WASAPI is not bit perfect

[regal]

Did a test today with Windows 7 64 bit Foobar2000 and WASAPI. It does not pass an HDCD decodeable bit stream to a downstream HDCD decoding DAC.

Yet anoth bitperfect myth, you must use ASIO to get bit perfect out of your computer.

 

[leeperry]

maybe this is relevant? http://www.head-fi.org/forums/5890444-post45.html

you didn't specify what soundcard you used...it would appear that it's got bit-matched ASIO drivers, but not KS/WASAPI....a wild guess would be that you tried a X-Fi?

WASAPI *is* bit-perfect, but it's only an audio renderer to your system audio drivers....if your audio drivers like to resample and what not, then you're SOL anyway.

 

[regal]

That must explain it I have an EMU 0404 PCI

 

[krmathis]

Interesting indeed!
Guess those MS Windows Vista users claiming WASAPI is the way to go for bit-perfect audio need to suck up their words..

 

[Mr. B]

...just as well if true. I never was able to get it to work under Windows 7 RC x64.

 

[Geohound]

not sure that I can tell a difference but I switched over to the creative ASIO, I have no reason not to believe you.

 

[[L]es]

i haven't used wasapi in a long time. never did like it. it didn't sound as transparent as ASIO. running asus xonar hdav asio right now.

 

[sonci]

I`ve noticed too, with xfi in vista, while playing in Foobar different sample rates files, the Audio Creation Mode(bitmatched playback) doesnt change the sample rate according to the file, while it does always using ASIO.

Never posted cause, a lot here use asus STX which its not bit perfect by default..

 

[leeperry]

you're only as strong as your weakest link, that's all...it'd be like having a shielded door w/ a crappy lock.

M-Audio/RME/Echo Digital offer bit-perfect MME/ASIO/KS/WASAPI(WaveRT) drivers, but your average consumer brand couldn't care less(that includes all the cards using C-Media DSP chips/drivers)

Creative and E-mu only do bit-perfect in ASIO.

I've been in contact w/ Asus lately, and they've promised to release bit-matched drivers(automatic hardware samplerate, forbidding SRC) for the STX/ST anytime soon...time will tell!

 

[Bredin]

What about ESI? Thinking of upgrading from Razer Barracuda to ESI Maya44.

 

[ROBSCIX]

Most recording card will have bit perfect ASIO drivers.

 

[KingStyles]

I have a realtek high def card. Is wasapi bit perfect through it?

 

[ROBSCIX]

Realtek high def card? You mean an onboard?

 

[anadin]

I use Wasapi with a PCI Express X-Fi Xtreme Audio Soundcard via a toshlink cable running into a Cambridge Audio DacMagic, the DacMagic reports that Wasapi is bit perfect.

 

[Ham Sandwich]

Quote:

Originally Posted by anadin /img/forum/go_quote.gif I use Wasapi with a PCI Express X-Fi Xtreme Audio Soundcard via a toshlink cable running into a Cambridge Audio DacMagic, the DacMagic reports that Wasapi is bit perfect.

How are you verifying bit perfectness using the DacMagic? The DacMagic doesn't do HDCD so you can't base a test on it lighting up its HDCD light. The lights on the front of the DacMagic just show you the incoming sample rate, not that the incoming data is bit perfect. You could feed the data from the DacMagic to a second DAC that does do HDCD to verify bit perfectness that way.