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The Dolby audio decoder is a Media Foundation transform (MFT) that decodes the following stream types:

Dolby Digital, also called Dolby AC-3
Dolby Digital Plus, also called Enhanced AC-3 (E-AC-3)

Important

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.

For more information about these formats, refer to Advanced Television Systems Committee (ATSC) document Digital Audio Compression Standard (AC-3, E-AC-3) Revision B.

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.

Class Identifier

The class identifier (CLSID) of the Dolby audio decoder is CLSID_CMSDDPlusDecMFT, defined in the header file wmcodecdsp.h.

Input Types

The Dolby audio decoder supports the following input subtypes.

Subtype	Description	Header
MEDIASUBTYPE_DOLBY_AC3	Dolby Digital audio.	mfapi.h
MEDIASUBTYPE_DVM	Dolby Digital audio; see Audio Subtypes. This subtype can be used interchangeably with MEDIASUBTYPE_DOLBY_AC3.	wmcodecdsp.h
MFAudioFormat_Dolby_Digital_Plus	Dolby Digital Plus audio.	mfapi.h

The following table lists the requires and optional attributes for the input media type.

Attribute	Description	Remarks
MF_MT_MAJOR_TYPE	Major type.	Required. Must be MFMediaType_Audio.
MF_MT_SUBTYPE	Audio subtype.	Required. See the previous table for details.
MF_MT_AUDIO_SAMPLES_PER_SECOND	Sample rate, in samples per second.	Optional. Valid values are: 48000, 44100, 32000, 24000, 22050, and 16000. If this attribute is not set, the default value is 48000. [!Note] Dolby AC-3 streams are limited to the three highest rates in this list.
MF_MT_AUDIO_NUM_CHANNELS	Number of channels, including the low frequency (LFE) channel, if present.	Optional. Valid values are in the range 1 (mono) to 8 (7.1 channel configuration). If this attribute is not set, the default value is 2 (stereo).
MF_MT_AUDIO_CHANNEL_MASK	Specifies the assignment of audio channels to speaker positions.	Optional. If specified, the value must be consistent with the number of audio channels. If the attribute is not set, the decoder uses a default channel mask, based on the number of channels.

The following table lists the supported Dolby channel configurations.

Channel configuration	Number of channels	Channel masks
1/0 (mono)	1	0x4 (SPEAKER_FRONT_CENTER)
2/0 (stereo) or 1+1 (dual mono)	2	0x3 (SPEAKER_FRONT_LEFT \| SPEAKER_FRONT_RIGHT)
3/0	3	0x7 (SPEAKER_FRONT_LEFT \| SPEAKER_FRONT_RIGHT \| SPEAKER_FRONT_CENTER)
2/1	3	0x103 (SPEAKER_FRONT_LEFT \| SPEAKER_FRONT_RIGHT \| SPEAKER_BACK_CENTER)
3/1	4	0x107 (SPEAKER_FRONT_LEFT \| SPEAKER_FRONT_RIGHT \| SPEAKER_FRONT_CENTER \| SPEAKER_BACK_CENTER)
2/2	4	0x33 (SPEAKER_FRONT_LEFT \| SPEAKER_FRONT_RIGHT \| SPEAKER_BACK_LEFT \| SPEAKER_BACK_RIGHT) or 0x603 (SPEAKER_FRONT_LEFT \| SPEAKER_FRONT_RIGHT \| SPEAKER_SIDE_LEFT \| SPEAKER_SIDE_RIGHT)
3/2	5	0x37 (SPEAKER_FRONT_LEFT \| SPEAKER_FRONT_RIGHT \| SPEAKER_FRONT_CENTER \| SPEAKER_BACK_LEFT \| SPEAKER_BACK_RIGHT) or 0x607 (SPEAKER_FRONT_LEFT \| SPEAKER_FRONT_RIGHT \| SPEAKER_FRONT_CENTER \| SPEAKER_SIDE_LEFT \| SPEAKER_SIDE_RIGHT)
3/2 + LFE	6	0x3F (SPEAKER_FRONT_LEFT \| SPEAKER_FRONT_RIGHT \| SPEAKER_FRONT_CENTER \| SPEAKER_LOW_FREQUENCY \| SPEAKER_BACK_LEFT \| SPEAKER_BACK_RIGHT) or 0x60F (SPEAKER_FRONT_LEFT \| SPEAKER_FRONT_RIGHT \| SPEAKER_FRONT_CENTER \| SPEAKER_LOW_FREQUENCY \| SPEAKER_SIDE_LEFT \| SPEAKER_SIDE_RIGHT)
3/2/2 + LFE [!Note] Dolby Digital Plus only.	8	0x63F (SPEAKER_FRONT_LEFT \| SPEAKER_FRONT_RIGHT \| SPEAKER_FRONT_CENTER \| SPEAKER_LOW_FREQUENCY \| SPEAKER_BACK_LEFT \| SPEAKER_BACK_RIGHT \| SPEAKER_SIDE_LEFT \| SPEAKER_SIDE_RIGHT)

In addition, channel configurations 1/0, 2/0, 3/0, 2/1, 3/1, and 2/2 may also appear with an LFE channel.

Output Types

Alice madness returns. The Dolby audio decoder supports the following output subtypes.

Subtype	Description	Header
MFAudioFormat_Dolby_AC3_SPDIF	Dolby AC-3 audio formatted for S/PDIF digital output.	mfapi.h
KSDATAFORMAT_SUBTYPE_IEC61937_DOLBY_DIGITAL_PLUS	Dolby Digital Plus audio formatted for HDMI digital output.	ksmedia.h
MFAudioFormat_Float	IEEE 32-bit floating-point PCM audio Windows 10: stereo, 5.1, 7.1 Previous versions: stereo, 5.1	mfapi.h
MFAudioFormat_PCM	16-bit PCM audio Windows 10: stereo, 5.1, 7.1 Previous versions: stereo, 5.1	mfapi.h

The following table lists the required and optional attributes for the output media type.

Attribute	Description	Remarks
MF_MT_MAJOR_TYPE	Major type.	Required. Must be MFMediaType_Audio.
MF_MT_SUBTYPE	Audio subtype.	Required. See the previous table for details.
MF_MT_AUDIO_SAMPLES_PER_SECOND	Sample rate, in samples per second.	Required. Valid values are: 48000, 44100, 32000, 24000, 22050, and 16000. The output sample rate must be identical to the input sample rate. The decoder cannot change the sampling rate of the stream.
MF_MT_AUDIO_NUM_CHANNELS	Number of channels, including the low frequency (LFE) channel, if present.	Required for PCM output. Not needed for digital output. If the input type is mono, stereo, or dual-mono (all without LFE channel), the only valid value is 2, for stereo output. Otherwise, the value can be: 2 for stereo downmix 6 for 5.1 channel configurations 8 for

Dolby Digital Driver Windows 10