Directory structure of the audio HIDL related code.
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audio
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|-- 2.0 <== core 2.0 HIDL API. .hal can not be moved into the core directory
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| because that would change its namespace and include path
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|-- 4.0 <== Version 4.0 of the core API
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|-- ...
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|-- common <== code common to audio core and effect API
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| |-- 2.0 <== HIDL API of V2
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| |-- 4.0
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| |-- ...
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| `-- all_versions <== code common to all version of both core and effect API
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| |-- default <== implementation shared code between core and effect impl
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| |-- test <== utilities used by tests
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| `-- util <== utilities used by both implementation and tests
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|-- core <== VTS and default implementation of the core API (not HIDL, see /audio/2.0))
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| `-- all_versions <== Code is version independent through #if and separate files
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| |-- default <== code that wraps the legacy API
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| `-- vts <== vts of core API
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| |-- 2.0 <== 2.0 specific tests and helpers
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| |-- 4.0
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| |-- ...
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`-- effect <== idem for the effect API
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|-- 2.0
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|-- 4.0
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|-- ...
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`-- all_versions
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|-- default
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`-- vts
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