Converting current CMTime to NSString

cmtime_to_nsstring.m

typedef CMTime(^CurrentCMTime)(void);
static CurrentCMTime _Nonnull current_cmtime = ^ CMTime (void) {
    return CMClockGetTime(CMClockGetHostTimeClock());
};

typedef NSString * _Nonnull (^StringFromTime)(CMTime);
static StringFromTime _Nonnull cmTimeString = ^ NSString * (CMTime cm_time) {
    NSString *stringFromCMTime;
    float seconds = round(CMTimeGetSeconds(cm_time));
    int hh = (int)floorf(seconds / 3600.0f);
    int mm = (int)floorf((seconds - hh * 3600.0f) / 60.0f);
    int ss = (((int)seconds) % 60);
    if (hh > 0)
    {
        stringFromCMTime = [NSString stringWithFormat:@"%02d:%02d:%02d", hh, mm, ss];
    }
    else
    {
        stringFromCMTime = [NSString stringWithFormat:@"%02d:%02d", mm, ss];
    }
    return stringFromCMTime;
};