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audio: Update README.md to add info about the AIDL version

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Bug: 205884982
Test: N/A
Change-Id: Ia1a7879ae538a4e90aee62f9050b9d22ffa64fe7
Merged-In: Ia627e3845a078e6a4c545b13a723a6c5a038c53b
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Mikhail Naganov 2023-01-20 13:48:07 -08:00
parent 5a412d3e11
commit f3ef7fc9cb
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audio/README.md
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Directory structure of the audio HAL related code.
Run `common/all-versions/copyHAL.sh` to create a new version of the audio HAL
based on an existing one.
## Directory Structure for AIDL audio HAL
## Directory Structure
The AIDL version is located inside `aidl` directory. The tree below explains
the role of each subdirectory:
* `aidl_api` — snapshots of the API created each Android release. Every
release, the current version of the API becomes "frozen" and gets assigned
the next version number. If the API needs further modifications, they are
made on the "current" version. After making modifications, run
`m <package name>-update-api` to update the snapshot of the "current"
version.
* `android/hardware/audio/common` — data structures and interfaces shared
between various HALs: BT HAL, core and effects audio HALs.
* `android/hardware/audio/core` — data structures and interfaces of the
core audio HAL.
* `default` — the default, reference implementation of the audio HAL service.
* `vts` — VTS tests for the AIDL HAL.
## Directory Structure for HIDL audio HAL
Run `common/all-versions/copyHAL.sh` to create a new version of the HIDL audio
HAL based on an existing one. Note that this isn't possible since Android T
release. Android U and above uses AIDL audio HAL.
* `2.0` — version 2.0 of the core HIDL API. Note that `.hal` files
can not be moved into the `core` directory because that would change