The Pioneer DV-747 was modified with a board, which converts the DSD-Signal to PCM and outputs that on three separate SP-DIF outputs (Left/Right, Center/Sub, Left Surround/Right Surround). The converted signal is 88 kHz/24 Bit and can be feed into a digital sound capture card. I use a Juli@ PCI-Soundcard from ESI on an old G4 Mac (should also work on Intel Mac PROs).
These boards were mainly developed by a Swiss speaker company (which produced the Campana digital speakers) to connect DVD-Audio players digitally to their speakers and sold through a Swiss company DVD-Upgrades. In case anyone is interested, there might still be some boards around for older Pioneer players, though they are no longer listed on their web site (which is now http://www.highdefinition.ch). I could check with the engineers.
Peter