1 /* 2 * Copyright (C) 2008 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_HARDWARE_CAMERA_H 18 #define ANDROID_HARDWARE_CAMERA_H 19 20 #include <utils/Timers.h> 21 #include <camera/ICameraClient.h> 22 23 namespace android { 24 25 class ISurface; 26 27 /* 28 * A set of bit masks for specifying how the received preview frames are 29 * handled before the previewCallback() call. 30 * 31 * The least significant 3 bits of an "int" value are used for this purpose: 32 * 33 * ..... 0 0 0 34 * ^ ^ ^ 35 * | | |---------> determine whether the callback is enabled or not 36 * | |-----------> determine whether the callback is one-shot or not 37 * |-------------> determine whether the frame is copied out or not 38 * 39 * WARNING: 40 * When a frame is sent directly without copying, it is the frame receiver's 41 * responsiblity to make sure that the frame data won't get corrupted by 42 * subsequent preview frames filled by the camera. This flag is recommended 43 * only when copying out data brings significant performance price and the 44 * handling/processing of the received frame data is always faster than 45 * the preview frame rate so that data corruption won't occur. 46 * 47 * For instance, 48 * 1. 0x00 disables the callback. In this case, copy out and one shot bits 49 * are ignored. 50 * 2. 0x01 enables a callback without copying out the received frames. A 51 * typical use case is the Camcorder application to avoid making costly 52 * frame copies. 53 * 3. 0x05 is enabling a callback with frame copied out repeatedly. A typical 54 * use case is the Camera application. 55 * 4. 0x07 is enabling a callback with frame copied out only once. A typical use 56 * case is the Barcode scanner application. 57 */ 58 #define FRAME_CALLBACK_FLAG_ENABLE_MASK 0x01 59 #define FRAME_CALLBACK_FLAG_ONE_SHOT_MASK 0x02 60 #define FRAME_CALLBACK_FLAG_COPY_OUT_MASK 0x04 61 62 // Typical use cases 63 #define FRAME_CALLBACK_FLAG_NOOP 0x00 64 #define FRAME_CALLBACK_FLAG_CAMCORDER 0x01 65 #define FRAME_CALLBACK_FLAG_CAMERA 0x05 66 #define FRAME_CALLBACK_FLAG_BARCODE_SCANNER 0x07 67 68 // msgType in notifyCallback and dataCallback functions 69 enum { 70 CAMERA_MSG_ERROR = 0x001, 71 CAMERA_MSG_SHUTTER = 0x002, 72 CAMERA_MSG_FOCUS = 0x004, 73 CAMERA_MSG_ZOOM = 0x008, 74 CAMERA_MSG_PREVIEW_FRAME = 0x010, 75 CAMERA_MSG_VIDEO_FRAME = 0x020, 76 CAMERA_MSG_POSTVIEW_FRAME = 0x040, 77 CAMERA_MSG_RAW_IMAGE = 0x080, 78 CAMERA_MSG_COMPRESSED_IMAGE = 0x100, 79 CAMERA_MSG_ALL_MSGS = 0x1FF 80 }; 81 82 // cmdType in sendCommand functions 83 enum { 84 CAMERA_CMD_START_SMOOTH_ZOOM = 1, 85 CAMERA_CMD_STOP_SMOOTH_ZOOM = 2, 86 // Set the clockwise rotation of preview display (setPreviewDisplay) in 87 // degrees. This affects the preview frames and the picture displayed after 88 // snapshot. This method is useful for portrait mode applications. Note that 89 // preview display of front-facing cameras is flipped horizontally before 90 // the rotation, that is, the image is reflected along the central vertical 91 // axis of the camera sensor. So the users can see themselves as looking 92 // into a mirror. 93 // 94 // This does not affect the order of byte array of CAMERA_MSG_PREVIEW_FRAME, 95 // CAMERA_MSG_VIDEO_FRAME, CAMERA_MSG_POSTVIEW_FRAME, CAMERA_MSG_RAW_IMAGE, 96 // or CAMERA_MSG_COMPRESSED_IMAGE. This is not allowed to be set during 97 // preview. 98 CAMERA_CMD_SET_DISPLAY_ORIENTATION = 3, 99 }; 100 101 // camera fatal errors 102 enum { 103 CAMERA_ERROR_UKNOWN = 1, 104 CAMERA_ERROR_SERVER_DIED = 100 105 }; 106 107 enum { 108 CAMERA_FACING_BACK = 0, /* The facing of the camera is opposite to that of the screen. */ 109 CAMERA_FACING_FRONT = 1 /* The facing of the camera is the same as that of the screen. */ 110 }; 111 112 struct CameraInfo { 113 114 /** 115 * The direction that the camera faces to. It should be 116 * CAMERA_FACING_BACK or CAMERA_FACING_FRONT. 117 */ 118 int facing; 119 120 /** 121 * The orientation of the camera image. The value is the angle that the 122 * camera image needs to be rotated clockwise so it shows correctly on 123 * the display in its natural orientation. It should be 0, 90, 180, or 270. 124 * 125 * For example, suppose a device has a naturally tall screen. The 126 * back-facing camera sensor is mounted in landscape. You are looking at 127 * the screen. If the top side of the camera sensor is aligned with the 128 * right edge of the screen in natural orientation, the value should be 129 * 90. If the top side of a front-facing camera sensor is aligned with 130 * the right of the screen, the value should be 270. 131 */ 132 int orientation; 133 }; 134 135 class ICameraService; 136 class ICamera; 137 class Surface; 138 class Mutex; 139 class String8; 140 141 // ref-counted object for callbacks 142 class CameraListener: virtual public RefBase 143 { 144 public: 145 virtual void notify(int32_t msgType, int32_t ext1, int32_t ext2) = 0; 146 virtual void postData(int32_t msgType, const sp<IMemory>& dataPtr) = 0; 147 virtual void postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr) = 0; 148 }; 149 150 class Camera : public BnCameraClient, public IBinder::DeathRecipient 151 { 152 public: 153 // construct a camera client from an existing remote 154 static sp<Camera> create(const sp<ICamera>& camera); 155 static int32_t getNumberOfCameras(); 156 static status_t getCameraInfo(int cameraId, 157 struct CameraInfo* cameraInfo); 158 static sp<Camera> connect(int cameraId); 159 ~Camera(); 160 void init(); 161 162 status_t reconnect(); 163 void disconnect(); 164 status_t lock(); 165 status_t unlock(); 166 getStatus()167 status_t getStatus() { return mStatus; } 168 169 // pass the buffered ISurface to the camera service 170 status_t setPreviewDisplay(const sp<Surface>& surface); 171 status_t setPreviewDisplay(const sp<ISurface>& surface); 172 173 // start preview mode, must call setPreviewDisplay first 174 status_t startPreview(); 175 176 // stop preview mode 177 void stopPreview(); 178 179 // get preview state 180 bool previewEnabled(); 181 182 // start recording mode, must call setPreviewDisplay first 183 status_t startRecording(); 184 185 // stop recording mode 186 void stopRecording(); 187 188 // get recording state 189 bool recordingEnabled(); 190 191 // release a recording frame 192 void releaseRecordingFrame(const sp<IMemory>& mem); 193 194 // autoFocus - status returned from callback 195 status_t autoFocus(); 196 197 // cancel auto focus 198 status_t cancelAutoFocus(); 199 200 // take a picture - picture returned from callback 201 status_t takePicture(); 202 203 // set preview/capture parameters - key/value pairs 204 status_t setParameters(const String8& params); 205 206 // get preview/capture parameters - key/value pairs 207 String8 getParameters() const; 208 209 // send command to camera driver 210 status_t sendCommand(int32_t cmd, int32_t arg1, int32_t arg2); 211 212 void setListener(const sp<CameraListener>& listener); 213 void setPreviewCallbackFlags(int preview_callback_flag); 214 215 // ICameraClient interface 216 virtual void notifyCallback(int32_t msgType, int32_t ext, int32_t ext2); 217 virtual void dataCallback(int32_t msgType, const sp<IMemory>& dataPtr); 218 virtual void dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr); 219 220 sp<ICamera> remote(); 221 222 private: 223 Camera(); 224 Camera(const Camera&); 225 Camera& operator=(const Camera); 226 virtual void binderDied(const wp<IBinder>& who); 227 228 class DeathNotifier: public IBinder::DeathRecipient 229 { 230 public: DeathNotifier()231 DeathNotifier() { 232 } 233 234 virtual void binderDied(const wp<IBinder>& who); 235 }; 236 237 static sp<DeathNotifier> mDeathNotifier; 238 239 // helper function to obtain camera service handle 240 static const sp<ICameraService>& getCameraService(); 241 242 sp<ICamera> mCamera; 243 status_t mStatus; 244 245 sp<CameraListener> mListener; 246 247 friend class DeathNotifier; 248 249 static Mutex mLock; 250 static sp<ICameraService> mCameraService; 251 252 }; 253 254 }; // namespace android 255 256 #endif 257