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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2020, Google Inc.
*
* exif.h - EXIF tag creator using libexif
*/
#pragma once
#include <chrono>
#include <string>
#include <time.h>
#include <vector>
#include <libexif/exif-data.h>
#include <libcamera/base/span.h>
#include <libcamera/geometry.h>
class Exif
{
public:
Exif();
~Exif();
enum Compression {
None = 1,
JPEG = 6,
};
enum Flash {
/* bit 0 */
Fired = 0x01,
/* bits 1 and 2 */
StrobeDetected = 0x04,
StrobeNotDetected = 0x06,
/* bits 3 and 4 */
ModeCompulsoryFiring = 0x08,
ModeCompulsorySuppression = 0x10,
ModeAuto = 0x18,
/* bit 5 */
FlashNotPresent = 0x20,
/* bit 6 */
RedEye = 0x40,
};
enum WhiteBalance {
Auto = 0,
Manual = 1,
};
enum StringEncoding {
NoEncoding = 0,
ASCII = 1,
Unicode = 2,
};
void setMake(const std::string &make);
void setModel(const std::string &model);
void setOrientation(int orientation);
void setSize(const libcamera::Size &size);
void setThumbnail(std::vector<unsigned char> &&thumbnail,
Compression compression);
void setTimestamp(time_t timestamp, std::chrono::milliseconds msec);
void setGPSDateTimestamp(time_t timestamp);
void setGPSLocation(const double *coords);
void setGPSMethod(const std::string &method);
void setFocalLength(float length);
void setExposureTime(uint64_t nsec);
void setAperture(float size);
void setISO(uint16_t iso);
void setFlash(Flash flash);
void setWhiteBalance(WhiteBalance wb);
libcamera::Span<const uint8_t> data() const { return { exifData_, size_ }; }
[[nodiscard]] int generate();
private:
ExifEntry *createEntry(ExifIfd ifd, ExifTag tag);
ExifEntry *createEntry(ExifIfd ifd, ExifTag tag, ExifFormat format,
unsigned long components, unsigned int size);
void setByte(ExifIfd ifd, ExifTag tag, uint8_t item);
void setShort(ExifIfd ifd, ExifTag tag, uint16_t item);
void setLong(ExifIfd ifd, ExifTag tag, uint32_t item);
void setString(ExifIfd ifd, ExifTag tag, ExifFormat format,
const std::string &item,
StringEncoding encoding = NoEncoding);
void setRational(ExifIfd ifd, ExifTag tag, ExifRational item);
void setRational(ExifIfd ifd, ExifTag tag,
libcamera::Span<const ExifRational> items);
std::tuple<int, int, int> degreesToDMS(double decimalDegrees);
void setGPSDMS(ExifIfd ifd, ExifTag tag, int deg, int min, int sec);
std::u16string utf8ToUtf16(const std::string &str);
bool valid_;
ExifData *data_;
ExifMem *mem_;
ExifByteOrder order_;
unsigned char *exifData_;
unsigned int size_;
std::vector<unsigned char> thumbnailData_;
};
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