CameraService.h revision 60a78ac9535878984b0777788760b9ee7465c5e6 
1/*
2**
3** Copyright (C) 2008, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18#ifndef ANDROID_SERVERS_CAMERA_CAMERASERVICE_H
19#define ANDROID_SERVERS_CAMERA_CAMERASERVICE_H
20
21#include <binder/BinderService.h>
22#include <camera/ICameraService.h>
23#include <hardware/camera.h>
24
25/* This needs to be increased if we can have more cameras */
26#define MAX_CAMERAS 2
27
28namespace android {
29
30class MemoryHeapBase;
31class MediaPlayer;
32class CameraHardwareInterface;
33
34class CameraService :
35    public BinderService<CameraService>,
36    public BnCameraService
37{
38    class Client;
39    friend class BinderService<CameraService>;
40public:
41    static char const* getServiceName() { return "media.camera"; }
42
43                        CameraService();
44    virtual             ~CameraService();
45
46    virtual int32_t     getNumberOfCameras();
47    virtual status_t    getCameraInfo(int cameraId,
48                                      struct CameraInfo* cameraInfo);
49    virtual sp<ICamera> connect(const sp<ICameraClient>& cameraClient, int cameraId);
50    virtual void        removeClient(const sp<ICameraClient>& cameraClient);
51    virtual sp<Client>  getClientById(int cameraId);
52
53    virtual status_t    dump(int fd, const Vector<String16>& args);
54    virtual status_t    onTransact(uint32_t code, const Parcel& data,
55                                   Parcel* reply, uint32_t flags);
56    virtual void onFirstRef();
57
58    enum sound_kind {
59        SOUND_SHUTTER = 0,
60        SOUND_RECORDING = 1,
61        NUM_SOUNDS
62    };
63
64    void                loadSound();
65    void                playSound(sound_kind kind);
66    void                releaseSound();
67
68private:
69    Mutex               mServiceLock;
70    wp<Client>          mClient[MAX_CAMERAS];  // protected by mServiceLock
71    int                 mNumberOfCameras;
72
73    // atomics to record whether the hardware is allocated to some client.
74    volatile int32_t    mBusy[MAX_CAMERAS];
75    void                setCameraBusy(int cameraId);
76    void                setCameraFree(int cameraId);
77
78    // sounds
79    MediaPlayer*        newMediaPlayer(const char *file);
80
81    Mutex               mSoundLock;
82    sp<MediaPlayer>     mSoundPlayer[NUM_SOUNDS];
83    int                 mSoundRef;  // reference count (release all MediaPlayer when 0)
84
85    class Client : public BnCamera
86    {
87    public:
88        // ICamera interface (see ICamera for details)
89        virtual void            disconnect();
90        virtual status_t        connect(const sp<ICameraClient>& client);
91        virtual status_t        lock();
92        virtual status_t        unlock();
93        virtual status_t        setPreviewDisplay(const sp<Surface>& surface);
94        virtual status_t        setPreviewTexture(const sp<ISurfaceTexture>& surfaceTexture);
95        virtual void            setPreviewCallbackFlag(int flag);
96        virtual status_t        startPreview();
97        virtual void            stopPreview();
98        virtual bool            previewEnabled();
99        virtual status_t        storeMetaDataInBuffers(bool enabled);
100        virtual status_t        startRecording();
101        virtual void            stopRecording();
102        virtual bool            recordingEnabled();
103        virtual void            releaseRecordingFrame(const sp<IMemory>& mem);
104        virtual status_t        autoFocus();
105        virtual status_t        cancelAutoFocus();
106        virtual status_t        takePicture(int msgType);
107        virtual status_t        setParameters(const String8& params);
108        virtual String8         getParameters() const;
109        virtual status_t        sendCommand(int32_t cmd, int32_t arg1, int32_t arg2);
110    private:
111        friend class CameraService;
112                                Client(const sp<CameraService>& cameraService,
113                                       const sp<ICameraClient>& cameraClient,
114                                       const sp<CameraHardwareInterface>& hardware,
115                                       int cameraId,
116                                       int cameraFacing,
117                                       int clientPid);
118                                ~Client();
119
120        // return our camera client
121        const sp<ICameraClient>&    getCameraClient() { return mCameraClient; }
122
123        // check whether the calling process matches mClientPid.
124        status_t                checkPid() const;
125        status_t                checkPidAndHardware() const;  // also check mHardware != 0
126
127        // these are internal functions used to set up preview buffers
128        status_t                registerPreviewBuffers();
129
130        // camera operation mode
131        enum camera_mode {
132            CAMERA_PREVIEW_MODE   = 0,  // frame automatically released
133            CAMERA_RECORDING_MODE = 1,  // frame has to be explicitly released by releaseRecordingFrame()
134        };
135        // these are internal functions used for preview/recording
136        status_t                startCameraMode(camera_mode mode);
137        status_t                startPreviewMode();
138        status_t                startRecordingMode();
139
140        // internal function used by sendCommand to enable/disable shutter sound.
141        status_t                enableShutterSound(bool enable);
142
143        // these are static callback functions
144        static void             notifyCallback(int32_t msgType, int32_t ext1, int32_t ext2, void* user);
145        static void             dataCallback(int32_t msgType, const sp<IMemory>& dataPtr,
146                                             camera_frame_metadata_t *metadata, void* user);
147        static void             dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr, void* user);
148        // convert client from cookie
149        static sp<Client>       getClientFromCookie(void* user);
150        // handlers for messages
151        void                    handleShutter(void);
152        void                    handlePreviewData(int32_t msgType, const sp<IMemory>& mem,
153                                                  camera_frame_metadata_t *metadata);
154        void                    handlePostview(const sp<IMemory>& mem);
155        void                    handleRawPicture(const sp<IMemory>& mem);
156        void                    handleCompressedPicture(const sp<IMemory>& mem);
157        void                    handleGenericNotify(int32_t msgType, int32_t ext1, int32_t ext2);
158        void                    handleGenericData(int32_t msgType, const sp<IMemory>& dataPtr,
159                                                  camera_frame_metadata_t *metadata);
160        void                    handleGenericDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr);
161
162        void                    copyFrameAndPostCopiedFrame(
163                                    int32_t msgType,
164                                    const sp<ICameraClient>& client,
165                                    const sp<IMemoryHeap>& heap,
166                                    size_t offset, size_t size,
167                                    camera_frame_metadata_t *metadata);
168
169        int                     getOrientation(int orientation, bool mirror);
170
171        status_t                setPreviewWindow(
172                                    const sp<IBinder>& binder,
173                                    const sp<ANativeWindow>& window);
174
175        // these are initialized in the constructor.
176        sp<CameraService>               mCameraService;  // immutable after constructor
177        sp<ICameraClient>               mCameraClient;
178        int                             mCameraId;       // immutable after constructor
179        int                             mCameraFacing;   // immutable after constructor
180        pid_t                           mClientPid;
181        sp<CameraHardwareInterface>     mHardware;       // cleared after disconnect()
182        int                             mPreviewCallbackFlag;
183        int                             mOrientation;     // Current display orientation
184        bool                            mPlayShutterSound;
185
186        // Ensures atomicity among the public methods
187        mutable Mutex                   mLock;
188        // This is a binder of Surface or SurfaceTexture.
189        sp<IBinder>                     mSurface;
190        sp<ANativeWindow>               mPreviewWindow;
191
192        // If the user want us to return a copy of the preview frame (instead
193        // of the original one), we allocate mPreviewBuffer and reuse it if possible.
194        sp<MemoryHeapBase>              mPreviewBuffer;
195
196        // We need to avoid the deadlock when the incoming command thread and
197        // the CameraHardwareInterface callback thread both want to grab mLock.
198        // An extra flag is used to tell the callback thread that it should stop
199        // trying to deliver the callback messages if the client is not
200        // interested in it anymore. For example, if the client is calling
201        // stopPreview(), the preview frame messages do not need to be delivered
202        // anymore.
203
204        // This function takes the same parameter as the enableMsgType() and
205        // disableMsgType() functions in CameraHardwareInterface.
206        void                    enableMsgType(int32_t msgType);
207        void                    disableMsgType(int32_t msgType);
208        volatile int32_t        mMsgEnabled;
209
210        // This function keeps trying to grab mLock, or give up if the message
211        // is found to be disabled. It returns true if mLock is grabbed.
212        bool                    lockIfMessageWanted(int32_t msgType);
213    };
214
215    camera_module_t *mModule;
216};
217
218} // namespace android
219
220#endif
221