summaryrefslogtreecommitdiffstats
path: root/m_property.h
blob: e43dc597ad454792b829499f7a40c3224e4d01f6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178

/// \defgroup Properties
///
/// Properties provide an interface to query and set the state of various
/// things in MPlayer. The API is based on the \ref Options API like the
/// \ref Config, but instead of using variables, properties use an ioctl like
/// function. The function is used to perform various actions like get and set
/// (see \ref PropertyActions).
///@{

/// \file

/// \defgroup PropertyActions Property actions
/// \ingroup Properties
///@{

/// Get the current value.
/** \param arg Pointer to a variable of the right type.
 */
#define M_PROPERTY_GET         0

/// Get a string representing the current value.
/** Set the variable to a newly allocated string or NULL.
 *  \param arg Pointer to a char* variable.
 */
#define M_PROPERTY_PRINT       1

/// Set a new value.
/** The variable is updated to the value actually set.
 *  \param arg Pointer to a variable of the right type.
 */
#define M_PROPERTY_SET         2

/// Set a new value from a string.
/** \param arg String containing the value.
 */
#define M_PROPERTY_PARSE       3

/// Increment the current value.
/** The sign of the argument is also taken into account if applicable.
 *  \param arg Pointer to a variable of the right type or NULL.
 */
#define M_PROPERTY_STEP_UP     4

/// Decrement the current value.
/** The sign of the argument is also taken into account if applicable.
 *  \param arg Pointer to a variable of the right type or NULL.
 */
#define M_PROPERTY_STEP_DOWN   5

///@}

/// \defgroup PropertyActionsReturn Property actions return code
/// \ingroup Properties
/// \brief  Return values for the control function.
///@{

/// Returned on success.
#define M_PROPERTY_OK                1

/// Returned on error.
#define M_PROPERTY_ERROR             0

/// \brief Returned when the property can't be used, for example something about
/// the subs while playing audio only
#define M_PROPERTY_UNAVAILABLE      -1

/// Returned if the requested action is not implemented.
#define M_PROPERTY_NOT_IMPLEMENTED  -2

/// Returned when asking for a property that doesn't exist.
#define M_PROPERTY_UNKNOWN          -3

/// Returned when the action can't be done (like setting the volume when edl mute).
#define M_PROPERTY_DISABLED         -4

///@}

/// \ingroup Properties
/// \brief Property action callback.
typedef int(*m_property_ctrl_f)(m_option_t* prop,int action,void* arg);

/// Do an action on a property.
/** \param prop The property.
 *  \param action See \ref PropertyActions.
 *  \param arg Argument, usually a pointer to the data type used by the property.
 *  \return See \ref PropertyActionsReturn.
 */
int m_property_do(m_option_t* prop, int action, void* arg);

/// Print the current value of a property.
/** \param prop The property.
 *  \return A newly allocated string with the current value or NULL on error.
 */
char* m_property_print(m_option_t* prop);

/// Set a property.
/** \param prop The property.
 *  \param txt The value to set.
 *  \return 1 on success, 0 on error.
 */
int m_property_parse(m_option_t* prop, char* txt);

/// Print a list of properties.
void m_properties_print_help_list(m_option_t* list);

/// Expand a property string.
/** This function allows to print strings containing property values.
 *  ${NAME} is expanded to the value of property NAME or an empty
 *  string in case of error. $(NAME:STR) expand STR only if the property
 *  NAME is available.
 * 
 *  \param prop_list An array of \ref m_option describing the available
 *                   properties.
 *  \param str The string to expand.
 *  \return The newly allocated expanded string.
 */
char* m_properties_expand_string(m_option_t* prop_list,char* str);

// Helpers to use MPlayer's properties

/// Get an MPlayer property.
m_option_t*  mp_property_find(const char* name);

/// Do an action with an MPlayer property.
int mp_property_do(const char* name,int action, void* val);

/// \defgroup PropertyImplHelper Property implementation helpers
/// \ingroup Properties
/// \brief Helper functions for common property types.
///@{

/// Clamp a value according to \ref m_option::min and \ref m_option::max.
#define M_PROPERTY_CLAMP(prop,val) do {                                 \
        if(((prop)->flags & M_OPT_MIN) && (val) < (prop)->min)          \
            (val) = (prop)->min;                                        \
        else if(((prop)->flags & M_OPT_MAX) && (val) > (prop)->max)     \
            (val) = (prop)->max;                                        \
    } while(0)

/// Implement get.
int m_property_int_ro(m_option_t* prop,int action,
                      void* arg,int var);

/// Implement set, get and step up/down.
int m_property_int_range(m_option_t* prop,int action,
                         void* arg,int* var);

/// Same as m_property_int_range but cycle.
int m_property_choice(m_option_t* prop,int action,
                      void* arg,int* var);

/// Switch betwen min and max.
int m_property_flag(m_option_t* prop,int action,
                    void* arg,int* var);

/// Implement get, print.
int m_property_float_ro(m_option_t* prop,int action,
                        void* arg,float var);

/// Implement set, get and step up/down
int m_property_float_range(m_option_t* prop,int action,
                           void* arg,float* var);

/// float with a print function which print the time in ms
int m_property_delay(m_option_t* prop,int action,
                     void* arg,float* var);

/// Implement get, print
int m_property_double_ro(m_option_t* prop,int action,
                         void* arg,double var);

/// get/print the string
int m_property_string_ro(m_option_t* prop,int action,void* arg, char* str);

///@}

///@}