+SR_PRIV GVariant *std_gvar_tuple_array(const uint64_t a[][2], unsigned int n);
+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]);
+SR_PRIV GVariant *std_gvar_min_max_step_thresholds(const double dmin, const double dmax, const double dstep);
+
+SR_PRIV GVariant *std_gvar_tuple_u64(uint64_t low, uint64_t high);
+SR_PRIV GVariant *std_gvar_tuple_double(double low, double high);
+
+SR_PRIV GVariant *std_gvar_array_i32(const int32_t *a, unsigned int n);
+SR_PRIV GVariant *std_gvar_array_u32(const uint32_t *a, unsigned int n);
+SR_PRIV GVariant *std_gvar_array_u64(const uint64_t *a, unsigned int n);
+SR_PRIV GVariant *std_gvar_array_str(const char *a[], unsigned int n);
+
+SR_PRIV GVariant *std_gvar_thresholds(const double a[][2], unsigned int n);
+
+SR_PRIV int std_str_idx(GVariant *data, const char *a[], unsigned int n);
+SR_PRIV int std_u64_idx(GVariant *data, const uint64_t a[], unsigned int n);
+SR_PRIV int std_u8_idx(GVariant *data, const uint8_t a[], unsigned int n);
+
+SR_PRIV int std_str_idx_s(const char *s, const char *a[], unsigned int n);
+SR_PRIV int std_u8_idx_s(uint8_t b, const uint8_t a[], unsigned int n);
+
+SR_PRIV int std_u64_tuple_idx(GVariant *data, const uint64_t a[][2], unsigned int n);
+SR_PRIV int std_double_tuple_idx(GVariant *data, const double a[][2], unsigned int n);
+SR_PRIV int std_double_tuple_idx_d0(const double d, const double a[][2], unsigned int n);
+
+SR_PRIV int std_cg_idx(const struct sr_channel_group *cg, struct sr_channel_group *a[], unsigned int n);
+