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https://github.com/mpv-player/mpv
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![wm4](/assets/img/avatar_default.png)
Reduces code needed for implementing string and int64_t read-only properties. Originally, there actually was a m_property_string_ro(), but it was removed, as that would have implicitly strdup'ed the string. But the new name m_property_strdup_ro() should make it quite clear what is happening.
143 lines
5.1 KiB
C
143 lines
5.1 KiB
C
/*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPLAYER_M_PROPERTY_H
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#define MPLAYER_M_PROPERTY_H
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#include <stdbool.h>
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#include <stdint.h>
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struct m_option;
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extern const struct m_option_type m_option_type_dummy;
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enum mp_property_action {
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// Get the property type. This defines the fundamental data type read from
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// or written to the property.
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// If unimplemented, the m_option entry that defines the property is used.
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// arg: m_option*
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M_PROPERTY_GET_TYPE,
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// Get the current value.
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// arg: pointer to a variable of the type according to the property type
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M_PROPERTY_GET,
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// Set a new value. The property wrapper will make sure that only valid
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// values are set (e.g. according to the property type's min/max range).
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// If unimplemented, the property is read-only.
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// arg: pointer to a variable of the type according to the property type
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M_PROPERTY_SET,
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// Get human readable string representing the current value.
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// If unimplemented, the property wrapper uses the property type as
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// fallback.
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// arg: char**
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M_PROPERTY_PRINT,
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// Switch the property up/down by a given value.
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// If unimplemented, the property wrapper uses the property type as
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// fallback.
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// arg: struct m_property_switch_arg*
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M_PROPERTY_SWITCH,
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// Get a string containing a parsable representation.
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// Can't be overridden by property implementations.
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// arg: char**
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M_PROPERTY_GET_STRING,
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// Set a new value from a string. The property wrapper parses this using the
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// parse function provided by the property type.
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// Can't be overridden by property implementations.
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// arg: char*
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M_PROPERTY_SET_STRING,
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// Pass down an action to a sub-property.
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// arg: struct m_property_action_arg*
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M_PROPERTY_KEY_ACTION,
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};
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// Argument for M_PROPERTY_SWITCH
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struct m_property_switch_arg {
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double inc; // value to add to property, or cycle direction
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bool wrap; // whether value should wrap around on over/underflow
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};
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// Argument for M_PROPERTY_KEY_ACTION
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struct m_property_action_arg {
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const char* key;
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int action;
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void* arg;
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};
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enum mp_property_return {
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// Returned on success.
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M_PROPERTY_OK = 1,
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// Returned on error.
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M_PROPERTY_ERROR = 0,
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// Returned when the property can't be used, for example video related
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// properties while playing audio only.
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M_PROPERTY_UNAVAILABLE = -1,
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// Returned if the requested action is not implemented.
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M_PROPERTY_NOT_IMPLEMENTED = -2,
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// Returned when asking for a property that doesn't exist.
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M_PROPERTY_UNKNOWN = -3,
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};
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// Access a property.
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// action: one of m_property_action
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// ctx: opaque value passed through to property implementation
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// returns: one of mp_property_return
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int m_property_do(const struct m_option* prop_list, const char* property_name,
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int action, void* arg, void *ctx);
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// Print a list of properties.
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void m_properties_print_help_list(const struct m_option* list);
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// Expand a property string.
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// This function allows to print strings containing property values.
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// ${NAME} is expanded to the value of property NAME.
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// If NAME starts with '=', use the raw value of the property.
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// ${NAME:STR} expands to the property, or STR if the property is not
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// available.
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// ${?NAME:STR} expands to STR if the property is available.
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// ${!NAME:STR} expands to STR if the property is not available.
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// General syntax: "${" ["?" | "!"] ["="] NAME ":" STR "}"
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// STR is recursively expanded using the same rules.
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// "$$" can be used to escape "$", and "$}" to escape "}".
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// "$>" disables parsing of "$" for the rest of the string.
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char* m_properties_expand_string(const struct m_option* prop_list, char *str,
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void *ctx);
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// Trivial helpers for implementing properties.
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int m_property_int_ro(const struct m_option* prop, int action, void* arg,
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int var);
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int m_property_int64_ro(const struct m_option* prop, int action, void* arg,
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int64_t var);
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int m_property_float_ro(const struct m_option* prop, int action, void* arg,
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float var);
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int m_property_double_ro(const struct m_option* prop, int action, void* arg,
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double var);
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int m_property_strdup_ro(const struct m_option* prop, int action, void* arg,
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const char *var);
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#endif /* MPLAYER_M_PROPERTY_H */
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