SR_PRIV GVariant *std_gvar_tuple_rational(const struct sr_rational *r, unsigned int n);
SR_PRIV GVariant *std_gvar_samplerates(const uint64_t samplerates[], unsigned int n);
SR_PRIV GVariant *std_gvar_samplerates_steps(const uint64_t samplerates[], unsigned int n);
+SR_PRIV GVariant *std_gvar_min_max_step(double min, double max, double step);
+SR_PRIV GVariant *std_gvar_min_max_step_array(const double a[3]);
/*--- resource.c ------------------------------------------------------------*/