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>
	
	