That is correct . The only time it is allowed without a warrant is if life is in iminent danger, like a hostage situation.
I would add:
In pursuit of a fleeing felon..
As I recall it, ( as taught ) if an officer is in the act of pursuit of a "suspect" that has committed a felony, and that fleeing felon enters a domicile or building, the officer is considered in "hot pursuit" and can follow without stopping to obtain a warrant..