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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ANDROID_SERVERS_CAMERA_CAMERA2CLIENT_BASE_H
     18 #define ANDROID_SERVERS_CAMERA_CAMERA2CLIENT_BASE_H
     19 
     20 #include "common/CameraDeviceBase.h"
     21 #include "camera/CaptureResult.h"
     22 
     23 namespace android {
     24 
     25 class IMemory;
     26 
     27 class CameraService;
     28 
     29 template <typename TClientBase>
     30 class Camera2ClientBase :
     31         public TClientBase,
     32         public CameraDeviceBase::NotificationListener
     33 {
     34 public:
     35     typedef typename TClientBase::TCamCallbacks TCamCallbacks;
     36 
     37     /**
     38      * Base binder interface (see ICamera/IProCameraUser for details)
     39      */
     40     virtual status_t      connect(const sp<TCamCallbacks>& callbacks);
     41     virtual void          disconnect();
     42 
     43     /**
     44      * Interface used by CameraService
     45      */
     46 
     47     // TODO: too many params, move into a ClientArgs<T>
     48     Camera2ClientBase(const sp<CameraService>& cameraService,
     49                       const sp<TCamCallbacks>& remoteCallback,
     50                       const String16& clientPackageName,
     51                       int cameraId,
     52                       int cameraFacing,
     53                       int clientPid,
     54                       uid_t clientUid,
     55                       int servicePid);
     56     virtual ~Camera2ClientBase();
     57 
     58     virtual status_t      initialize(camera_module_t *module);
     59     virtual status_t      dump(int fd, const Vector<String16>& args);
     60 
     61     /**
     62      * CameraDeviceBase::NotificationListener implementation
     63      */
     64 
     65     virtual void          notifyError(ICameraDeviceCallbacks::CameraErrorCode errorCode,
     66                                       const CaptureResultExtras& resultExtras);
     67     virtual void          notifyIdle();
     68     virtual void          notifyShutter(const CaptureResultExtras& resultExtras,
     69                                         nsecs_t timestamp);
     70     virtual void          notifyAutoFocus(uint8_t newState, int triggerId);
     71     virtual void          notifyAutoExposure(uint8_t newState, int triggerId);
     72     virtual void          notifyAutoWhitebalance(uint8_t newState,
     73                                                  int triggerId);
     74 
     75 
     76     int                   getCameraId() const;
     77     const sp<CameraDeviceBase>&
     78                           getCameraDevice();
     79     int                   getCameraDeviceVersion() const;
     80     const sp<CameraService>&
     81                           getCameraService();
     82 
     83     /**
     84      * Interface used by independent components of CameraClient2Base.
     85      */
     86 
     87     // Simple class to ensure that access to TCamCallbacks is serialized
     88     // by requiring mRemoteCallbackLock to be locked before access to
     89     // mRemoteCallback is possible.
     90     class SharedCameraCallbacks {
     91       public:
     92         class Lock {
     93           public:
     94             Lock(SharedCameraCallbacks &client);
     95             ~Lock();
     96             sp<TCamCallbacks> &mRemoteCallback;
     97           private:
     98             SharedCameraCallbacks &mSharedClient;
     99         };
    100         SharedCameraCallbacks(const sp<TCamCallbacks>& client);
    101         SharedCameraCallbacks& operator=(const sp<TCamCallbacks>& client);
    102         void clear();
    103       private:
    104         sp<TCamCallbacks> mRemoteCallback;
    105         mutable Mutex mRemoteCallbackLock;
    106     } mSharedCameraCallbacks;
    107 
    108 protected:
    109 
    110     // The PID provided in the constructor call
    111     pid_t mInitialClientPid;
    112 
    113     virtual sp<IBinder> asBinderWrapper() {
    114         return IInterface::asBinder();
    115     }
    116 
    117     virtual status_t      dumpDevice(int fd, const Vector<String16>& args);
    118 
    119     /** Binder client interface-related private members */
    120 
    121     // Mutex that must be locked by methods implementing the binder client
    122     // interface. Ensures serialization between incoming client calls.
    123     // All methods in this class hierarchy that append 'L' to the name assume
    124     // that mBinderSerializationLock is locked when they're called
    125     mutable Mutex         mBinderSerializationLock;
    126 
    127     /** CameraDeviceBase instance wrapping HAL2+ entry */
    128 
    129     const int mDeviceVersion;
    130     sp<CameraDeviceBase>  mDevice;
    131 
    132     /** Utility members */
    133 
    134     // Verify that caller is the owner of the camera
    135     status_t              checkPid(const char *checkLocation) const;
    136 
    137     virtual void          detachDevice();
    138 };
    139 
    140 }; // namespace android
    141 
    142 #endif
    143