Class Identifiers
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When you create codec or DSP objects using the CoCreateInstance function, you must provide a class identifier. The following table lists the class identifier constants for the supported codec and DSP objects. These constants are defined in the wmcodecdsp.h header file.
Note that the codecs and DSP objects are not supported on all versions of Windows.
| DMO class identifier | Description |
| CLSID_CColorControlDmo | Color transformation DSP. |
| CLSID_CColorConvertDMO | Color conversion DSP. |
| CLSID_CResamplerMediaObject | Audio resampler DSP. |
| CLSID_CFrameRateConvertDmo | Frame rate converter DSP. |
| CLSID_CWMADecMediaObject | Audio decoder. |
| CLSID_CWMAEncMediaObject | Audio encoder. |
| CLSID_CWMVDecMediaObject | Windows Media Video and Windows Media Video 9.1 Image decoder. |
| CLSID_CWMVXEncMediaObject | Windows Media Video 7 and Windows Media Video 8 encoder. |
| CLSID_CWMV9EncMediaObject | Windows Media Video 9 and Windows Media Video 9.1 Image encoder. |
| CLSID_CMSSCDecMediaObject | Screen-capture decoder. |
| CLSID_CMSSCEncMediaObject2 | Screen-capture encoder. |
| CLSID_CWMSPDecMediaObject | Voice decoder. |
| CLSID_CWMSPEncMediaObject2 | Voice encoder. |
| CLSID_CWMAudioAEC | Voice-capture DSP. |
| CLSID_CWMAudioSpdTxDMO | Decoder for Windows Media Audio 10 Professional that outputs to Sony/Philips Digital Interface Format (S/PDIF). |
See Also