libobs: Add obs_data_array_push_back_array

Allows easily/safely appending all the values of one data array to
another.

libobs/obs-data.c

@@ -1319,6 +1319,19 @@ void obs_data_array_insert(obs_data_array_t *array, size_t idx, obs_data_t *obj)
 	da_insert(array->objects, idx, &obj);
 }
 
+void obs_data_array_push_back_array(obs_data_array_t *array,
+		obs_data_array_t *array2)
+{
+	if (!array || !array2)
+		return;
+
+	for (size_t i = 0; i < array2->objects.num; i++) {
+		obs_data_t *obj = array2->objects.array[i];
+		obs_data_addref(obj);
+	}
+	da_push_back_da(array->objects, array2->objects);
+}
+
 void obs_data_array_erase(obs_data_array_t *array, size_t idx)
 {
 	if (array) {

libobs/obs-data.h

@@ -159,6 +159,8 @@ EXPORT obs_data_t *obs_data_array_item(obs_data_array_t *array, size_t idx);
 EXPORT size_t obs_data_array_push_back(obs_data_array_t *array, obs_data_t *obj);
 EXPORT void obs_data_array_insert(obs_data_array_t *array, size_t idx,
 		obs_data_t *obj);
+EXPORT void obs_data_array_push_back_array(obs_data_array_t *array,
+		obs_data_array_t *array2);
 EXPORT void obs_data_array_erase(obs_data_array_t *array, size_t idx);
 
 /* ------------------------------------------------------------------------- */