mpv/m_option.h

521 lines
20 KiB
C

/*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPLAYER_M_OPTION_H
#define MPLAYER_M_OPTION_H
#include <string.h>
#include <stddef.h>
#include "config.h"
// m_option allows to parse, print and copy data of various types.
typedef struct m_option_type m_option_type_t;
typedef struct m_option m_option_t;
struct m_struct_st;
///////////////////////////// Options types declarations ////////////////////
// Simple types
extern const m_option_type_t m_option_type_flag;
extern const m_option_type_t m_option_type_int;
extern const m_option_type_t m_option_type_int64;
extern const m_option_type_t m_option_type_intpair;
extern const m_option_type_t m_option_type_float;
extern const m_option_type_t m_option_type_double;
extern const m_option_type_t m_option_type_string;
extern const m_option_type_t m_option_type_string_list;
extern const m_option_type_t m_option_type_position;
extern const m_option_type_t m_option_type_time;
extern const m_option_type_t m_option_type_time_size;
extern const m_option_type_t m_option_type_choice;
extern const m_option_type_t m_option_type_print;
extern const m_option_type_t m_option_type_print_indirect;
extern const m_option_type_t m_option_type_print_func;
extern const m_option_type_t m_option_type_subconfig;
extern const m_option_type_t m_option_type_imgfmt;
extern const m_option_type_t m_option_type_afmt;
// Func-based types
extern const m_option_type_t m_option_type_func_param;
extern const m_option_type_t m_option_type_func;
// Callback used to reset func options.
typedef void (*m_opt_default_func_t)(const m_option_t *, const char *);
// Callback used by m_option_type_func_full options.
typedef int (*m_opt_func_full_t)(const m_option_t *, const char *, const char *);
// Callback used by m_option_type_func_param options.
typedef int (*m_opt_func_param_t)(const m_option_t *, const char *);
// Callback used by m_option_type_func options.
typedef int (*m_opt_func_t)(const m_option_t *);
// Backwards compatibility
typedef m_opt_default_func_t cfg_default_func_t;
typedef m_opt_func_full_t cfg_func_arg_param_t;
typedef m_opt_func_param_t cfg_func_param_t;
typedef m_opt_func_t cfg_func_t;
#define END_AT_NONE 0
#define END_AT_TIME 1
#define END_AT_SIZE 2
typedef struct {
double pos;
int type;
} m_time_size_t;
// Extra definition needed for \ref m_option_type_obj_settings_list options.
typedef struct {
// Pointer to an array of pointer to some object type description struct.
void **list;
// Offset of the object type name (char*) in the description struct.
void *name_off;
// Offset of the object type info string (char*) in the description struct.
void *info_off;
// Offset of the object type parameter description (\ref m_struct_st)
// in the description struct.
void *desc_off;
} m_obj_list_t;
// The data type used by \ref m_option_type_obj_settings_list.
typedef struct m_obj_settings {
// Type of the object.
char *name;
// NULL terminated array of parameter/value pairs.
char **attribs;
} m_obj_settings_t;
// A parser to set up a list of objects.
/** It creates a NULL terminated array \ref m_obj_settings. The option priv
* field (\ref m_option::priv) must point to a \ref m_obj_list_t describing
* the available object types.
*/
extern const m_option_type_t m_option_type_obj_settings_list;
// Extra definition needed for \ref m_option_type_obj_presets options.
typedef struct {
// Description of the struct holding the presets.
const struct m_struct_st *in_desc;
// Description of the struct that should be set by the presets.
const struct m_struct_st *out_desc;
// Pointer to an array of structs defining the various presets.
const void *presets;
// Offset of the preset's name inside the in_struct.
void *name_off;
} m_obj_presets_t;
// Set several fields in a struct at once.
/** For this two struct descriptions are used. One for the struct holding the
* preset and one for the struct beeing set. Every field present in both
* structs will be copied from the preset struct to the destination one.
* The option priv field (\ref m_option::priv) must point to a correctly
* filled \ref m_obj_presets_t.
*/
extern const m_option_type_t m_option_type_obj_presets;
// Parse an URL into a struct.
/** The option priv field (\ref m_option::priv) must point to a
* \ref m_struct_st describing which fields of the URL must be used.
*/
extern const m_option_type_t m_option_type_custom_url;
// Extra definition needed for \ref m_option_type_obj_params options.
typedef struct {
// Field descriptions.
const struct m_struct_st *desc;
// Field separator to use.
char separator;
} m_obj_params_t;
// Parse a set of parameters.
/** Parameters are separated by the given separator and each one
* successively sets a field from the struct. The option priv field
* (\ref m_option::priv) must point to a \ref m_obj_params_t.
*/
extern const m_option_type_t m_option_type_obj_params;
typedef struct {
int start;
int end;
} m_span_t;
// Ready made settings to parse a \ref m_span_t with a start-end syntax.
extern const m_obj_params_t m_span_params_def;
struct m_opt_choice_alternatives {
char *name;
int value;
};
// FIXME: backward compatibility
#define CONF_TYPE_FLAG (&m_option_type_flag)
#define CONF_TYPE_INT (&m_option_type_int)
#define CONF_TYPE_INT64 (&m_option_type_int64)
#define CONF_TYPE_FLOAT (&m_option_type_float)
#define CONF_TYPE_DOUBLE (&m_option_type_double)
#define CONF_TYPE_STRING (&m_option_type_string)
#define CONF_TYPE_FUNC (&m_option_type_func)
#define CONF_TYPE_FUNC_PARAM (&m_option_type_func_param)
#define CONF_TYPE_PRINT (&m_option_type_print)
#define CONF_TYPE_PRINT_INDIRECT (&m_option_type_print_indirect)
#define CONF_TYPE_PRINT_FUNC (&m_option_type_print_func)
#define CONF_TYPE_SUBCONFIG (&m_option_type_subconfig)
#define CONF_TYPE_STRING_LIST (&m_option_type_string_list)
#define CONF_TYPE_POSITION (&m_option_type_position)
#define CONF_TYPE_IMGFMT (&m_option_type_imgfmt)
#define CONF_TYPE_AFMT (&m_option_type_afmt)
#define CONF_TYPE_SPAN (&m_option_type_span)
#define CONF_TYPE_OBJ_SETTINGS_LIST (&m_option_type_obj_settings_list)
#define CONF_TYPE_OBJ_PRESETS (&m_option_type_obj_presets)
#define CONF_TYPE_CUSTOM_URL (&m_option_type_custom_url)
#define CONF_TYPE_OBJ_PARAMS (&m_option_type_obj_params)
#define CONF_TYPE_TIME (&m_option_type_time)
#define CONF_TYPE_TIME_SIZE (&m_option_type_time_size)
////////////////////////////////////////////////////////////////////////////
// Option type description
struct m_option_type {
const char *name;
// Syntax description, etc
const char *comments;
// Size needed for the data.
unsigned int size;
// See \ref OptionTypeFlags.
unsigned int flags;
// Parse the data from a string.
/** It is the only required function, all others can be NULL.
*
* \param opt The option that is parsed.
* \param name The full option name.
* \param param The parameter to parse.
* \param dst Pointer to the memory where the data should be written.
* If NULL the parameter validity should still be checked.
* \param src Source of the option, see \ref OptionParserModes.
* \return On error a negative value is returned, on success the number of arguments
* consumed. For details see \ref OptionParserReturn.
*/
int (*parse)(const m_option_t *opt, const char *name, const char *param, void *dst, int src);
// Print back a value in string form.
/** \param opt The option to print.
* \param val Pointer to the memory holding the data to be printed.
* \return An allocated string containing the text value or (void*)-1
* on error.
*/
char *(*print)(const m_option_t *opt, const void *val);
/** \name
* These functions are called to save/set/restore the status of the
* variables. The difference between the 3 only matters for types like
* \ref m_option_type_func where 'setting' needs to do more than just
* copying some data.
*/
//@{
// Update a save slot (dst) from the current value in the program (src).
/** \param opt The option to copy.
* \param dst Pointer to the destination memory.
* \param src Pointer to the source memory.
*/
void (*save)(const m_option_t *opt, void *dst, const void *src);
// Set the value in the program (dst) from a save slot.
/** \param opt The option to copy.
* \param dst Pointer to the destination memory.
* \param src Pointer to the source memory.
*/
void (*set)(const m_option_t *opt, void *dst, const void *src);
// Copy the data between two save slots. If NULL and size is > 0 a memcpy will be used.
/** \param opt The option to copy.
* \param dst Pointer to the destination memory.
* \param src Pointer to the source memory.
*/
void (*copy)(const m_option_t *opt, void *dst, const void *src);
//@}
// Free the data allocated for a save slot.
/** This is only needed for dynamic types like strings.
* \param dst Pointer to the data, usually a pointer that should be freed and
* set to NULL.
*/
void (*free)(void *dst);
};
// Option description
struct m_option {
// Option name.
const char *name;
// Reserved for higher level APIs, it shouldn't be used by parsers.
/** The suboption parser and func types do use it. They should instead
* use the priv field but this was inherited from older versions of the
* config code.
*/
void *p;
// Option type.
const m_option_type_t *type;
// See \ref OptionFlags.
unsigned int flags;
// \brief Mostly useful for numeric types, the \ref M_OPT_MIN flags must
// also be set.
double min;
// \brief Mostly useful for numeric types, the \ref M_OPT_MAX flags must
// also be set.
double max;
// Type dependent data (for all kinds of extended settings).
/** This used to be a function pointer to hold a 'reverse to defaults' func.
* Now it can be used to pass any type of extra args needed by the parser.
* Passing a 'default func' is still valid for all func based option types.
*/
void *priv;
int new;
int offset;
};
// The option has a minimum set in \ref m_option::min.
#define M_OPT_MIN (1 << 0)
// The option has a maximum set in \ref m_option::max.
#define M_OPT_MAX (1 << 1)
// The option has a minimum and maximum in m_option::min and m_option::max.
#define M_OPT_RANGE (M_OPT_MIN | M_OPT_MAX)
// The option is forbidden in config files.
#define M_OPT_NOCFG (1 << 2)
// The option is forbidden on the command line.
#define M_OPT_NOCMD (1 << 3)
// The option is global in the \ref Config.
/** It won't be saved on push and the command line parser will set it when
* it's parsed (i.e. it won't be set later)
* e.g options : -v, -quiet
*/
#define M_OPT_GLOBAL (1 << 4)
// The \ref Config won't save this option on push.
/** It won't be saved on push but the command line parser will add it with
* its entry (i.e. it may be set later)
* e.g options : -include
*/
#define M_OPT_NOSAVE (1 << 5)
// The option should be set during command line pre-parsing
#define M_OPT_PRE_PARSE (1 << 6)
// These are kept for compatibility with older code.
#define CONF_MIN M_OPT_MIN
#define CONF_MAX M_OPT_MAX
#define CONF_RANGE M_OPT_RANGE
#define CONF_NOCFG M_OPT_NOCFG
#define CONF_NOCMD M_OPT_NOCMD
#define CONF_GLOBAL M_OPT_GLOBAL
#define CONF_NOSAVE M_OPT_NOSAVE
#define CONF_PRE_PARSE M_OPT_PRE_PARSE
// These flags are used to describe special parser capabilities or behavior.
// Suboption parser flag.
/** When this flag is set, m_option::p should point to another m_option
* array. Only the parse function will be called. If dst is set, it should
* create/update an array of char* containg opt/val pairs. The options in
* the child array will then be set automatically by the \ref Config.
* Also note that suboptions may be directly accessed by using
* -option:subopt blah.
*/
#define M_OPT_TYPE_HAS_CHILD (1 << 0)
// Wildcard matching flag.
/** If set the option type has a use for option names ending with a *
* (used for -aa*), this only affects the option name matching.
*/
#define M_OPT_TYPE_ALLOW_WILDCARD (1 << 1)
// Dynamic data type.
/** This flag indicates that the data is dynamically allocated (m_option::p
* points to a pointer). It enables a little hack in the \ref Config wich
* replaces the initial value of such variables with a dynamic copy in case
* the initial value is statically allocated (pretty common with strings).
*/
#define M_OPT_TYPE_DYNAMIC (1 << 2)
// Indirect option type.
/** If this is set the parse function doesn't directly return
* the wanted thing. Options use this if for some reasons they have to wait
* until the set call to be able to correctly set the target var.
* So for those types new values must first be parsed, then set to the target
* var. If this flag isn't set then new values can be parsed directly to the
* target var. It's used by the callback-based options as the callback call
* may append later on.
*/
#define M_OPT_TYPE_INDIRECT (1 << 3)
///////////////////////////// Parser flags /////////////////////////////////
// Some parsers behave differently depending on the mode passed in the src
// parameter of m_option_type::parse. For example the flag type doesn't take
// an argument when parsing from the command line.
// Set when parsing from a config file.
#define M_CONFIG_FILE 0
// Set when parsing command line arguments.
#define M_COMMAND_LINE 1
// Set when pre-parsing the command line
#define M_COMMAND_LINE_PRE_PARSE 2
// On success parsers return the number of arguments consumed: 0 or 1.
//
// To indicate that MPlayer should exit without playing anything,
// parsers return M_OPT_EXIT minus the number of parameters they
// consumed: \ref M_OPT_EXIT or \ref M_OPT_EXIT-1.
//
// On error one of the following (negative) error codes is returned:
// For use by higher level APIs when the option name is invalid.
#define M_OPT_UNKNOWN -1
// Returned when a parameter is needed but wasn't provided.
#define M_OPT_MISSING_PARAM -2
// Returned when the given parameter couldn't be parsed.
#define M_OPT_INVALID -3
// Returned if the value is "out of range". The exact meaning may
// vary from type to type.
#define M_OPT_OUT_OF_RANGE -4
// Returned if the parser failed for any other reason than a bad parameter.
#define M_OPT_PARSER_ERR -5
// Returned when MPlayer should exit. Used by various help stuff.
/** M_OPT_EXIT must be the lowest number on this list.
*/
#define M_OPT_EXIT -6
// These are kept for compatibility with older code.
//
#define ERR_NOT_AN_OPTION M_OPT_UNKNOWN
#define ERR_MISSING_PARAM M_OPT_MISSING_PARAM
#define ERR_OUT_OF_RANGE M_OPT_OUT_OF_RANGE
#define ERR_FUNC_ERR M_OPT_PARSER_ERR
// Find the option matching the given name in the list.
/** \ingroup Options
* This function takes the possible wildcards into account (see
* \ref M_OPT_TYPE_ALLOW_WILDCARD).
*
* \param list Pointer to an array of \ref m_option.
* \param name Name of the option.
* \return The matching option or NULL.
*/
const m_option_t *m_option_list_find(const m_option_t *list, const char *name);
static inline void *m_option_get_ptr(const struct m_option *opt,
void *optstruct)
{
return opt->new ? (char *) optstruct + opt->offset : opt->p;
}
// Helper to parse options, see \ref m_option_type::parse.
static inline int m_option_parse(const m_option_t *opt, const char *name,
const char *param, void *dst, int src)
{
return opt->type->parse(opt, name, param, dst, src);
}
// Helper to print options, see \ref m_option_type::print.
static inline char *m_option_print(const m_option_t *opt, const void *val_ptr)
{
if (opt->type->print)
return opt->type->print(opt, val_ptr);
else
return NULL;
}
// Helper around \ref m_option_type::copy.
static inline void m_option_copy(const m_option_t *opt, void *dst,
const void *src)
{
if (opt->type->copy)
opt->type->copy(opt, dst, src);
else if (opt->type->size > 0)
memcpy(dst, src, opt->type->size);
}
// Helper around \ref m_option_type::free.
static inline void m_option_free(const m_option_t *opt, void *dst)
{
if (opt->type->free)
opt->type->free(dst);
}
/*@}*/
/**
* Parse a string as a timestamp.
*
* @param[in] str the string to parse.
* @param[out] time parsed time.
* @param[in] endchar return an error of the next character after the
* timestamp is neither nul nor endchar.
* @return Number of chars in the timestamp.
*/
int parse_timestring(const char *str, double *time, char endchar);
#define OPTION_LIST_SEPARATOR ','
#if HAVE_DOS_PATHS
#define OPTION_PATH_SEPARATOR ';'
#else
#define OPTION_PATH_SEPARATOR ':'
#endif
#define OPT_FLAG_ON(optname, varname, flags) {optname, NULL, &m_option_type_flag, flags, 0, 1, NULL, 1, offsetof(struct MPOpts, varname)}
#define OPT_FLAG_OFF(optname, varname, flags) {optname, NULL, &m_option_type_flag, flags, 1, 0, NULL, 1, offsetof(struct MPOpts, varname)}
#define OPT_MAKE_FLAGS(optname, varname, flags) OPT_FLAG_ON(optname, varname, flags), OPT_FLAG_OFF("no" optname, varname, flags)
#define OPT_FLAG_CONSTANTS(optname, varname, flags, offvalue, value) {optname, NULL, &m_option_type_flag, flags, offvalue, value, NULL, 1, offsetof(struct MPOpts, varname)}
#define OPT_STRINGLIST(optname, varname, flags) {optname, NULL, &m_option_type_string_list, flags, 0, 0, NULL, 1, offsetof(struct MPOpts, varname)}
#define OPT_PATHLIST(optname, varname, flags) {optname, NULL, &m_option_type_string_list, flags, 0, 0, (void *)&(const char){OPTION_PATH_SEPARATOR}, 1, offsetof(struct MPOpts, varname)}
#define OPT_INT(optname, varname, flags) {optname, NULL, &m_option_type_int, flags, 0, 0, NULL, 1, offsetof(struct MPOpts, varname)}
#define OPT_INTRANGE(optname, varname, flags, min, max) {optname, NULL, &m_option_type_int, (flags) | CONF_RANGE, min, max, NULL, 1, offsetof(struct MPOpts, varname)}
#define OPT_INTPAIR(optname, varname, flags) {optname, NULL, &m_option_type_intpair, (flags), 0, 0, NULL, 1, offsetof(struct MPOpts, varname)}
#define OPT_FLOATRANGE(optname, varname, flags, min, max) {optname, NULL, &m_option_type_float, (flags) | CONF_RANGE, min, max, NULL, 1, offsetof(struct MPOpts, varname)}
#define OPT_STRING(optname, varname, flags) {optname, NULL, &m_option_type_string, flags, 0, 0, NULL, 1, offsetof(struct MPOpts, varname)}
#define OPT_SETTINGSLIST(optname, varname, flags, objlist) {optname, NULL, &m_option_type_obj_settings_list, flags, 0, 0, objlist, 1, offsetof(struct MPOpts, varname)}
#define OPT_AUDIOFORMAT(optname, varname, flags) {optname, NULL, &m_option_type_afmt, flags, 0, 0, NULL, 1, offsetof(struct MPOpts, varname)}
#define OPT_HELPER_REMOVEPAREN(...) __VA_ARGS__
#define OPT_CHOICE(optname, varname, flags, choices) {optname, NULL, &m_option_type_choice, flags, 0, 0, &(const struct m_opt_choice_alternatives[]){OPT_HELPER_REMOVEPAREN choices, {NULL}}, 1, offsetof(struct MPOpts, varname)}
#endif /* MPLAYER_M_OPTION_H */