dcn_bw_fabs
if (margin < 0 && dcn_bw_fabs(margin) > EPSILON)
tb_delta = dcn_bw_fabs(t_active_target - t_active_ref) * (hc_active_target + hc_blank_target_est1) / inter->t_line;
if (margin_target < 0 && dcn_bw_fabs(margin_target) > EPSILON)
#define fabs(var) dcn_bw_fabs(var)
double dcn_bw_fabs(double a);