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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/ICameraDeviceUser for details)
     39      */
     40     virtual status_t       connect(const sp<TCamCallbacks>& callbacks);
     41     virtual binder::Status 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                       const String8& cameraId,
     52                       int api1CameraId,
     53                       int cameraFacing,
     54                       int clientPid,
     55                       uid_t clientUid,
     56                       int servicePid);
     57     virtual ~Camera2ClientBase();
     58 
     59     virtual status_t      initialize(sp<CameraProviderManager> manager, const String8& monitorTags);
     60     virtual status_t      dumpClient(int fd, const Vector<String16>& args);
     61 
     62     /**
     63      * CameraDeviceBase::NotificationListener implementation
     64      */
     65 
     66     virtual void          notifyError(int32_t 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     virtual void          notifyRequestQueueEmpty();
     77     virtual void          notifyRepeatingRequestError(long lastFrameNumber);
     78 
     79     int                   getCameraId() const;
     80     const sp<CameraDeviceBase>&
     81                           getCameraDevice();
     82     int                   getCameraDeviceVersion() const;
     83     const sp<CameraService>&
     84                           getCameraService();
     85 
     86     /**
     87      * Interface used by independent components of CameraClient2Base.
     88      */
     89 
     90     // Simple class to ensure that access to TCamCallbacks is serialized
     91     // by requiring mRemoteCallbackLock to be locked before access to
     92     // mRemoteCallback is possible.
     93     class SharedCameraCallbacks {
     94       public:
     95         class Lock {
     96           public:
     97             explicit Lock(SharedCameraCallbacks &client);
     98             ~Lock();
     99             sp<TCamCallbacks> &mRemoteCallback;
    100           private:
    101             SharedCameraCallbacks &mSharedClient;
    102         };
    103         explicit SharedCameraCallbacks(const sp<TCamCallbacks>& client);
    104         SharedCameraCallbacks& operator=(const sp<TCamCallbacks>& client);
    105         void clear();
    106       private:
    107         sp<TCamCallbacks> mRemoteCallback;
    108         mutable Mutex mRemoteCallbackLock;
    109     } mSharedCameraCallbacks;
    110 
    111 protected:
    112 
    113     // The PID provided in the constructor call
    114     pid_t mInitialClientPid;
    115 
    116     virtual sp<IBinder> asBinderWrapper() {
    117         return IInterface::asBinder(this);
    118     }
    119 
    120     virtual status_t      dumpDevice(int fd, const Vector<String16>& args);
    121 
    122     /** Binder client interface-related private members */
    123 
    124     // Mutex that must be locked by methods implementing the binder client
    125     // interface. Ensures serialization between incoming client calls.
    126     // All methods in this class hierarchy that append 'L' to the name assume
    127     // that mBinderSerializationLock is locked when they're called
    128     mutable Mutex         mBinderSerializationLock;
    129 
    130     /** CameraDeviceBase instance wrapping HAL3+ entry */
    131 
    132     const int mDeviceVersion;
    133 
    134     // Set to const to avoid mDevice being updated (update of sp<> is racy) during
    135     // dumpDevice (which is important to be lock free for debugging purpose)
    136     const sp<CameraDeviceBase>  mDevice;
    137 
    138     /** Utility members */
    139 
    140     // Verify that caller is the owner of the camera
    141     status_t              checkPid(const char *checkLocation) const;
    142 
    143     virtual void          detachDevice();
    144 
    145     bool                  mDeviceActive;
    146 
    147     const int             mApi1CameraId; // -1 if client is API2
    148 
    149 private:
    150     template<typename TProviderPtr>
    151     status_t              initializeImpl(TProviderPtr providerPtr, const String8& monitorTags);
    152 };
    153 
    154 }; // namespace android
    155 
    156 #endif
    157