I also wonder about those sound modes where it's only two channel sound but spatialization was added to the audio streams so when decoded by a Dolby Pro Logic II sound system one gets positional sound much like true multichannel audio. Bioshock 2 has it and it worked when played through a wrapper in OS X. Any variant of WINE only supports two channels yet that type of surround spatialization works in it... even with older miles libraries I have noticed if I can manage to change the sound provider to Dolby.
Also the open sourced darkplaces engine has it if you turn on snd_spatialization_prologic to "1" in the CFG files. The effect it produces is so convincing it almost seems like one has true multichannel in the game rather than two channels which technically speaking it is. Like when passing torches you hear them pan and fade to the correct surround speaker and anything else in a "3D Audio" fashion. You can check out how they did it in their source code
if you wish. But games like Bioshock 2 have it already and it should be possible to translate it to the Mac. I mean if WINE can do it why not? The Mac supports it obviously if it works both in a native port of a game and wrapped ports.
I've even noticed gameplay trailers on youtube encoded with dolby pro logic II specific support such as the Bioshock Infinite 12 minute trailer. I got positional audio from watching those decoded by my stereo. Youtube doesn't support AC3 or DTS or any of those audio codecs.. just two channel sound. Most of the consoles support that as well especially Wii where it's the only choice for surround sound.
More people would be able to get positional audio that way other than the ones who have either third party sound cards or MDP to HDMI adaptors. Such as most of those people who got computer oriented surround systems that only have RCA or optical inputs available.
Also like I've noted elsewhere the FMV's in Batman Arkham Asylum don't correctly use the center channel speaker (or at all really) neither do the "you lose" screens. Borderlands had similar issues when it comes to the players sounds like your own gunfire and voice. Instead of coming from mostly the center speaker with the appropriate reverb from other channels it mostly came from the left and right speakers.
The FMVs could use some kind of programmed in pro logic decoding in the sound libraries if they don't come with more than 2 channel audio tracks and for the latter I'm sure the voices are supposed to come from the center speaker and your own gunfire in Borderlands as well although I'm not sure if it has the same behavior in the PC version.
That being said the true multichannel audio support in Batman Arkham Asylum when in-game is currently the best I have heard so far on the Mac except for the FMVs and losing screens of course.
Alex Delarg, A Clockwork Orange said:
It's funny how the colors of the real world only seem really real when you viddy them on the screen.
the Battle Cat said:
Slower and faster? I'm sorry to hear such good news?
Late '09 27 inch iMac, Core i5 Quad 2.6Ghz, 12GB RAM, ATI Radeon HD4850 512MB, 1TB Hard Drive