Q_IS_INTERLACED
if (d_q_data->flags & Q_IS_INTERLACED) {
q_data->flags &= ~Q_IS_INTERLACED;
if (!(q_data->flags & Q_IS_INTERLACED)) {
if (s_q_data->flags & Q_IS_INTERLACED) /* interlaced */
if (!(s_q_data->flags & Q_IS_INTERLACED) || !ctx->deinterlacing) {
if ((s_q_data->flags & Q_IS_INTERLACED) &&
!(d_q_data->flags & Q_IS_INTERLACED)) {