Camera.h revision 4b79168835965cf0fc41ebe2a367e22b4cb20d08
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 23namespace android { 24 25/* 26 * A set of bit masks for specifying how the received preview frames are 27 * handled before the previewCallback() call. 28 * 29 * The least significant 3 bits of an "int" value are used for this purpose: 30 * 31 * ..... 0 0 0 32 * ^ ^ ^ 33 * | | |---------> determine whether the callback is enabled or not 34 * | |-----------> determine whether the callback is one-shot or not 35 * |-------------> determine whether the frame is copied out or not 36 * 37 * WARNING: 38 * When a frame is sent directly without copying, it is the frame receiver's 39 * responsiblity to make sure that the frame data won't get corrupted by 40 * subsequent preview frames filled by the camera. This flag is recommended 41 * only when copying out data brings significant performance price and the 42 * handling/processing of the received frame data is always faster than 43 * the preview frame rate so that data corruption won't occur. 44 * 45 * For instance, 46 * 1. 0x00 disables the callback. In this case, copy out and one shot bits 47 * are ignored. 48 * 2. 0x01 enables a callback without copying out the received frames. A 49 * typical use case is the Camcorder application to avoid making costly 50 * frame copies. 51 * 3. 0x05 is enabling a callback with frame copied out repeatedly. A typical 52 * use case is the Camera application. 53 * 4. 0x07 is enabling a callback with frame copied out only once. A typical use 54 * case is the Barcode scanner application. 55 */ 56#define FRAME_CALLBACK_FLAG_ENABLE_MASK 0x01 57#define FRAME_CALLBACK_FLAG_ONE_SHOT_MASK 0x02 58#define FRAME_CALLBACK_FLAG_COPY_OUT_MASK 0x04 59 60// Typical use cases 61#define FRAME_CALLBACK_FLAG_NOOP 0x00 62#define FRAME_CALLBACK_FLAG_CAMCORDER 0x01 63#define FRAME_CALLBACK_FLAG_CAMERA 0x05 64#define FRAME_CALLBACK_FLAG_BARCODE_SCANNER 0x07 65 66// msgType in notifyCallback and dataCallback functions 67enum { 68 CAMERA_MSG_ERROR = 0x001, 69 CAMERA_MSG_SHUTTER = 0x002, 70 CAMERA_MSG_FOCUS = 0x004, 71 CAMERA_MSG_ZOOM = 0x008, 72 CAMERA_MSG_PREVIEW_FRAME = 0x010, 73 CAMERA_MSG_VIDEO_FRAME = 0x020, 74 CAMERA_MSG_POSTVIEW_FRAME = 0x040, 75 CAMERA_MSG_RAW_IMAGE = 0x080, 76 CAMERA_MSG_COMPRESSED_IMAGE = 0x100, 77 CAMERA_MSG_ALL_MSGS = 0x1FF 78}; 79 80// cmdType in sendCommand functions 81enum { 82 CAMERA_CMD_START_SMOOTH_ZOOM = 1, 83 CAMERA_CMD_STOP_SMOOTH_ZOOM = 2, 84 CAMERA_CMD_SET_DISPLAY_ORIENTATION = 3, 85}; 86 87// camera fatal errors 88enum { 89 CAMERA_ERROR_UKNOWN = 1, 90 CAMERA_ERROR_SERVER_DIED = 100 91}; 92 93enum { 94 CAMERA_FACING_BACK = 0, 95 CAMERA_FACING_FRONT = 1 /* The camera faces to the user */ 96}; 97 98struct CameraInfo { 99 100 /** 101 * The direction that the camera faces to. It should be 102 * CAMERA_FACING_BACK or CAMERA_FACING_FRONT. 103 */ 104 int facing; 105 106 /** 107 * The orientation of the camera image. The value is the angle that the 108 * camera image needs to be rotated clockwise so it shows correctly on 109 * the display in its natural orientation. It should be 0, 90, 180, or 270. 110 * 111 * For example, suppose a device has a naturally tall screen, but the camera 112 * sensor is mounted in landscape. If the top side of the camera sensor is 113 * aligned with the right edge of the display in natural orientation, the 114 * value should be 90. 115 */ 116 int orientation; 117}; 118 119class ICameraService; 120class ICamera; 121class Surface; 122class Mutex; 123class String8; 124 125// ref-counted object for callbacks 126class CameraListener: virtual public RefBase 127{ 128public: 129 virtual void notify(int32_t msgType, int32_t ext1, int32_t ext2) = 0; 130 virtual void postData(int32_t msgType, const sp<IMemory>& dataPtr) = 0; 131 virtual void postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr) = 0; 132}; 133 134class Camera : public BnCameraClient, public IBinder::DeathRecipient 135{ 136public: 137 // construct a camera client from an existing remote 138 static sp<Camera> create(const sp<ICamera>& camera); 139 static int32_t getNumberOfCameras(); 140 static status_t getCameraInfo(int cameraId, 141 struct CameraInfo* cameraInfo); 142 static sp<Camera> connect(int cameraId); 143 ~Camera(); 144 void init(); 145 146 status_t reconnect(); 147 void disconnect(); 148 status_t lock(); 149 status_t unlock(); 150 151 status_t getStatus() { return mStatus; } 152 153 // pass the buffered Surface to the camera service 154 status_t setPreviewDisplay(const sp<Surface>& surface); 155 156 // start preview mode, must call setPreviewDisplay first 157 status_t startPreview(); 158 159 // stop preview mode 160 void stopPreview(); 161 162 // get preview state 163 bool previewEnabled(); 164 165 // start recording mode, must call setPreviewDisplay first 166 status_t startRecording(); 167 168 // stop recording mode 169 void stopRecording(); 170 171 // get recording state 172 bool recordingEnabled(); 173 174 // release a recording frame 175 void releaseRecordingFrame(const sp<IMemory>& mem); 176 177 // autoFocus - status returned from callback 178 status_t autoFocus(); 179 180 // cancel auto focus 181 status_t cancelAutoFocus(); 182 183 // take a picture - picture returned from callback 184 status_t takePicture(); 185 186 // set preview/capture parameters - key/value pairs 187 status_t setParameters(const String8& params); 188 189 // get preview/capture parameters - key/value pairs 190 String8 getParameters() const; 191 192 // send command to camera driver 193 status_t sendCommand(int32_t cmd, int32_t arg1, int32_t arg2); 194 195 void setListener(const sp<CameraListener>& listener); 196 void setPreviewCallbackFlags(int preview_callback_flag); 197 198 // ICameraClient interface 199 virtual void notifyCallback(int32_t msgType, int32_t ext, int32_t ext2); 200 virtual void dataCallback(int32_t msgType, const sp<IMemory>& dataPtr); 201 virtual void dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr); 202 203 sp<ICamera> remote(); 204 205private: 206 Camera(); 207 Camera(const Camera&); 208 Camera& operator=(const Camera); 209 virtual void binderDied(const wp<IBinder>& who); 210 211 class DeathNotifier: public IBinder::DeathRecipient 212 { 213 public: 214 DeathNotifier() { 215 } 216 217 virtual void binderDied(const wp<IBinder>& who); 218 }; 219 220 static sp<DeathNotifier> mDeathNotifier; 221 222 // helper function to obtain camera service handle 223 static const sp<ICameraService>& getCameraService(); 224 225 sp<ICamera> mCamera; 226 status_t mStatus; 227 228 sp<CameraListener> mListener; 229 230 friend class DeathNotifier; 231 232 static Mutex mLock; 233 static sp<ICameraService> mCameraService; 234 235}; 236 237}; // namespace android 238 239#endif 240