The following table lists the supported Dolby channel configurations. If the attribute is not set, the decoder uses a default channel mask, based on the number of channels. If specified, the value must be consistent with the number of audio channels. Specifies the assignment of audio channels to speaker positions. If this attribute is not set, the default value is 2 (stereo). Valid values are in the range 1 (mono) to 8 (7.1 channel configuration). Number of channels, including the low frequency (LFE) channel, if present. Dolby AC-3 streams are limited to the three highest rates in this list. If this attribute is not set, the default value is 48000. The following table lists the requires and optional attributes for the input media type. This subtype can be used interchangeably with MEDIASUBTYPE_DOLBY_AC3. Subtypeĭolby Digital audio see Audio Subtypes. The Dolby audio decoder supports the following input subtypes. The class identifier (CLSID) of the Dolby audio decoder is CLSID_CMSDDPlusDecMFT, defined in the header file wmcodecdsp.h. The decoder can also convert a Dolby Digital Plus stream to Dolby Digital format for AC-3 S/PIDF output, or format a Dolby Digital Plus stream for HDMI digital output.

For versions of Windows prior to Windows 8, the Microsoft implementation of the Dolby Digital technology is restricted under terms of the Dolby Digital licensing program to use by Microsoft applications.įor more information about these formats, refer to Advanced Television Systems Committee (ATSC) document Digital Audio Compression Standard (AC-3, E-AC-3) Revision B.

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