void(* lpc_encode)(int32_t *res, const int32_t *smp, int len, int order, const int32_t *coefs, int shift)
void(* lpc)(int32_t *samples, const int coeffs[32], int order, int qlevel, int len)
void(* decorrelate[4])(uint8_t **out, int32_t **in, int channels, int len, int shift)