Audio HAL

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

• 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 its namespace and include path.
  • config -- the XSD schema for the Audio Policy Manager configuration file.
• 4.0 -- version 4.0 of the core HIDL API.
• ...
• common -- common types for audio core and effect HIDL API.
  • 2.0 -- version 2.0 of the common types HIDL API.
  • 4.0 -- version 4.0.
  • ...
  • 7.0 -- version 7.0.
    • example -- example implementation of the core and effect V7.0 API. It represents a “fake” audio HAL that doesn't actually communicate with hardware.
  • all-versions -- code common to all version of both core and effect API.
    • default -- shared code of the default implementation.
      • service -- vendor HAL service for hosting the default implementation.
    • test -- utilities used by tests.
    • util -- utilities used by both implementation and tests.
• core -- VTS tests and the default implementation of the core API (not HIDL API, it's in audio/N.M).
  • 7.0 -- code specific to version V7.0 of the core HIDL API
  • all-versions -- the code is common between all versions, version-specific parts are enclosed into conditional directives of preprocessor or reside in dedicated files.
    • default -- code that wraps the legacy API (from hardware/libhardware).
    • vts VTS tests for the core HIDL API.
• effect -- same for the effect HIDL API.
  • 2.0
    • config -- the XSD schema for the Audio Effects configuration file.
  • 4.0
  • ...
  • all-versions
    • default
    • vts
• policy -- Configurable Audio Policy schemes.
  • 1.0 -- note that versions of CAP are not linked to the versions of audio HAL.
    • vts -- VTS tests for validating actual configuration files.
    • xml -- XSD schemas for CAP configuration files.