diff options
Diffstat (limited to 'libmpv')
| -rw-r--r-- | libmpv/client.h | 2032 | ||||
| -rw-r--r-- | libmpv/render.h | 759 | ||||
| -rw-r--r-- | libmpv/render_gl.h | 211 | ||||
| -rw-r--r-- | libmpv/stream_cb.h | 247 |
4 files changed, 3249 insertions, 0 deletions
diff --git a/libmpv/client.h b/libmpv/client.h new file mode 100644 index 0000000..0a548a5 --- /dev/null +++ b/libmpv/client.h @@ -0,0 +1,2032 @@ +/* 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 + * -Dgpl=false, which makes it LGPLv2+. + */ + +#ifndef MPV_CLIENT_API_H_ +#define MPV_CLIENT_API_H_ + +#include <stddef.h> +#include <stdint.h> + +#ifdef _WIN32 +#define MPV_EXPORT __declspec(dllexport) +#define MPV_SELECTANY __declspec(selectany) +#elif defined(__GNUC__) || defined(__clang__) +#define MPV_EXPORT __attribute__((visibility("default"))) +#define MPV_SELECTANY +#else +#define MPV_EXPORT +#define MPV_SELECTANY +#endif + +#ifdef __cpp_decltype +#define MPV_DECLTYPE decltype +#else +#define MPV_DECLTYPE __typeof__ +#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, 2) + +/** + * 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 nanoseconds. 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_ns(mpv_handle *ctx); + +/** + * Same as mpv_get_time_ns but in microseconds. + */ +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 + +/** + * Defining MPV_CPLUGIN_DYNAMIC_SYM during plugin compilation will replace mpv_* + * functions with function pointers. Those pointer will be initialized when + * loading the plugin. + * + * It is recommended to use this symbol table when targeting Windows. The loader + * does not have notion of global symbols. Loading cplugin into mpv process will + * not allow this plugin to call any of the symbols that may be available in + * other modules. Instead cplugin has to link explicitly to specific PE binary, + * libmpv-2.dll/mpv.exe or any other binary that may have linked mpv statically. + * This limits portability of cplugin as it would need to be compiled separately + * for each of target PE binary that includes mpv's symbols. Which in practice + * is unrealistic, as we want one cplugin to be loaded without those restrictions. + * + * Instead of linking to any PE binary, we create function pointers for all mpv's + * exported symbols. For convenience names of entrypoints are redefined to those + * pointer, so no changes are required in cplugin source code, except of defining + * MPV_CPLUGIN_DYNAMIC_SYM. Those function pointer are exported to make them + * available for mpv to init with correct values during runtime, before calling + * `mpv_open_cplugin`. + * + * Note that those pointers are decorated with `selectany` attribute, so no need + * to worry about multiple definitions, linker will keep only single instance. + */ +#ifdef MPV_CPLUGIN_DYNAMIC_SYM + +#define MPV_DEFINE_SYM_PTR(name) \ + MPV_SELECTANY MPV_EXPORT \ + MPV_DECLTYPE(name) *pfn_##name; + +MPV_DEFINE_SYM_PTR(mpv_client_api_version) +#define mpv_client_api_version pfn_mpv_client_api_version +MPV_DEFINE_SYM_PTR(mpv_error_string) +#define mpv_error_string pfn_mpv_error_string +MPV_DEFINE_SYM_PTR(mpv_free) +#define mpv_free pfn_mpv_free +MPV_DEFINE_SYM_PTR(mpv_client_name) +#define mpv_client_name pfn_mpv_client_name +MPV_DEFINE_SYM_PTR(mpv_client_id) +#define mpv_client_id pfn_mpv_client_id +MPV_DEFINE_SYM_PTR(mpv_create) +#define mpv_create pfn_mpv_create +MPV_DEFINE_SYM_PTR(mpv_initialize) +#define mpv_initialize pfn_mpv_initialize +MPV_DEFINE_SYM_PTR(mpv_destroy) +#define mpv_destroy pfn_mpv_destroy +MPV_DEFINE_SYM_PTR(mpv_terminate_destroy) +#define mpv_terminate_destroy pfn_mpv_terminate_destroy +MPV_DEFINE_SYM_PTR(mpv_create_client) +#define mpv_create_client pfn_mpv_create_client +MPV_DEFINE_SYM_PTR(mpv_create_weak_client) +#define mpv_create_weak_client pfn_mpv_create_weak_client +MPV_DEFINE_SYM_PTR(mpv_load_config_file) +#define mpv_load_config_file pfn_mpv_load_config_file +MPV_DEFINE_SYM_PTR(mpv_get_time_ns) +#define mpv_get_time_ns pfn_mpv_get_time_ns +MPV_DEFINE_SYM_PTR(mpv_get_time_us) +#define mpv_get_time_us pfn_mpv_get_time_us +MPV_DEFINE_SYM_PTR(mpv_free_node_contents) +#define mpv_free_node_contents pfn_mpv_free_node_contents +MPV_DEFINE_SYM_PTR(mpv_set_option) +#define mpv_set_option pfn_mpv_set_option +MPV_DEFINE_SYM_PTR(mpv_set_option_string) +#define mpv_set_option_string pfn_mpv_set_option_string +MPV_DEFINE_SYM_PTR(mpv_command) +#define mpv_command pfn_mpv_command +MPV_DEFINE_SYM_PTR(mpv_command_node) +#define mpv_command_node pfn_mpv_command_node +MPV_DEFINE_SYM_PTR(mpv_command_ret) +#define mpv_command_ret pfn_mpv_command_ret +MPV_DEFINE_SYM_PTR(mpv_command_string) +#define mpv_command_string pfn_mpv_command_string +MPV_DEFINE_SYM_PTR(mpv_command_async) +#define mpv_command_async pfn_mpv_command_async +MPV_DEFINE_SYM_PTR(mpv_command_node_async) +#define mpv_command_node_async pfn_mpv_command_node_async +MPV_DEFINE_SYM_PTR(mpv_abort_async_command) +#define mpv_abort_async_command pfn_mpv_abort_async_command +MPV_DEFINE_SYM_PTR(mpv_set_property) +#define mpv_set_property pfn_mpv_set_property +MPV_DEFINE_SYM_PTR(mpv_set_property_string) +#define mpv_set_property_string pfn_mpv_set_property_string +MPV_DEFINE_SYM_PTR(mpv_del_property) +#define mpv_del_property pfn_mpv_del_property +MPV_DEFINE_SYM_PTR(mpv_set_property_async) +#define mpv_set_property_async pfn_mpv_set_property_async +MPV_DEFINE_SYM_PTR(mpv_get_property) +#define mpv_get_property pfn_mpv_get_property +MPV_DEFINE_SYM_PTR(mpv_get_property_string) +#define mpv_get_property_string pfn_mpv_get_property_string +MPV_DEFINE_SYM_PTR(mpv_get_property_osd_string) +#define mpv_get_property_osd_string pfn_mpv_get_property_osd_string +MPV_DEFINE_SYM_PTR(mpv_get_property_async) +#define mpv_get_property_async pfn_mpv_get_property_async +MPV_DEFINE_SYM_PTR(mpv_observe_property) +#define mpv_observe_property pfn_mpv_observe_property +MPV_DEFINE_SYM_PTR(mpv_unobserve_property) +#define mpv_unobserve_property pfn_mpv_unobserve_property +MPV_DEFINE_SYM_PTR(mpv_event_name) +#define mpv_event_name pfn_mpv_event_name +MPV_DEFINE_SYM_PTR(mpv_event_to_node) +#define mpv_event_to_node pfn_mpv_event_to_node +MPV_DEFINE_SYM_PTR(mpv_request_event) +#define mpv_request_event pfn_mpv_request_event +MPV_DEFINE_SYM_PTR(mpv_request_log_messages) +#define mpv_request_log_messages pfn_mpv_request_log_messages +MPV_DEFINE_SYM_PTR(mpv_wait_event) +#define mpv_wait_event pfn_mpv_wait_event +MPV_DEFINE_SYM_PTR(mpv_wakeup) +#define mpv_wakeup pfn_mpv_wakeup +MPV_DEFINE_SYM_PTR(mpv_set_wakeup_callback) +#define mpv_set_wakeup_callback pfn_mpv_set_wakeup_callback +MPV_DEFINE_SYM_PTR(mpv_wait_async_requests) +#define mpv_wait_async_requests pfn_mpv_wait_async_requests +MPV_DEFINE_SYM_PTR(mpv_hook_add) +#define mpv_hook_add pfn_mpv_hook_add +MPV_DEFINE_SYM_PTR(mpv_hook_continue) +#define mpv_hook_continue pfn_mpv_hook_continue +MPV_DEFINE_SYM_PTR(mpv_get_wakeup_pipe) +#define mpv_get_wakeup_pipe pfn_mpv_get_wakeup_pipe + +#endif + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/libmpv/render.h b/libmpv/render.h new file mode 100644 index 0000000..862ffde --- /dev/null +++ b/libmpv/render.h @@ -0,0 +1,759 @@ +/* Copyright (C) 2018 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. + */ + +#ifndef MPV_CLIENT_API_RENDER_H_ +#define MPV_CLIENT_API_RENDER_H_ + +#include "client.h" + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * Overview + * -------- + * + * This API can be used to make mpv render using supported graphic APIs (such + * as OpenGL). It can be used to handle video display. + * + * The renderer needs to be created with mpv_render_context_create() before + * you start playback (or otherwise cause a VO to be created). Then (with most + * backends) mpv_render_context_render() can be used to explicitly render the + * current video frame. Use mpv_render_context_set_update_callback() to get + * notified when there is a new frame to draw. + * + * Preferably rendering should be done in a separate thread. If you call + * normal libmpv API functions on the renderer thread, deadlocks can result + * (these are made non-fatal with timeouts, but user experience will obviously + * suffer). See "Threading" section below. + * + * You can output and embed video without this API by setting the mpv "wid" + * option to a native window handle (see "Embedding the video window" section + * in the client.h header). In general, using the render API is recommended, + * because window embedding can cause various issues, especially with GUI + * toolkits and certain platforms. + * + * Supported backends + * ------------------ + * + * OpenGL: via MPV_RENDER_API_TYPE_OPENGL, see render_gl.h header. + * Software: via MPV_RENDER_API_TYPE_SW, see section "Software renderer" + * + * Threading + * --------- + * + * You are recommended to do rendering on a separate thread than normal libmpv + * use. + * + * The mpv_render_* functions can be called from any thread, under the + * following conditions: + * - only one of the mpv_render_* functions can be called at the same time + * (unless they belong to different mpv cores created by mpv_create()) + * - never can be called from within the callbacks set with + * mpv_set_wakeup_callback() or mpv_render_context_set_update_callback() + * - if the OpenGL backend is used, for all functions the OpenGL context + * must be "current" in the calling thread, and it must be the same OpenGL + * context as the mpv_render_context was created with. Otherwise, undefined + * behavior will occur. + * - the thread does not call libmpv API functions other than the mpv_render_* + * functions, except APIs which are declared as safe (see below). Likewise, + * there must be no lock or wait dependency from the render thread to a + * thread using other libmpv functions. Basically, the situation that your + * render thread waits for a "not safe" libmpv API function to return must + * not happen. If you ignore this requirement, deadlocks can happen, which + * are made non-fatal with timeouts; then playback quality will be degraded, + * and the message + * mpv_render_context_render() not being called or stuck. + * is logged. If you set MPV_RENDER_PARAM_ADVANCED_CONTROL, you promise that + * this won't happen, and must absolutely guarantee it, or a real deadlock + * will freeze the mpv core thread forever. + * + * libmpv functions which are safe to call from a render thread are: + * - functions marked with "Safe to be called from mpv render API threads." + * - client.h functions which don't have an explicit or implicit mpv_handle + * parameter + * - mpv_render_* functions; but only for the same mpv_render_context pointer. + * If the pointer is different, mpv_render_context_free() is not safe. (The + * reason is that if MPV_RENDER_PARAM_ADVANCED_CONTROL is set, it may have + * to process still queued requests from the core, which it can do only for + * the current context, while requests for other contexts would deadlock. + * Also, it may have to wait and block for the core to terminate the video + * chain to make sure no resources are used after context destruction.) + * - if the mpv_handle parameter refers to a different mpv core than the one + * you're rendering for (very obscure, but allowed) + * + * Note about old libmpv version: + * + * Before API version 1.105 (basically in mpv 0.29.x), simply enabling + * MPV_RENDER_PARAM_ADVANCED_CONTROL could cause deadlock issues. This can + * be worked around by setting the "vd-lavc-dr" option to "no". + * In addition, you were required to call all mpv_render*() API functions + * from the same thread on which mpv_render_context_create() was originally + * run (for the same the mpv_render_context). Not honoring it led to UB + * (deadlocks, use of invalid mp_thread handles), even if you moved your GL + * context to a different thread correctly. + * These problems were addressed in API version 1.105 (mpv 0.30.0). + * + * Context and handle lifecycle + * ---------------------------- + * + * Video initialization will fail if the render context was not initialized yet + * (with mpv_render_context_create()), or it will revert to a VO that creates + * its own window. + * + * Currently, there can be only 1 mpv_render_context at a time per mpv core. + * + * Calling mpv_render_context_free() while a VO is using the render context is + * active will disable video. + * + * You must free the context with mpv_render_context_free() before the mpv core + * is destroyed. If this doesn't happen, undefined behavior will result. + * + * Software renderer + * ----------------- + * + * MPV_RENDER_API_TYPE_SW provides an extremely simple (but slow) renderer to + * memory surfaces. You probably don't want to use this. Use other render API + * types, or other methods of video embedding. + * + * Use mpv_render_context_create() with MPV_RENDER_PARAM_API_TYPE set to + * MPV_RENDER_API_TYPE_SW. + * + * Call mpv_render_context_render() with various MPV_RENDER_PARAM_SW_* fields + * to render the video frame to an in-memory surface. The following fields are + * required: MPV_RENDER_PARAM_SW_SIZE, MPV_RENDER_PARAM_SW_FORMAT, + * MPV_RENDER_PARAM_SW_STRIDE, MPV_RENDER_PARAM_SW_POINTER. + * + * This method of rendering is very slow, because everything, including color + * conversion, scaling, and OSD rendering, is done on the CPU, single-threaded. + * In particular, large video or display sizes, as well as presence of OSD or + * subtitles can make it too slow for realtime. As with other software rendering + * VOs, setting "sw-fast" may help. Enabling or disabling zimg may help, + * depending on the platform. + * + * In addition, certain multimedia job creation measures like HDR may not work + * properly, and will have to be manually handled by for example inserting + * filters. + * + * This API is not really suitable to extract individual frames from video etc. + * (basically non-playback uses) - there are better libraries for this. It can + * be used this way, but it may be clunky and tricky. + * + * Further notes: + * - MPV_RENDER_PARAM_FLIP_Y is currently ignored (unsupported) + * - MPV_RENDER_PARAM_DEPTH is ignored (meaningless) + */ + +/** + * Opaque context, returned by mpv_render_context_create(). + */ +typedef struct mpv_render_context mpv_render_context; + +/** + * Parameters for mpv_render_param (which is used in a few places such as + * mpv_render_context_create(). + * + * Also see mpv_render_param for conventions and how to use it. + */ +typedef enum mpv_render_param_type { + /** + * Not a valid value, but also used to terminate a params array. Its value + * is always guaranteed to be 0 (even if the ABI changes in the future). + */ + MPV_RENDER_PARAM_INVALID = 0, + /** + * The render API to use. Valid for mpv_render_context_create(). + * + * Type: char* + * + * Defined APIs: + * + * MPV_RENDER_API_TYPE_OPENGL: + * OpenGL desktop 2.1 or later (preferably core profile compatible to + * OpenGL 3.2), or OpenGLES 2.0 or later. + * Providing MPV_RENDER_PARAM_OPENGL_INIT_PARAMS is required. + * It is expected that an OpenGL context is valid and "current" when + * calling mpv_render_* functions (unless specified otherwise). It + * must be the same context for the same mpv_render_context. + */ + MPV_RENDER_PARAM_API_TYPE = 1, + /** + * Required parameters for initializing the OpenGL renderer. Valid for + * mpv_render_context_create(). + * Type: mpv_opengl_init_params* + */ + MPV_RENDER_PARAM_OPENGL_INIT_PARAMS = 2, + /** + * Describes a GL render target. Valid for mpv_render_context_render(). + * Type: mpv_opengl_fbo* + */ + MPV_RENDER_PARAM_OPENGL_FBO = 3, + /** + * Control flipped rendering. Valid for mpv_render_context_render(). + * Type: int* + * If the value is set to 0, render normally. Otherwise, render it flipped, + * which is needed e.g. when rendering to an OpenGL default framebuffer + * (which has a flipped coordinate system). + */ + MPV_RENDER_PARAM_FLIP_Y = 4, + /** + * Control surface depth. Valid for mpv_render_context_render(). + * Type: int* + * This implies the depth of the surface passed to the render function in + * bits per channel. If omitted or set to 0, the renderer will assume 8. + * Typically used to control dithering. + */ + MPV_RENDER_PARAM_DEPTH = 5, + /** + * ICC profile blob. Valid for mpv_render_context_set_parameter(). + * Type: mpv_byte_array* + * Set an ICC profile for use with the "icc-profile-auto" option. (If the + * option is not enabled, the ICC data will not be used.) + */ + MPV_RENDER_PARAM_ICC_PROFILE = 6, + /** + * Ambient light in lux. Valid for mpv_render_context_set_parameter(). + * Type: int* + * This can be used for automatic gamma correction. + */ + MPV_RENDER_PARAM_AMBIENT_LIGHT = 7, + /** + * X11 Display, sometimes used for hwdec. Valid for + * mpv_render_context_create(). The Display must stay valid for the lifetime + * of the mpv_render_context. + * Type: Display* + */ + MPV_RENDER_PARAM_X11_DISPLAY = 8, + /** + * Wayland display, sometimes used for hwdec. Valid for + * mpv_render_context_create(). The wl_display must stay valid for the + * lifetime of the mpv_render_context. + * Type: struct wl_display* + */ + MPV_RENDER_PARAM_WL_DISPLAY = 9, + /** + * Better control about rendering and enabling some advanced features. Valid + * for mpv_render_context_create(). + * + * This conflates multiple requirements the API user promises to abide if + * this option is enabled: + * + * - The API user's render thread, which is calling the mpv_render_*() + * functions, never waits for the core. Otherwise deadlocks can happen. + * See "Threading" section. + * - The callback set with mpv_render_context_set_update_callback() can now + * be called even if there is no new frame. The API user should call the + * mpv_render_context_update() function, and interpret the return value + * for whether a new frame should be rendered. + * - Correct functionality is impossible if the update callback is not set, + * or not set soon enough after mpv_render_context_create() (the core can + * block while waiting for you to call mpv_render_context_update(), and + * if the update callback is not correctly set, it will deadlock, or + * block for too long). + * + * In general, setting this option will enable the following features (and + * possibly more): + * + * - "Direct rendering", which means the player decodes directly to a + * texture, which saves a copy per video frame ("vd-lavc-dr" option + * needs to be enabled, and the rendering backend as well as the + * underlying GPU API/driver needs to have support for it). + * - Rendering screenshots with the GPU API if supported by the backend + * (instead of using a suboptimal software fallback via libswscale). + * + * Warning: do not just add this without reading the "Threading" section + * above, and then wondering that deadlocks happen. The + * requirements are tricky. But also note that even if advanced + * control is disabled, not adhering to the rules will lead to + * playback problems. Enabling advanced controls simply makes + * violating these rules fatal. + * + * Type: int*: 0 for disable (default), 1 for enable + */ + MPV_RENDER_PARAM_ADVANCED_CONTROL = 10, + /** + * Return information about the next frame to render. Valid for + * mpv_render_context_get_info(). + * + * Type: mpv_render_frame_info* + * + * It strictly returns information about the _next_ frame. The implication + * is that e.g. mpv_render_context_update()'s return value will have + * MPV_RENDER_UPDATE_FRAME set, and the user is supposed to call + * mpv_render_context_render(). If there is no next frame, then the + * return value will have is_valid set to 0. + */ + MPV_RENDER_PARAM_NEXT_FRAME_INFO = 11, + /** + * Enable or disable video timing. Valid for mpv_render_context_render(). + * + * Type: int*: 0 for disable, 1 for enable (default) + * + * When video is timed to audio, the player attempts to render video a bit + * ahead, and then do a blocking wait until the target display time is + * reached. This blocks mpv_render_context_render() for up to the amount + * specified with the "video-timing-offset" global option. You can set + * this parameter to 0 to disable this kind of waiting. If you do, it's + * recommended to use the target time value in mpv_render_frame_info to + * wait yourself, or to set the "video-timing-offset" to 0 instead. + * + * Disabling this without doing anything in addition will result in A/V sync + * being slightly off. + */ + MPV_RENDER_PARAM_BLOCK_FOR_TARGET_TIME = 12, + /** + * Use to skip rendering in mpv_render_context_render(). + * + * Type: int*: 0 for rendering (default), 1 for skipping + * + * If this is set, you don't need to pass a target surface to the render + * function (and if you do, it's completely ignored). This can still call + * into the lower level APIs (i.e. if you use OpenGL, the OpenGL context + * must be set). + * + * Be aware that the render API will consider this frame as having been + * rendered. All other normal rules also apply, for example about whether + * you have to call mpv_render_context_report_swap(). It also does timing + * in the same way. + */ + MPV_RENDER_PARAM_SKIP_RENDERING = 13, + /** + * Deprecated. Not supported. Use MPV_RENDER_PARAM_DRM_DISPLAY_V2 instead. + * Type : struct mpv_opengl_drm_params* + */ + MPV_RENDER_PARAM_DRM_DISPLAY = 14, + /** + * DRM draw surface size, contains draw surface dimensions. + * Valid for mpv_render_context_create(). + * Type : struct mpv_opengl_drm_draw_surface_size* + */ + MPV_RENDER_PARAM_DRM_DRAW_SURFACE_SIZE = 15, + /** + * DRM display, contains drm display handles. + * Valid for mpv_render_context_create(). + * Type : struct mpv_opengl_drm_params_v2* + */ + MPV_RENDER_PARAM_DRM_DISPLAY_V2 = 16, + /** + * MPV_RENDER_API_TYPE_SW only: rendering target surface size, mandatory. + * Valid for MPV_RENDER_API_TYPE_SW & mpv_render_context_render(). + * Type: int[2] (e.g.: int s[2] = {w, h}; param.data = &s[0];) + * + * The video frame is transformed as with other VOs. Typically, this means + * the video gets scaled and black bars are added if the video size or + * aspect ratio mismatches with the target size. + */ + MPV_RENDER_PARAM_SW_SIZE = 17, + /** + * MPV_RENDER_API_TYPE_SW only: rendering target surface pixel format, + * mandatory. + * Valid for MPV_RENDER_API_TYPE_SW & mpv_render_context_render(). + * Type: char* (e.g.: char *f = "rgb0"; param.data = f;) + * + * Valid values are: + * "rgb0", "bgr0", "0bgr", "0rgb" + * 4 bytes per pixel RGB, 1 byte (8 bit) per component, component bytes + * with increasing address from left to right (e.g. "rgb0" has r at + * address 0), the "0" component contains uninitialized garbage (often + * the value 0, but not necessarily; the bad naming is inherited from + * FFmpeg) + * Pixel alignment size: 4 bytes + * "rgb24" + * 3 bytes per pixel RGB. This is strongly discouraged because it is + * very slow. + * Pixel alignment size: 1 bytes + * other + * The API may accept other pixel formats, using mpv internal format + * names, as long as it's internally marked as RGB, has exactly 1 + * plane, and is supported as conversion output. It is not a good idea + * to rely on any of these. Their semantics and handling could change. + */ + MPV_RENDER_PARAM_SW_FORMAT = 18, + /** + * MPV_RENDER_API_TYPE_SW only: rendering target surface bytes per line, + * mandatory. + * Valid for MPV_RENDER_API_TYPE_SW & mpv_render_context_render(). + * Type: size_t* + * + * This is the number of bytes between a pixel (x, y) and (x, y + 1) on the + * target surface. It must be a multiple of the pixel size, and have space + * for the surface width as specified by MPV_RENDER_PARAM_SW_SIZE. + * + * Both stride and pointer value should be a multiple of 64 to facilitate + * fast SIMD operation. Lower alignment might trigger slower code paths, + * and in the worst case, will copy the entire target frame. If mpv is built + * with zimg (and zimg is not disabled), the performance impact might be + * less. + * In either cases, the pointer and stride must be aligned at least to the + * pixel alignment size. Otherwise, crashes and undefined behavior is + * possible on platforms which do not support unaligned accesses (either + * through normal memory access or aligned SIMD memory access instructions). + */ + MPV_RENDER_PARAM_SW_STRIDE = 19, + /* + * MPV_RENDER_API_TYPE_SW only: rendering target surface pixel data pointer, + * mandatory. + * Valid for MPV_RENDER_API_TYPE_SW & mpv_render_context_render(). + * Type: void* + * + * This points to the first pixel at the left/top corner (0, 0). In + * particular, each line y starts at (pointer + stride * y). Upon rendering, + * all data between pointer and (pointer + stride * h) is overwritten. + * Whether the padding between (w, y) and (0, y + 1) is overwritten is left + * unspecified (it should not be, but unfortunately some scaler backends + * will do it anyway). It is assumed that even the padding after the last + * line (starting at bytepos(w, h) until (pointer + stride * h)) is + * writable. + * + * See MPV_RENDER_PARAM_SW_STRIDE for alignment requirements. + */ + MPV_RENDER_PARAM_SW_POINTER = 20, +} mpv_render_param_type; + +/** + * For backwards compatibility with the old naming of + * MPV_RENDER_PARAM_DRM_DRAW_SURFACE_SIZE + */ +#define MPV_RENDER_PARAM_DRM_OSD_SIZE MPV_RENDER_PARAM_DRM_DRAW_SURFACE_SIZE + +/** + * Used to pass arbitrary parameters to some mpv_render_* functions. The + * meaning of the data parameter is determined by the type, and each + * MPV_RENDER_PARAM_* documents what type the value must point to. + * + * Each value documents the required data type as the pointer you cast to + * void* and set on mpv_render_param.data. For example, if MPV_RENDER_PARAM_FOO + * documents the type as Something* , then the code should look like this: + * + * Something foo = {...}; + * mpv_render_param param; + * param.type = MPV_RENDER_PARAM_FOO; + * param.data = & foo; + * + * Normally, the data field points to exactly 1 object. If the type is char*, + * it points to a 0-terminated string. + * + * In all cases (unless documented otherwise) the pointers need to remain + * valid during the call only. Unless otherwise documented, the API functions + * will not write to the params array or any data pointed to it. + * + * As a convention, parameter arrays are always terminated by type==0. There + * is no specific order of the parameters required. The order of the 2 fields in + * this struct is guaranteed (even after ABI changes). + */ +typedef struct mpv_render_param { + enum mpv_render_param_type type; + void *data; +} mpv_render_param; + + +/** + * Predefined values for MPV_RENDER_PARAM_API_TYPE. + */ +// See render_gl.h +#define MPV_RENDER_API_TYPE_OPENGL "opengl" +// See section "Software renderer" +#define MPV_RENDER_API_TYPE_SW "sw" + +/** + * Flags used in mpv_render_frame_info.flags. Each value represents a bit in it. + */ +typedef enum mpv_render_frame_info_flag { + /** + * Set if there is actually a next frame. If unset, there is no next frame + * yet, and other flags and fields that require a frame to be queued will + * be unset. + * + * This is set for _any_ kind of frame, even for redraw requests. + * + * Note that when this is unset, it simply means no new frame was + * decoded/queued yet, not necessarily that the end of the video was + * reached. A new frame can be queued after some time. + * + * If the return value of mpv_render_context_render() had the + * MPV_RENDER_UPDATE_FRAME flag set, this flag will usually be set as well, + * unless the frame is rendered, or discarded by other asynchronous events. + */ + MPV_RENDER_FRAME_INFO_PRESENT = 1 << 0, + /** + * If set, the frame is not an actual new video frame, but a redraw request. + * For example if the video is paused, and an option that affects video + * rendering was changed (or any other reason), an update request can be + * issued and this flag will be set. + * + * Typically, redraw frames will not be subject to video timing. + * + * Implies MPV_RENDER_FRAME_INFO_PRESENT. + */ + MPV_RENDER_FRAME_INFO_REDRAW = 1 << 1, + /** + * If set, this is supposed to reproduce the previous frame perfectly. This + * is usually used for certain "video-sync" options ("display-..." modes). + * Typically the renderer will blit the video from a FBO. Unset otherwise. + * + * Implies MPV_RENDER_FRAME_INFO_PRESENT. + */ + MPV_RENDER_FRAME_INFO_REPEAT = 1 << 2, + /** + * If set, the player timing code expects that the user thread blocks on + * vsync (by either delaying the render call, or by making a call to + * mpv_render_context_report_swap() at vsync time). + * + * Implies MPV_RENDER_FRAME_INFO_PRESENT. + */ + MPV_RENDER_FRAME_INFO_BLOCK_VSYNC = 1 << 3, +} mpv_render_frame_info_flag; + +/** + * Information about the next video frame that will be rendered. Can be + * retrieved with MPV_RENDER_PARAM_NEXT_FRAME_INFO. + */ +typedef struct mpv_render_frame_info { + /** + * A bitset of mpv_render_frame_info_flag values (i.e. multiple flags are + * combined with bitwise or). + */ + uint64_t flags; + /** + * Absolute time at which the frame is supposed to be displayed. This is in + * the same unit and base as the time returned by mpv_get_time_us(). For + * frames that are redrawn, or if vsync locked video timing is used (see + * "video-sync" option), then this can be 0. The "video-timing-offset" + * option determines how much "headroom" the render thread gets (but a high + * enough frame rate can reduce it anyway). mpv_render_context_render() will + * normally block until the time is elapsed, unless you pass it + * MPV_RENDER_PARAM_BLOCK_FOR_TARGET_TIME = 0. + */ + int64_t target_time; +} mpv_render_frame_info; + +/** + * Initialize the renderer state. Depending on the backend used, this will + * access the underlying GPU API and initialize its own objects. + * + * You must free the context with mpv_render_context_free(). Not doing so before + * the mpv core is destroyed may result in memory leaks or crashes. + * + * Currently, only at most 1 context can exists per mpv core (it represents the + * main video output). + * + * You should pass the following parameters: + * - MPV_RENDER_PARAM_API_TYPE to select the underlying backend/GPU API. + * - Backend-specific init parameter, like MPV_RENDER_PARAM_OPENGL_INIT_PARAMS. + * - Setting MPV_RENDER_PARAM_ADVANCED_CONTROL and following its rules is + * strongly recommended. + * - If you want to use hwdec, possibly hwdec interop resources. + * + * @param res set to the context (on success) or NULL (on failure). The value + * is never read and always overwritten. + * @param mpv handle used to get the core (the mpv_render_context won't depend + * on this specific handle, only the core referenced by it) + * @param params an array of parameters, terminated by type==0. It's left + * unspecified what happens with unknown parameters. At least + * MPV_RENDER_PARAM_API_TYPE is required, and most backends will + * require another backend-specific parameter. + * @return error code, including but not limited to: + * MPV_ERROR_UNSUPPORTED: the OpenGL version is not supported + * (or required extensions are missing) + * MPV_ERROR_NOT_IMPLEMENTED: an unknown API type was provided, or + * support for the requested API was not + * built in the used libmpv binary. + * MPV_ERROR_INVALID_PARAMETER: at least one of the provided parameters was + * not valid. + */ +MPV_EXPORT int mpv_render_context_create(mpv_render_context **res, mpv_handle *mpv, + mpv_render_param *params); + +/** + * Attempt to change a single parameter. Not all backends and parameter types + * support all kinds of changes. + * + * @param ctx a valid render context + * @param param the parameter type and data that should be set + * @return error code. If a parameter could actually be changed, this returns + * success, otherwise an error code depending on the parameter type + * and situation. + */ +MPV_EXPORT int mpv_render_context_set_parameter(mpv_render_context *ctx, + mpv_render_param param); + +/** + * Retrieve information from the render context. This is NOT a counterpart to + * mpv_render_context_set_parameter(), because you generally can't read + * parameters set with it, and this function is not meant for this purpose. + * Instead, this is for communicating information from the renderer back to the + * user. See mpv_render_param_type; entries which support this function + * explicitly mention it, and for other entries you can assume it will fail. + * + * You pass param with param.type set and param.data pointing to a variable + * of the required data type. The function will then overwrite that variable + * with the returned value (at least on success). + * + * @param ctx a valid render context + * @param param the parameter type and data that should be retrieved + * @return error code. If a parameter could actually be retrieved, this returns + * success, otherwise an error code depending on the parameter type + * and situation. MPV_ERROR_NOT_IMPLEMENTED is used for unknown + * param.type, or if retrieving it is not supported. + */ +MPV_EXPORT int mpv_render_context_get_info(mpv_render_context *ctx, + mpv_render_param param); + +typedef void (*mpv_render_update_fn)(void *cb_ctx); + +/** + * Set the callback that notifies you when a new video frame is available, or + * if the video display configuration somehow changed and requires a redraw. + * Similar to mpv_set_wakeup_callback(), you must not call any mpv API from + * the callback, and all the other listed restrictions apply (such as not + * exiting the callback by throwing exceptions). + * + * This can be called from any thread, except from an update callback. In case + * of the OpenGL backend, no OpenGL state or API is accessed. + * + * Calling this will raise an update callback immediately. + * + * @param callback callback(callback_ctx) is called if the frame should be + * redrawn + * @param callback_ctx opaque argument to the callback + */ +MPV_EXPORT void mpv_render_context_set_update_callback(mpv_render_context *ctx, + mpv_render_update_fn callback, + void *callback_ctx); + +/** + * The API user is supposed to call this when the update callback was invoked + * (like all mpv_render_* functions, this has to happen on the render thread, + * and _not_ from the update callback itself). + * + * This is optional if MPV_RENDER_PARAM_ADVANCED_CONTROL was not set (default). + * Otherwise, it's a hard requirement that this is called after each update + * callback. If multiple update callback happened, and the function could not + * be called sooner, it's OK to call it once after the last callback. + * + * If an update callback happens during or after this function, the function + * must be called again at the soonest possible time. + * + * If MPV_RENDER_PARAM_ADVANCED_CONTROL was set, this will do additional work + * such as allocating textures for the video decoder. + * + * @return a bitset of mpv_render_update_flag values (i.e. multiple flags are + * combined with bitwise or). Typically, this will tell the API user + * what should happen next. E.g. if the MPV_RENDER_UPDATE_FRAME flag is + * set, mpv_render_context_render() should be called. If flags unknown + * to the API user are set, or if the return value is 0, nothing needs + * to be done. + */ +MPV_EXPORT uint64_t mpv_render_context_update(mpv_render_context *ctx); + +/** + * Flags returned by mpv_render_context_update(). Each value represents a bit + * in the function's return value. + */ +typedef enum mpv_render_update_flag { + /** + * A new video frame must be rendered. mpv_render_context_render() must be + * called. + */ + MPV_RENDER_UPDATE_FRAME = 1 << 0, +} mpv_render_context_flag; + +/** + * Render video. + * + * Typically renders the video to a target surface provided via mpv_render_param + * (the details depend on the backend in use). Options like "panscan" are + * applied to determine which part of the video should be visible and how the + * video should be scaled. You can change these options at runtime by using the + * mpv property API. + * + * The renderer will reconfigure itself every time the target surface + * configuration (such as size) is changed. + * + * This function implicitly pulls a video frame from the internal queue and + * renders it. If no new frame is available, the previous frame is redrawn. + * The update callback set with mpv_render_context_set_update_callback() + * notifies you when a new frame was added. The details potentially depend on + * the backends and the provided parameters. + * + * Generally, libmpv will invoke your update callback some time before the video + * frame should be shown, and then lets this function block until the supposed + * display time. This will limit your rendering to video FPS. You can prevent + * this by setting the "video-timing-offset" global option to 0. (This applies + * only to "audio" video sync mode.) + * + * You should pass the following parameters: + * - Backend-specific target object, such as MPV_RENDER_PARAM_OPENGL_FBO. + * - Possibly transformations, such as MPV_RENDER_PARAM_FLIP_Y. + * + * @param ctx a valid render context + * @param params an array of parameters, terminated by type==0. Which parameters + * are required depends on the backend. It's left unspecified what + * happens with unknown parameters. + * @return error code + */ +MPV_EXPORT int mpv_render_context_render(mpv_render_context *ctx, mpv_render_param *params); + +/** + * Tell the renderer that a frame was flipped at the given time. This is + * optional, but can help the player to achieve better timing. + * + * Note that calling this at least once informs libmpv that you will use this + * function. If you use it inconsistently, expect bad video playback. + * + * If this is called while no video is initialized, it is ignored. + * + * @param ctx a valid render context + */ +MPV_EXPORT void mpv_render_context_report_swap(mpv_render_context *ctx); + +/** + * Destroy the mpv renderer state. + * + * If video is still active (e.g. a file playing), video will be disabled + * forcefully. + * + * @param ctx a valid render context. After this function returns, this is not + * a valid pointer anymore. NULL is also allowed and does nothing. + */ +MPV_EXPORT void mpv_render_context_free(mpv_render_context *ctx); + +#ifdef MPV_CPLUGIN_DYNAMIC_SYM + +MPV_DEFINE_SYM_PTR(mpv_render_context_create) +#define mpv_render_context_create pfn_mpv_render_context_create +MPV_DEFINE_SYM_PTR(mpv_render_context_set_parameter) +#define mpv_render_context_set_parameter pfn_mpv_render_context_set_parameter +MPV_DEFINE_SYM_PTR(mpv_render_context_get_info) +#define mpv_render_context_get_info pfn_mpv_render_context_get_info +MPV_DEFINE_SYM_PTR(mpv_render_context_set_update_callback) +#define mpv_render_context_set_update_callback pfn_mpv_render_context_set_update_callback +MPV_DEFINE_SYM_PTR(mpv_render_context_update) +#define mpv_render_context_update pfn_mpv_render_context_update +MPV_DEFINE_SYM_PTR(mpv_render_context_render) +#define mpv_render_context_render pfn_mpv_render_context_render +MPV_DEFINE_SYM_PTR(mpv_render_context_report_swap) +#define mpv_render_context_report_swap pfn_mpv_render_context_report_swap +MPV_DEFINE_SYM_PTR(mpv_render_context_free) +#define mpv_render_context_free pfn_mpv_render_context_free + +#endif + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/libmpv/render_gl.h b/libmpv/render_gl.h new file mode 100644 index 0000000..a2c31f0 --- /dev/null +++ b/libmpv/render_gl.h @@ -0,0 +1,211 @@ +/* Copyright (C) 2018 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. + */ + +#ifndef MPV_CLIENT_API_RENDER_GL_H_ +#define MPV_CLIENT_API_RENDER_GL_H_ + +#include "render.h" + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * OpenGL backend + * -------------- + * + * This header contains definitions for using OpenGL with the render.h API. + * + * OpenGL interop + * -------------- + * + * The OpenGL backend has some special rules, because OpenGL itself uses + * implicit per-thread contexts, which causes additional API problems. + * + * This assumes the OpenGL context lives on a certain thread controlled by the + * API user. All mpv_render_* APIs have to be assumed to implicitly use the + * OpenGL context if you pass a mpv_render_context using the OpenGL backend, + * unless specified otherwise. + * + * The OpenGL context is indirectly accessed through the OpenGL function + * pointers returned by the get_proc_address callback in mpv_opengl_init_params. + * Generally, mpv will not load the system OpenGL library when using this API. + * + * OpenGL state + * ------------ + * + * OpenGL has a large amount of implicit state. All the mpv functions mentioned + * above expect that the OpenGL state is reasonably set to OpenGL standard + * defaults. Likewise, mpv will attempt to leave the OpenGL context with + * standard defaults. The following state is excluded from this: + * + * - the glViewport state + * - the glScissor state (but GL_SCISSOR_TEST is in its default value) + * - glBlendFuncSeparate() state (but GL_BLEND is in its default value) + * - glClearColor() state + * - mpv may overwrite the callback set with glDebugMessageCallback() + * - mpv always disables GL_DITHER at init + * + * Messing with the state could be avoided by creating shared OpenGL contexts, + * but this is avoided for the sake of compatibility and interoperability. + * + * On OpenGL 2.1, mpv will strictly call functions like glGenTextures() to + * create OpenGL objects. You will have to do the same. This ensures that + * objects created by mpv and the API users don't clash. Also, legacy state + * must be either in its defaults, or not interfere with core state. + * + * API use + * ------- + * + * The mpv_render_* API is used. That API supports multiple backends, and this + * section documents specifics for the OpenGL backend. + * + * Use mpv_render_context_create() with MPV_RENDER_PARAM_API_TYPE set to + * MPV_RENDER_API_TYPE_OPENGL, and MPV_RENDER_PARAM_OPENGL_INIT_PARAMS provided. + * + * Call mpv_render_context_render() with MPV_RENDER_PARAM_OPENGL_FBO to render + * the video frame to an FBO. + * + * Hardware decoding + * ----------------- + * + * Hardware decoding via this API is fully supported, but requires some + * additional setup. (At least if direct hardware decoding modes are wanted, + * instead of copying back surface data from GPU to CPU RAM.) + * + * There may be certain requirements on the OpenGL implementation: + * + * - Windows: ANGLE is required (although in theory GL/DX interop could be used) + * - Intel/Linux: EGL is required, and also the native display resource needs + * to be provided (e.g. MPV_RENDER_PARAM_X11_DISPLAY for X11 and + * MPV_RENDER_PARAM_WL_DISPLAY for Wayland) + * - nVidia/Linux: Both GLX and EGL should work (GLX is required if vdpau is + * used, e.g. due to old drivers.) + * - OSX: CGL is required (CGLGetCurrentContext() returning non-NULL) + * - iOS: EAGL is required (EAGLContext.currentContext returning non-nil) + * + * Once these things are setup, hardware decoding can be enabled/disabled at + * any time by setting the "hwdec" property. + */ + +/** + * For initializing the mpv OpenGL state via MPV_RENDER_PARAM_OPENGL_INIT_PARAMS. + */ +typedef struct mpv_opengl_init_params { + /** + * This retrieves OpenGL function pointers, and will use them in subsequent + * operation. + * Usually, you can simply call the GL context APIs from this callback (e.g. + * glXGetProcAddressARB or wglGetProcAddress), but some APIs do not always + * return pointers for all standard functions (even if present); in this + * case you have to compensate by looking up these functions yourself when + * libmpv wants to resolve them through this callback. + * libmpv will not normally attempt to resolve GL functions on its own, nor + * does it link to GL libraries directly. + */ + void *(*get_proc_address)(void *ctx, const char *name); + /** + * Value passed as ctx parameter to get_proc_address(). + */ + void *get_proc_address_ctx; +} mpv_opengl_init_params; + +/** + * For MPV_RENDER_PARAM_OPENGL_FBO. + */ +typedef struct mpv_opengl_fbo { + /** + * Framebuffer object name. This must be either a valid FBO generated by + * glGenFramebuffers() that is complete and color-renderable, or 0. If the + * value is 0, this refers to the OpenGL default framebuffer. + */ + int fbo; + /** + * Valid dimensions. This must refer to the size of the framebuffer. This + * must always be set. + */ + int w, h; + /** + * Underlying texture internal format (e.g. GL_RGBA8), or 0 if unknown. If + * this is the default framebuffer, this can be an equivalent. + */ + int internal_format; +} mpv_opengl_fbo; + +/** + * Deprecated. For MPV_RENDER_PARAM_DRM_DISPLAY. + */ +typedef struct mpv_opengl_drm_params { + int fd; + int crtc_id; + int connector_id; + struct _drmModeAtomicReq **atomic_request_ptr; + int render_fd; +} mpv_opengl_drm_params; + +/** + * For MPV_RENDER_PARAM_DRM_DRAW_SURFACE_SIZE. + */ +typedef struct mpv_opengl_drm_draw_surface_size { + /** + * size of the draw plane surface in pixels. + */ + int width, height; +} mpv_opengl_drm_draw_surface_size; + +/** + * For MPV_RENDER_PARAM_DRM_DISPLAY_V2. + */ +typedef struct mpv_opengl_drm_params_v2 { + /** + * DRM fd (int). Set to -1 if invalid. + */ + int fd; + + /** + * Currently used crtc id + */ + int crtc_id; + + /** + * Currently used connector id + */ + int connector_id; + + /** + * Pointer to a drmModeAtomicReq pointer that is being used for the renderloop. + * This pointer should hold a pointer to the atomic request pointer + * The atomic request pointer is usually changed at every renderloop. + */ + struct _drmModeAtomicReq **atomic_request_ptr; + + /** + * DRM render node. Used for VAAPI interop. + * Set to -1 if invalid. + */ + int render_fd; +} mpv_opengl_drm_params_v2; + + +/** + * For backwards compatibility with the old naming of mpv_opengl_drm_draw_surface_size + */ +#define mpv_opengl_drm_osd_size mpv_opengl_drm_draw_surface_size + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/libmpv/stream_cb.h b/libmpv/stream_cb.h new file mode 100644 index 0000000..9ae6f31 --- /dev/null +++ b/libmpv/stream_cb.h @@ -0,0 +1,247 @@ +/* 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. + */ + +#ifndef MPV_CLIENT_API_STREAM_CB_H_ +#define MPV_CLIENT_API_STREAM_CB_H_ + +#include "client.h" + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * Warning: this API is not stable yet. + * + * Overview + * -------- + * + * This API can be used to make mpv read from a stream with a custom + * implementation. This interface is inspired by funopen on BSD and + * fopencookie on linux. The stream is backed by user-defined callbacks + * which can implement customized open, read, seek, size and close behaviors. + * + * Usage + * ----- + * + * Register your stream callbacks with the mpv_stream_cb_add_ro() function. You + * have to provide a mpv_stream_cb_open_ro_fn callback to it (open_fn argument). + * + * Once registered, you can `loadfile myprotocol://myfile`. Your open_fn will be + * invoked with the URI and you must fill out the provided mpv_stream_cb_info + * struct. This includes your stream callbacks (like read_fn), and an opaque + * cookie, which will be passed as the first argument to all the remaining + * stream callbacks. + * + * Note that your custom callbacks must not invoke libmpv APIs as that would + * cause a deadlock. (Unless you call a different mpv_handle than the one the + * callback was registered for, and the mpv_handles refer to different mpv + * instances.) + * + * Stream lifetime + * --------------- + * + * A stream remains valid until its close callback has been called. It's up to + * libmpv to call the close callback, and the libmpv user cannot close it + * directly with the stream_cb API. + * + * For example, if you consider your custom stream to become suddenly invalid + * (maybe because the underlying stream died), libmpv will continue using your + * stream. All you can do is returning errors from each callback, until libmpv + * gives up and closes it. + * + * Protocol registration and lifetime + * ---------------------------------- + * + * Protocols remain registered until the mpv instance is terminated. This means + * in particular that it can outlive the mpv_handle that was used to register + * it, but once mpv_terminate_destroy() is called, your registered callbacks + * will not be called again. + * + * Protocol unregistration is finished after the mpv core has been destroyed + * (e.g. after mpv_terminate_destroy() has returned). + * + * If you do not call mpv_terminate_destroy() yourself (e.g. plugin-style code), + * you will have to deal with the registration or even streams outliving your + * code. Here are some possible ways to do this: + * - call mpv_terminate_destroy(), which destroys the core, and will make sure + * all streams are closed once this function returns + * - you refcount all resources your stream "cookies" reference, so that it + * doesn't matter if streams live longer than expected + * - create "cancellation" semantics: after your protocol has been unregistered, + * notify all your streams that are still opened, and make them drop all + * referenced resources - then return errors from the stream callbacks as + * long as the stream is still opened + * + */ + +/** + * Read callback used to implement a custom stream. The semantics of the + * callback match read(2) in blocking mode. Short reads are allowed (you can + * return less bytes than requested, and libmpv will retry reading the rest + * with another call). If no data can be immediately read, the callback must + * block until there is new data. A return of 0 will be interpreted as final + * EOF, although libmpv might retry the read, or seek to a different position. + * + * @param cookie opaque cookie identifying the stream, + * returned from mpv_stream_cb_open_fn + * @param buf buffer to read data into + * @param size of the buffer + * @return number of bytes read into the buffer + * @return 0 on EOF + * @return -1 on error + */ +typedef int64_t (*mpv_stream_cb_read_fn)(void *cookie, char *buf, uint64_t nbytes); + +/** + * Seek callback used to implement a custom stream. + * + * Note that mpv will issue a seek to position 0 immediately after opening. This + * is used to test whether the stream is seekable (since seekability might + * depend on the URI contents, not just the protocol). Return + * MPV_ERROR_UNSUPPORTED if seeking is not implemented for this stream. This + * seek also serves to establish the fact that streams start at position 0. + * + * This callback can be NULL, in which it behaves as if always returning + * MPV_ERROR_UNSUPPORTED. + * + * @param cookie opaque cookie identifying the stream, + * returned from mpv_stream_cb_open_fn + * @param offset target absolute stream position + * @return the resulting offset of the stream + * MPV_ERROR_UNSUPPORTED or MPV_ERROR_GENERIC if the seek failed + */ +typedef int64_t (*mpv_stream_cb_seek_fn)(void *cookie, int64_t offset); + +/** + * Size callback used to implement a custom stream. + * + * Return MPV_ERROR_UNSUPPORTED if no size is known. + * + * This callback can be NULL, in which it behaves as if always returning + * MPV_ERROR_UNSUPPORTED. + * + * @param cookie opaque cookie identifying the stream, + * returned from mpv_stream_cb_open_fn + * @return the total size in bytes of the stream + */ +typedef int64_t (*mpv_stream_cb_size_fn)(void *cookie); + +/** + * Close callback used to implement a custom stream. + * + * @param cookie opaque cookie identifying the stream, + * returned from mpv_stream_cb_open_fn + */ +typedef void (*mpv_stream_cb_close_fn)(void *cookie); + +/** + * Cancel callback used to implement a custom stream. + * + * This callback is used to interrupt any current or future read and seek + * operations. It will be called from a separate thread than the demux + * thread, and should not block. + * + * This callback can be NULL. + * + * Available since API 1.106. + * + * @param cookie opaque cookie identifying the stream, + * returned from mpv_stream_cb_open_fn + */ +typedef void (*mpv_stream_cb_cancel_fn)(void *cookie); + +/** + * See mpv_stream_cb_open_ro_fn callback. + */ +typedef struct mpv_stream_cb_info { + /** + * Opaque user-provided value, which will be passed to the other callbacks. + * The close callback will be called to release the cookie. It is not + * interpreted by mpv. It doesn't even need to be a valid pointer. + * + * The user sets this in the mpv_stream_cb_open_ro_fn callback. + */ + void *cookie; + + /** + * Callbacks set by the user in the mpv_stream_cb_open_ro_fn callback. Some + * of them are optional, and can be left unset. + * + * The following callbacks are mandatory: read_fn, close_fn + */ + mpv_stream_cb_read_fn read_fn; + mpv_stream_cb_seek_fn seek_fn; + mpv_stream_cb_size_fn size_fn; + mpv_stream_cb_close_fn close_fn; + mpv_stream_cb_cancel_fn cancel_fn; /* since API 1.106 */ +} mpv_stream_cb_info; + +/** + * Open callback used to implement a custom read-only (ro) stream. The user + * must set the callback fields in the passed info struct. The cookie field + * also can be set to store state associated to the stream instance. + * + * Note that the info struct is valid only for the duration of this callback. + * You can't change the callbacks or the pointer to the cookie at a later point. + * + * Each stream instance created by the open callback can have different + * callbacks. + * + * The close_fn callback will terminate the stream instance. The pointers to + * your callbacks and cookie will be discarded, and the callbacks will not be + * called again. + * + * @param user_data opaque user data provided via mpv_stream_cb_add() + * @param uri name of the stream to be opened (with protocol prefix) + * @param info fields which the user should fill + * @return 0 on success, MPV_ERROR_LOADING_FAILED if the URI cannot be opened. + */ +typedef int (*mpv_stream_cb_open_ro_fn)(void *user_data, char *uri, + mpv_stream_cb_info *info); + +/** + * Add a custom stream protocol. This will register a protocol handler under + * the given protocol prefix, and invoke the given callbacks if an URI with the + * matching protocol prefix is opened. + * + * The "ro" is for read-only - only read-only streams can be registered with + * this function. + * + * The callback remains registered until the mpv core is registered. + * + * If a custom stream with the same name is already registered, then the + * MPV_ERROR_INVALID_PARAMETER error is returned. + * + * @param protocol protocol prefix, for example "foo" for "foo://" URIs + * @param user_data opaque pointer passed into the mpv_stream_cb_open_fn + * callback. + * @return error code + */ +MPV_EXPORT int mpv_stream_cb_add_ro(mpv_handle *ctx, const char *protocol, void *user_data, + mpv_stream_cb_open_ro_fn open_fn); + +#ifdef MPV_CPLUGIN_DYNAMIC_SYM + +MPV_DEFINE_SYM_PTR(mpv_stream_cb_add_ro) +#define mpv_stream_cb_add_ro pfn_mpv_stream_cb_add_ro + +#endif + +#ifdef __cplusplus +} +#endif + +#endif |