新增景区排队管理功能
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//
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// ScenicQueueTTSManager.swift
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// suixinkan
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//
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import AVFoundation
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import Foundation
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/// 排队语音播报服务协议，隔离具体 TTS SDK。
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protocol ScenicQueueTTSManaging: AnyObject {
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/// 自定义文案是否正在循环播报。
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var customTextLooping: Bool { get }
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/// 预热排队 TTS 引擎。
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func prepareQueueTTSEngine(api: ScenicQueueAPI?) async
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/// 开始循环播报指定排号。
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func startQueueCallLoop(queueNo: String)
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/// 停止叫号循环。
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func stopQueueCallLoop()
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/// 单次播报普通文本。
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@discardableResult
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func speakPlainTextOnce(_ text: String) async -> Bool
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/// 开始循环播报自定义文本。
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@discardableResult
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func startCustomTextLoop(_ text: String) async -> Bool
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/// 停止自定义文本循环。
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func stopCustomTextLoop()
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/// 中断拍摄倒计时等临时播报。
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func interruptShootingAnnouncement()
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/// 估算播报耗时。
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func estimateAnnouncementDurationMillis(_ text: String) -> Int64
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}
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/// 阿里云 NLS TTS 管理器。
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///
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/// 当前工程未随仓库提供阿里云 iOS NativeNui SDK，类中保留 STS/NLS 预热链路与 SDK 桥接边界；
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/// 在 SDK framework 加入后可在 `prepareNativeEngineIfAvailable` 内完成真实 NativeNui 初始化。
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final class AliyunNLSTTSManager: NSObject, ScenicQueueTTSManaging, AVSpeechSynthesizerDelegate {
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static let shared = AliyunNLSTTSManager()
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private enum LoopKind {
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case queueCall(String)
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case custom(String)
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}
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private let synthesizer = AVSpeechSynthesizer()
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private let loopQueue = DispatchQueue(label: "com.zhifly.suixinkan.scenicQueue.tts")
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private var activeLoop: LoopKind?
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private var currentContinuation: CheckedContinuation<Void, Never>?
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private var nlsToken: String?
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private var lastCredentials: AliyunOSSCredentials?
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private(set) var customTextLooping = false
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override init() {
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super.init()
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synthesizer.delegate = self
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}
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func prepareQueueTTSEngine(api: ScenicQueueAPI?) async {
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guard let api else { return }
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do {
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let sts = try await api.aliyunSTS(bucket: "vipsky")
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lastCredentials = sts.credentials
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nlsToken = nil
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prepareNativeEngineIfAvailable(credentials: sts.credentials)
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} catch {
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// Voice playback falls back to AVSpeechSynthesizer if NLS warm-up fails.
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}
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}
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func startQueueCallLoop(queueNo: String) {
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let text = Self.callAnnouncementText(queueNo: queueNo)
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loopQueue.async { [weak self] in
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guard let self else { return }
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self.activeLoop = .queueCall(queueNo)
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self.customTextLooping = false
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Task { await self.runLoop(text: text, expected: .queueCall(queueNo)) }
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}
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}
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func stopQueueCallLoop() {
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loopQueue.async { [weak self] in
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guard let self else { return }
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if case .queueCall = self.activeLoop {
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self.activeLoop = nil
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}
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self.stopSpeaking()
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}
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}
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@discardableResult
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func speakPlainTextOnce(_ text: String) async -> Bool {
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let trimmed = text.trimmingCharacters(in: .whitespacesAndNewlines)
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guard !trimmed.isEmpty else { return false }
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await speak(trimmed)
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return true
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}
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@discardableResult
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func startCustomTextLoop(_ text: String) async -> Bool {
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let trimmed = text.trimmingCharacters(in: .whitespacesAndNewlines)
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guard !trimmed.isEmpty else { return false }
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loopQueue.async { [weak self] in
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guard let self else { return }
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self.activeLoop = .custom(trimmed)
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self.customTextLooping = true
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Task { await self.runLoop(text: trimmed, expected: .custom(trimmed)) }
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}
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return true
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}
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func stopCustomTextLoop() {
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loopQueue.async { [weak self] in
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guard let self else { return }
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if case .custom = self.activeLoop {
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self.activeLoop = nil
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}
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self.customTextLooping = false
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self.stopSpeaking()
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}
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}
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func interruptShootingAnnouncement() {
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stopSpeaking()
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}
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func estimateAnnouncementDurationMillis(_ text: String) -> Int64 {
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let count = max(1, text.count)
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return Int64(min(max(850 + count * 200, 900), 12_000))
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}
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/// 排队号 TTS 格式化，降低字母数字连读概率。
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static func formatQueueNoForTTS(_ queueNo: String) -> String {
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let trimmed = queueNo.trimmingCharacters(in: .whitespacesAndNewlines)
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let core = trimmed.hasSuffix("号") ? String(trimmed.dropLast()) : trimmed
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guard !core.isEmpty else { return trimmed.isEmpty ? "请" : trimmed }
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let pattern = #"^([A-Za-z]+)([0-9]+)$"#
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if let regex = try? NSRegularExpression(pattern: pattern),
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let match = regex.firstMatch(in: core, range: NSRange(core.startIndex..., in: core)),
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let lettersRange = Range(match.range(at: 1), in: core),
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let digitsRange = Range(match.range(at: 2), in: core) {
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return "\(core[lettersRange].uppercased())，\(core[digitsRange])号"
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}
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return "\(core)号"
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}
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/// 叫号播报文案。
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static func callAnnouncementText(queueNo: String) -> String {
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"\(formatQueueNoForTTS(queueNo))，请到拍摄区域，准备拍摄。"
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}
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private func runLoop(text: String, expected: LoopKind) async {
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while isLoopStillActive(expected) {
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await speak(text)
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guard isLoopStillActive(expected) else { break }
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try? await Task.sleep(nanoseconds: 1_000_000_000)
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}
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if case .custom = expected {
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customTextLooping = false
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}
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}
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private func isLoopStillActive(_ expected: LoopKind) -> Bool {
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loopQueue.sync {
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switch (activeLoop, expected) {
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case (.queueCall(let lhs), .queueCall(let rhs)):
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lhs == rhs
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case (.custom(let lhs), .custom(let rhs)):
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lhs == rhs
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default:
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false
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}
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}
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}
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private func speak(_ text: String) async {
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await MainActor.run {
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if synthesizer.isSpeaking {
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synthesizer.stopSpeaking(at: .immediate)
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}
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}
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await withCheckedContinuation { continuation in
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currentContinuation = continuation
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let utterance = AVSpeechUtterance(string: text)
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utterance.voice = AVSpeechSynthesisVoice(language: "zh-CN")
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utterance.rate = AVSpeechUtteranceDefaultSpeechRate * 0.86
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utterance.volume = 1.0
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DispatchQueue.main.async {
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self.synthesizer.speak(utterance)
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}
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}
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}
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private func stopSpeaking() {
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DispatchQueue.main.async {
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if self.synthesizer.isSpeaking {
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self.synthesizer.stopSpeaking(at: .immediate)
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}
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self.resumeCurrentContinuationIfNeeded()
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}
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}
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private func resumeCurrentContinuationIfNeeded() {
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currentContinuation?.resume()
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currentContinuation = nil
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}
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func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didFinish utterance: AVSpeechUtterance) {
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resumeCurrentContinuationIfNeeded()
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}
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func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didCancel utterance: AVSpeechUtterance) {
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resumeCurrentContinuationIfNeeded()
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}
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private func prepareNativeEngineIfAvailable(credentials: AliyunOSSCredentials) {
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_ = NSClassFromString("NativeNui")
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_ = credentials
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}
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}
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