==== MPEGH_3D_audio_scene_descriptor

Defined by MPEG in <<ISO-13818-1>>.

[source,xml]
----
<MPEGH_3D_audio_scene_descriptor sceneID="uint8, required">

  <!-- up to 127 interactivity groups -->
  <InteractivityGroup
    groupID="uint7, required"
    allowOnOff="bool, required"
    defaultOnOff="bool, required"
    contentKind="uint4, required"
    contentLanguage="char3, optional">

    <PositionInteractivity
      azimuthOffsetMin="uint7, required"
      azimuthOffsetMax="uint7, required"
      elevationOffsetMin="uint5, required"
      elevationOffsetMax="uint5, required"
      distanceOffsetMin="uint4, required"
      distanceOffsetMax="uint4, required"/>

    <GainInteractivity
      interactivityGainMin="uint6, required"
      interactivityGainMax="uint5, required"/>

  </InteractivityGroup>

  <!-- up to 31 switch groups -->
  <SwitchGroup
    switchGroupID="uint5, required"
    switchGroupAllowOnOff="bool, required"
    switchGroupDefaultOnOff="bool, required"
    switchGroupDefaultGroupID="uint7, required">

    <!-- required -->
    <SwitchGroupMembers>
      7bit Hexadecimal content, 1 to 32 values
    </SwitchGroupMembers>

  </SwitchGroup>

  <!-- up to 31 preset groups -->
  <PresetGroup
    groupPresetID="uint5, required"
    groupPresetKind="uint4, required">

    <!-- 1 to 16 preset conditions -->
    <PresetConditions
      groupPresetReferenceID="uint7, required"
      groupPresetDisableGainInteractivity="bool,
          required in groupPresetConditionOnOff=true group"
      groupPresetDisablePositionInteractivity="bool,
          required in groupPresetConditionOnOff=true group"
      groupPresetGain="uint8,
          optional in groupPresetConditionOnOff=true group"
      groupPresetAzOffset="uint8,
          optional in groupPresetConditionOnOff=true group -
          must be specified with groupPresetElOffset and groupPresetDistFactor"
      groupPresetElOffset="uint6,
          optional in groupPresetConditionOnOff=true group -
          must be specified with groupPresetAzOffset and groupPresetDistFactor"
      groupPresetDistFactor="uint4,
          optional in groupPresetConditionOnOff=true group -
          must be specified with groupPresetAzOffset and groupPresetElOffset"/>
  </PresetGroup>

  <reserved>
    Hexadecimal content
  </reserved>

</MPEGH_3D_audio_scene_descriptor>
----
