What does Psalms Chapter 79 say, and which statements belong to its speaker?

The Latin incipit is Qui regis Israel. The heading describes tribulated church prayer remembering favors. The inscription is for those changed, testimony for Asaph. The speakers ask Israel's ruler leading Joseph like sheep and sitting upon cherubims to hear, shine before Ephraim, Benjamin and Manasses, stir might and save. They ask conversion and shown face, anticipating saving.

They ask how long anger toward servant's prayer and bread and drink of measured tears last, recalling contradiction to neighbors and enemy scoffs, then repeat conversion and face's showing. God brought a vineyard from Egypt, expelled Gentiles, planted and guided it, roots filling land and shadow covering hills and branches cedars. Branches reached sea and boughs river, without named Mediterranean or Euphrates.

They ask why hedge was broken for passers to pluck, recall forest boar wasting and a singular beast devouring, then ask heaven's look, visit and perfection of planting and confirmed son of man. Burned and dug things shall perish at countenance's rebuke; the note says almost consumed vineyard must perish if rebukes continue. They ask hand upon right-hand man and son of man, separately interpreted as Christ. They say they depart not, God shall quicken and they will call, repeating conversion and salvation refrain. No achieved recovery or never-again promise is added.