/* * Copyright (C) 2019 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef ANDROID_SERVERS_CAMERA_EXIF_UTILS_H #define ANDROID_SERVERS_CAMERA_EXIF_UTILS_H #include "CameraMetadata.h" namespace android { namespace camera3 { /* * Orientation value: * 1 2 3 4 5 6 7 8 * * 888888 888888 88 88 8888888888 88 88 8888888888 * 88 88 88 88 88 88 88 88 88 88 88 88 * 8888 8888 8888 8888 88 8888888888 8888888888 88 * 88 88 88 88 * 88 88 888888 888888 */ enum ExifOrientation : uint16_t { ORIENTATION_UNDEFINED = 0x0, ORIENTATION_0_DEGREES = 0x1, ORIENTATION_90_DEGREES = 0x6, ORIENTATION_180_DEGREES = 0x3, ORIENTATION_270_DEGREES = 0x8, }; // This is based on the camera HIDL shim implementation, which was in turned // based on original ChromeOS ARC implementation of a V4L2 HAL // ExifUtils can override APP1 segment with tags which caller set. ExifUtils can // also add a thumbnail in the APP1 segment if thumbnail size is specified. // ExifUtils can be reused with different images by calling initialize(). // // Example of using this class : // std::unique_ptr utils(ExifUtils::Create()); // utils->initialize(const unsigned char* app1Segment, size_t app1SegmentSize); // ... // // Call ExifUtils functions to set Exif tags. // ... // utils->GenerateApp1(); // unsigned int app1Length = utils->GetApp1Length(); // uint8_t* app1Buffer = new uint8_t[app1Length]; // memcpy(app1Buffer, utils->GetApp1Buffer(), app1Length); class ExifUtils { public: virtual ~ExifUtils(); static ExifUtils* create(); // Initialize() can be called multiple times. The setting of Exif tags will be // cleared. virtual bool initialize(const unsigned char *app1Segment, size_t app1SegmentSize) = 0; virtual bool initializeEmpty() = 0; // Set all known fields from a metadata structure virtual bool setFromMetadata(const CameraMetadata& metadata, const CameraMetadata& staticInfo, const size_t imageWidth, const size_t imageHeight) = 0; // Sets the len aperture. // Returns false if memory allocation fails. virtual bool setAperture(float aperture) = 0; // sets the color space. // Returns false if memory allocation fails. virtual bool setColorSpace(uint16_t color_space) = 0; // Sets the date and time of image last modified. It takes local time. The // name of the tag is DateTime in IFD0. // Returns false if memory allocation fails. virtual bool setDateTime(const struct tm& t) = 0; // Sets the digital zoom ratio. If the numerator is 0, it means digital zoom // was not used. // Returns false if memory allocation fails. virtual bool setDigitalZoomRatio(uint32_t crop_width, uint32_t crop_height, uint32_t sensor_width, uint32_t sensor_height) = 0; // Sets the exposure bias. // Returns false if memory allocation fails. virtual bool setExposureBias(int32_t ev, uint32_t ev_step_numerator, uint32_t ev_step_denominator) = 0; // Sets the exposure mode set when the image was shot. // Returns false if memory allocation fails. virtual bool setExposureMode(uint8_t exposure_mode) = 0; // Sets the exposure time, given in seconds. // Returns false if memory allocation fails. virtual bool setExposureTime(float exposure_time) = 0; // Sets the status of flash. // Returns false if memory allocation fails. virtual bool setFlash(uint8_t flash_available, uint8_t flash_state, uint8_t ae_mode) = 0; // Sets the F number. // Returns false if memory allocation fails. virtual bool setFNumber(float f_number) = 0; // Sets the focal length of lens used to take the image in millimeters. // Returns false if memory allocation fails. virtual bool setFocalLength(float focal_length) = 0; // Sets the focal length of lens for 35mm film used to take the image in millimeters. // Returns false if memory allocation fails. virtual bool setFocalLengthIn35mmFilm(float focal_length, float sensor_size_x, float sensor_size_y) = 0; // Sets the altitude in meters. // Returns false if memory allocation fails. virtual bool setGpsAltitude(double altitude) = 0; // Sets the latitude with degrees minutes seconds format. // Returns false if memory allocation fails. virtual bool setGpsLatitude(double latitude) = 0; // Sets the longitude with degrees minutes seconds format. // Returns false if memory allocation fails. virtual bool setGpsLongitude(double longitude) = 0; // Sets GPS processing method. // Returns false if memory allocation fails. virtual bool setGpsProcessingMethod(const std::string& method) = 0; // Sets GPS date stamp and time stamp (atomic clock). It takes UTC time. // Returns false if memory allocation fails. virtual bool setGpsTimestamp(const struct tm& t) = 0; // Sets the height (number of rows) of main image. // Returns false if memory allocation fails. virtual bool setImageHeight(uint32_t length) = 0; // Sets the width (number of columns) of main image. // Returns false if memory allocation fails. virtual bool setImageWidth(uint32_t width) = 0; // Sets the ISO speed. // Returns false if memory allocation fails. virtual bool setIsoSpeedRating(uint16_t iso_speed_ratings) = 0; // Sets the smallest F number of the lens. // Returns false if memory allocation fails. virtual bool setMaxAperture(float aperture) = 0; // Sets image orientation. // Returns false if memory allocation fails. virtual bool setOrientation(uint16_t degrees) = 0; // Sets image orientation. // Returns false if memory allocation fails. virtual bool setOrientationValue(ExifOrientation orientationValue) = 0; // Sets the shutter speed. // Returns false if memory allocation fails. virtual bool setShutterSpeed(float exposure_time) = 0; // Sets the distance to the subject, given in meters. // Returns false if memory allocation fails. virtual bool setSubjectDistance(float diopters) = 0; // Sets the fractions of seconds for the tag. // Returns false if memory allocation fails. virtual bool setSubsecTime(const std::string& subsec_time) = 0; // Sets the white balance mode set when the image was shot. // Returns false if memory allocation fails. virtual bool setWhiteBalance(uint8_t white_blanace) = 0; // Generates APP1 segment. // Returns false if generating APP1 segment fails. virtual bool generateApp1() = 0; // Gets buffer of APP1 segment. This method must be called only after calling // GenerateAPP1(). virtual const uint8_t* getApp1Buffer() = 0; // Gets length of APP1 segment. This method must be called only after calling // GenerateAPP1(). virtual unsigned int getApp1Length() = 0; }; } // namespace camera3 } // namespace android #endif // ANDROID_SERVERS_CAMERA_EXIF_UTILS_H