Re: Get access to the playback mic volume control by in vc++ win32

On Thu, 28 Aug 2008 12:13:08 GMT, Bob Masta wrote:

Thanks, Chris. I understand that ASIO is commonly used for professional
recording systems, and that it doesn't use the Kernel Mixer. That would make
me think that pro recording software doesn't include any mixer functions of its
own and relies on the user manually opening up and using the sound card's
proprietary mixer. Or is there some other driver standard analogous to ASIO for
mixer functions?

Yes, ASIO bypasses everything, you are talking directly to the device
driver via a user mode interface.

The mixing thing can vary slightly between manufacturers depending on what
they offer for controls. For audio capture many professional devices have
only physical gain controls, some may have none, others you may be able to
set in software whether the input is calibrated to -10dBv or +4dBu. Most
provide at least some mixing ability, but this is typically for mixing
input signals to an output or for controlling output gain. Some have
proprietary SDK's for controlling their mixer interface, but there is no
standard unfortunately.

--
http://www.chrisnet.net/code.htm
[MS MVP for DirectShow / MediaFoundation]
.

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