Add a new camera open API that allows taking the ownership.

The purpose is to let face unlock always get the camera
successfully. What happened was the camera applications may
have opened the camera in onResume under the lock screen.
This API lets face unlock take the camera from the camera
application. A new permission will be added, so other
applicatoins won't be able to take the camera from the face
unlock.

bug:5584464

Change-Id: Ib3d9dcbc2161815b68db42327dc01148453704c6

1 files changed, 13 insertions, 2 deletions

diff --git a/services/camera/libcameraservice/CameraService.h b/services/camera/libcameraservice/CameraService.h
index bad41f5..457c79b 100644
--- a/services/camera/libcameraservice/CameraService.h
+++ b/services/camera/libcameraservice/CameraService.h
@@ -46,7 +46,8 @@ public:
     virtual int32_t     getNumberOfCameras();
     virtual status_t    getCameraInfo(int cameraId,
                                       struct CameraInfo* cameraInfo);
-    virtual sp<ICamera> connect(const sp<ICameraClient>& cameraClient, int cameraId);
+    virtual sp<ICamera> connect(const sp<ICameraClient>& cameraClient, int cameraId,
+                                bool force, bool keep);
     virtual void        removeClient(const sp<ICameraClient>& cameraClient);
     virtual sp<Client>  getClientById(int cameraId);
 
@@ -114,7 +115,8 @@ private:
                                        const sp<CameraHardwareInterface>& hardware,
                                        int cameraId,
                                        int cameraFacing,
-                                       int clientPid);
+                                       int clientPid,
+                                       bool keep);
                                 ~Client();
 
         // return our camera client
@@ -172,12 +174,19 @@ private:
                                     const sp<IBinder>& binder,
                                     const sp<ANativeWindow>& window);
 
+        void                    disconnectInternal(bool needCheckPid);
+        bool                    keep() const;
+        void                    waitRelease(int ms);
+
+
         // these are initialized in the constructor.
         sp<CameraService>               mCameraService;  // immutable after constructor
         sp<ICameraClient>               mCameraClient;
         int                             mCameraId;       // immutable after constructor
         int                             mCameraFacing;   // immutable after constructor
         pid_t                           mClientPid;
+        // Client wants to keep the camera from taking by other clients.
+        bool                            mKeep;
         sp<CameraHardwareInterface>     mHardware;       // cleared after disconnect()
         int                             mPreviewCallbackFlag;
         int                             mOrientation;     // Current display orientation
@@ -185,6 +194,8 @@ private:
 
         // Ensures atomicity among the public methods
         mutable Mutex                   mLock;
+        // This will get notified when the hardware is released.
+        Condition                       mReleaseCondition;
         // This is a binder of Surface or SurfaceTexture.
         sp<IBinder>                     mSurface;
         sp<ANativeWindow>               mPreviewWindow;