CameraService.h revision 03dfce9672b36c1a334959a602f909b8410bec50
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 // Used by Client objects to extract the ISurface from a Surface object. 83 // This is used because making Client a friend class of Surface would 84 // require including this header in Surface.h since Client is a nested 85 // class. 86 static sp<ISurface> getISurface(const sp<Surface>& surface); 87 88 class Client : public BnCamera 89 { 90 public: 91 // ICamera interface (see ICamera for details) 92 virtual void disconnect(); 93 virtual status_t connect(const sp<ICameraClient>& client); 94 virtual status_t lock(); 95 virtual status_t unlock(); 96 virtual status_t setPreviewDisplay(const sp<Surface>& surface); 97 virtual void setPreviewCallbackFlag(int flag); 98 virtual status_t startPreview(); 99 virtual void stopPreview(); 100 virtual bool previewEnabled(); 101 virtual int32_t getNumberOfVideoBuffers() const; 102 virtual sp<IMemory> getVideoBuffer(int32_t index) const; 103 virtual status_t storeMetaDataInBuffers(bool enabled); 104 virtual status_t startRecording(); 105 virtual void stopRecording(); 106 virtual bool recordingEnabled(); 107 virtual void releaseRecordingFrame(const sp<IMemory>& mem); 108 virtual status_t autoFocus(); 109 virtual status_t cancelAutoFocus(); 110 virtual status_t takePicture(); 111 virtual status_t setParameters(const String8& params); 112 virtual String8 getParameters() const; 113 virtual status_t sendCommand(int32_t cmd, int32_t arg1, int32_t arg2); 114 private: 115 friend class CameraService; 116 Client(const sp<CameraService>& cameraService, 117 const sp<ICameraClient>& cameraClient, 118 const sp<CameraHardwareInterface>& hardware, 119 int cameraId, 120 int cameraFacing, 121 int clientPid); 122 ~Client(); 123 124 // return our camera client 125 const sp<ICameraClient>& getCameraClient() { return mCameraClient; } 126 127 // check whether the calling process matches mClientPid. 128 status_t checkPid() const; 129 status_t checkPidAndHardware() const; // also check mHardware != 0 130 131 // these are internal functions used to set up preview buffers 132 status_t registerPreviewBuffers(); 133 134 // camera operation mode 135 enum camera_mode { 136 CAMERA_PREVIEW_MODE = 0, // frame automatically released 137 CAMERA_RECORDING_MODE = 1, // frame has to be explicitly released by releaseRecordingFrame() 138 }; 139 // these are internal functions used for preview/recording 140 status_t startCameraMode(camera_mode mode); 141 status_t startPreviewMode(); 142 status_t startRecordingMode(); 143 144 // internal function used by sendCommand to enable/disable shutter sound. 145 status_t enableShutterSound(bool enable); 146 147 // these are static callback functions 148 static void notifyCallback(int32_t msgType, int32_t ext1, int32_t ext2, void* user); 149 static void dataCallback(int32_t msgType, const sp<IMemory>& dataPtr, void* user); 150 static void dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr, void* user); 151 // convert client from cookie 152 static sp<Client> getClientFromCookie(void* user); 153 // handlers for messages 154 void handleShutter(image_rect_type *size); 155 void handlePreviewData(const sp<IMemory>& mem); 156 void handlePostview(const sp<IMemory>& mem); 157 void handleRawPicture(const sp<IMemory>& mem); 158 void handleCompressedPicture(const sp<IMemory>& mem); 159 void handleGenericNotify(int32_t msgType, int32_t ext1, int32_t ext2); 160 void handleGenericData(int32_t msgType, const sp<IMemory>& dataPtr); 161 void handleGenericDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr); 162 163 void copyFrameAndPostCopiedFrame( 164 const sp<ICameraClient>& client, 165 const sp<IMemoryHeap>& heap, 166 size_t offset, size_t size); 167 168 int getOrientation(int orientation, bool mirror); 169 170 // these are initialized in the constructor. 171 sp<CameraService> mCameraService; // immutable after constructor 172 sp<ICameraClient> mCameraClient; 173 int mCameraId; // immutable after constructor 174 int mCameraFacing; // immutable after constructor 175 pid_t mClientPid; 176 sp<CameraHardwareInterface> mHardware; // cleared after disconnect() 177 int mPreviewCallbackFlag; 178 int mOrientation; // Current display orientation 179 bool mPlayShutterSound; 180 181 // Ensures atomicity among the public methods 182 mutable Mutex mLock; 183 sp<ISurface> mSurface; 184 sp<ANativeWindow> mPreviewWindow; 185 186 // If the user want us to return a copy of the preview frame (instead 187 // of the original one), we allocate mPreviewBuffer and reuse it if possible. 188 sp<MemoryHeapBase> mPreviewBuffer; 189 190 // We need to avoid the deadlock when the incoming command thread and 191 // the CameraHardwareInterface callback thread both want to grab mLock. 192 // An extra flag is used to tell the callback thread that it should stop 193 // trying to deliver the callback messages if the client is not 194 // interested in it anymore. For example, if the client is calling 195 // stopPreview(), the preview frame messages do not need to be delivered 196 // anymore. 197 198 // This function takes the same parameter as the enableMsgType() and 199 // disableMsgType() functions in CameraHardwareInterface. 200 void enableMsgType(int32_t msgType); 201 void disableMsgType(int32_t msgType); 202 volatile int32_t mMsgEnabled; 203 204 // This function keeps trying to grab mLock, or give up if the message 205 // is found to be disabled. It returns true if mLock is grabbed. 206 bool lockIfMessageWanted(int32_t msgType); 207 }; 208}; 209 210} // namespace android 211 212#endif 213