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Topic: Is there any differences between WASAPI and DS in windows 7 ? (Read 7096 times) previous topic - next topic
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Is there any differences between WASAPI and DS in windows 7 ?

Hello. I'm Korean Middle School Student. 

I'm using Windows 7 service pack 1 now.
I heard that there is no difference between WASAPI and DS in windows 7 because both WASAPI and DS pass KMixer.

Please reply me what is the difference between WASAPI and DS.

※I'm using foobar2000 v1.1.15 beta 1, WASAPI component 3.0 beta 6, some other DSPs(noise sharpening, convolver, resampler(SSRC), bandpass, compressor), and SoundBlaster X-Fi Xtreme Audio.

Is there any differences between WASAPI and DS in windows 7 ?

Reply #1 –
To quote the WASAPI component page: Adds Windows Audio Session API exclusive mode output support, allowing bit-exact output and muting all other sounds on Windows Vista systems. Windows Vista SP1 or newer required.
WASAPI can be useful if you need bit-perfect output to an external receiver, since compared to DirectSound it does not pass KMixer. This also means that you are unable to play any other sound on the device when you use WASAPI, because the OS will not mix audio anymore. I would not recommended to use WASAPI instead of DirectSound if you don't need either bit-perfect output or the muting of other sounds, since generally most devices don't support WASAPI as well as they support DirectSound (though I had no troubles with my Creative card).
It's only audiophile if it's inconvenient.

Is there any differences between WASAPI and DS in windows 7 ?

Reply #2 –
That also depends on the device. For instance, ASUS Xonar series devices pass WASAPI, even exclusive mode, through the DSP and mixer. The only way to obtain unmodified exclusive sound output with those devices is to use ASIO.

Is there any differences between WASAPI and DS in windows 7 ?

Reply #3 –
Quote from: Kohlrabi on
To quote the WASAPI component page: Adds Windows Audio Session API exclusive mode output support, allowing bit-exact output and muting all other sounds on Windows Vista systems. Windows Vista SP1 or newer required.
WASAPI can be useful if you need bit-perfect output to an external receiver, since compared to DirectSound it does not pass KMixer. This also means that you are unable to play any other sound on the device when you use WASAPI, because the OS will not mix audio anymore. I would not recommended to use WASAPI instead of DirectSound if you don't need either bit-perfect output or the muting of other sounds, since generally most devices don't support WASAPI as well as they support DirectSound (though I had no troubles with my Creative card).


Thank you very much. Then can you explain differences between SoundBlaster card's Digital Audio Interface output and Speaker output?

Is there any differences between WASAPI and DS in windows 7 ?

Reply #4 –
Quote from: kode54 on
That also depends on the device. For instance, ASUS Xonar series devices pass WASAPI, even exclusive mode, through the DSP and mixer. The only way to obtain unmodified exclusive sound output with those devices is to use ASIO.


Thank you very much. Now I will try ASIO output.
 

Is there any differences between WASAPI and DS in windows 7 ?

Reply #5 –
ASIO needs to be native (drivers), not the ASIO4ALL...