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ad50acdd5c
Change audio worker threads priority to ..._URGENT_AUDIO to match
the coupled thread in the audio flinger.
Set SCHED_FIFO scheduler for FAST threads (also to match AF fast
mixer/capture threads). In order to enable that, grand SYS_NICE
capability to the HAL service process and provide "getTid"
function in the StreamWorker class. For testing, add a "FAST"
output to the "stub" module in the HAL configuration.
Bug: 286914845
Test: atest libaudioaidlcommon_test
Test: atest VtsHalAudioCoreTargetTest
Test: adb shell ps -A -T -o PID,TID,NI,PCY,PRI,RTPRIO,SCHED,CMD
for the HAL service process during VTS test. For regular
"reader"/"writer" threads should see 'NI 19, PRI 38',
for FAST "writer" should see 'NI -19, PRI 43, RTPRIO 3, SCH 1'
Change-Id: Iab7e21ebc139ff11cf9b7f4a1645960db8dadd43
(cherry picked from commit 4bf6899cc7)
Merged-In: Iab7e21ebc139ff11cf9b7f4a1645960db8dadd43
Audio HAL
Directory structure of the audio HAL related code.
Directory Structure for AIDL audio HAL
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, runm <package name>-update-apito 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.halfiles can not be moved into thecoredirectory 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 inaudio/N.M).7.0— code specific to version V7.0 of the core HIDL APIall-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 (fromhardware/libhardware).util— utilities for the default implementation.
vtsVTS tests for the core HIDL API.
effect— same for the effect HIDL API.2.0config— the XSD schema for the Audio Effects configuration file.
4.0- ...
all-versionsdefault— code that wraps the legacy API (fromhardware/libhardware).util— utilities for the default implementation.
vtsVTS tests for the effect HIDL API.
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.