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MFPKEY_WMADEC_LTRTOUTPUT Property

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Specifies the type of fold down the audio decoder should use.

Constant for IPropertyBag

Available only by using IPropertyStore.

Data Type

VT_BOOL

Default Value

FALSE

Remarks

If this property has a value of FALSE and the output is stereo, the audio decoder uses simple channel fold down. If this property has a value of TRUE, the audio decoder performs Lt-Rt (matrixed) fold down to stereo, and then any Dolby Surround decoder can be used to decode the matrixed surround . For example, the audio decoder could perform Lt-Rt fold down on 5.1 or 7.1 content.

This property is supported only when the decoder is acting as a DirectX Media Object (DMO). No fold down of any kind is supported when the decoder is acting as a Media Foundation Transform (MFT).

On Windows Vista, if you obtain an IPropertyStore interface on an audio decoder, the decoder acts as an MFT. Consequently, this property cannot be used on Windows Vista. For information on when a decoder acts as a DMO or an MFT, see Codec Implementation.

Applies To

This property is available on the decoder of the following codecs:

  • Windows Media Audio 10 Professional

Requirements

Client: Requires Windows 7, Windows Vista, or Windows XP.

Header: Include wmcodecdsp.h.

See Also