Camera2ClientBase.h revision cd8fce8fbe0f515e53a0ea0f50b739cf42ee57a4 
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
23namespace android {
24
25class IMemory;
26
27class CameraService;
28
29template <typename TClientBase>
30class Camera2ClientBase :
31        public TClientBase,
32        public CameraDeviceBase::NotificationListener
33{
34public:
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
108protected:
109
110    virtual sp<IBinder> asBinderWrapper() {
111        return IInterface::asBinder();
112    }
113
114    virtual status_t      dumpDevice(int fd, const Vector<String16>& args);
115
116    /** Binder client interface-related private members */
117
118    // Mutex that must be locked by methods implementing the binder client
119    // interface. Ensures serialization between incoming client calls.
120    // All methods in this class hierarchy that append 'L' to the name assume
121    // that mBinderSerializationLock is locked when they're called
122    mutable Mutex         mBinderSerializationLock;
123
124    /** CameraDeviceBase instance wrapping HAL2+ entry */
125
126    const int mDeviceVersion;
127    sp<CameraDeviceBase>  mDevice;
128
129    /** Utility members */
130
131    // Verify that caller is the owner of the camera
132    status_t              checkPid(const char *checkLocation) const;
133
134    virtual void          detachDevice();
135};
136
137}; // namespace android
138
139#endif
140