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 28 namespace android { 29 30 class MemoryHeapBase; 31 class MediaPlayer; 32 class CameraHardwareInterface; 33 34 class CameraService : 35 public BinderService<CameraService>, 36 public BnCameraService 37 { 38 class Client; 39 friend class BinderService<CameraService>; 40 public: 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 68 private: 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 audio_stream_type_t mAudioStreamType; 80 MediaPlayer* newMediaPlayer(const char *file); 81 82 Mutex mSoundLock; 83 sp<MediaPlayer> mSoundPlayer[NUM_SOUNDS]; 84 int mSoundRef; // reference count (release all MediaPlayer when 0) 85 86 class Client : public BnCamera 87 { 88 public: 89 // ICamera interface (see ICamera for details) 90 virtual void disconnect(); 91 virtual status_t connect(const sp<ICameraClient>& client); 92 virtual status_t lock(); 93 virtual status_t unlock(); 94 virtual status_t setPreviewDisplay(const sp<Surface>& surface); 95 virtual status_t setPreviewTexture(const sp<ISurfaceTexture>& surfaceTexture); 96 virtual void setPreviewCallbackFlag(int flag); 97 virtual status_t startPreview(); 98 virtual void stopPreview(); 99 virtual bool previewEnabled(); 100 virtual status_t storeMetaDataInBuffers(bool enabled); 101 virtual status_t startRecording(); 102 virtual void stopRecording(); 103 virtual bool recordingEnabled(); 104 virtual void releaseRecordingFrame(const sp<IMemory>& mem); 105 virtual status_t autoFocus(); 106 virtual status_t cancelAutoFocus(); 107 virtual status_t takePicture(int msgType); 108 virtual status_t setParameters(const String8& params); 109 virtual String8 getParameters() const; 110 virtual status_t sendCommand(int32_t cmd, int32_t arg1, int32_t arg2); 111 private: 112 friend class CameraService; 113 Client(const sp<CameraService>& cameraService, 114 const sp<ICameraClient>& cameraClient, 115 const sp<CameraHardwareInterface>& hardware, 116 int cameraId, 117 int cameraFacing, 118 int clientPid); 119 ~Client(); 120 121 // return our camera client 122 const sp<ICameraClient>& getCameraClient() { return mCameraClient; } 123 124 // check whether the calling process matches mClientPid. 125 status_t checkPid() const; 126 status_t checkPidAndHardware() const; // also check mHardware != 0 127 128 // these are internal functions used to set up preview buffers 129 status_t registerPreviewBuffers(); 130 131 // camera operation mode 132 enum camera_mode { 133 CAMERA_PREVIEW_MODE = 0, // frame automatically released 134 CAMERA_RECORDING_MODE = 1, // frame has to be explicitly released by releaseRecordingFrame() 135 }; 136 // these are internal functions used for preview/recording 137 status_t startCameraMode(camera_mode mode); 138 status_t startPreviewMode(); 139 status_t startRecordingMode(); 140 141 // internal function used by sendCommand to enable/disable shutter sound. 142 status_t enableShutterSound(bool enable); 143 144 // these are static callback functions 145 static void notifyCallback(int32_t msgType, int32_t ext1, int32_t ext2, void* user); 146 static void dataCallback(int32_t msgType, const sp<IMemory>& dataPtr, 147 camera_frame_metadata_t *metadata, void* user); 148 static void dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr, void* user); 149 // convert client from cookie 150 static sp<Client> getClientFromCookie(void* user); 151 // handlers for messages 152 void handleShutter(void); 153 void handlePreviewData(int32_t msgType, const sp<IMemory>& mem, 154 camera_frame_metadata_t *metadata); 155 void handlePostview(const sp<IMemory>& mem); 156 void handleRawPicture(const sp<IMemory>& mem); 157 void handleCompressedPicture(const sp<IMemory>& mem); 158 void handleGenericNotify(int32_t msgType, int32_t ext1, int32_t ext2); 159 void handleGenericData(int32_t msgType, const sp<IMemory>& dataPtr, 160 camera_frame_metadata_t *metadata); 161 void handleGenericDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr); 162 163 void copyFrameAndPostCopiedFrame( 164 int32_t msgType, 165 const sp<ICameraClient>& client, 166 const sp<IMemoryHeap>& heap, 167 size_t offset, size_t size, 168 camera_frame_metadata_t *metadata); 169 170 int getOrientation(int orientation, bool mirror); 171 172 status_t setPreviewWindow( 173 const sp<IBinder>& binder, 174 const sp<ANativeWindow>& window); 175 176 // these are initialized in the constructor. 177 sp<CameraService> mCameraService; // immutable after constructor 178 sp<ICameraClient> mCameraClient; 179 int mCameraId; // immutable after constructor 180 int mCameraFacing; // immutable after constructor 181 pid_t mClientPid; 182 sp<CameraHardwareInterface> mHardware; // cleared after disconnect() 183 int mPreviewCallbackFlag; 184 int mOrientation; // Current display orientation 185 bool mPlayShutterSound; 186 187 // Ensures atomicity among the public methods 188 mutable Mutex mLock; 189 // This is a binder of Surface or SurfaceTexture. 190 sp<IBinder> mSurface; 191 sp<ANativeWindow> mPreviewWindow; 192 193 // If the user want us to return a copy of the preview frame (instead 194 // of the original one), we allocate mPreviewBuffer and reuse it if possible. 195 sp<MemoryHeapBase> mPreviewBuffer; 196 197 // We need to avoid the deadlock when the incoming command thread and 198 // the CameraHardwareInterface callback thread both want to grab mLock. 199 // An extra flag is used to tell the callback thread that it should stop 200 // trying to deliver the callback messages if the client is not 201 // interested in it anymore. For example, if the client is calling 202 // stopPreview(), the preview frame messages do not need to be delivered 203 // anymore. 204 205 // This function takes the same parameter as the enableMsgType() and 206 // disableMsgType() functions in CameraHardwareInterface. 207 void enableMsgType(int32_t msgType); 208 void disableMsgType(int32_t msgType); 209 volatile int32_t mMsgEnabled; 210 211 // This function keeps trying to grab mLock, or give up if the message 212 // is found to be disabled. It returns true if mLock is grabbed. 213 bool lockIfMessageWanted(int32_t msgType); 214 }; 215 216 camera_module_t *mModule; 217 }; 218 219 } // namespace android 220 221 #endif 222
