mpv/options/m_config.h

335 lines
14 KiB
C

/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MPLAYER_M_CONFIG_H
#define MPLAYER_M_CONFIG_H
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include "misc/bstr.h"
// m_config provides an API to manipulate the config variables in MPlayer.
// It makes use of the Options API to provide a context stack that
// allows saving and later restoring the state of all variables.
typedef struct m_profile m_profile_t;
struct m_option;
struct m_option_type;
struct m_sub_options;
struct m_obj_desc;
struct m_obj_settings;
struct mp_log;
// Config option
struct m_config_option {
bool is_hidden : 1; // Does not show up in help
bool is_set_from_cmdline : 1; // Set by user from command line
bool is_set_from_config : 1; // Set by a config file
bool is_set_locally : 1; // Has a backup entry
bool warning_was_printed : 1;
int16_t shadow_offset; // Offset into m_config_shadow.data
int16_t group; // Index into m_config.groups
const char *name; // Full name (ie option-subopt)
const struct m_option *opt; // Option description
void *data; // Raw value of the option
const void *default_data; // Raw default value
};
// Config object
/** \ingroup Config */
typedef struct m_config {
struct mp_log *log;
struct mpv_global *global; // can be NULL
// Registered options.
struct m_config_option *opts; // all options, even suboptions
int num_opts;
// Creation parameters
size_t size;
const void *defaults;
const struct m_option *options;
// List of defined profiles.
struct m_profile *profiles;
// Depth when recursively including profiles.
int profile_depth;
struct m_opt_backup *backup_opts;
bool use_profiles;
bool is_toplevel;
int (*includefunc)(void *ctx, char *filename, int flags);
void *includefunc_ctx;
// Can intercept option write accesses.
int (*option_set_callback)(void *ctx, struct m_config_option *co,
void *data, int flags);
void *option_set_callback_cb;
// Notification after an option was successfully written to.
// Uses flags as set in UPDATE_OPTS_MASK.
void (*option_change_callback)(void *ctx, struct m_config_option *co,
int flags);
void *option_change_callback_ctx;
// For the command line parser
int recursion_depth;
void *optstruct; // struct mpopts or other
int shadow_size;
// List of m_sub_options instances.
// Index 0 is the top-level and is always present.
struct m_config_group *groups;
int num_groups;
// Thread-safe shadow memory; only set for the main m_config.
struct m_config_shadow *shadow;
} m_config_t;
// Create a new config object.
// talloc_ctx: talloc parent context for the m_config allocation
// size: size of the optstruct (where option values are stored)
// size==0 creates a config object with no option struct allocated
// defaults: if not NULL, points to a struct of same type as optstruct, which
// contains default values for all options
// options: list of options. Each option defines a member of the optstruct
// and a corresponding option switch or sub-option field.
// Note that the m_config object will keep pointers to defaults and options.
struct m_config *m_config_new(void *talloc_ctx, struct mp_log *log,
size_t size, const void *defaults,
const struct m_option *options);
// Creates "backup" shadow memory for use with m_config_cache. Sets it on
// mpv_global. Expected to be called at early init on the main m_config.
void m_config_create_shadow(struct m_config *config);
struct m_config *m_config_from_obj_desc_noalloc(void *talloc_ctx,
struct mp_log *log,
struct m_obj_desc *desc);
struct m_config *m_config_from_obj_desc_and_args(void *ta_parent,
struct mp_log *log, struct mpv_global *global, struct m_obj_desc *desc,
const char *name, struct m_obj_settings *defaults, char **args);
void *m_config_group_from_desc(void *ta_parent, struct mp_log *log,
struct mpv_global *global, struct m_obj_desc *desc, const char *name);
// Make sure the option is backed up. If it's already backed up, do nothing.
// All backed up options can be restored with m_config_restore_backups().
void m_config_backup_opt(struct m_config *config, const char *opt);
// Call m_config_backup_opt() on all options.
void m_config_backup_all_opts(struct m_config *config);
// Restore all options backed up with m_config_backup_opt(), and delete the
// backups afterwards.
void m_config_restore_backups(struct m_config *config);
enum {
M_SETOPT_PRE_PARSE_ONLY = 1, // Silently ignore non-M_OPT_PRE_PARSE opt.
M_SETOPT_CHECK_ONLY = 2, // Don't set, just check name/value
M_SETOPT_FROM_CONFIG_FILE = 4, // Reject M_OPT_NOCFG opt. (print error)
M_SETOPT_FROM_CMDLINE = 8, // Mark as set by command line
M_SETOPT_BACKUP = 16, // Call m_config_backup_opt() before
M_SETOPT_PRESERVE_CMDLINE = 32, // Don't set if already marked as FROM_CMDLINE
M_SETOPT_NO_FIXED = 64, // Reject M_OPT_FIXED options
M_SETOPT_NO_PRE_PARSE = 128, // Reject M_OPT_PREPARSE options
M_SETOPT_NO_OVERWRITE = 256, // Skip options marked with FROM_*
};
// Flags for safe option setting during runtime.
#define M_SETOPT_RUNTIME M_SETOPT_NO_FIXED
int m_config_set_option_cli(struct m_config *config, struct bstr name,
struct bstr param, int flags);
int m_config_set_option_raw(struct m_config *config, struct m_config_option *co,
void *data, int flags);
void m_config_mark_co_flags(struct m_config_option *co, int flags);
int m_config_set_option_raw_direct(struct m_config *config,
struct m_config_option *co,
void *data, int flags);
struct mpv_node;
int m_config_set_option_node(struct m_config *config, bstr name,
struct mpv_node *data, int flags);
struct m_config_option *m_config_get_co_raw(const struct m_config *config,
struct bstr name);
struct m_config_option *m_config_get_co(const struct m_config *config,
struct bstr name);
int m_config_get_co_count(struct m_config *config);
struct m_config_option *m_config_get_co_index(struct m_config *config, int index);
// Return the n-th option by position. n==0 is the first option. If there are
// less than (n + 1) options, return NULL.
const char *m_config_get_positional_option(const struct m_config *config, int n);
// Return a hint to the option parser whether a parameter is/may be required.
// The option may still accept empty/non-empty parameters independent from
// this, and this function is useful only for handling ambiguous options like
// flags (e.g. "--a" is ok, "--a=yes" is also ok).
// Returns: error code (<0), or number of expected params (0, 1)
int m_config_option_requires_param(struct m_config *config, bstr name);
// Notify m_config_cache users that the option has (probably) changed its value.
void m_config_notify_change_co(struct m_config *config,
struct m_config_option *co);
// Like m_config_notify_change_co(), but automatically find the option by its
// pointer within the global option struct (config->optstruct). In practice,
// it means it works only on fields in MPContext.opts.
void m_config_notify_change_opt_ptr(struct m_config *config, void *ptr);
// Return all (visible) option names as NULL terminated string list.
char **m_config_list_options(void *ta_parent, const struct m_config *config);
void m_config_print_option_list(const struct m_config *config, const char *name);
/* Find the profile with the given name.
* \param config The config object.
* \param arg The profile's name.
* \return The profile object or NULL.
*/
struct m_profile *m_config_get_profile0(const struct m_config *config,
char *name);
struct m_profile *m_config_get_profile(const struct m_config *config, bstr name);
// Apply and clear the default profile - it's the only profile that new config
// files do not simply append to (for configfile parser).
void m_config_finish_default_profile(struct m_config *config, int flags);
/* Get the profile with the given name, creating it if necessary.
* \param config The config object.
* \param arg The profile's name.
* \return The profile object.
*/
struct m_profile *m_config_add_profile(struct m_config *config, char *name);
/* Set the description of a profile.
* Used by the config file parser when defining a profile.
*
* \param p The profile object.
* \param arg The profile's name.
*/
void m_profile_set_desc(struct m_profile *p, bstr desc);
/* Add an option to a profile.
* Used by the config file parser when defining a profile.
*
* \param config The config object.
* \param p The profile object.
* \param name The option's name.
* \param val The option's value.
*/
int m_config_set_profile_option(struct m_config *config, struct m_profile *p,
bstr name, bstr val);
/* Enables profile usage
* Used by the config file parser when loading a profile.
*
* \param config The config object.
* \param p The profile object.
* \param flags M_SETOPT_* bits
* Returns error code (<0) or 0 on success
*/
int m_config_set_profile(struct m_config *config, char *name, int flags);
struct mpv_node m_config_get_profiles(struct m_config *config);
// This can be used to create and synchronize per-thread option structs,
// which then can be read without synchronization. No concurrent access to
// the cache itself is allowed.
struct m_config_cache {
// The struct as indicated by m_config_cache_alloc's group parameter.
void *opts;
// Internal.
struct m_config_shadow *shadow;
struct m_config *shadow_config;
long long ts;
int group;
bool in_list;
// --- Implicitly synchronized by setting/unsetting wakeup_cb.
struct mp_dispatch_queue *wakeup_dispatch_queue;
void (*wakeup_dispatch_cb)(void *ctx);
void *wakeup_dispatch_cb_ctx;
// --- Protected by shadow->lock
void (*wakeup_cb)(void *ctx);
void *wakeup_cb_ctx;
};
// Create a mirror copy from the global options.
// Keep in mind that a m_config_cache object is not thread-safe; it merely
// provides thread-safe access to the global options. All API functions for
// the same m_config_cache object must synchronized, unless otherwise noted.
// ta_parent: parent for the returned allocation
// global: option data source
// group: the option group to return. This can be NULL for the global option
// struct (MPOpts), or m_sub_options used in a certain OPT_SUBSTRUCT()
// item.
struct m_config_cache *m_config_cache_alloc(void *ta_parent,
struct mpv_global *global,
const struct m_sub_options *group);
// If any of the options in the group possibly changes, call this callback. The
// callback must not actually access the cache or anything option related.
// Instead, it must wake up the thread that normally accesses the cache.
void m_config_cache_set_wakeup_cb(struct m_config_cache *cache,
void (*cb)(void *ctx), void *cb_ctx);
// If any of the options in the group change, call this callback on the given
// dispatch queue. This is higher level than m_config_cache_set_wakeup_cb(),
// and you can do anything you want in the callback (assuming the dispatch
// queue is processed in the same thread that accesses m_config_cache API).
// To ensure clean shutdown, you must destroy the m_config_cache (or unset the
// callback) before the dispatch queue is destroyed.
void m_config_cache_set_dispatch_change_cb(struct m_config_cache *cache,
struct mp_dispatch_queue *dispatch,
void (*cb)(void *ctx), void *cb_ctx);
// Update the options in cache->opts to current global values. Return whether
// there was an update notification at all (which may or may not indicate that
// some options have changed).
// Keep in mind that while the cache->opts pointer does not change, the option
// data itself will (e.g. string options might be reallocated).
bool m_config_cache_update(struct m_config_cache *cache);
// Like m_config_cache_alloc(), but return the struct (m_config_cache->opts)
// directly, with no way to update the config. Basically this returns a copy
// with a snapshot of the current option values.
void *mp_get_config_group(void *ta_parent, struct mpv_global *global,
const struct m_sub_options *group);
// Read a single global option in a thread-safe way. For multiple options,
// use m_config_cache. The option must exist and match the provided type (the
// type is used as a sanity check only). Performs semi-expensive lookup.
void mp_read_option_raw(struct mpv_global *global, const char *name,
const struct m_option_type *type, void *dst);
struct m_config *mp_get_root_config(struct mpv_global *global);
#endif /* MPLAYER_M_CONFIG_H */