package c.i.a.c;

import android.os.Build;
import java.util.HashSet;
/* compiled from: ExoPlayerLibraryInfo */
public final class r0 {
    public static final HashSet<String> a = new HashSet<>();
    public static String b = "goog.exo.core";

    static {
        String str = Build.VERSION.RELEASE;
    }

    public static synchronized void a(String str) {
        synchronized (r0.class) {
            if (a.add(str)) {
                b += ", " + str;
            }
        }
    }
}