The FCD 1.0 version of the T/AI 109.7 signalling specification has removed
the inclusion of anc_data_block() in both the AVS2 and AVS3 audio descriptors,
however the source code files are retained here until final determination of
its removal and/or availability in another descriptor.

tsAVSANCDataBlockType.arch-cpp --> tsAVSANCDataBlockType.cpp
tsAVSANCDataBlockType.arch-h --> tsAVSANCDataBlockType.h
tsAVSANCDataBlockType.arch-names --> tsAVSANCDataBlockType.names

It can be included in relevant XML files by including the following definition
    <!-- optional 0..15 allowed  -->
    <anc_data_block>
      <!-- one object_extension_meta_block or loudness_metadata_block element per anc_data_block -->
      <object_extension_metadata_block
        maxObjChannelNum="uint8, required"
        objChannelLock_maxDist="uint4, optional"
        objDiffuse="uint7, required"
        objGain="uint8, required"
        objDivergence="uint4, required"
        objDivergencePosRange="uint4, optional (required if objDivergence > 0)"/>

      <loudness_metadata_block
        samplePeakLevel="uint12, optional"
        truePeakLevel="uint12, required"
        loudnessMeasure="uint4, required">

        <!-- up to 15 loudness values -->
        <loudnessValue
          loudnessValDef="uint4, reqiured"
          loudnessVal="uint8, required"/>
      </loudness_metadata_block>
    </anc_data_block>

