Implement ISCDF Audio Recommandation

[remia]

Support for ISDCF recommandation, eg. Wild Track Audio format for SMPTE DCP B2.1.

These should be warnings.

https://isdcf.com/papers/ISDCF-Doc4-Audio-channel-recommendations.pdf https://isdcf.com/t/SMPTE-DCP-Tests/

[remia]

These are a first list of the new checks that could be added :

• [ ] Channel order is coherent with the recommandation, this is only possible if there is MCA descriptors to actually identify individuals channels roles
• [x] In any configuration, audio channel count shall be an even number
• [ ] Interop compositions shall have no channel labeling (MCA descriptors)

For SMPTE compositions only :

• [ ] Sound Track shall contain Audio Channel Label and Sound Field Group, ie. MCA Sub-Descriptors (see SMPTE 429-2 A.2, D-BOX Technical Note)
• [x] Sound Track WaveAudioEssence.ChannelAssignement shall be set to configuration 4, ie. Wild Track Format
• [ ] CPL MetadataAsset MCA Descriptors should match the ones found in the Sound Track files
• [ ] SMPTE B2.1 Conformance check, ie. CPL and MXF MCA Descriptors presents

[jamiegau]

It should be noted here that SMPTE configuration 4 appears to be the only supported format by many now and it would be recommended to make any other configuration result in a WARNING.

[remia]

Adding Wild Track channel assignment check as part of #207