version 1.102.
typedef struct mpv_event_command {
/**
* Result data of the command. Note that success/failure is signaled
* separately via mpv_event.error. This field is only for result data
* in case of success. Most commands leave it at MPV_FORMAT_NONE. Set
* to MPV_FORMAT_NONE on failure.
*/
mpv_node result;
} mpv_event_command;
typedef struct mpv_event {
/**
* One of mpv_event. Keep in mind that later ABI compatible releases might
* add new event types. These should be ignored by the API user.
*/
mpv_event_id event_id;
/**
* This is mainly used for events that are replies to (asynchronous)
* requests. It contains a status code, which is >= 0 on success, or < 0
* on error (a mpv_error value). Usually, this will be set if an
* asynchronous request fails.
* Used for:
* MPV_EVENT_GET_PROPERTY_REPLY
* MPV_EVENT_SET_PROPERTY_REPLY
* MPV_EVENT_COMMAND_REPLY
*/
int error;
/**
* If the event is in reply to a request (made with this API and this
* API handle), this is set to the reply_userdata parameter of the request
* call. Otherwise, this field is 0.
* Used for:
* MPV_EVENT_GET_PROPERTY_REPLY
* MPV_EVENT_SET_PROPERTY_REPLY
* MPV_EVENT_COMMAND_REPLY
* MPV_EVENT_PROPERTY_CHANGE
* MPV_EVENT_HOOK
*/
uint64_t reply_userdata;
/**
* The meaning and contents of the data member depend on the event_id:
* MPV_EVENT_GET_PROPERTY_REPLY: mpv_event_property*
* MPV_EVENT_PROPERTY_CHANGE: mpv_event_property*
* MPV_EVENT_LOG_MESSAGE: mpv_event_log_message*
* MPV_EVENT_CLIENT_MESSAGE: mpv_event_client_message*
* MPV_EVENT_START_FILE: mpv_event_start_file* (since v1.108)
* MPV_EVENT_END_FILE: mpv_event_end_file*
* MPV_EVENT_HOOK: mpv_event_hook*
* MPV_EVENT_COMMAND_REPLY* mpv_event_command*
* other: NULL
*
* Note: future enhancements might add new event structs for existing or new
* event types.
*/
void *data;
} mpv_event;
/**
* Convert the given src event to a mpv_node, and set *dst to the result. *dst
* is set to a MPV_FORMAT_NODE_MAP, with fields for corresponding mpv_event and
* mpv_event.data/mpv_event_* fields.
*
* The exact details are not completely documented out of laziness. A start
* is located in the "Events" section of the manpage.
*
* *dst may point to newly allocated memory, or pointers in mpv_event. You must
* copy the entire mpv_node if you want to reference it after mpv_event becomes
* invalid (such as making a new mpv_wait_event() call, or destroying the
* mpv_handle from which it was returned). Call mpv_free_node_contents() to free
* any memory allocations made by this API function.
*
* Safe to be called from mpv render API threads.
*
* @param dst Target. This is not read and fully overwritten. Must be released
* with mpv_free_node_contents(). Do not write to pointers returned
* by it. (On error, this may be left as an empty node.)
* @param src The source event. Not modified (it's not const due to the author's
* prejudice of the C version of const).
* @return error code (MPV_ERROR_NOMEM only, if at all)
*/
MPV_EXPORT int mpv_event_to_node(mpv_node *dst, mpv_event *src);
/**
* Enable or disable the given event.
*
* Some events are enabled by default. Some events can't be disabled.
*
* (Informational note: currently, all events are enabled by default, except
* MPV_EVENT_TICK.)
*
* Safe to be called from mpv render API threads.
*
* @param event See enum mpv_event_id.
* @param enable 1 to enable receiving this event, 0 to disable it.
* @return error code
*/
MPV_EXPORT int mpv_request_event(mpv_handle *ctx, mpv_event_id event, int enable);
/**
* Enable or disable receiving of log messages. These are the messages the
* command line player prints to the terminal. This call sets the minimum
* required log level for a message to be received with MPV_EVENT_LOG_MESSAGE.
*
* @param min_level Minimal log level as string. Valid log levels:
* no fatal error warn info v debug trace
* The value "no" disables all messages. This is the default.
* An exception is the value "terminal-default", which uses the
* log level as set by the "--msg-level" option. This works
* even if the terminal is disabled. (Since API version 1.19.)
* Also see mpv_log_level.
* @return error code
*/
MPV_EXPORT int mpv_request_log_messages(mpv_handle *ctx, const char *min_level);
/**
* Wait for the next event, or until the timeout expires, or if another thread
* makes a call to mpv_wakeup(). Passing 0 as timeout will never wait, and
* is suitable for polling.
*
* The internal event queue has a limited size (per client handle). If you
* don't empty the event queue quickly enough with mpv_wait_event(), it will
* overflow and silently discard further events. If this happens, making
* asynchronous requests will fail as well (with MPV_ERROR_EVENT_QUEUE_FULL).
*
* Only one thread is allowed to call this on the same mpv_handle at a time.
* The API won't complain if more than one thread calls this, but it will cause
* race conditions in the client when accessing the shared mpv_event struct.
* Note that most other API functions are not restricted by this, and no API
* function internally calls mpv_wait_event(). Additionally, concurrent calls
* to different mpv_handles are always safe.
*
* As long as the timeout is 0, this is safe to be called from mpv render API
* threads.
*
* @param timeout Timeout in seconds, after which the function returns even if
* no event was received. A MPV_EVENT_NONE is returned on
* timeout. A value of 0 will disable waiting. Negative values
* will wait with an infinite timeout.
* @return A struct containing the event ID and other data. The pointer (and
* fields in the struct) stay valid until the next mpv_wait_event()
* call, or until the mpv_handle is destroyed. You must not write to
* the struct, and all memory referenced by it will be automatically
* released by the API on the next mpv_wait_event() call, or when the
* context is destroyed. The return value is never NULL.
*/
MPV_EXPORT mpv_event *mpv_wait_event(mpv_handle *ctx, double timeout);
/**
* Interrupt the current mpv_wait_event() call. This will wake up the thread
* currently waiting in mpv_wait_event(). If no thread is waiting, the next
* mpv_wait_event() call will return immediately (this is to avoid lost
* wakeups).
*
* mpv_wait_event() will receive a MPV_EVENT_NONE if it's woken up due to
* this call. But note that this dummy event might be skipped if there are
* already other events queued. All what counts is that the waiting thread
* is woken up at all.
*
* Safe to be called from mpv render API threads.
*/
MPV_EXPORT void mpv_wakeup(mpv_handle *ctx);
/**
* Set a custom function that should be called when there are new events. Use
* this if blocking in mpv_wait_event() to wait for new events is not feasible.
*
* Keep in mind that the callback will be called from foreign threads. You
* must not make any assumptions of the environment, and you must return as
* soon as possible (i.e. no long blocking waits). Exiting the callback through
* any other means than a normal return is forbidden (no throwing exceptions,
* no longjmp() calls). You must not change any local thread state (such as
* the C floating point environment).
*
* You are not allowed to call any client API functions inside of the callback.
* In particular, you should not do any processing in the callback, but wake up
* another thread that does all the work. The callback is meant strictly for
* notification only, and is called from arbitrary core parts of the player,
* that make no considerations for reentrant API use or allowing the callee to
* spend a lot of time doing other things. Keep in mind that it's also possible
* that the callback is called from a thread while a mpv API function is called
* (i.e. it can be reentrant).
*
* In general, the client API expects you to call mpv_wait_event() to receive
* notifications, and the wakeup callback is merely a helper utility to make
* this easier in certain situations. Note that it's possible that there's
* only one wakeup callback invocation for multiple events. You should call
* mpv_wait_event() with no timeout until MPV_EVENT_NONE is reached, at which
* point the event queue is empty.
*
* If you actually want to do processing in a callback, spawn a thread that
* does nothing but call mpv_wait_event() in a loop and dispatches the result
* to a callback.
*
* Only one wakeup callback can be set.
*
* @param cb function that should be called if a wakeup is required
* @param d arbitrary userdata passed to cb
*/
MPV_EXPORT void mpv_set_wakeup_callback(mpv_handle *ctx, void (*cb)(void *d), void *d);
/**
* Block until all asynchronous requests are done. This affects functions like
* mpv_command_async(), which return immediately and return their result as
* events.
*
* This is a helper, and somewhat equivalent to calling mpv_wait_event() in a
* loop until all known asynchronous requests have sent their reply as event,
* except that the event queue is not emptied.
*
* In case you called mpv_suspend() before, this will also forcibly reset the
* suspend counter of the given handle.
*/
MPV_EXPORT void mpv_wait_async_requests(mpv_handle *ctx);
/**
* A hook is like a synchronous event that blocks the player. You register
* a hook handler with this function. You will get an event, which you need
* to handle, and once things are ready, you can let the player continue with
* mpv_hook_continue().
*
* Currently, hooks can't be removed explicitly. But they will be implicitly
* removed if the mpv_handle it was registered with is destroyed. This also
* continues the hook if it was being handled by the destroyed mpv_handle (but
* this should be avoided, as it might mess up order of hook execution).
*
* Hook handlers are ordered globally by priority and order of registration.
* Handlers for the same hook with same priority are invoked in order of
* registration (the handler registered first is run first). Handlers with
* lower priority are run first (which seems backward).
*
* See the "Hooks" section in the manpage to see which hooks are currently
* defined.
*
* Some hooks might be reentrant (so you get multiple MPV_EVENT_HOOK for the
* same hook). If this can happen for a specific hook type, it will be
* explicitly documented in the manpage.
*
* Only the mpv_handle on which this was called will receive the hook events,
* or can "continue" them.
*
* @param reply_userdata This will be used for the mpv_event.reply_userdata
* field for the received MPV_EVENT_HOOK events.
* If you have no use for this, pass 0.
* @param name The hook name. This should be one of the documented names. But
* if the name is unknown, the hook event will simply be never
* raised.
* @param priority See remarks above. Use 0 as a neutral default.
* @return error code (usually fails only on OOM)
*/
MPV_EXPORT int mpv_hook_add(mpv_handle *ctx, uint64_t reply_userdata,
const char *name, int priority);
/**
* Respond to a MPV_EVENT_HOOK event. You must call this after you have handled
* the event. There is no way to "cancel" or "stop" the hook.
*
* Calling this will will typically unblock the player for whatever the hook
* is responsible for (e.g. for the "on_load" hook it lets it continue
* playback).
*
* It is explicitly undefined behavior to call this more than once for each
* MPV_EVENT_HOOK, to pass an incorrect ID, or to call this on a mpv_handle
* different from the one that registered the handler and received the event.
*
* @param id This must be the value of the mpv_event_hook.id field for the
* corresponding MPV_EVENT_HOOK.
* @return error code
*/
MPV_EXPORT int mpv_hook_continue(mpv_handle *ctx, uint64_t id);
#if MPV_ENABLE_DEPRECATED
/**
* Return a UNIX file descriptor referring to the read end of a pipe. This
* pipe can be used to wake up a poll() based processing loop. The purpose of
* this function is very similar to mpv_set_wakeup_callback(), and provides
* a primitive mechanism to handle coordinating a foreign event loop and the
* libmpv event loop. The pipe is non-blocking. It's closed when the mpv_handle
* is destroyed. This function always returns the same value (on success).
*
* This is in fact implemented using the same underlying code as for
* mpv_set_wakeup_callback() (though they don't conflict), and it is as if each
* callback invocation writes a single 0 byte to the pipe. When the pipe
* becomes readable, the code calling poll() (or select()) on the pipe should
* read all contents of the pipe and then call mpv_wait_event(c, 0) until
* no new events are returned. The pipe contents do not matter and can just
* be discarded. There is not necessarily one byte per readable event in the
* pipe. For example, the pipes are non-blocking, and mpv won't block if the
* pipe is full. Pipes are normally limited to 4096 bytes, so if there are
* more than 4096 events, the number of readable bytes can not equal the number
* of events queued. Also, it's possible that mpv does not write to the pipe
* once it's guaranteed that the client was already signaled. See the example
* below how to do it correctly.
*
* Example:
*
* int pipefd = mpv_get_wakeup_pipe(mpv);
* if (pipefd < 0)
* error();
* while (1) {
* struct pollfd pfds[1] = {
* { .fd = pipefd, .events = POLLIN },
* };
* // Wait until there are possibly new mpv events.
* poll(pfds, 1, -1);
* if (pfds[0].revents & POLLIN) {
* // Empty the pipe. Doing this before calling mpv_wait_event()
* // ensures that no wakeups are missed. It's not so important to
* // make sure the pipe is really empty (it will just cause some
* // additional wakeups in unlikely corner cases).
* char unused[256];
* read(pipefd, unused, sizeof(unused));
* while (1) {
* mpv_event *ev = mpv_wait_event(mpv, 0);
* // If MPV_EVENT_NONE is received, the event queue is empty.
* if (ev->event_id == MPV_EVENT_NONE)
* break;
* // Process the event.
* ...
* }
* }
* }
*
* @deprecated this function will be removed in the future. If you need this
* functionality, use mpv_set_wakeup_callback(), create a pipe
* manually, and call write() on your pipe in the callback.
*
* @return A UNIX FD of the read end of the wakeup pipe, or -1 on error.
* On MS Windows/MinGW, this will always return -1.
*/
MPV_EXPORT int mpv_get_wakeup_pipe(mpv_handle *ctx);
#endif
#ifdef __cplusplus
}
#endif
#endif
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