Camera2ClientBase.h revision 7b82efe7a376c882f8f938e1c41b8311a8cdda4a 
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
22namespace android {
23
24class IMemory;
25
26class CameraService;
27
28template <typename TClientBase>
29class Camera2ClientBase :
30        public TClientBase,
31        public CameraDeviceBase::NotificationListener
32{
33public:
34    typedef typename TClientBase::TCamCallbacks TCamCallbacks;
35
36    /**
37     * Base binder interface (see ICamera/IProCameraUser for details)
38     */
39    virtual status_t      connect(const sp<TCamCallbacks>& callbacks);
40    virtual void          disconnect();
41
42    /**
43     * Interface used by CameraService
44     */
45
46    // TODO: too many params, move into a ClientArgs<T>
47    Camera2ClientBase(const sp<CameraService>& cameraService,
48                      const sp<TCamCallbacks>& remoteCallback,
49                      const String16& clientPackageName,
50                      int cameraId,
51                      int cameraFacing,
52                      int clientPid,
53                      uid_t clientUid,
54                      int servicePid);
55    virtual ~Camera2ClientBase();
56
57    virtual status_t      initialize(camera_module_t *module);
58    virtual status_t      dump(int fd, const Vector<String16>& args);
59
60    /**
61     * CameraDeviceBase::NotificationListener implementation
62     */
63
64    virtual void          notifyError(int errorCode, int arg1, int arg2);
65    virtual void          notifyShutter(int frameNumber, nsecs_t timestamp);
66    virtual void          notifyAutoFocus(uint8_t newState, int triggerId);
67    virtual void          notifyAutoExposure(uint8_t newState, int triggerId);
68    virtual void          notifyAutoWhitebalance(uint8_t newState,
69                                                 int triggerId);
70
71
72    int                   getCameraId() const;
73    const sp<CameraDeviceBase>&
74                          getCameraDevice();
75    const sp<CameraService>&
76                          getCameraService();
77
78    /**
79     * Interface used by independent components of CameraClient2Base.
80     */
81
82    // Simple class to ensure that access to TCamCallbacks is serialized
83    // by requiring mRemoteCallbackLock to be locked before access to
84    // mRemoteCallback is possible.
85    class SharedCameraCallbacks {
86      public:
87        class Lock {
88          public:
89            Lock(SharedCameraCallbacks &client);
90            ~Lock();
91            sp<TCamCallbacks> &mRemoteCallback;
92          private:
93            SharedCameraCallbacks &mSharedClient;
94        };
95        SharedCameraCallbacks(const sp<TCamCallbacks>& client);
96        SharedCameraCallbacks& operator=(const sp<TCamCallbacks>& client);
97        void clear();
98      private:
99        sp<TCamCallbacks> mRemoteCallback;
100        mutable Mutex mRemoteCallbackLock;
101    } mSharedCameraCallbacks;
102
103protected:
104
105    virtual sp<IBinder> asBinderWrapper() {
106        return IInterface::asBinder();
107    }
108
109    virtual status_t      dumpDevice(int fd, const Vector<String16>& args);
110
111    /** Binder client interface-related private members */
112
113    // Mutex that must be locked by methods implementing the binder client
114    // interface. Ensures serialization between incoming client calls.
115    // All methods in this class hierarchy that append 'L' to the name assume
116    // that mBinderSerializationLock is locked when they're called
117    mutable Mutex         mBinderSerializationLock;
118
119    /** CameraDeviceBase instance wrapping HAL2+ entry */
120
121    sp<CameraDeviceBase>  mDevice;
122
123    /** Utility members */
124
125    // Verify that caller is the owner of the camera
126    status_t              checkPid(const char *checkLocation) const;
127
128    virtual void          detachDevice();
129};
130
131}; // namespace android
132
133#endif
134