299415a530
- 添加 PRD、技术规范、交互规范文档 (V0.2) - 创建 Swift Package 和 Xcode 项目 - 实现 LivePhotoCore 基础模块 - 添加 HEIC MakerNote 元数据写入功能 - 创建项目结构文档和任务清单 - 添加 .gitignore 忽略规则
84 lines
5.2 KiB
Swift
84 lines
5.2 KiB
Swift
import Foundation
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/// 用于修复 HEIC 文件中的 Apple MakerNotes，添加 LivePhotoVideoIndex 字段
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/// CGImageDestination 无法正确写入 Int64 类型的 MakerNotes 字段，
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/// 所以我们使用预制的模板并在运行时替换关键字段
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public struct MakerNotesPatcher {
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// MARK: - 模板中的偏移量（基于原生 iPhone 照片的 MakerNotes 分析）
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/// ContentIdentifier 在 MakerNotes 模板中的偏移（36 字节 ASCII UUID + null）
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private static let contentIdentifierOffset = 0x580 // 1408
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private static let contentIdentifierLength = 36
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/// LivePhotoVideoIndex 在 MakerNotes 模板中的偏移（8 字节 Big-Endian Int64）
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private static let livePhotoVideoIndexOffset = 0x5a6 // 1446
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private static let livePhotoVideoIndexLength = 8
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/// 原生 iPhone MakerNotes 模板（从 iPhone 13 Pro Max 拍摄的 Live Photo 提取）
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/// 包含完整的 Apple MakerNotes 结构，需要替换 ContentIdentifier 和 LivePhotoVideoIndex
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private static let makerNotesTemplate: Data = {
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// Base64 编码的 MakerNotes 模板
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let base64 = """
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QXBwbGUgaU9TAAABTU0APQABAAkAAAABAAAAEAACAAcAAAIAAAAC8AADAAcAAABoAAAE8AAEAAkA\
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AAABAAAAAQAFAAkAAAABAAAAqQAGAAkAAAABAAAApQAHAAkAAAABAAAAAQAIAAoAAAADAAAFWAAM\
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AAoAAAACAAAFcAANAAkAAAABAAAAFwAOAAkAAAABAAAABAAQAAkAAAABAAAAAQARAAIAAAAlAAAF\
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gAAUAAkAAAABAAAACgAXABAAAAABAAAFpgAZAAkAAAABAAAAAgAaAAIAAAAGAAAFrgAfAAkAAAAB\
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AAAAAAAgAAIAAAAlAAAFtAAhAAoAAAABAAAF2gAjAAkAAAACAAAF4gAlABAAAAABAAAF6gAmAAkA\
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AAABAAAAAwAnAAoAAAABAAAF8gAoAAkAAAABAAAAAQArAAIAAAAlAAAF+gAtAAkAAAABAAATXAAu\
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AAkAAAABAAAAAQAvAAkAAAABAAAAMAAwAAoAAAABAAAGIAAzAAkAAAABAAAQAAA0AAkAAAABAAAA\
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BAA1AAkAAAABAAAAAwA2AAkAAAABAADnJAA3AAkAAAABAAAABAA4AAkAAAABAAACPgA5AAkAAAAB\
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AAAAAAA6AAkAAAABAAAAAAA7AAkAAAABAAAAAAA8AAkAAAABAAAABAA9AAkAAAABAAAAAAA/AAkA\
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AAABAAAAOwBAAAcAAABQAAAGKABBAAkAAAABAAAAAABCAAkAAAABAAAAAABDAAkAAAABAAAAAABE\
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AAkAAAABAAAAAABFAAkAAAABAAAAAABGAAkAAAABAAAAAABIAAkAAAABAAACPgBJAAkAAAABAAAA\
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AABKAAkAAAABAAAAAgBNAAoAAAABAAAGeABOAAcAAAB5AAAGgABPAAcAAAArAAAG+gBSAAkAAAAB\
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AAAAAQBTAAkAAAABAAAAAQBVAAkAAAABAAAAAQBYAAkAAAABAAAHAwBgAAkAAAABAAASAABhAAkA\
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AAABAAAAGgAAAAC9AtMCxAKWAlsCIALqAbwBkgFrAUYBJQEIAfEA3QDMAAMDMwNAA/QCmQJWAg0C\
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1QGoAX4BUwEtAQ8B9QDhAM0ALANqA2oDTAPrAnUCKALpAb4BhgFWATABEAH0AN4AyQA9A7oDwgNP\
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A7gCXAIYAugBqwF2AUwBJgEGAeoA0gC+ANECrwPSAxIDZAIVAt4BqwF8AVABKQEHAekA0AC6AKgA\
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zwFCAnYCBAK/AZYBcwFQAS8BDQHvANQAvQCpAJgAigDUAP8AGgEVARoB5QC6AMUAsACsAJkAggBy\
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AGQAXABTAGAAaABqAGYAXABMAEcARwBCAEEAPgAvACQAJAAlACoARgBIAEcARAA/ADcAMwAvACoA\
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KAAnACEAHQAfAB8AIAAxADIAMQAwAC4AKwAnACcAJQAfABwAGgAXABkAEwAUACkAKgAmACQAIgAg\
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ACEAIgAgAB4AHAAZABgAFAAXABUAIgAcABoAGwAaABcAHAAdABkAGAAYABgAFwAaABgAGAAaABsA\
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GgAYABUAEwAWABcAEwAWABcAFQAVABYAEwAUABoAFwAWABMAEgATABAADwATABMAEgANAA8ADwAP\
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AAwAEwAVABIAEwANABUAEwATABIADAAPAAsAEAASAA8ADgARABEADwAMAAwADwAWABMAEgASABQA\
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DQAPAAoADAAOAGJwbGlzdDAw1AECAwQFBgcIVWZsYWdzVXZhbHVlWXRpbWVzY2FsZVVlcG9jaBAB\
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EwABVEUBR7fxEjuaygAQAAgRFx0nLS84PQAAAAAAAAEBAAAAAAAAAAkAAAAAAAAAAAAAAAAAAAA/\
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///J3gAANk3//8R4AAe+////5bUAAVy+AAAAOwAAAQAAAAAnAAABAAAAAAAAAAAAAAAAAAAAALtA\
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABI\
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RUlDAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAbwBwAGwAaQBzAHQAMAAwANQBAgMEBQYHCFEzUTFR\
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MlEwEAQiAAAAACQ/AAAAEAEIERMVFxkbICUAAAAAAAABAQAAAAAAAAAJAAAAAAAAAAAAAAAAAAAA\
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JwAC8/UAABV+YnBsaXN0MDDSAQIDSFExUTIQA6IFCtIGBwgJUzIuMVMyLjIjQEsf2IAAAACJQAAA\
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AAAAAADSBgcLDCM/4hqAAAAAAKNAVMAAAAAAAAgNDxETFhsfIywlOkMAAAAAAAABAQAAAAAAAAAL\
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AAAAAAAAAAAAAAAAAAAAQQAAAAA=
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"""
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return Data(base64Encoded: base64.replacingOccurrences(of: "\\\n", with: "").replacingOccurrences(of: "\n", with: ""))!
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}()
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/// 创建自定义的 MakerNotes 数据
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/// - Parameters:
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/// - contentIdentifier: Live Photo 的 Content Identifier (UUID 字符串格式)
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/// - livePhotoVideoIndex: Live Photo Video Index (通常是帧索引的 Float32 bitPattern)
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/// - Returns: 修改后的 MakerNotes 数据
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public static func createMakerNotes(
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contentIdentifier: String,
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livePhotoVideoIndex: Int64
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) -> Data {
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var data = makerNotesTemplate
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// 替换 ContentIdentifier
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let uuidData = contentIdentifier.data(using: .ascii)!
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let paddedUUID = uuidData + Data(repeating: 0, count: max(0, contentIdentifierLength - uuidData.count))
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data.replaceSubrange(contentIdentifierOffset..<(contentIdentifierOffset + contentIdentifierLength), with: paddedUUID.prefix(contentIdentifierLength))
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// 替换 LivePhotoVideoIndex (Big-Endian)
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var bigEndianValue = UInt64(bitPattern: livePhotoVideoIndex).bigEndian
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let indexData = Data(bytes: &bigEndianValue, count: livePhotoVideoIndexLength)
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data.replaceSubrange(livePhotoVideoIndexOffset..<(livePhotoVideoIndexOffset + livePhotoVideoIndexLength), with: indexData)
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return data
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}
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}
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