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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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74
src/pulse/format.c
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@ -280,6 +280,80 @@ int pa_format_info_to_sample_spec_fake(pa_format_info *f, pa_sample_spec *ss) {
return 0;
}
pa_prop_type_t pa_format_info_get_prop_type(pa_format_info *f, const char *key) {
const char *str;
json_object *o, *o1;
pa_prop_type_t type;
pa_assert(f);
pa_assert(key);
str = pa_proplist_gets(f->plist, key);
if (!str)
return PA_PROP_TYPE_INVALID;
o = json_tokener_parse(str);
if (is_error(o))
return PA_PROP_TYPE_INVALID;
switch (json_object_get_type(o)) {
case json_type_int:
type = PA_PROP_TYPE_INT;
break;
case json_type_string:
type = PA_PROP_TYPE_STRING;
break;
case json_type_array:
if (json_object_array_length(o) == 0) {
/* Unlikely, but let's account for this anyway. We need at
* least one element to figure out the array type. */
type = PA_PROP_TYPE_INVALID;
break;
}
o1 = json_object_array_get_idx(o, 1);
if (json_object_get_type(o1) == json_type_int)
type = PA_PROP_TYPE_INT_ARRAY;
else if (json_object_get_type(o1) == json_type_string)
type = PA_PROP_TYPE_STRING_ARRAY;
else
type = PA_PROP_TYPE_INVALID;
json_object_put(o1);
break;
case json_type_object:
/* We actually know at this point that it's a int range, but let's
* confirm. */
o1 = json_object_object_get(o, PA_JSON_MIN_KEY);
if (!o1) {
type = PA_PROP_TYPE_INVALID;
break;
}
json_object_put(o1);
o1 = json_object_object_get(o, PA_JSON_MAX_KEY);
if (!o1) {
type = PA_PROP_TYPE_INVALID;
break;
}
json_object_put(o1);
type = PA_PROP_TYPE_INT_RANGE;
break;
default:
type = PA_PROP_TYPE_INVALID;
break;
}
json_object_put(o);
return type;
}
int pa_format_info_get_prop_int(pa_format_info *f, const char *key, int *v) {
const char *str;
json_object *o;