Windows apps
Collapse the table of content
Expand the table of content
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.


The PKEY_AudioEngine_DeviceFormat property specifies the device format, which is the format that the user has selected for the stream that flows between the audio engine and the audio endpoint device when the device operates in shared mode. This format might not be the best default format for an exclusive-mode application to use. Typically, an exclusive-mode application finds a suitable device format by making some number of calls to the IAudioClient::IsFormatSupported method. For more information, see Device Formats.

The vt member of the PROPVARIANT structure is set to VT_BLOB.

The blob member of the PROPVARIANT structure is a structure of type BLOB that contains two members. Member blob.cbSize is a DWORD that specifies the number of bytes in the format description. Member blob.pBlobData points to a WAVEFORMATEX structure that contains the format description. For more information about BLOB, see the Windows SDK documentation. For more information about WAVEFORMATEX, see the Windows DDK documentation.


Minimum supported client

Windows Vista [desktop apps only]

Minimum supported server

Windows Server 2008 [desktop apps only]



See also

Audio Endpoint Properties
Core Audio Properties



© 2017 Microsoft