MFPKEY_WMAAECMA_DMO_SOURCE_MODE Property
.gif "banner art") |
Specifies whether the Voice Capture DSP uses source mode or filter mode.
Constant for IPropertyBag
Available only by using IPropertyStore.
Data Type
VT_BOOL
Default Value
VARIANT_TRUE
Remarks
In source mode, the application does not need to send input data to the DSP, because the DSP automatically pulls data from the audio devices. In filter mode, the application must send the input data to the DSP.
This property can have the following values.
| Value | Description |
| VARIANT_FALSE | Filter mode. |
| VARIANT_TRUE | Source mode. |
Note In source mode users should only call IMediaObject::SetOutputType to set output stream format, and do not call IMediaObject::SetInputType to set input stream formats. Otherwise DMO initialization will fail.
If the value of this property is VARIANT_TRUE, the DSP has zero inputs. If the value is VARIANT_FALSE, the DSP has one or two inputs, depending on the value of the MFPKEY_WMAAECMA_SYSTEM_MODE property, as shown in the following table.
| Value of MFPKEY_WMAAECMA_SYSTEM_MODE |
Number of inputs |
| OPTIBEAM_ARRAY_AND_AEC | 2 |
| OPTIBEAM_ARRAY_ONLY | 1 |
| SINGLE_CHANNEL_AEC | 2 |
| SINGLE_CHANNEL_NSAGC | 1 |
Note Only modes with a single input will work with the wrapper filter DMO from the DirectShow 9.0 API.
Applies To
Requirements
Client: Requires Windows Vista or Windows XP.
Header: Include wmcodecdsp.h.
See Also