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 import { Component, OnInit, Input, ElementRef } from '@angular/core';

 // ...

 @Component({
   // ...
 })
 export class CarouselComponent implements OnInit {

   // ...
   @Input() ratio: number = 0.75;
   albumHeight: number;

   // ...

   ngOnInit() {
     // ...
     this.albumHeight = this.ratio * this.elRef.nativeElement.clientWidth;
     this.elRef.nativeElement.style.setProperty('--album-height', this.albumHeight + "px");
   }

 }