CameraService.h revision 61ab9f93315ea817cd1ac110e2a95da4dab6b4d1
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 30extern volatile int32_t gLogLevel; 31 32class MemoryHeapBase; 33class MediaPlayer; 34 35class CameraService : 36 public BinderService<CameraService>, 37 public BnCameraService 38{ 39 friend class BinderService<CameraService>; 40public: 41 class Client; 42 static char const* getServiceName() { return "media.camera"; } 43 44 CameraService(); 45 virtual ~CameraService(); 46 47 virtual int32_t getNumberOfCameras(); 48 virtual status_t getCameraInfo(int cameraId, 49 struct CameraInfo* cameraInfo); 50 virtual sp<ICamera> connect(const sp<ICameraClient>& cameraClient, int cameraId); 51 virtual void removeClient(const sp<ICameraClient>& cameraClient); 52 // returns plain pointer of client. Note that mClientLock should be acquired to 53 // prevent the client from destruction. The result can be NULL. 54 virtual Client* getClientByIdUnsafe(int cameraId); 55 virtual Mutex* getClientLockById(int cameraId); 56 57 virtual status_t dump(int fd, const Vector<String16>& args); 58 virtual status_t onTransact(uint32_t code, const Parcel& data, 59 Parcel* reply, uint32_t flags); 60 virtual void onFirstRef(); 61 62 enum sound_kind { 63 SOUND_SHUTTER = 0, 64 SOUND_RECORDING = 1, 65 NUM_SOUNDS 66 }; 67 68 void loadSound(); 69 void playSound(sound_kind kind); 70 void releaseSound(); 71 72 class Client : public BnCamera 73 { 74 public: 75 // ICamera interface (see ICamera for details) 76 virtual void disconnect(); 77 virtual status_t connect(const sp<ICameraClient>& client) = 0; 78 virtual status_t lock() = 0; 79 virtual status_t unlock() = 0; 80 virtual status_t setPreviewDisplay(const sp<Surface>& surface) = 0; 81 virtual status_t setPreviewTexture(const sp<ISurfaceTexture>& surfaceTexture) = 0; 82 virtual void setPreviewCallbackFlag(int flag) = 0; 83 virtual status_t startPreview() = 0; 84 virtual void stopPreview() = 0; 85 virtual bool previewEnabled() = 0; 86 virtual status_t storeMetaDataInBuffers(bool enabled) = 0; 87 virtual status_t startRecording() = 0; 88 virtual void stopRecording() = 0; 89 virtual bool recordingEnabled() = 0; 90 virtual void releaseRecordingFrame(const sp<IMemory>& mem) = 0; 91 virtual status_t autoFocus() = 0; 92 virtual status_t cancelAutoFocus() = 0; 93 virtual status_t takePicture(int msgType) = 0; 94 virtual status_t setParameters(const String8& params) = 0; 95 virtual String8 getParameters() const = 0; 96 virtual status_t sendCommand(int32_t cmd, int32_t arg1, int32_t arg2) = 0; 97 98 // Interface used by CameraService 99 Client(const sp<CameraService>& cameraService, 100 const sp<ICameraClient>& cameraClient, 101 int cameraId, 102 int cameraFacing, 103 int clientPid); 104 ~Client(); 105 106 // return our camera client 107 const sp<ICameraClient>& getCameraClient() { 108 return mCameraClient; 109 } 110 111 virtual status_t dump(int fd, const Vector<String16>& args) = 0; 112 113 protected: 114 static Mutex* getClientLockFromCookie(void* user); 115 // convert client from cookie. Client lock should be acquired before getting Client. 116 static Client* getClientFromCookie(void* user); 117 118 // the instance is in the middle of destruction. When this is set, 119 // the instance should not be accessed from callback. 120 // CameraService's mClientLock should be acquired to access this. 121 bool mDestructionStarted; 122 123 // these are initialized in the constructor. 124 sp<CameraService> mCameraService; // immutable after constructor 125 sp<ICameraClient> mCameraClient; 126 int mCameraId; // immutable after constructor 127 int mCameraFacing; // immutable after constructor 128 pid_t mClientPid; 129 130 }; 131 132private: 133 Mutex mServiceLock; 134 wp<Client> mClient[MAX_CAMERAS]; // protected by mServiceLock 135 Mutex mClientLock[MAX_CAMERAS]; // prevent Client destruction inside callbacks 136 int mNumberOfCameras; 137 138 // atomics to record whether the hardware is allocated to some client. 139 volatile int32_t mBusy[MAX_CAMERAS]; 140 void setCameraBusy(int cameraId); 141 void setCameraFree(int cameraId); 142 143 // sounds 144 MediaPlayer* newMediaPlayer(const char *file); 145 146 Mutex mSoundLock; 147 sp<MediaPlayer> mSoundPlayer[NUM_SOUNDS]; 148 int mSoundRef; // reference count (release all MediaPlayer when 0) 149 150 camera_module_t *mModule; 151}; 152 153} // namespace android 154 155#endif 156