WM/MediaClassPrimaryID
[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The WM/MediaClassPrimaryID attribute contains the GUID of the primary media class.
Global Constant
g_wszWMMediaClassPrimaryID
Data Type
WMT_TYPE_GUID
Remarks
This attribute should be set to one of the values in the following table.
| Primary class GUID | Description |
|---|---|
| "D1607DBC-E323-4BE2-86A1-48A42A28441E" | Use for music files. Do not use for audio that is not music. |
| "DB9830BD-3AB3-4FAB-8A37-1A995F7FF74B" | Use for video files. |
| "01CD0F29-DA4E-4157-897B-6275D50C4F11" | Use for audio files that are not music. |
| "FCF24A76-9A57-4036-990D-E35DD8B244E1" | Use for files that are neither audio or video. |
When you specify a primary class identifier, you should also set a secondary class identifier to clarify the type of content in the file.
See also