• Introduction to the Dolby Digital format
• Dolby Digital EX
• Dolby Headphone

1. As we talked about in Part 1, Dolby Atmos is supported in two codecs - Dolby TrueHD and Dolby Digital Plus. Before 2016, televisions only supported Dolby Digital over HDMI ARC and haven’t been upgraded to support Dolby Digital Plus passthrough. However, most recent televisions now support Dolby Digital Plus over HDMI ARC.
2. The decoder accepts only raw Dolby streams, as defined by A/52B. Payloads such as Packetized Elementary Streams (PES) are not supported. For Dolby Digital Plus, the decoder decodes up to 5.1 channels. On Windows 10, 7.1 channel streams are decoded without downmix.
3. Dolby Access v3.5.197.0 Available on Windows 10 PCs with Windows 10 19H1 and above.

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Introduction to the Dolby Digital format

Launched in 1987, the Dolby Digital format is a digital audio encoding standard developed by Dolby Labs.

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Unlike Dolby ProLogic systems, Dolby Digital audio tracks are independent (the term 'discrete' is also sometimes used). For consumer electronics, the Dolby Digital format relies on a compression algorithm called AC3 (Audio Coding 3), which can compress audio streams by a factor of 10 to 12 with a 16-bit sampling rate of 48 kHz, for an overall bitrate of 384 kbps. For this reason, the Dolby Digital format is sometimes called Dolby AC3. For professionals, instead of an AC3 decoder, Dolby Digital uses a system called SR-D.

Dolby Digital is likely the most commonly used system in home theatre systems. To be able to use media recorded in Dolby Digital format (DVD video or DVD audio, for example), you need a device with an integrated AC3 decoder. These devices are normally identified by the presence of this logo:

The Dolby Digital format allows for surround sound, as it uses six independent audio channels:

• A central speaker, generally placed atop or above the screen, for reproducing dialogue.
• Two audio tracks for the front speakers, for accentuating the context of the sound coming from the central speaker.
• Two channels for the rear speakers, used for reproducing noise and the sound environment, in order to create ambiance.
• A channel for low frequencies (a subwoofer) for amplifying special effects (like explosions and earthquakes).

The Dolby Digital format's bandwidth falls between 20 Hz and 20 kHz. Dolby Digital audiotape can be encoded in either of the following formats:

• in stereo
• n 5.1. It should be noted that Dolby Digital is often incorrectly confused with the generic term '5.1'.

Dolby Digital EX

Dolby Digital EX has an additional channel (the term '6.1' is sometimes used) created with two rear channels in order to hide the 'sound gap' which exists behind the listener. Dolby Digital EX devices traditionally have the following logo:

However, a Dolby Digital EX can be read just as easily by a traditional Dolby Digital 5.1 decoder.

Dolby Headphone

The Dolby Headphone standard is used to privately enjoy surround sound with a traditional set of headphones, without bothering nearby people, using a stereo or multichannel source.

Dolby Headphone is based on a process called 'virtualization,' which uses HRTF (Head Related Transfer Functions) to simulate 3D sound by taking into account the distortion of sound as it passes through the different parts of the listener's head, and combining this information with the acoustics of a virtual listening room.

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Devices (like sound cards, home theatre systems, videogame consoles, etc) compatible with Dolby Headphone bear this symbol:

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.

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

The following table lists the supported Dolby channel configurations.

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

The Dolby audio decoder supports the following output subtypes.

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

Transform Attributes

Download nova studio for mac. The Dolby audio decoder implements the IMFTransform::GetAttributes method. The application can use this method to get or set the following attributes.

Remarks

The decoder accepts only raw Dolby streams, as defined by A/52B. Payloads such as Packetized Elementary Streams (PES) are not supported. For Dolby Digital Plus, the decoder decodes up to 5.1 channels. On Windows 10, 7.1 channel streams are decoded without downmix. On previous OS versions, if the stream is 7.1 channels, only the 5.1 channel downmix will be decoded. If the stream is Dolby Digital Plus with more than one independent substream, only independent substream 0 is decoded. The decoder skips other independent substreams. In addition, the decoder skips all dependent substreams. The decoder supports decryption and decoding of streams that are protected by Digital Rights Management (DRM) technology.

If the input media type has a channel configuration other than mono, stereo, or dual-mono (all without LFE channel), the decoder provides two options for the output channel configurations:

• 8-channel output (7.1 channel configuration)
• 6-channel output (5.1 channel configuration)
• Stereo downmix

If stereo downmix is selected, the type of downmix can be set on the MFT by using the CODECAPI_AVDecDDStereoDownMixMode property.

If the output type is MFAudioFormat_Dolby_AC3_SPDIF, each output buffer contains 6,144 bytes. The buffer starts with an 8-byte S/PDIF header, followed by a compressed AC-3 frame, followed by zero padding to 6,144 bytes.

If the output type is KSDATAFORMAT_SUBTYPE_IEC61937_DOLBY_DIGITAL_PLUS, each output buffer contains 24,576 bytes. The buffer starts with an 8-byte S/PDIF header, followed by 1–6 compressed Dolby Digital Plus frames corresponding to 1,536 PCM samples, followed by zero padding to 24,576 bytes. For HDMI output, only independent substream 0 is packed.

The decoder MFT is registered with the flag MFT_ENUM_FLAG_FIELDOFUSE, which indicates that the MFT that must be unlocked by the application before use. For more information, see Field of Use Restrictions.

Requirements

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See also