tree d34277a80c131aa7595d3f8329cf93bd1091242f
parent 554d2e74c7a63ca2b5dda0398bf17cf5386a1e12
author Amy Zhang <amyjojo@google.com> 1593059164 -0700
committer Amy Zhang <amyjojo@google.com> 1593546261 +0000

Grant the privileged app - SampleTunerTvInputService access to the Tuner HAL service

We have a new Tuner HAL design in Android R to support Android TV Broadcast TV solution
Please see the design doc: https://docs.google.com/document/d/1ZeCs4BYCWB27fZnYRDW5O6i3HMsXE4ZGimiWugrmxDg/edit?usp=sharing

The overall structure of this design is:
Privileged apps use Tuner java framework to access the Tuner HAL through the Tuner JNI
There is a system service - TunerResourceManager that would be used in the Tuner java framework to manager Tuner related resources
Whenever the privileged apps request a resource, the TunerResourceManager checks its permission and priority to help Tuner java make decision
Tuner HAL service access is also protected by the selinux policy

Tuner HAL 1.0: https://source.corp.google.com/android/hardware/interfaces/tv/tuner/1.0/
Tuner HAL service sepolicy: https://source.corp.google.com/android/system/sepolicy/public/hal_tv_tuner.te?q=hal_tv_tuner.te
TunerJava: https://source.corp.google.com/android/frameworks/base/media/java/android/media/tv/tuner/Tuner.java;l=197?q=%22This%20class%20is%20used%20to%20interact%20with%20hardware%20tuners%20devices.%22
TunerJNI: https://source.corp.google.com/android/frameworks/base/media/jni/android_media_tv_Tuner.cpp;l=926?q=android_media_tv_tuner
TunerResourceManager: https://source.corp.google.com/android/frameworks/base/media/java/android/media/tv/tunerresourcemanager/TunerResourceManager.java?q=tunerresourcemanager

SampleTunerTvInputService is an internal reference design of the privileged apps for vendors to refer
It runs on the virtual Android device Cuttlefish TV with the default Tuner HAL implementation

SampleTunerTvInputService: https://source.corp.google.com/android/packages/apps/TV/tuner/sampletunertvinput/

Test: Running SampleTunerTvInputService with LiveChannels on Cuttlefish to access Tuner HAL

$adb shell ps -Z | grep sampletunertvinput
u:r:sample_tuner_tis_app:s0:c232,c259,c512,c768 system 3459 345 932208 110828 0              0 S com.android.tv.samples.sampletunertvinput

Bug: 158868205
Change-Id: I5d7bb49c9ad5ead4a4ea726afdb915c86433a9a9