DASH Representation attribute @qualityRanking with ServiceDescription

[dsilhavy]

A short description of the use case for the new test content.

The @qualityRanking attribute allows the author of the MPD to define a ranking for all the available Representation in a single AdaptationSet. From 23009-1:

qualityRanking specifies a quality ranking of the Representation relative to other Representations in the same Adaptation Set. Lower values represent higher quality content. If not present, then no ranking is defined.

General description and requirements

• A VoD MPD with a single period
• The MPD contains one video and one audio AdaptationSet.
• Each AdaptationSet has a minimum of three different Representations. Each of the Representations has a qualityRanking attribute. qualityRanking values shall range from 0 to 2.
• The MPD contains a ServiceDescription element with two OperatingQuality elements
• The first OperatingQuality element contains the following attributes
  • mediaType set to "video"
  • min set to 0
  • max set to 2
  • target set to 1
• The second OperatingQuality element contains the following attributes
  • mediaType set to "audio"
  • min set to 0
  • max set to 2
  • target set to 1