mirror of https://github.com/mpv-player/mpv
202 lines
10 KiB
C
202 lines
10 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef MPLAYER_M_CONFIG_H
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#define MPLAYER_M_CONFIG_H
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#include <stddef.h>
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#include <stdint.h>
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#include <stdbool.h>
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struct mp_dispatch_queue;
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struct m_sub_options;
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struct m_option_type;
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struct m_option;
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struct mpv_global;
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// This can be used to create and synchronize per-thread option structs,
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// which then can be read without synchronization. No concurrent access to
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// the cache itself is allowed.
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struct m_config_cache {
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// The struct as indicated by m_config_cache_alloc's group parameter.
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// (Internally the same as internal->gdata[0]->udata.)
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void *opts;
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// Accumulated change flags. The user can set this to 0 to unset all flags.
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// They are set when calling any of the update functions. A flag is only set
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// once the new value is visible in ->opts.
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uint64_t change_flags;
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// Set to non-NULL for logging all option changes as they are retrieved
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// with one of the update functions (like m_config_cache_update()).
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struct mp_log *debug;
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// Global instance of option data. Read only.
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struct m_config_shadow *shadow;
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// Do not access.
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struct config_cache *internal;
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};
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// Maximum possibly option name buffer length (as it appears to the user).
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#define M_CONFIG_MAX_OPT_NAME_LEN 80
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// Create a mirror copy from the global options.
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// Keep in mind that a m_config_cache object is not thread-safe; it merely
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// provides thread-safe access to the global options. All API functions for
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// the same m_config_cache object must synchronized, unless otherwise noted.
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// This does not create an initial change event (m_config_cache_update() will
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// return false), but note that a change might be asynchronously signaled at any
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// time.
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// This simply calls m_config_cache_from_shadow(ta_parent, global->shadow, group).
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// ta_parent: parent for the returned allocation
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// global: option data source
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// group: the option group to return
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struct m_config_cache *m_config_cache_alloc(void *ta_parent,
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struct mpv_global *global,
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const struct m_sub_options *group);
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// If any of the options in the group possibly changes, call this callback. The
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// callback must not actually access the cache or anything option related.
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// Instead, it must wake up the thread that normally accesses the cache.
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void m_config_cache_set_wakeup_cb(struct m_config_cache *cache,
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void (*cb)(void *ctx), void *cb_ctx);
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// If any of the options in the group change, call this callback on the given
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// dispatch queue. This is higher level than m_config_cache_set_wakeup_cb(),
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// and you can do anything you want in the callback (assuming the dispatch
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// queue is processed in the same thread that accesses m_config_cache API).
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// To ensure clean shutdown, you must destroy the m_config_cache (or unset the
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// callback) before the dispatch queue is destroyed.
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void m_config_cache_set_dispatch_change_cb(struct m_config_cache *cache,
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struct mp_dispatch_queue *dispatch,
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void (*cb)(void *ctx), void *cb_ctx);
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// Update the options in cache->opts to current global values. Return whether
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// there was an update notification at all (which may or may not indicate that
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// some options have changed).
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// Keep in mind that while the cache->opts pointer does not change, the option
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// data itself will (e.g. string options might be reallocated).
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// New change flags are or-ed into cache->change_flags with this call (if you
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// use them, you should probably do cache->change_flags=0 before this call).
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bool m_config_cache_update(struct m_config_cache *cache);
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// Check for changes and return fine grained change information.
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// Warning: this conflicts with m_config_cache_update(). If you call
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// m_config_cache_update(), all options will be marked as "not changed",
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// and this function will return false. Also, calling this function and
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// then m_config_cache_update() is not supported, and may skip updating
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// some fields.
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// This returns true as long as there is a changed option, and false if all
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// changed options have been returned.
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// If multiple options have changed, the new option value is visible only once
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// this function has returned the change for it.
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// out_ptr: pointer to a void*, which is set to the cache->opts field associated
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// with the changed option if the function returns true; set to NULL
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// if no option changed.
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// returns: *out_ptr!=NULL (true if there was a changed option)
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bool m_config_cache_get_next_changed(struct m_config_cache *cache, void **out_ptr);
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// Copy the option field pointed to by ptr to the global option storage. This
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// is sort of similar to m_config_set_option_raw(), except doesn't require
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// access to the main thread. (And you can't pass any flags.)
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// You write the new value to the option struct, and then call this function
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// with the pointer to it. You will not get a change notification for it (though
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// you might still get a redundant wakeup callback).
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// Changing the option struct and not calling this function before any update
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// function (like m_config_cache_update()) will leave the value inconsistent,
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// and will possibly (but not necessarily) overwrite it with the next update
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// call.
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// ptr: points to any field in cache->opts that is managed by an option. If
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// this is not the case, the function crashes for your own good.
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// returns: if true, this was an update; if false, shadow had same value
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bool m_config_cache_write_opt(struct m_config_cache *cache, void *ptr);
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// Like m_config_cache_alloc(), but return the struct (m_config_cache->opts)
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// directly, with no way to update the config. Basically this returns a copy
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// with a snapshot of the current option values.
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void *mp_get_config_group(void *ta_parent, struct mpv_global *global,
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const struct m_sub_options *group);
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// Read a single global option in a thread-safe way. For multiple options,
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// use m_config_cache. The option must exist and match the provided type (the
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// type is used as a sanity check only). Performs semi-expensive lookup.
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// Warning: new code must not use this.
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void mp_read_option_raw(struct mpv_global *global, const char *name,
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const struct m_option_type *type, void *dst);
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// Allocate a priv struct that is backed by global options (like AOs and VOs,
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// anything that uses m_obj_list.use_global_options == true).
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// The result contains a snapshot of the current option values of desc->options.
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// For convenience, desc->options can be NULL; then priv struct is allocated
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// with just zero (or priv_defaults if set).
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// Bad function.
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struct m_obj_desc;
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void *m_config_group_from_desc(void *ta_parent, struct mp_log *log,
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struct mpv_global *global, struct m_obj_desc *desc, const char *name);
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// Allocate new option shadow storage with all options set to defaults.
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// root must stay valid for the lifetime of the return value.
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// Result can be freed with ta_free().
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struct m_config_shadow *m_config_shadow_new(const struct m_sub_options *root);
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// See m_config_cache_alloc().
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struct m_config_cache *m_config_cache_from_shadow(void *ta_parent,
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struct m_config_shadow *shadow,
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const struct m_sub_options *group);
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// Iterate over all registered global options. *p_id must be set to -1 when this
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// is called for the first time. Each time this call returns true, *p_id is set
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// to a new valid option ID. p_id must not be changed for the next call. If
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// false is returned, iteration ends.
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bool m_config_shadow_get_next_opt(struct m_config_shadow *shadow, int32_t *p_id);
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// Similar to m_config_shadow_get_next_opt(), but return only options that are
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// covered by the m_config_cache.
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bool m_config_cache_get_next_opt(struct m_config_cache *cache, int32_t *p_id);
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// Return the m_option that was used to declare this option.
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// id must be a valid option ID as returned by m_config_shadow_get_next_opt() or
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// m_config_cache_get_next_opt().
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const struct m_option *m_config_shadow_get_opt(struct m_config_shadow *shadow,
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int32_t id);
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// Return the full (global) option name. buf must be supplied, but may not
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// always be used. It should have the size M_CONFIG_MAX_OPT_NAME_LEN.
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// The returned point points either to buf or a static string.
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// id must be a valid option ID as returned by m_config_shadow_get_next_opt() or
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// m_config_cache_get_next_opt().
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const char *m_config_shadow_get_opt_name(struct m_config_shadow *shadow,
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int32_t id, char *buf, size_t buf_size);
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// Pointer to default value, using m_option.type. NULL if option without data.
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// id must be a valid option ID as returned by m_config_shadow_get_next_opt() or
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// m_config_cache_get_next_opt().
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const void *m_config_shadow_get_opt_default(struct m_config_shadow *shadow,
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int32_t id);
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// Return the pointer to the allocated option data (the same pointers that are
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// returned by m_config_cache_get_next_changed()). NULL if option without data.
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// id must be a valid option ID as returned by m_config_cache_get_next_opt().
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void *m_config_cache_get_opt_data(struct m_config_cache *cache, int32_t id);
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// Return or-ed UPDATE_OPTS_MASK part of the option and containing sub-options.
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// id must be a valid option ID as returned by m_config_cache_get_next_opt().
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uint64_t m_config_cache_get_option_change_mask(struct m_config_cache *cache,
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int32_t id);
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#endif /* MPLAYER_M_CONFIG_H */
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