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
23#include <camera/ICameraService.h>
24#include <camera/CameraHardwareInterface.h>
25
26/* This needs to be increased if we can have more cameras */
27#define MAX_CAMERAS 2
28
29namespace android {
30
31class MemoryHeapBase;
32class MediaPlayer;
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
57    enum sound_kind {
58        SOUND_SHUTTER = 0,
59        SOUND_RECORDING = 1,
60        NUM_SOUNDS
61    };
62
63    void                loadSound();
64    void                playSound(sound_kind kind);
65    void                releaseSound();
66
67private:
68    Mutex               mServiceLock;
69    wp<Client>          mClient[MAX_CAMERAS];  // protected by mServiceLock
70    int                 mNumberOfCameras;
71
72    // atomics to record whether the hardware is allocated to some client.
73    volatile int32_t    mBusy[MAX_CAMERAS];
74    void                setCameraBusy(int cameraId);
75    void                setCameraFree(int cameraId);
76
77    // sounds
78    Mutex               mSoundLock;
79    sp<MediaPlayer>     mSoundPlayer[NUM_SOUNDS];
80    int                 mSoundRef;  // reference count (release all MediaPlayer when 0)
81
82    class Client : public BnCamera
83    {
84    public:
85        // ICamera interface (see ICamera for details)
86        virtual void            disconnect();
87        virtual status_t        connect(const sp<ICameraClient>& client);
88        virtual status_t        lock();
89        virtual status_t        unlock();
90        virtual status_t        setPreviewDisplay(const sp<ISurface>& surface);
91        virtual void            setPreviewCallbackFlag(int flag);
92        virtual status_t        startPreview();
93        virtual void            stopPreview();
94        virtual bool            previewEnabled();
95        virtual status_t        startRecording();
96        virtual void            stopRecording();
97        virtual bool            recordingEnabled();
98        virtual void            releaseRecordingFrame(const sp<IMemory>& mem);
99        virtual status_t        autoFocus();
100        virtual status_t        cancelAutoFocus();
101        virtual status_t        takePicture();
102        virtual status_t        setParameters(const String8& params);
103        virtual String8         getParameters() const;
104        virtual status_t        sendCommand(int32_t cmd, int32_t arg1, int32_t arg2);
105    private:
106        friend class CameraService;
107                                Client(const sp<CameraService>& cameraService,
108                                       const sp<ICameraClient>& cameraClient,
109                                       const sp<CameraHardwareInterface>& hardware,
110                                       int cameraId,
111                                       int cameraFacing,
112                                       int clientPid);
113                                ~Client();
114
115        // return our camera client
116        const sp<ICameraClient>&    getCameraClient() { return mCameraClient; }
117
118        // check whether the calling process matches mClientPid.
119        status_t                checkPid() const;
120        status_t                checkPidAndHardware() const;  // also check mHardware != 0
121
122        // these are internal functions used to set up preview buffers
123        status_t                registerPreviewBuffers();
124        status_t                setOverlay();
125
126        // camera operation mode
127        enum camera_mode {
128            CAMERA_PREVIEW_MODE   = 0,  // frame automatically released
129            CAMERA_RECORDING_MODE = 1,  // frame has to be explicitly released by releaseRecordingFrame()
130        };
131        // these are internal functions used for preview/recording
132        status_t                startCameraMode(camera_mode mode);
133        status_t                startPreviewMode();
134        status_t                startRecordingMode();
135
136        // these are static callback functions
137        static void             notifyCallback(int32_t msgType, int32_t ext1, int32_t ext2, void* user);
138        static void             dataCallback(int32_t msgType, const sp<IMemory>& dataPtr, void* user);
139        static void             dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr, void* user);
140        // convert client from cookie
141        static sp<Client>       getClientFromCookie(void* user);
142        // handlers for messages
143        void                    handleShutter(image_rect_type *size);
144        void                    handlePreviewData(const sp<IMemory>& mem);
145        void                    handlePostview(const sp<IMemory>& mem);
146        void                    handleRawPicture(const sp<IMemory>& mem);
147        void                    handleCompressedPicture(const sp<IMemory>& mem);
148        void                    handleGenericNotify(int32_t msgType, int32_t ext1, int32_t ext2);
149        void                    handleGenericData(int32_t msgType, const sp<IMemory>& dataPtr);
150        void                    handleGenericDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr);
151
152        void                    copyFrameAndPostCopiedFrame(
153                                    const sp<ICameraClient>& client,
154                                    const sp<IMemoryHeap>& heap,
155                                    size_t offset, size_t size);
156
157        int                     getOrientation(int orientation, bool mirror);
158
159        // these are initialized in the constructor.
160        sp<CameraService>               mCameraService;  // immutable after constructor
161        sp<ICameraClient>               mCameraClient;
162        int                             mCameraId;       // immutable after constructor
163        int                             mCameraFacing;   // immutable after constructor
164        pid_t                           mClientPid;
165        sp<CameraHardwareInterface>     mHardware;       // cleared after disconnect()
166        bool                            mUseOverlay;     // immutable after constructor
167        sp<OverlayRef>                  mOverlayRef;
168        int                             mOverlayW;
169        int                             mOverlayH;
170        int                             mPreviewCallbackFlag;
171        int                             mOrientation;     // Current display orientation
172        // True if display orientation has been changed. This is only used in overlay.
173        int                             mOrientationChanged;
174
175        // Ensures atomicity among the public methods
176        mutable Mutex                   mLock;
177        sp<ISurface>                    mSurface;
178
179        // If the user want us to return a copy of the preview frame (instead
180        // of the original one), we allocate mPreviewBuffer and reuse it if possible.
181        sp<MemoryHeapBase>              mPreviewBuffer;
182
183        // We need to avoid the deadlock when the incoming command thread and
184        // the CameraHardwareInterface callback thread both want to grab mLock.
185        // An extra flag is used to tell the callback thread that it should stop
186        // trying to deliver the callback messages if the client is not
187        // interested in it anymore. For example, if the client is calling
188        // stopPreview(), the preview frame messages do not need to be delivered
189        // anymore.
190
191        // This function takes the same parameter as the enableMsgType() and
192        // disableMsgType() functions in CameraHardwareInterface.
193        void                    enableMsgType(int32_t msgType);
194        void                    disableMsgType(int32_t msgType);
195        volatile int32_t        mMsgEnabled;
196
197        // This function keeps trying to grab mLock, or give up if the message
198        // is found to be disabled. It returns true if mLock is grabbed.
199        bool                    lockIfMessageWanted(int32_t msgType);
200    };
201};
202
203} // namespace android
204
205#endif
206