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format: Add API to query a property's type

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Since a given property can be single-valued, an array or (in the case of
ints) a range, clients need an API to figure out what type of value a
property holds. This adds such an API. The actual property type
enumeration is kept in the PA_PROP_* namespace and not the
PA_FORMAT_INFO* namespace so that it can later be reused for properties
generically if required.
This commit is contained in:
Arun Raghavan 2012-02-06 17:17:34 +05:30
parent 8f850403c0
commit 8baf8e90c2
4 changed files with 104 additions and 0 deletions
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24
src/pulse/format.h
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@ -122,6 +122,30 @@ pa_format_info* pa_format_info_from_sample_spec(pa_sample_spec *ss, pa_channel_m
* a negative integer if conversion failed and 0 on success. \since 2.0 */
int pa_format_info_to_sample_spec(pa_format_info *f, pa_sample_spec *ss, pa_channel_map *map);
/** Represents the type of value type of a property on a \ref pa_format_info. \since 2.0 */
typedef enum pa_prop_type_t {
PA_PROP_TYPE_INT,
/**< Integer property */
PA_PROP_TYPE_INT_RANGE,
/**< Integer range property */
PA_PROP_TYPE_INT_ARRAY,
/**< Integer array property */
PA_PROP_TYPE_STRING,
/**< String property */
PA_PROP_TYPE_STRING_ARRAY,
/**< String array property */
PA_PROP_TYPE_INVALID = -1,
/**< Represents an invalid type */
} pa_prop_type_t;
/** Gets the type of property \a key in a given \ref pa_format_info. \since 2.0 */
pa_prop_type_t pa_format_info_get_prop_type(pa_format_info *f, const char *key);
/** Gets an integer property from the given format info. Returns 0 on success and a negative integer on failure. \since 2.0 */
int pa_format_info_get_prop_int(pa_format_info *f, const char *key, int *v);
/** Gets an integer range property from the given format info. Returns 0 on success and a negative integer on failure.