src/android/jpeg/exif.cpp


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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2020, Google Inc.
 *
 * exif.cpp - EXIF tag creation using libexif
 */

#include "exif.h"

#include <cmath>
#include <iomanip>
#include <map>
#include <sstream>
#include <tuple>
#include <uchar.h>

#include "libcamera/internal/log.h"
#include "libcamera/internal/utils.h"

using namespace libcamera;

LOG_DEFINE_CATEGORY(EXIF)

/*
 * List of EXIF tags that we set directly because they are not supported
 * by libexif version 0.6.21.
 */
enum class _ExifTag {
	OFFSET_TIME              = 0x9010,
	OFFSET_TIME_ORIGINAL     = 0x9011,
	OFFSET_TIME_DIGITIZED    = 0x9012,
};

/*
 * The Exif class should be instantiated and specific properties set
 * through the exposed public API.
 *
 * Once all desired properties have been set, the user shall call
 * generate() to process the entries and generate the Exif data.
 *
 * Calls to generate() must check the return code to determine if any error
 * occurred during the construction of the Exif data, and if successful the
 * data can be obtained using the data() method.
 */
Exif::Exif()
	: valid_(false), data_(nullptr), order_(EXIF_BYTE_ORDER_INTEL),
	  exifData_(0), size_(0)
{
	/* Create an ExifMem allocator to construct entries. */
	mem_ = exif_mem_new_default();
	if (!mem_) {
		LOG(EXIF, Error) << "Failed to allocate ExifMem Allocator";
		return;
	}

	data_ = exif_data_new_mem(mem_);
	if (!data_) {