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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 "common/CameraModule.h"
     22 #include "camera/CaptureResult.h"
     23 
     24 namespace android {
     25 
     26 class IMemory;
     27 
     28 class CameraService;
     29 
     30 template <typename TClientBase>
     31 class Camera2ClientBase :
     32         public TClientBase,
     33         public CameraDeviceBase::NotificationListener
     34 {
     35 public:
     36     typedef typename TClientBase::TCamCallbacks TCamCallbacks;
     37 
     38     /**
     39      * Base binder interface (see ICamera/ICameraDeviceUser for details)
     40      */
     41     virtual status_t      connect(const sp<TCamCallbacks>& callbacks);
     42     virtual void          disconnect();
     43 
     44     /**
     45      * Interface used by CameraService
     46      */
     47 
     48     // TODO: too many params, move into a ClientArgs<T>
     49     Camera2ClientBase(const sp<CameraService>& cameraService,
     50                       const sp<TCamCallbacks>& remoteCallback,
     51                       const String16& clientPackageName,
     52                       int cameraId,
     53                       int cameraFacing,
     54                       int clientPid,
     55                       uid_t clientUid,
     56                       int servicePid);
     57     virtual ~Camera2ClientBase();
     58 
     59     virtual status_t      initialize(CameraModule *module);
     60     virtual status_t      dump(int fd, const Vector<String16>& args);
     61 
     62     /**
     63      * CameraDeviceBase::NotificationListener implementation
     64      */
     65 
     66     virtual void          notifyError(ICameraDeviceCallbacks::CameraErrorCode errorCode,
     67                                       const CaptureResultExtras& resultExtras);
     68     virtual void          notifyIdle();
     69     virtual void          notifyShutter(const CaptureResultExtras& resultExtras,
     70                                         nsecs_t timestamp);
     71     virtual void          notifyAutoFocus(uint8_t newState, int triggerId);
     72     virtual void          notifyAutoExposure(uint8_t newState, int triggerId);
     73     virtual void          notifyAutoWhitebalance(uint8_t newState,
     74                                                  int triggerId);
     75     virtual void          notifyPrepared(int streamId);
     76 
     77     int                   getCameraId() const;
     78     const sp<CameraDeviceBase>&
     79                           getCameraDevice();
     80     int                   getCameraDeviceVersion() const;
     81     const sp<CameraService>&
     82                           getCameraService();
     83 
     84     /**
     85      * Interface used by independent components of CameraClient2Base.
     86      */
     87 
     88     // Simple class to ensure that access to TCamCallbacks is serialized
     89     // by requiring mRemoteCallbackLock to be locked before access to
     90     // mRemoteCallback is possible.
     91     class SharedCameraCallbacks {
     92       public:
     93         class Lock {
     94           public:
     95             Lock(SharedCameraCallbacks &client);
     96             ~Lock();
     97             sp<TCamCallbacks> &mRemoteCallback;
     98           private:
     99             SharedCameraCallbacks &mSharedClient;
    100         };
    101         SharedCameraCallbacks(const sp<TCamCallbacks>& client);
    102         SharedCameraCallbacks& operator=(const sp<TCamCallbacks>& client);
    103         void clear();
    104       private:
    105         sp<TCamCallbacks> mRemoteCallback;
    106         mutable Mutex mRemoteCallbackLock;
    107     } mSharedCameraCallbacks;
    108 
    109 protected:
    110 
    111     // The PID provided in the constructor call
    112     pid_t mInitialClientPid;
    113 
    114     virtual sp<IBinder> asBinderWrapper() {
    115         return IInterface::asBinder(this);
    116     }
    117 
    118     virtual status_t      dumpDevice(int fd, const Vector<String16>& args);
    119 
    120     /** Binder client interface-related private members */
    121 
    122     // Mutex that must be locked by methods implementing the binder client
    123     // interface. Ensures serialization between incoming client calls.
    124     // All methods in this class hierarchy that append 'L' to the name assume
    125     // that mBinderSerializationLock is locked when they're called
    126     mutable Mutex         mBinderSerializationLock;
    127 
    128     /** CameraDeviceBase instance wrapping HAL2+ entry */
    129 
    130     const int mDeviceVersion;
    131     sp<CameraDeviceBase>  mDevice;
    132 
    133     /** Utility members */
    134 
    135     // Verify that caller is the owner of the camera
    136     status_t              checkPid(const char *checkLocation) const;
    137 
    138     virtual void          detachDevice();
    139 };
    140 
    141 }; // namespace android
    142 
    143 #endif
    144