camera.h revision 9d5bfd35414f2be2f1ea8a2cabee8f407d3e38c0
1/* 2 * Copyright (C) 2011 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 SYSTEM_CORE_INCLUDE_ANDROID_CAMERA_H 18#define SYSTEM_CORE_INCLUDE_ANDROID_CAMERA_H 19 20#include <stdint.h> 21#include <sys/cdefs.h> 22#include <sys/types.h> 23#include <cutils/native_handle.h> 24#include <hardware/hardware.h> 25#include <hardware/gralloc.h> 26 27__BEGIN_DECLS 28 29/** 30 * A set of bit masks for specifying how the received preview frames are 31 * handled before the previewCallback() call. 32 * 33 * The least significant 3 bits of an "int" value are used for this purpose: 34 * 35 * ..... 0 0 0 36 * ^ ^ ^ 37 * | | |---------> determine whether the callback is enabled or not 38 * | |-----------> determine whether the callback is one-shot or not 39 * |-------------> determine whether the frame is copied out or not 40 * 41 * WARNING: When a frame is sent directly without copying, it is the frame 42 * receiver's responsiblity to make sure that the frame data won't get 43 * corrupted by subsequent preview frames filled by the camera. This flag is 44 * recommended only when copying out data brings significant performance price 45 * and the handling/processing of the received frame data is always faster than 46 * the preview frame rate so that data corruption won't occur. 47 * 48 * For instance, 49 * 1. 0x00 disables the callback. In this case, copy out and one shot bits 50 * are ignored. 51 * 2. 0x01 enables a callback without copying out the received frames. A 52 * typical use case is the Camcorder application to avoid making costly 53 * frame copies. 54 * 3. 0x05 is enabling a callback with frame copied out repeatedly. A typical 55 * use case is the Camera application. 56 * 4. 0x07 is enabling a callback with frame copied out only once. A typical 57 * use case is the Barcode scanner application. 58 */ 59 60enum { 61 CAMERA_FRAME_CALLBACK_FLAG_ENABLE_MASK = 0x01, 62 CAMERA_FRAME_CALLBACK_FLAG_ONE_SHOT_MASK = 0x02, 63 CAMERA_FRAME_CALLBACK_FLAG_COPY_OUT_MASK = 0x04, 64 /** Typical use cases */ 65 CAMERA_FRAME_CALLBACK_FLAG_NOOP = 0x00, 66 CAMERA_FRAME_CALLBACK_FLAG_CAMCORDER = 0x01, 67 CAMERA_FRAME_CALLBACK_FLAG_CAMERA = 0x05, 68 CAMERA_FRAME_CALLBACK_FLAG_BARCODE_SCANNER = 0x07 69}; 70 71/** msgType in notifyCallback and dataCallback functions */ 72enum { 73 CAMERA_MSG_ERROR = 0x0001, // notifyCallback 74 CAMERA_MSG_SHUTTER = 0x0002, // notifyCallback 75 CAMERA_MSG_FOCUS = 0x0004, // notifyCallback 76 CAMERA_MSG_ZOOM = 0x0008, // notifyCallback 77 CAMERA_MSG_PREVIEW_FRAME = 0x0010, // dataCallback 78 CAMERA_MSG_VIDEO_FRAME = 0x0020, // data_timestamp_callback 79 CAMERA_MSG_POSTVIEW_FRAME = 0x0040, // dataCallback 80 CAMERA_MSG_RAW_IMAGE = 0x0080, // dataCallback 81 CAMERA_MSG_COMPRESSED_IMAGE = 0x0100, // dataCallback 82 CAMERA_MSG_RAW_IMAGE_NOTIFY = 0x0200, // dataCallback 83 // Face metadata. This can be combined with CAMERA_MSG_PREVIEW_FRAME in 84 // dataCallback. For example, the apps can request PREVIEW_FRAME and FACE. 85 // Or the apps can request only PREVIEW_FRAME or only FACE. 86 CAMERA_MSG_METADATA_FACE = 0x0400, // dataCallback 87 CAMERA_MSG_ALL_MSGS = 0xFFFF 88}; 89 90/** cmdType in sendCommand functions */ 91enum { 92 CAMERA_CMD_START_SMOOTH_ZOOM = 1, 93 CAMERA_CMD_STOP_SMOOTH_ZOOM = 2, 94 95 /** 96 * Set the clockwise rotation of preview display (setPreviewDisplay) in 97 * degrees. This affects the preview frames and the picture displayed after 98 * snapshot. This method is useful for portrait mode applications. Note 99 * that preview display of front-facing cameras is flipped horizontally 100 * before the rotation, that is, the image is reflected along the central 101 * vertical axis of the camera sensor. So the users can see themselves as 102 * looking into a mirror. 103 * 104 * This does not affect the order of byte array of 105 * CAMERA_MSG_PREVIEW_FRAME, CAMERA_MSG_VIDEO_FRAME, 106 * CAMERA_MSG_POSTVIEW_FRAME, CAMERA_MSG_RAW_IMAGE, or 107 * CAMERA_MSG_COMPRESSED_IMAGE. This is not allowed to be set during 108 * preview 109 */ 110 CAMERA_CMD_SET_DISPLAY_ORIENTATION = 3, 111 112 /** 113 * cmdType to disable/enable shutter sound. In sendCommand passing arg1 = 114 * 0 will disable, while passing arg1 = 1 will enable the shutter sound. 115 */ 116 CAMERA_CMD_ENABLE_SHUTTER_SOUND = 4, 117 118 /* cmdType to play recording sound */ 119 CAMERA_CMD_PLAY_RECORDING_SOUND = 5, 120 121 /** 122 * Start the face detection. This should be called after preview is started. 123 * The camera will notify the listener of CAMERA_MSG_FACE and the detected 124 * faces in the preview frame. The detected faces may be the same as the 125 * previous ones. Apps should call CAMERA_CMD_STOP_FACE_DETECTION to stop 126 * the face detection. This method is supported if CameraParameters 127 * KEY_MAX_NUM_HW_DETECTED_FACES or KEY_MAX_NUM_SW_DETECTED_FACES is 128 * bigger than 0. Hardware and software face detection should not be running 129 * at the same time. If the face detection has started, apps should not send 130 * this again. 131 * 132 * In hardware face detection mode, CameraParameters KEY_WHITE_BALANCE, 133 * KEY_FOCUS_AREAS and KEY_METERING_AREAS have no effect. 134 * 135 * arg1 is the face detection type. It can be CAMERA_FACE_DETECTION_HW or 136 * CAMERA_FACE_DETECTION_SW. 137 */ 138 CAMERA_CMD_START_FACE_DETECTION = 6, 139 140 /** 141 * Stop the face detection. 142 */ 143 CAMERA_CMD_STOP_FACE_DETECTION = 7, 144}; 145 146/** camera fatal errors */ 147enum { 148 CAMERA_ERROR_UNKNOWN = 1, 149 CAMERA_ERROR_SERVER_DIED = 100 150}; 151 152enum { 153 /** The facing of the camera is opposite to that of the screen. */ 154 CAMERA_FACING_BACK = 0, 155 /** The facing of the camera is the same as that of the screen. */ 156 CAMERA_FACING_FRONT = 1 157}; 158 159enum { 160 /** Hardware face detection. It does not use much CPU. */ 161 CAMERA_FACE_DETECTION_HW = 0, 162 /** 163 * Software face detection. It uses some CPU. Applications must use 164 * Camera.setPreviewTexture for preview in this mode. 165 */ 166 CAMERA_FACE_DETECTION_SW = 1 167}; 168 169/** 170 * The information of a face from camera face detection. 171 */ 172typedef struct camera_face { 173 /** 174 * Bounds of the face [left, top, right, bottom]. (-1000, -1000) represents 175 * the top-left of the camera field of view, and (1000, 1000) represents the 176 * bottom-right of the field of view. The width and height cannot be 0 or 177 * negative. This is supported by both hardware and software face detection. 178 * 179 * The direction is relative to the sensor orientation, that is, what the 180 * sensor sees. The direction is not affected by the rotation or mirroring 181 * of CAMERA_CMD_SET_DISPLAY_ORIENTATION. 182 */ 183 int rect[4]; 184 185 /** 186 * The confidence level of the face. The range is 1 to 100. 100 is the 187 * highest confidence. This is supported by both hardware and software 188 * face detection. 189 */ 190 int score; 191 192 /** 193 * An unique id per face while the face is visible to the tracker. If 194 * the face leaves the field-of-view and comes back, it will get a new 195 * id. If the value is 0, id is not supported. 196 */ 197 int id; 198 199 /** 200 * The coordinates of the center of the left eye. The range is -1000 to 201 * 1000. -2000, -2000 if this is not supported. 202 */ 203 int left_eye[2]; 204 205 /** 206 * The coordinates of the center of the right eye. The range is -1000 to 207 * 1000. -2000, -2000 if this is not supported. 208 */ 209 int right_eye[2]; 210 211 /** 212 * The coordinates of the center of the mouth. The range is -1000 to 1000. 213 * -2000, -2000 if this is not supported. 214 */ 215 int mouth[2]; 216 217} camera_face_t; 218 219/** 220 * The metadata of the frame data. 221 */ 222typedef struct camera_frame_metadata { 223 /** 224 * The number of detected faces in the frame. 225 */ 226 int number_of_faces; 227 228 /** 229 * An array of the detected faces. The length is number_of_faces. The list 230 * is sorted by the score. The highest score is the first element. 231 */ 232 camera_face_t *faces; 233} camera_frame_metadata_t; 234 235__END_DECLS 236 237#endif /* SYSTEM_CORE_INCLUDE_ANDROID_CAMERA_H */ 238