APT-X Options

[slenpree]

see www.aptx.com

this company really annoys me because although they claim APT-X to be so great (near lossless @ 128kbps) there is little evidence to support this claim due to their proprietary nature and hardware focus. Their main codec seems to be common in hardware ISDN codecs due to low delay which suggests low complexity.

All in all I would like to give these folks a chance, they might have some very intelegent (and expensive) sound scientists backing the project. It's come the time where I would like to do some blind listening tests with this codec because with all the focus on MP3 ( and even AAC ) I doubt I will be blown away when comparing it a 128kbps MP3.

However I can't find an APT-X software codec for foobar, or at all. With all the game codec packs for foobar I was quite suprised not to see APT-X as it's been about for quite a while. Perhaps I'm just not looking hard enough and need to use the chinese google. If anyone could save my alot of time and point out the foo_input_aptx component that would be greatly appreciated.

Of course I will share my results on here

Kind Regards,
Jonathan

[jmvalin]

As far as I understand (but I could be wrong), the 2 ms APT-X delay is just the look-ahead, so if you're packetizing, the delay will be more than that. I expect you'll be able to do at least as good with CELT. One other thing to keep in mind is that APX-X is mainly targeted at wireless (non-IP) links and CELT is mainly targeted at IP transmission. That being said, CELT can work on wireless links and I'm sure APT-X can work on IP. Note, that all of this info is guesswork from the APT-X website. I haven't actually tested it myself.