MPD for immersive stereo content

To signal immersive stereo content in the MPD file, an additional SupplementalProperty descriptor must be included.

For every presentation in the ac4_toc signaling immersive stereo content, two ac4_presentation_v1_dsi instances are included in the ac4_dsi_v1. The first instance is the immersive stereo presentation and the second instance is a regular stereo-compatible one.

Signaling in the MPD file is based on the first instance only. For the immersive stereo representation in the MPD file, the value attribute of the AudioChannelConfiguration descriptor must be set to 2. The representation must also include the following Supplementalproperty descriptor:

<SupplementalProperty schemeIdUri="tag:dolby.com,2016:dash:virtualized_content:2016" value="1"/>