That particular hires sine code was intended for testing the CS4272 DAC on William Hollender's Super Audio Board.
The CS4272 DAC is probably overkill for any application that isn't studio quality broadcasting or "audiophile budget". While the DAC itself isn't terribly expensive, as you can see from William's circuit board, quite a lot of extravagant support circuitry is required to have any hope of actually achieving such incredible performance.
Simpler chips like SGTL5000 or WM8731 are normally used.