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mpv/options/m_option.h

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/*
* 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_OPTION_H
#define MPLAYER_M_OPTION_H
#include <float.h>
#include <string.h>
#include <stddef.h>
#include <stdbool.h>
#include "misc/bstr.h"
#include "audio/chmap.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_config;
struct mp_log;
struct mpv_node;
struct mpv_global;
///////////////////////////// Options types declarations ////////////////////
// Simple types
extern const m_option_type_t m_option_type_bool;
extern const m_option_type_t m_option_type_flag;
extern const m_option_type_t m_option_type_dummy_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_byte_size;
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_string_append_list;
extern const m_option_type_t m_option_type_keyvalue_list;
extern const m_option_type_t m_option_type_time;
extern const m_option_type_t m_option_type_rel_time;
extern const m_option_type_t m_option_type_choice;
extern const m_option_type_t m_option_type_flags;
extern const m_option_type_t m_option_type_msglevels;
extern const m_option_type_t m_option_type_print_fn;
extern const m_option_type_t m_option_type_imgfmt;
extern const m_option_type_t m_option_type_fourcc;
extern const m_option_type_t m_option_type_afmt;
extern const m_option_type_t m_option_type_color;
extern const m_option_type_t m_option_type_geometry;
extern const m_option_type_t m_option_type_size_box;
extern const m_option_type_t m_option_type_channels;
extern const m_option_type_t m_option_type_aspect;
extern const m_option_type_t m_option_type_obj_settings_list;
extern const m_option_type_t m_option_type_node;
// Used internally by m_config.c
extern const m_option_type_t m_option_type_alias;
extern const m_option_type_t m_option_type_cli_alias;
extern const m_option_type_t m_option_type_removed;
extern const m_option_type_t m_option_type_subconfig;
// Callback used by m_option_type_print_fn options.
typedef void (*m_opt_print_fn)(struct mp_log *log);
enum m_rel_time_type {
REL_TIME_NONE,
REL_TIME_ABSOLUTE,
REL_TIME_RELATIVE,
REL_TIME_PERCENT,
REL_TIME_CHAPTER,
};
struct m_rel_time {
double pos;
enum m_rel_time_type type;
};
struct m_color {
uint8_t r, g, b, a;
};
struct m_geometry {
int x, y, w, h;
bool xy_valid : 1, wh_valid : 1;
bool w_per : 1, h_per : 1;
bool x_sign : 1, y_sign : 1, x_per : 1, y_per : 1;
int ws; // workspace; valid if !=0
};
void m_geometry_apply(int *xpos, int *ypos, int *widw, int *widh,
int scrw, int scrh, struct m_geometry *gm);
struct m_channels {
bool set : 1;
bool auto_safe : 1;
struct mp_chmap *chmaps;
int num_chmaps;
};
struct m_obj_desc {
// Name which will be used in the option string
const char *name;
// Will be printed when "help" is passed
const char *description;
// Size of the private struct
int priv_size;
// If not NULL, default values for private struct
const void *priv_defaults;
// Options which refer to members in the private struct
const struct m_option *options;
// Prefix for each of the above options (none if NULL).
const char *options_prefix;
// For free use by the implementer of m_obj_list.get_desc
const void *p;
// Don't list entry with "help"
bool hidden;
// Callback to print custom help if "vf=entry=help" is passed
void (*print_help)(struct mp_log *log);
// Set by m_obj_list_find(). If the requested name is an old alias, this
// is set to the old name (while the name field uses the new name).
const char *replaced_name;
// For convenience: these are added as global command-line options.
const struct m_sub_options *global_opts;
};
// Extra definition needed for \ref m_option_type_obj_settings_list options.
struct m_obj_list {
bool (*get_desc)(struct m_obj_desc *dst, int index);
const char *description;
// Can be set to a NULL terminated array of aliases
const char *aliases[5][2];
// Allow a trailing ",", which adds an entry with name=""
bool allow_trailer;
// Allow unknown entries, for which a dummy entry is inserted, and whose
// options are skipped and ignored.
bool allow_unknown_entries;
// Callback to test whether an unknown entry should be allowed. (This can
// be useful if adding them as explicit entries is too much work.)
bool (*check_unknown_entry)(const char *name);
// Allow syntax for disabling entries.
bool allow_disable_entries;
// This helps with confusing error messages if unknown flag options are used.
bool disallow_positional_parameters;
// Each sub-item is backed by global options (for AOs and VOs).
bool use_global_options;
// Callback to print additional custom help if "vf=help" is passed
void (*print_help_list)(struct mp_log *log);
// Callback to print help for _unknown_ entries with "vf=entry=help"
void (*print_unknown_entry_help)(struct mp_log *log, const char *name);
};
// Find entry by name
bool m_obj_list_find(struct m_obj_desc *dst, const struct m_obj_list *list,
bstr name);
// The data type used by \ref m_option_type_obj_settings_list.
typedef struct m_obj_settings {
// Type of the object.
char *name;
// Optional user-defined name.
char *label;
// User enable flag.
bool enabled;
// NULL terminated array of parameter/value pairs.
char **attribs;
} m_obj_settings_t;
bool m_obj_settings_equal(struct m_obj_settings *a, struct m_obj_settings *b);
struct m_opt_choice_alternatives {
char *name;
int value;
};
const char *m_opt_choice_str(const struct m_opt_choice_alternatives *choices,
int value);
// Validator function signatures. Required to properly type the param value.
typedef int (*m_opt_generic_validate_fn)(struct mp_log *log, const m_option_t *opt,
struct bstr name, void *value);
typedef int (*m_opt_string_validate_fn)(struct mp_log *log, const m_option_t *opt,
struct bstr name, const char **value);
typedef int (*m_opt_int_validate_fn)(struct mp_log *log, const m_option_t *opt,
struct bstr name, const int *value);
// m_option.priv points to this if OPT_SUBSTRUCT is used
struct m_sub_options {
const char *prefix;
const struct m_option *opts;
size_t size;
const void *defaults;
// Change flags passed to mp_option_change_callback() if any option that is
// directly or indirectly part of this group is changed.
int change_flags;
// Return further sub-options, for example for optional components. If set,
// this is called with increasing index (starting from 0), as long as true
// is returned. If true is returned and *sub is set in any of these calls,
// they are added as options.
bool (*get_sub_options)(int index, const struct m_sub_options **sub);
};
#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_STRING_LIST (&m_option_type_string_list)
#define CONF_TYPE_IMGFMT (&m_option_type_imgfmt)
#define CONF_TYPE_FOURCC (&m_option_type_fourcc)
#define CONF_TYPE_AFMT (&m_option_type_afmt)
#define CONF_TYPE_OBJ_SETTINGS_LIST (&m_option_type_obj_settings_list)
#define CONF_TYPE_TIME (&m_option_type_time)
#define CONF_TYPE_CHOICE (&m_option_type_choice)
#define CONF_TYPE_NODE (&m_option_type_node)
// Possible option values. Code is allowed to access option data without going
// through this union. It serves for self-documentation and to get minimal
// size/alignment requirements for option values in general.
union m_option_value {
bool bool_;
int flag; // not the C type "bool"!
int int_;
int64_t int64;
float float_;
double double_;
char *string;
char **string_list;
char **keyvalue_list;
int imgfmt;
unsigned int fourcc;
int afmt;
m_obj_settings_t *obj_settings_list;
double time;
struct m_rel_time rel_time;
struct m_color color;
struct m_geometry geometry;
struct m_geometry size_box;
struct m_channels channels;
};
////////////////////////////////////////////////////////////////////////////
struct m_option_action {
// The name of the suffix, e.g. "add" for a list. If the option is named
// "foo", this will be available as "--foo-add". Note that no suffix (i.e.
// "--foo" is implicitly always available.
const char *name;
// One of M_OPT_TYPE*.
unsigned int flags;
};
// Option type description
struct m_option_type {
const char *name;
// Size needed for the data.
unsigned int size;
// One of M_OPT_TYPE*.
unsigned int flags;
// Parse the data from a string.
/** It is the only required function, all others can be NULL.
* Generally should not be called directly outside of the options module,
* but instead through \ref m_option_parse which calls additional option
* specific callbacks during the process.
*
* \param log for outputting parser error or help messages
* \param opt The option that is parsed.
* \param name The full option name.
* \param param The parameter to parse.
* may not be an argument meant for this option
* \param dst Pointer to the memory where the data should be written.
* If NULL the parameter validity should still be checked.
* \return On error a negative value is returned, on success the number
* of arguments consumed. For details see \ref OptionParserReturn.
*/
int (*parse)(struct mp_log *log, const m_option_t *opt,
struct bstr name, struct bstr param, void *dst);
// 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);
// Print the value in a human readable form. Unlike print(), it doesn't
// necessarily return the exact value, and is generally not parseable with
// parse().
char *(*pretty_print)(const m_option_t *opt, const void *val);
// Copy data between two locations. Deep copy if the data has pointers.
// The implementation must free *dst if memory allocation is involved.
/** \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);
// Add the value add to the value in val. For types that are not numeric,
// add gives merely the direction. The wrap parameter determines whether
// the value is clipped, or wraps around to the opposite max/min.
void (*add)(const m_option_t *opt, void *val, double add, bool wrap);
// Multiply the value with the factor f. The callback must clip the result
// to the valid value range of the option.
void (*multiply)(const m_option_t *opt, void *val, double f);
// Set the option value in dst to the contents of src.
// (If the option is dynamic, the old value in *dst has to be freed.)
// Return values:
// M_OPT_UNKNOWN: src is in an unknown format
// M_OPT_INVALID: src is incorrectly formatted
// >= 0: success
// other error code: some other error, essentially M_OPT_INVALID refined
int (*set)(const m_option_t *opt, void *dst, struct mpv_node *src);
// Copy the option value in src to dst. Use ta_parent for any dynamic
// memory allocations. It's explicitly allowed to have mpv_node reference
// static strings (and even mpv_node_list.keys), though.
int (*get)(const m_option_t *opt, void *ta_parent, struct mpv_node *dst,
void *src);
// Return whether the values are the same. (There are no "unordered"
// results; for example, two floats with the value NaN compare equal. Other
// ambiguous floats, such as +0 and -0 compare equal. Some option types may
// incorrectly report unequal for values that are equal, such as sets (if
// the element order is different, which incorrectly matters), but values
// duplicated with m_option_copy() always return as equal. Empty strings
// and NULL strings are equal. Ambiguous unicode representations compare
// unequal.)
// If not set, values are always considered equal (=> not really optional).
bool (*equal)(const m_option_t *opt, void *a, void *b);
// Optional: list of suffixes, terminated with a {0} entry. An empty list
// behaves like the list being NULL.
const struct m_option_action *actions;
};
// Option description
struct m_option {
// Option name.
// Option declarations can use this as positional field.
const char *name;
// Option type.
const m_option_type_t *type;
// See \ref OptionFlags.
unsigned int flags;
int offset;
// Most numeric types restrict the range to [min, max] if min<max (this
// implies that if min/max are not set, the full range is used). In all
// cases, the actual range is clamped to the type's native range.
// Float types use [DBL_MIN, DBL_MAX], though by setting min or max to
// -/+INFINITY, the range can be extended to INFINITY. (This part is buggy
// for "float".)
// Preferably use M_RANGE() to set these fields.
double min, max;
// Type dependent data (for all kinds of extended settings).
void *priv;
// Initialize variable to given default before parsing options
const void *defval;
// Print a warning when this option is used (for options with no direct
// replacement.)
const char *deprecation_message;
// Optional function that validates a param value for this option.
m_opt_generic_validate_fn validate;
// Optional function that displays help. Will replace type-specific help.
int (*help)(struct mp_log *log, const m_option_t *opt, struct bstr name);
};
char *format_file_size(int64_t size);
// The option is forbidden in config files.
#define M_OPT_NOCFG (1 << 2)
// The option should be set during command line pre-parsing
#define M_OPT_PRE_PARSE (1 << 4)
// The option expects a file name (or a list of file names)
#define M_OPT_FILE (1 << 5)
// Do not add as property.
#define M_OPT_NOPROP (1 << 6)
// Enable special semantics for some options when parsing the string "help".
#define M_OPT_HAVE_HELP (1 << 7)
// The following are also part of the M_OPT_* flags, and are used to update
// certain groups of options.
#define UPDATE_OPT_FIRST (1 << 8)
#define UPDATE_TERM (1 << 8) // terminal options
#define UPDATE_SUB_FILT (1 << 9) // subtitle filter options
#define UPDATE_OSD (1 << 10) // related to OSD rendering
#define UPDATE_BUILTIN_SCRIPTS (1 << 11) // osc/ytdl/stats
#define UPDATE_IMGPAR (1 << 12) // video image params overrides
#define UPDATE_INPUT (1 << 13) // mostly --input-* options
#define UPDATE_AUDIO (1 << 14) // --audio-channels etc.
#define UPDATE_PRIORITY (1 << 15) // --priority (Windows-only)
#define UPDATE_SCREENSAVER (1 << 16) // --stop-screensaver
#define UPDATE_VOL (1 << 17) // softvol related options
#define UPDATE_LAVFI_COMPLEX (1 << 18) // --lavfi-complex
#define UPDATE_HWDEC (1 << 20) // --hwdec
#define UPDATE_DVB_PROG (1 << 21) // some --dvbin-...
#define UPDATE_SUB_HARD (1 << 22) // subtitle opts. that need full reinit
#define UPDATE_OPT_LAST (1 << 22)
// All bits between _FIRST and _LAST (inclusive)
#define UPDATE_OPTS_MASK \
(((UPDATE_OPT_LAST << 1) - 1) & ~(unsigned)(UPDATE_OPT_FIRST - 1))
// type_float/type_double: string "default" is parsed as NaN (and reverse)
#define M_OPT_DEFAULT_NAN (1 << 25)
// type time: string "no" maps to MP_NOPTS_VALUE (if unset, NOPTS is rejected)
#define M_OPT_ALLOW_NO (1 << 26)
// type channels: disallow "auto" (still accept ""), limit list to at most 1 item.
#define M_OPT_CHANNELS_LIMITED (1 << 27)
// Like M_OPT_TYPE_OPTIONAL_PARAM.
#define M_OPT_OPTIONAL_PARAM (1 << 30)
// These are kept for compatibility with older code.
#define CONF_NOCFG M_OPT_NOCFG
#define CONF_PRE_PARSE M_OPT_PRE_PARSE
// These flags are used to describe special parser capabilities or behavior.
// The parameter is optional and by default no parameter is preferred. If
// ambiguous syntax is used ("--opt value"), the command line parser will
// assume that the argument takes no parameter. In config files, these
// options can be used without "=" and value.
#define M_OPT_TYPE_OPTIONAL_PARAM (1 << 0)
// Behaves fundamentally like a choice or a superset of it (all allowed string
// values are from a fixed set, although other types of values like numbers
// might be allowed too). E.g. m_option_type_choice and m_option_type_flag.
#define M_OPT_TYPE_CHOICE (1 << 1)
// When m_option.min/max are set, they denote a value range.
#define M_OPT_TYPE_USES_RANGE (1 << 2)
///////////////////////////// Parser flags /////////////////////////////////
// OptionParserReturn
//
// On success parsers return a number >= 0.
//
// To indicate that MPlayer should exit without playing anything,
// parsers return M_OPT_EXIT.
//
// 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
// The option doesn't take a parameter.
#define M_OPT_DISALLOW_PARAM -5
// Returned when MPlayer should exit. Used by various help stuff.
#define M_OPT_EXIT -6
char *m_option_strerror(int code);
// Base function to parse options. Includes calling help and validation
// callbacks. Only when this functionality is for some reason required to not
// happen should the parse function pointer be utilized by itself.
//
// See \ref m_option_type::parse.
int m_option_parse(struct mp_log *log, const m_option_t *opt,
struct bstr name, struct bstr param, void *dst);
// 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;
}
static inline char *m_option_pretty_print(const m_option_t *opt,
const void *val_ptr)
{
if (opt->type->pretty_print)
return opt->type->pretty_print(opt, val_ptr);
else
return m_option_print(opt, val_ptr);
}
// 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);
}
// 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);
}
// see m_option_type.set
static inline int m_option_set_node(const m_option_t *opt, void *dst,
struct mpv_node *src)
{
if (opt->type->set)
return opt->type->set(opt, dst, src);
return M_OPT_UNKNOWN;
}
// Call m_option_parse for strings, m_option_set_node otherwise.
int m_option_set_node_or_string(struct mp_log *log, const m_option_t *opt,
const char *name, void *dst, struct mpv_node *src);
// see m_option_type.get
static inline int m_option_get_node(const m_option_t *opt, void *ta_parent,
struct mpv_node *dst, void *src)
{
if (opt->type->get)
return opt->type->get(opt, ta_parent, dst, src);
return M_OPT_UNKNOWN;
}
static inline bool m_option_equal(const m_option_t *opt, void *a, void *b)
{
// Handle trivial equivalence.
// If not implemented, assume this type has no actual values => always equal.
if (a == b || !opt->type->equal)
return true;
return opt->type->equal(opt, a, b);
}
int m_option_required_params(const m_option_t *opt);
extern const char m_option_path_separator;
// Cause a compilation warning if typeof(expr) != type.
// Should be used with pointer types only.
#define MP_EXPECT_TYPE(type, expr) (0 ? (type)0 : (expr))
// This behaves like offsetof(type, member), but will cause a compilation
// warning if typeof(member) != expected_member_type.
// It uses some trickery to make it compile as expression.
#define MP_CHECKED_OFFSETOF(type, member, expected_member_type) \
(offsetof(type, member) + (0 && MP_EXPECT_TYPE(expected_member_type*, \
&((type*)0)->member)))
#define OPT_TYPED_FIELD(type_, c_type, field) \
.type = &type_, \
.offset = MP_CHECKED_OFFSETOF(OPT_BASE_STRUCT, field, c_type)
#define OPTION_LIST_SEPARATOR ','
#define OPTDEF_STR(s) .defval = (void *)&(char * const){s}
#define OPTDEF_INT(i) .defval = (void *)&(const int){i}
#define OPTDEF_INT64(i) .defval = (void *)&(const int64_t){i}
#define OPTDEF_FLOAT(f) .defval = (void *)&(const float){f}
#define OPTDEF_DOUBLE(d) .defval = (void *)&(const double){d}
#define M_RANGE(a, b) .min = (a), .max = (b)
#define OPT_BOOL(field) \
OPT_TYPED_FIELD(m_option_type_bool, bool, field)
#define OPT_FLAG(field) \
OPT_TYPED_FIELD(m_option_type_flag, int, field)
#define OPT_INT(field) \
OPT_TYPED_FIELD(m_option_type_int, int, field)
#define OPT_INT64(field) \
OPT_TYPED_FIELD(m_option_type_int64, int64_t, field)
#define OPT_FLOAT(field) \
OPT_TYPED_FIELD(m_option_type_float, float, field)
#define OPT_DOUBLE(field) \
OPT_TYPED_FIELD(m_option_type_double, double, field)
#define OPT_STRING(field) \
OPT_TYPED_FIELD(m_option_type_string, char*, field)
#define OPT_STRINGLIST(field) \
OPT_TYPED_FIELD(m_option_type_string_list, char**, field)
#define OPT_KEYVALUELIST(field) \
OPT_TYPED_FIELD(m_option_type_keyvalue_list, char**, field)
#define OPT_PATHLIST(field) \
OPT_TYPED_FIELD(m_option_type_string_list, char**, field), \
.priv = (void *)&m_option_path_separator
#define OPT_TIME(field) \
OPT_TYPED_FIELD(m_option_type_time, double, field)
#define OPT_REL_TIME(field) \
OPT_TYPED_FIELD(m_option_type_rel_time, struct m_rel_time, field)
#define OPT_COLOR(field) \
OPT_TYPED_FIELD(m_option_type_color, struct m_color, field)
#define OPT_BYTE_SIZE(field) \
OPT_TYPED_FIELD(m_option_type_byte_size, int64_t, field)
// (Approximation of x<=SIZE_MAX/2 for m_option.max, which is double.)
#define M_MAX_MEM_BYTES MPMIN((1ULL << 62), (size_t)-1 / 2)
#define OPT_GEOMETRY(field) \
OPT_TYPED_FIELD(m_option_type_geometry, struct m_geometry, field)
#define OPT_SIZE_BOX(field) \
OPT_TYPED_FIELD(m_option_type_size_box, struct m_geometry, field)
#define OPT_TRACKCHOICE(field) \
OPT_CHOICE(field, {"no", -2}, {"auto", -1}), \
M_RANGE(0, 8190)
#define OPT_MSGLEVELS(field) \
OPT_TYPED_FIELD(m_option_type_msglevels, char **, field)
#define OPT_ASPECT(field) \
OPT_TYPED_FIELD(m_option_type_aspect, float, field)
#define OPT_IMAGEFORMAT(field) \
OPT_TYPED_FIELD(m_option_type_imgfmt, int, field)
#define OPT_AUDIOFORMAT(field) \
OPT_TYPED_FIELD(m_option_type_afmt, int, field)
#define OPT_CHANNELS(field) \
OPT_TYPED_FIELD(m_option_type_channels, struct m_channels, field)
#define OPT_INT_VALIDATE(field, validate_fn) \
OPT_TYPED_FIELD(m_option_type_int, int, field), \
.validate = (m_opt_generic_validate_fn) \
MP_EXPECT_TYPE(m_opt_int_validate_fn, validate_fn)
#define OPT_STRING_VALIDATE(field, validate_fn) \
OPT_TYPED_FIELD(m_option_type_string, char*, field), \
.validate = (m_opt_generic_validate_fn) \
MP_EXPECT_TYPE(m_opt_string_validate_fn, validate_fn)
#define M_CHOICES(...) \
.priv = (void *)&(const struct m_opt_choice_alternatives[]){ __VA_ARGS__, {0}}
// Variant which takes a pointer to struct m_opt_choice_alternatives directly
#define OPT_CHOICE_C(field, choices) \
OPT_TYPED_FIELD(m_option_type_choice, int, field), \
.priv = (void *)MP_EXPECT_TYPE(const struct m_opt_choice_alternatives*, choices)
// Variant where you pass a struct m_opt_choice_alternatives initializer
#define OPT_CHOICE(field, ...) \
OPT_TYPED_FIELD(m_option_type_choice, int, field), \
M_CHOICES(__VA_ARGS__)
#define OPT_FLAGS(field, ...) \
OPT_TYPED_FIELD(m_option_type_flags, int, field), \
M_CHOICES(__VA_ARGS__)
#define OPT_SETTINGSLIST(field, objlist) \
OPT_TYPED_FIELD(m_option_type_obj_settings_list, m_obj_settings_t*, field), \
.priv = (void*)MP_EXPECT_TYPE(const struct m_obj_list*, objlist)
#define OPT_FOURCC(field) \
OPT_TYPED_FIELD(m_option_type_fourcc, int, field)
#define OPT_CYCLEDIR(field) \
OPT_TYPED_FIELD(m_option_type_cycle_dir, double, field)
// subconf must have the type struct m_sub_options.
// All sub-options are prefixed with "name-" and are added to the current
// (containing) option list.
// If name is "", add the sub-options directly instead.
// "field" refers to the field, that must be a pointer to a field described by
// the subconf struct.
#define OPT_SUBSTRUCT(field, subconf) \
.offset = offsetof(OPT_BASE_STRUCT, field), \
.type = &m_option_type_subconfig, .priv = (void*)&subconf
// Non-fields
#define OPT_ALIAS(newname) \
.type = &m_option_type_alias, .priv = newname, .offset = -1
// If "--optname" was removed, but "--newname" has the same semantics.
// It will be redirected, and a warning will be printed on first use.
#define OPT_REPLACED_MSG(newname, msg) \
.type = &m_option_type_alias, .priv = newname, \
.deprecation_message = (msg), .offset = -1
// Same, with a generic deprecation message.
#define OPT_REPLACED(newname) OPT_REPLACED_MSG(newname, "")
// Alias, resolved on the CLI/config file/profile parser level only.
#define OPT_CLI_ALIAS(newname) \
.type = &m_option_type_cli_alias, .priv = newname, \
.flags = M_OPT_NOPROP, .offset = -1
// "--optname" doesn't exist, but inform the user about a replacement with msg.
#define OPT_REMOVED(msg) \
.type = &m_option_type_removed, .priv = msg, \
.deprecation_message = "", .flags = M_OPT_NOPROP, .offset = -1
#define OPT_PRINT(fn) \
.flags = M_OPT_NOCFG | M_OPT_PRE_PARSE | M_OPT_NOPROP, \
.type = &m_option_type_print_fn, \
.priv = MP_EXPECT_TYPE(m_opt_print_fn, fn), \
.offset = -1
#endif /* MPLAYER_M_OPTION_H */
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