Clear buffer references when a video stream stops

When CarEvsCameraPreviewActivity requests to stop a video stream
currently in use, it may hold references of delivered frame buffers that
are already invalidated by EvsManager.  These invalid buffer references
could break a frame buffer circulation if CarEvsCameraPreviewActivity is
resumed.

This CL addresses this issue by dropping all buffer references when
handleVideoStreamLocked() decides to stop a current video stream.

Bug: 187407895
Bug: 188076578
Test: Launches the preview activity and turns on and off the display by
      injecting power keyevent (26).
Change-Id: I41edb718fe11933730f484605b8ad15cfce0a9dc
3 files changed
tree: 2747a7d03940038c905134e28d90cb186eac5460
  1. car-admin-ui-lib/
  2. car-internal-lib/
  3. car-lib/
  4. car-maps-placeholder/
  5. car-systemtest-lib/
  6. car-test-lib/
  7. car-usb-handler/
  8. car_product/
  9. cpp/
  10. data/
  11. experimental/
  12. FrameworkPackageStubs/
  13. obd2-lib/
  14. packages/
  15. procfs-inspector/
  16. service/
  17. tests/
  18. tools/
  19. user/
  20. vehicle-hal-support-lib/
  21. .clang-format
  22. .gitignore
  23. Android.mk
  24. CleanSpec.mk
  25. CPPLINT.cfg
  26. OWNERS
  27. PREUPLOAD.cfg
  28. README.md
  29. TEST_MAPPING
README.md

Native (C++) code format is required to be compatible with .clang-format file. Run

git clang-format --style=file --extension='h,cpp,cc' HEAD~

Note that clang-format is not desirable for Android java files. Therefore the command line above is limited to specific extensions.