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 binder::Status disconnect(); 37 virtual status_t connect(const sp<hardware::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 setVideoBufferMode(int32_t videoBufferMode); 48 virtual status_t startRecording(); 49 virtual void stopRecording(); 50 virtual bool recordingEnabled(); 51 virtual void releaseRecordingFrame(const sp<IMemory>& mem); 52 virtual void releaseRecordingFrameHandle(native_handle_t *handle); 53 virtual status_t autoFocus(); 54 virtual status_t cancelAutoFocus(); 55 virtual status_t takePicture(int msgType); 56 virtual status_t setParameters(const String8& params); 57 virtual String8 getParameters() const; 58 virtual status_t sendCommand(int32_t cmd, int32_t arg1, int32_t arg2); 59 virtual status_t setVideoTarget(const sp<IGraphicBufferProducer>& bufferProducer); 60 61 // Interface used by CameraService 62 CameraClient(const sp<CameraService>& cameraService, 63 const sp<hardware::ICameraClient>& cameraClient, 64 const String16& clientPackageName, 65 int cameraId, 66 int cameraFacing, 67 int clientPid, 68 int clientUid, 69 int servicePid, 70 bool legacyMode = false); 71 ~CameraClient(); 72 73 status_t initialize(CameraModule *module); 74 75 virtual status_t dump(int fd, const Vector<String16>& args); 76 77 virtual status_t dumpClient(int fd, const Vector<String16>& args); 78 79 private: 80 81 // check whether the calling process matches mClientPid. 82 status_t checkPid() const; 83 status_t checkPidAndHardware() const; // also check mHardware != 0 84 85 // these are internal functions used to set up preview buffers 86 status_t registerPreviewBuffers(); 87 88 // camera operation mode 89 enum camera_mode { 90 CAMERA_PREVIEW_MODE = 0, // frame automatically released 91 CAMERA_RECORDING_MODE = 1, // frame has to be explicitly released by releaseRecordingFrame() 92 }; 93 // these are internal functions used for preview/recording 94 status_t startCameraMode(camera_mode mode); 95 status_t startPreviewMode(); 96 status_t startRecordingMode(); 97 98 // internal function used by sendCommand to enable/disable shutter sound. 99 status_t enableShutterSound(bool enable); 100 101 // these are static callback functions 102 static void notifyCallback(int32_t msgType, int32_t ext1, int32_t ext2, void* user); 103 static void dataCallback(int32_t msgType, const sp<IMemory>& dataPtr, 104 camera_frame_metadata_t *metadata, void* user); 105 static void dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr, void* user); 106 // handlers for messages 107 void handleShutter(void); 108 void handlePreviewData(int32_t msgType, const sp<IMemory>& mem, 109 camera_frame_metadata_t *metadata); 110 void handlePostview(const sp<IMemory>& mem); 111 void handleRawPicture(const sp<IMemory>& mem); 112 void handleCompressedPicture(const sp<IMemory>& mem); 113 void handleGenericNotify(int32_t msgType, int32_t ext1, int32_t ext2); 114 void handleGenericData(int32_t msgType, const sp<IMemory>& dataPtr, 115 camera_frame_metadata_t *metadata); 116 void handleGenericDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr); 117 118 void copyFrameAndPostCopiedFrame( 119 int32_t msgType, 120 const sp<hardware::ICameraClient>& client, 121 const sp<IMemoryHeap>& heap, 122 size_t offset, size_t size, 123 camera_frame_metadata_t *metadata); 124 125 int getOrientation(int orientation, bool mirror); 126 127 status_t setPreviewWindow( 128 const sp<IBinder>& binder, 129 const sp<ANativeWindow>& window); 130 131 132 // these are initialized in the constructor. 133 sp<CameraHardwareInterface> mHardware; // cleared after disconnect() 134 int mPreviewCallbackFlag; 135 int mOrientation; // Current display orientation 136 bool mPlayShutterSound; 137 bool mLegacyMode; // camera2 api legacy mode? 138 139 // Ensures atomicity among the public methods 140 mutable Mutex mLock; 141 // This is a binder of Surface or Surface. 142 sp<IBinder> mSurface; 143 sp<ANativeWindow> mPreviewWindow; 144 145 // If the user want us to return a copy of the preview frame (instead 146 // of the original one), we allocate mPreviewBuffer and reuse it if possible. 147 sp<MemoryHeapBase> mPreviewBuffer; 148 149 // Debugging information 150 CameraParameters mLatestSetParameters; 151 152 // mAvailableCallbackBuffers stores sp<IMemory> that HAL uses to send VideoNativeHandleMetadata. 153 // It will be used to send VideoNativeHandleMetadata back to HAL when camera receives the 154 // native handle from releaseRecordingFrameHandle. 155 Mutex mAvailableCallbackBuffersLock; 156 std::vector<sp<IMemory>> mAvailableCallbackBuffers; 157 158 // We need to avoid the deadlock when the incoming command thread and 159 // the CameraHardwareInterface callback thread both want to grab mLock. 160 // An extra flag is used to tell the callback thread that it should stop 161 // trying to deliver the callback messages if the client is not 162 // interested in it anymore. For example, if the client is calling 163 // stopPreview(), the preview frame messages do not need to be delivered 164 // anymore. 165 166 // This function takes the same parameter as the enableMsgType() and 167 // disableMsgType() functions in CameraHardwareInterface. 168 void enableMsgType(int32_t msgType); 169 void disableMsgType(int32_t msgType); 170 volatile int32_t mMsgEnabled; 171 172 // This function keeps trying to grab mLock, or give up if the message 173 // is found to be disabled. It returns true if mLock is grabbed. 174 bool lockIfMessageWanted(int32_t msgType); 175 }; 176 177 } 178 179 #endif 180