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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 "CameraDeviceBase.h"
     21 #include "CameraService.h"
     22 
     23 namespace android {
     24 
     25 class IMemory;
     26 
     27 template <typename TClientBase>
     28 class Camera2ClientBase :
     29         public TClientBase,
     30         public CameraDeviceBase::NotificationListener
     31 {
     32 public:
     33     typedef typename TClientBase::TCamCallbacks TCamCallbacks;
     34 
     35     /**
     36      * Base binder interface (see ICamera/IProCameraUser for details)
     37      */
     38     virtual status_t      connect(const sp<TCamCallbacks>& callbacks);
     39     virtual void          disconnect();
     40 
     41     /**
     42      * Interface used by CameraService
     43      */
     44 
     45     // TODO: too many params, move into a ClientArgs<T>
     46     Camera2ClientBase(const sp<CameraService>& cameraService,
     47                       const sp<TCamCallbacks>& remoteCallback,
     48                       const String16& clientPackageName,
     49                       int cameraId,
     50                       int cameraFacing,
     51                       int clientPid,
     52                       uid_t clientUid,
     53                       int servicePid);
     54     virtual ~Camera2ClientBase();
     55 
     56     virtual status_t      initialize(camera_module_t *module);
     57     virtual status_t      dump(int fd, const Vector<String16>& args);
     58 
     59     /**
     60      * CameraDeviceBase::NotificationListener implementation
     61      */
     62 
     63     virtual void          notifyError(int errorCode, int arg1, int arg2);
     64     virtual void          notifyShutter(int frameNumber, nsecs_t timestamp);
     65     virtual void          notifyAutoFocus(uint8_t newState, int triggerId);
     66     virtual void          notifyAutoExposure(uint8_t newState, int triggerId);
     67     virtual void          notifyAutoWhitebalance(uint8_t newState,
     68                                                  int triggerId);
     69 
     70 
     71     int                   getCameraId() const;
     72     const sp<CameraDeviceBase>&
     73                           getCameraDevice();
     74     const sp<CameraService>&
     75                           getCameraService();
     76 
     77     /**
     78      * Interface used by independent components of CameraClient2Base.
     79      */
     80 
     81     // Simple class to ensure that access to TCamCallbacks is serialized
     82     // by requiring mRemoteCallbackLock to be locked before access to
     83     // mRemoteCallback is possible.
     84     class SharedCameraCallbacks {
     85       public:
     86         class Lock {
     87           public:
     88             Lock(SharedCameraCallbacks &client);
     89             ~Lock();
     90             sp<TCamCallbacks> &mRemoteCallback;
     91           private:
     92             SharedCameraCallbacks &mSharedClient;
     93         };
     94         SharedCameraCallbacks(const sp<TCamCallbacks>& client);
     95         SharedCameraCallbacks& operator=(const sp<TCamCallbacks>& client);
     96         void clear();
     97       private:
     98         sp<TCamCallbacks> mRemoteCallback;
     99         mutable Mutex mRemoteCallbackLock;
    100     } mSharedCameraCallbacks;
    101 
    102 protected:
    103 
    104     virtual status_t      dumpDevice(int fd, const Vector<String16>& args);
    105 
    106     /** Binder client interface-related private members */
    107 
    108     // Mutex that must be locked by methods implementing the binder client
    109     // interface. Ensures serialization between incoming client calls.
    110     // All methods in this class hierarchy that append 'L' to the name assume
    111     // that mBinderSerializationLock is locked when they're called
    112     mutable Mutex         mBinderSerializationLock;
    113 
    114     /** CameraDeviceBase instance wrapping HAL2+ entry */
    115 
    116     sp<CameraDeviceBase>  mDevice;
    117 
    118     /** Utility members */
    119 
    120     // Verify that caller is the owner of the camera
    121     status_t              checkPid(const char *checkLocation) const;
    122 
    123     virtual void          detachDevice();
    124 };
    125 
    126 }; // namespace android
    127 
    128 #endif
    129