AudioChannelConfiguration descriptor

The channel configuration for a Dolby Digital Plus stream is specified in the AudioChannelConfiguration descriptor.

For Dolby Digital Plus bitstreams, the AudioChannelConfiguration descriptor uses the AudioChannelConfiguration scheme described in the schemeIdUri: tag:dolby.com,2014:dash:audio_channel_configuration:2011.

For a Dolby Digital Plus bitstream that carries Dolby Atmos content, this descriptor describes the channel configuration of the backward-compatible channel coding of the presentation.

The value element contains a four-digit hexadecimal representation of the 16-bit bit field, which describes the channel assignment of the referenced Dolby Digital Plus bitstream according to the table.

Table 1. AudioChannelConfiguration descriptor
Bit Location
0 (most-significant bit) L
1 C
2 R
3 Ls
4 Rs
5 Lc/Rc pair
6 Lrs/Rrs pair
7 Cs
8 Ts
9 Lsd/Rsd pair
10 Lw/Rw pair
11 Lvh/Rvh pair
12 Cvh
13 Lts/Rts pair
14 LFE2
15 LFE

Bit 0, which indicates the presence of the L channel, is the most-significant bit of the AudioChannelConfiguration descriptor. For example, to indicate that the channel configuration of the Dolby Digital Plus bitstream is L, C, R, Ls, Rs, LFE, the value element must contain the value F801 (the hexadecimal equivalent of the binary value 1111 1000 0000 0001).