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Some stuff

Posted by Gordon Rankin (M) on July 11, 2009 at 12:06:54

In Reply to: WASAPI and 24 bit USB - How ? posted by PeterSt on July 11, 2009 at 03:10:22:

Peter,

In the enumeration for these devices the output looks like this to Vista:

Audio Class Specific Audio Data Format
Audio Stream Format Type Desc.
Format Type: 1 PCM
Number Of Channels: 2 STEREO
Sub Frame Size: 3
Bit Resolution: 24
Sample Frequency Type: 0x04 (Discrete)
Sample Frequency: 44100 Hz
Sample Frequency: 48000 Hz
Sample Frequency: 88200 Hz
Sample Frequency: 96000 Hz
~~~~~~~

The problem is there is a small bug in between the USB Audio device driver and the Control Panel which inhibits the 88.2. This will be fixed when 7 is released. I sent one of my dacs and the guys found that problem.

I also sent a Proton to J River they had the same problem you are experiencing. WASAPI worked but exclusive mode did not. They found the problem pretty quickly.

Now all of these CEntrance dacs and mine as well say they are 24 bits. What should happen is if you send 16 bit data it should pad that to 24 bits with zero and then you are done.

It does require that you set the 24 bit option in Foobar/WASAPI for this to work.

I did not ask J River about 88.2 in exclusive mode but I think I remember getting an email saying that it worked. On the Proton is led's indicating the system Sampling Rate set my the USB Audio driver.

Thanks
Gordon
J. Gordon Rankin

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