1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_SERVERS_CAMERA_CAMERACLIENT_H 18 #define ANDROID_SERVERS_CAMERA_CAMERACLIENT_H 19 20 #include "CameraService.h" 21 22 namespace android { 23 24 class MemoryHeapBase; 25 class CameraHardwareInterface; 26 27 /** 28 * Interface between android.hardware.Camera API and Camera HAL device for version 29 * CAMERA_DEVICE_API_VERSION_1_0. 30 */ 31 32 class CameraClient : public CameraService::Client 33 { 34 public: 35 // ICamera interface (see ICamera for details) 36 virtual void disconnect(); 37 virtual status_t connect(const sp<ICameraClient>& client); 38 virtual status_t lock(); 39 virtual status_t unlock(); 40 virtual status_t setPreviewTarget(const sp<IGraphicBufferProducer>& bufferProducer); 41 virtual void setPreviewCallbackFlag(int flag); 42 virtual status_t setPreviewCallbackTarget( 43 const sp<IGraphicBufferProducer>& callbackProducer); 44 virtual status_t startPreview(); 45 virtual void stopPreview(); 46 virtual bool previewEnabled(); 47 virtual status_t storeMetaDataInBuffers(bool enabled); 48 virtual status_t startRecording(); 49 virtual void stopRecording(); 50 virtual bool recordingEnabled(); 51 virtual void releaseRecordingFrame(const sp<IMemory>& mem); 52 virtual status_t autoFocus(); 53 virtual status_t cancelAutoFocus(); 54 virtual status_t takePicture(int msgType); 55 virtual status_t setParameters(const String8& params); 56 virtual String8 getParameters() const; 57 virtual status_t sendCommand(int32_t cmd, int32_t arg1, int32_t arg2); 58 59 // Interface used by CameraService 60 CameraClient(const sp<CameraService>& cameraService, 61 const sp<ICameraClient>& cameraClient, 62 const String16& clientPackageName, 63 int cameraId, 64 int cameraFacing, 65 int clientPid, 66 int clientUid, 67 int servicePid); 68 ~CameraClient(); 69 70 status_t initialize(camera_module_t *module); 71 72 status_t dump(int fd, const Vector<String16>& args); 73 74 private: 75 76 // check whether the calling process matches mClientPid. 77 status_t checkPid() const; 78 status_t checkPidAndHardware() const; // also check mHardware != 0 79 80 // these are internal functions used to set up preview buffers 81 status_t registerPreviewBuffers(); 82 83 // camera operation mode 84 enum camera_mode { 85 CAMERA_PREVIEW_MODE = 0, // frame automatically released 86 CAMERA_RECORDING_MODE = 1, // frame has to be explicitly released by releaseRecordingFrame() 87 }; 88 // these are internal functions used for preview/recording 89 status_t startCameraMode(camera_mode mode); 90 status_t startPreviewMode(); 91 status_t startRecordingMode(); 92 93 // internal function used by sendCommand to enable/disable shutter sound. 94 status_t enableShutterSound(bool enable); 95 96 // these are static callback functions 97 static void notifyCallback(int32_t msgType, int32_t ext1, int32_t ext2, void* user); 98 static void dataCallback(int32_t msgType, const sp<IMemory>& dataPtr, 99 camera_frame_metadata_t *metadata, void* user); 100 static void dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr, void* user); 101 // handlers for messages 102 void handleShutter(void); 103 void handlePreviewData(int32_t msgType, const sp<IMemory>& mem, 104 camera_frame_metadata_t *metadata); 105 void handlePostview(const sp<IMemory>& mem); 106 void handleRawPicture(const sp<IMemory>& mem); 107 void handleCompressedPicture(const sp<IMemory>& mem); 108 void handleGenericNotify(int32_t msgType, int32_t ext1, int32_t ext2); 109 void handleGenericData(int32_t msgType, const sp<IMemory>& dataPtr, 110 camera_frame_metadata_t *metadata); 111 void handleGenericDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr); 112 113 void copyFrameAndPostCopiedFrame( 114 int32_t msgType, 115 const sp<ICameraClient>& client, 116 const sp<IMemoryHeap>& heap, 117 size_t offset, size_t size, 118 camera_frame_metadata_t *metadata); 119 120 int getOrientation(int orientation, bool mirror); 121 122 status_t setPreviewWindow( 123 const sp<IBinder>& binder, 124 const sp<ANativeWindow>& window); 125 126 127 // these are initialized in the constructor. 128 sp<CameraHardwareInterface> mHardware; // cleared after disconnect() 129 int mPreviewCallbackFlag; 130 int mOrientation; // Current display orientation 131 bool mPlayShutterSound; 132 133 // Ensures atomicity among the public methods 134 mutable Mutex mLock; 135 // This is a binder of Surface or Surface. 136 sp<IBinder> mSurface; 137 sp<ANativeWindow> mPreviewWindow; 138 139 // If the user want us to return a copy of the preview frame (instead 140 // of the original one), we allocate mPreviewBuffer and reuse it if possible. 141 sp<MemoryHeapBase> mPreviewBuffer; 142 143 // We need to avoid the deadlock when the incoming command thread and 144 // the CameraHardwareInterface callback thread both want to grab mLock. 145 // An extra flag is used to tell the callback thread that it should stop 146 // trying to deliver the callback messages if the client is not 147 // interested in it anymore. For example, if the client is calling 148 // stopPreview(), the preview frame messages do not need to be delivered 149 // anymore. 150 151 // This function takes the same parameter as the enableMsgType() and 152 // disableMsgType() functions in CameraHardwareInterface. 153 void enableMsgType(int32_t msgType); 154 void disableMsgType(int32_t msgType); 155 volatile int32_t mMsgEnabled; 156 157 // This function keeps trying to grab mLock, or give up if the message 158 // is found to be disabled. It returns true if mLock is grabbed. 159 bool lockIfMessageWanted(int32_t msgType); 160 }; 161 162 } 163 164 #endif 165
