import Foundation
import MicrosoftCognitiveServicesSpeech
import AVFoundation
import AudioToolbox

/// Azure ASR工具类，负责实现语音识别服务接口
@available(iOS 13.0, *)
class AzureAsrHelper: NSObject {
    // MARK: - 属性
    
    /// 事件处理回调
    private var eventHandler: (String, [String: Any]) -> Void
    
    /// 语音配置信息
    private var speechSubscriptionKey: String = ""
    private var serviceRegion: String = ""
    
    /// 语音识别相关
    private var speechConfig: SPXSpeechConfiguration?
    private var recognizer: SPXSpeechRecognizer?
    private var audioConfig: SPXAudioConfiguration?
    private var pushStream: SPXPushAudioInputStream?
    
    /// 音频处理相关
    private var audioProcessor: CustomAudioProcessor?
    private var isProcessingAudio = false
    private var audioProcessingTimer: Timer?
    
    /// 状态标志
    private var isInitialized = false
    private var _isContinuousRecognitionActive = false
    
    /// 当前语言和支持的语言
    private var currentLanguage = "zh-CN"
    private var supportedLanguages: [String] = ["zh-CN", "en-US"]
    private var isAutoDetectLanguage = false
    
    // MARK: - 初始化
    
    init(eventHandler: @escaping (String, [String: Any]) -> Void) {
        self.eventHandler = eventHandler
        super.init()
    }
    
    deinit {
        dispose()
    }
    
    // MARK: - ASR Service 接口实现
    
    /// 初始化语音识别服务
    /// - Parameters:
    ///   - speechSubscriptionKey: Azure 语音服务订阅密钥
    ///   - serviceRegion: Azure 服务区域 (如 eastasia)
    ///   - supportedLanguages: 支持的语言代码数组 (可选)
    /// - Returns: 初始化是否成功
    func initialize(speechSubscriptionKey: String, serviceRegion: String, supportedLanguages: [String]? = nil) -> Bool {
        print("[AzureAsrHelper] 初始化 Azure 语音服务")
        
        // 检查配置是否为空
        if speechSubscriptionKey.isEmpty || serviceRegion.isEmpty {
            print("[AzureAsrHelper] 错误: Azure 配置信息不完整")
            eventHandler("error", ["message": "Azure 配置信息不完整"])
            return false
        }
        
        // 释放之前的资源
        dispose()
        
        // 记录配置信息
        self.speechSubscriptionKey = speechSubscriptionKey
        self.serviceRegion = serviceRegion
        
        // 设置语言
        if let languages = supportedLanguages, !languages.isEmpty {
            self.supportedLanguages = languages
        }
        
        // 根据支持的语言数量决定是否启用自动语言检测
        isAutoDetectLanguage = self.supportedLanguages.count >= 2
        
        // 如果只有一种语言，设置为当前语言
        if !isAutoDetectLanguage && !self.supportedLanguages.isEmpty {
            currentLanguage = self.supportedLanguages[0]
        }
        
        // 创建识别器和设置回调
        if !createRecognizerAndSetupCallbacks() {
            return false
        }
        
        print("[AzureAsrHelper] Azure 语音服务初始化成功")
        isInitialized = true
        return true
    }
    
    /// 创建识别器并设置回调
    private func createRecognizerAndSetupCallbacks() -> Bool {
        // 释放之前的 recognizer
        recognizer = nil
        audioConfig = nil
        
        do {
            // 创建语音配置
            speechConfig = try SPXSpeechConfiguration(subscription: speechSubscriptionKey, region: serviceRegion)
            
            // 设置音频输入参数
            try setupAudioSession()
            
            // 创建自定义推送流，替代默认的麦克风输入
            pushStream = try SPXPushAudioInputStream()
            audioConfig = try SPXAudioConfiguration(streamInput: pushStream!)
            
            // 初始化自定义音频处理器
            audioProcessor = CustomAudioProcessor()
            
            // 设置语言配置
            if isAutoDetectLanguage {
                // 设置自动语言检测
                speechConfig?.setPropertyTo("Continuous", by: SPXPropertyId.speechServiceConnectionLanguageIdMode)
                
                // 创建自动语言检测配置
                let autoDetectSourceLanguageConfig = try SPXAutoDetectSourceLanguageConfiguration(supportedLanguages)
                
                // 创建识别器
                recognizer = try SPXSpeechRecognizer(
                    speechConfiguration: speechConfig!, 
                    autoDetectSourceLanguageConfiguration: autoDetectSourceLanguageConfig,
                    audioConfiguration: audioConfig!
                )
            } else {
                // 设置指定的识别语言
                speechConfig?.speechRecognitionLanguage = currentLanguage
                
                // 创建识别器
                recognizer = try SPXSpeechRecognizer(speechConfiguration: speechConfig!, audioConfiguration: audioConfig!)
            }
            
            // 设置所有回调
            setupAllCallbacks()
            
            return true
        } catch {
            print("[AzureAsrHelper] 错误: 创建识别器失败: \(error.localizedDescription)")
            eventHandler("error", ["message": "创建识别器失败: \(error.localizedDescription)"])
            return false
        }
    }
    
    /// 设置音频会话
    private func setupAudioSession() throws {
        let audioSession = AVAudioSession.sharedInstance()
        
        // 使用playAndRecord类别允许同时录音和播放
        try audioSession.setCategory(.playAndRecord, 
                                    mode: .voiceChat,  // 使用voiceChat模式能够更好地支持回音消除
                                    options: [.allowBluetooth, .defaultToSpeaker, .allowAirPlay, .mixWithOthers])
        
        // 设置首选的输入和输出
        let currentRoute = audioSession.currentRoute
        
        // 获取当前是否连接了耳机或外部麦克风
        let hasHeadphones = currentRoute.outputs.contains { 
            $0.portType == .headphones || $0.portType == .bluetoothA2DP || $0.portType == .bluetoothHFP 
        }
        
        // 如果没有耳机，明确启用内置麦克风和扬声器的回音消除
        if !hasHeadphones {
            try audioSession.setMode(.voiceChat)  // 语音聊天模式有更强的回音消除
            
            // 启用回音消除和噪声抑制
            try audioSession.setInputGain(0.8)  // 适当降低输入增益以减少扬声器音频被麦克风捕获的可能性
        } else {
            // 耳机模式，可以使用不同的设置
            try audioSession.setMode(.voiceChat)
            try audioSession.setInputGain(1.0)
        }
        
        // 设置合适的采样率
        try audioSession.setPreferredSampleRate(16000.0)  // Azure语音识别推荐的采样率
        try audioSession.setPreferredIOBufferDuration(0.01)  // 较小的缓冲区大小以减少延迟
        
        // 激活音频会话
        try audioSession.setActive(true, options: .notifyOthersOnDeactivation)
        
        print("[AzureAsrHelper] 音频会话配置成功，已启用回音消除")
    }
    
    /// 设置所有回调
    private func setupAllCallbacks() {
        guard let recognizer = recognizer else { return }
        
        // 最终识别结果
        recognizer.addRecognizedEventHandler { [weak self] _, event in
            guard let self = self else { return }
            
            if event.result.reason == SPXResultReason.recognizedSpeech {
                let detectedLanguage = self.getDetectedLanguage(from: event.result)
                print("[AzureAsrHelper] 识别结果: \(event.result.text ?? ""), 语言: \(detectedLanguage)")
                self.eventHandler("result", [
                    "text": event.result.text ?? "",
                    "detectedLanguage": detectedLanguage
                ])
            }
        }
        
        // 识别中事件
        recognizer.addRecognizingEventHandler { [weak self] _, event in
            guard let self = self else { return }
            
            if event.result.reason == SPXResultReason.recognizingSpeech {
                let detectedLanguage = self.getDetectedLanguage(from: event.result)
                // print("[AzureAsrHelper] 识别中: \(event.result.text ?? ""), 语言: \(detectedLanguage)")
                self.eventHandler("recognizing", [
                    "text": event.result.text ?? "",
                    "detectedLanguage": detectedLanguage
                ])
            }
        }
        
        // 会话事件
        recognizer.addSessionStartedEventHandler { [weak self] _, _ in
            guard let self = self else { return }
            
            print("[AzureAsrHelper] 识别会话已开始")
            self._isContinuousRecognitionActive = true
            self.eventHandler("sessionStarted", [:])
        }
        
        recognizer.addSessionStoppedEventHandler { [weak self] _, _ in
            guard let self = self else { return }
            
            print("[AzureAsrHelper] 识别会话已结束")
            self._isContinuousRecognitionActive = false
            self.eventHandler("sessionStopped", [:])
        }
        
        // 取消事件
        recognizer.addCanceledEventHandler { [weak self] _, event in
            guard let self = self else { return }
            
            let reason = event.reason.rawValue
            let errorDetails = event.errorDetails ?? "未知错误"
            
            print("[AzureAsrHelper] 识别取消: \(errorDetails)")
            
            self.eventHandler("canceled", [
                "reason": reason,
                "errorDetails": errorDetails
            ])
            
            self._isContinuousRecognitionActive = false
        }
    }
    
    /// 执行一次性语音识别
    /// - Returns: 是否成功启动识别
    func recognizeOnce() -> Bool {
        if !isInitialized {
            print("[AzureAsrHelper] 错误: 语音服务未初始化")
            eventHandler("error", ["message": "语音服务未初始化"])
            return false
        }
        
        // 如果正在连续识别，先停止
        if _isContinuousRecognitionActive {
            stopContinuousRecognition()
        }
        
        // 确保识别器已创建
        if recognizer == nil && !createRecognizerAndSetupCallbacks() {
            return false
        }
        
        do {
            // 启动音频处理
            startAudioProcessing()
            
            // 通知会话开始
            eventHandler("sessionStarted", [:])
            
            // 执行识别
            try recognizer?.recognizeOnceAsync { [weak self] result in
                guard let self = self else { return }
                
                // 停止音频处理
                self.stopAudioProcessing()
                
                if result.reason == SPXResultReason.recognizedSpeech {
                    let detectedLanguage = self.getDetectedLanguage(from: result)
                    self.eventHandler("result", [
                        "text": result.text ?? "",
                        "detectedLanguage": detectedLanguage
                    ])
                } else if result.reason == SPXResultReason.noMatch {
                    print("[AzureAsrHelper] 无匹配结果")
                    self.eventHandler("noMatch", [:])
                } else if result.reason == SPXResultReason.canceled {
                    do {
                        let details = try SPXCancellationDetails(fromCanceledRecognitionResult: result)
                        let errorDetails = details.errorDetails ?? "未知错误"
                        self.eventHandler("error", ["message": "识别取消: \(errorDetails)"])
                    } catch {
                        print("[AzureAsrHelper] 错误: 获取取消详情失败: \(error.localizedDescription)")
                        self.eventHandler("error", ["message": "识别取消，无法获取详细原因"])
                    }
                }
            }
            
            return true
        } catch {
            print("[AzureAsrHelper] 错误: 识别异常: \(error.localizedDescription)")
            eventHandler("error", ["message": "识别异常: \(error.localizedDescription)"])
            stopAudioProcessing()
            return false
        }
    }
    
    /// 开始连续语音识别
    /// - Returns: 是否成功启动识别
    func startContinuousRecognition() -> Bool {
        if !isInitialized {
            print("[AzureAsrHelper] 错误: 语音服务未初始化")
            eventHandler("error", ["message": "语音服务未初始化"])
            return false
        }
        
        // 如果已经在进行连续识别，先停止
        if _isContinuousRecognitionActive {
            stopContinuousRecognition()
        }
        
        // 确保识别器已创建
        if recognizer == nil && !createRecognizerAndSetupCallbacks() {
            return false
        }
        
        // 重新确保音频设置正确
        do {
            try setupAudioSession()
        } catch {
            print("[AzureAsrHelper] 警告: 设置音频会话失败: \(error.localizedDescription)")
        }
        
        do {
            // 启动音频处理
            startAudioProcessing()
            
            // 启动连续识别
            try recognizer?.startContinuousRecognition()
            _isContinuousRecognitionActive = true
            
            print("[AzureAsrHelper] 连续识别开始")
            return true
        } catch {
            print("[AzureAsrHelper] 错误: 开始连续识别失败: \(error.localizedDescription)")
            eventHandler("error", ["message": "开始连续识别失败: \(error.localizedDescription)"])
            _isContinuousRecognitionActive = false
            stopAudioProcessing()
            return false
        }
    }
    
    /// 停止连续语音识别
    /// - Returns: 是否成功停止识别
    func stopContinuousRecognition() -> Bool {
        // 停止音频处理
        stopAudioProcessing()
        
        if !_isContinuousRecognitionActive || recognizer == nil {
            return true
        }
        
        do {
            try recognizer?.stopContinuousRecognition()
            _isContinuousRecognitionActive = false
            print("[AzureAsrHelper] 连续识别已停止")
            return true
        } catch {
            print("[AzureAsrHelper] 错误: 停止连续识别失败: \(error.localizedDescription)")
            eventHandler("error", ["message": "停止连续识别失败: \(error.localizedDescription)"])
            _isContinuousRecognitionActive = false
            return false
        }
    }
    
    /// 检查连续识别是否活跃
    /// - Returns: 连续识别是否处于活跃状态
    func isContinuousRecognitionActive() -> Bool {
        return _isContinuousRecognitionActive
    }
    
    /// 释放资源
    func dispose() {
        print("[AzureAsrHelper] 释放资源")
        
        // 停止音频处理
        stopAudioProcessing()
        
        // 停止连续识别
        if _isContinuousRecognitionActive {
            stopContinuousRecognition()
        }
        
        // 释放音频会话
        do {
            try AVAudioSession.sharedInstance().setActive(false, options: .notifyOthersOnDeactivation)
        } catch {
            print("[AzureAsrHelper] 警告: 释放音频会话失败: \(error.localizedDescription)")
        }
        
        // 释放资源
        recognizer = nil
        speechConfig = nil
        audioConfig = nil
        pushStream = nil
        audioProcessor = nil
        
        // 重置状态
        _isContinuousRecognitionActive = false
        isInitialized = false
    }
    
    /// 从结果中获取检测到的语言
    private func getDetectedLanguage(from result: SPXSpeechRecognitionResult) -> String {
        if isAutoDetectLanguage {
            do {
                let langResult = try SPXAutoDetectSourceLanguageResult(result)
                return langResult.language ?? currentLanguage
            } catch {
                print("[AzureAsrHelper] 错误: 获取检测到的语言失败: \(error.localizedDescription)")
                return currentLanguage
            }
        } else {
            return currentLanguage
        }
    }
    
    // MARK: - 音频处理
    
    /// 开始音频处理
    private func startAudioProcessing() {
        guard !isProcessingAudio, let audioProcessor = audioProcessor else { return }
        
        isProcessingAudio = true
        
        // 启动音频处理器
        if !audioProcessor.startRecord() {
            print("[AzureAsrHelper] 错误: 启动音频处理器失败")
            eventHandler("error", ["message": "启动音频处理器失败"])
            return
        }
        
        // 启动音频处理定时器
        audioProcessingTimer = Timer.scheduledTimer(withTimeInterval: 0.08, repeats: true) { [weak self] _ in
            guard let self = self, self.isProcessingAudio, let processor = self.audioProcessor, let stream = self.pushStream else {
                return
            }
            
            // 读取处理后的音频数据
            var bytes = [UInt8](repeating: 0, count: 2560)
            let bytesRead = processor.read(bytes: &bytes)
            
            if bytesRead > 0 {
                // 推送数据到Azure语音服务
                let data = Data(bytes: bytes, count: bytesRead)
                stream.write(data)
                
                // 通知音频数据可用
                self.eventHandler("audioData", ["data": bytes])
            }
        }
        
        print("[AzureAsrHelper] 音频处理已启动")
    }
    
    /// 停止音频处理
    private func stopAudioProcessing() {
        // 停止定时器
        audioProcessingTimer?.invalidate()
        audioProcessingTimer = nil
        
        // 停止音频处理器
        audioProcessor?.stopRecord()
        
        isProcessingAudio = false
        print("[AzureAsrHelper] 音频处理已停止")
    }
}

// MARK: - 自定义音频处理器

@available(iOS 13.0, *)
class CustomAudioProcessor: NSObject {
    // 音频单元
    private var ioUnit: AudioUnit?
    
    // 音频格式
    private var audioFormat: AudioStreamBasicDescription
    
    // 音频缓冲
    private var audioBufferList: AudioBufferList
    private var audioList: [Float] = []
    private let audioListQueue = DispatchQueue(label: "audioListQueue")
    
    // 回音消除状态
    private var isEchoCancellationEnabled = true
    
    override init() {
        // 设置音频格式 - 16kHz, 16位, 单声道
        audioFormat = AudioStreamBasicDescription(
            mSampleRate: 16000.0,
            mFormatID: kAudioFormatLinearPCM,
            mFormatFlags: kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked,
            mBytesPerPacket: 2,
            mFramesPerPacket: 1,
            mBytesPerFrame: 2,
            mChannelsPerFrame: 1,
            mBitsPerChannel: 16,
            mReserved: 0
        )
        
        // 初始化音频缓冲
        audioBufferList = AudioBufferList(
            mNumberBuffers: 1,
            mBuffers: AudioBuffer(
                mNumberChannels: 1,
                mDataByteSize: 4096,
                mData: malloc(4096)
            )
        )
        
        super.init()
    }
    
    deinit {
        stopRecord()
        free(audioBufferList.mBuffers.mData)
    }
    
    /// 启动音频处理
    /// - Returns: 是否成功启动
    func startRecord() -> Bool {
        print("[CustomAudioProcessor] 配置音频单元")
        
        // 创建音频组件描述 - 使用VoiceProcessingIO类型获取回音消除
        var ioUnitDescription = AudioComponentDescription(
            componentType: kAudioUnitType_Output,
            componentSubType: kAudioUnitSubType_VoiceProcessingIO,
            componentManufacturer: kAudioUnitManufacturer_Apple,
            componentFlags: 0,
            componentFlagsMask: 0
        )
        
        // 查找音频组件
        guard let ioUnitRef = AudioComponentFindNext(nil, &ioUnitDescription) else {
            print("[CustomAudioProcessor] 错误: 未找到音频组件")
            return false
        }
        
        // 创建音频单元实例
        if checkError(AudioComponentInstanceNew(ioUnitRef, &ioUnit), "创建音频单元") {
            ioUnit = nil
            return false
        }
        
        // 启用输入端口
        var enableInput: UInt32 = 1
        let kInputBus: AudioUnitElement = 1
        let kOutputBus: AudioUnitElement = 0
        if checkError(AudioUnitSetProperty(ioUnit!, kAudioOutputUnitProperty_EnableIO,
                                          kAudioUnitScope_Input, kInputBus, &enableInput,
                                          UInt32(MemoryLayout<UInt32>.size)), "启用输入端口") {
            return false
        }
        
        // 禁用输出端口 (我们只需要输入)
        var enableOutput: UInt32 = 0
        if checkError(AudioUnitSetProperty(ioUnit!, kAudioOutputUnitProperty_EnableIO,
                                          kAudioUnitScope_Output, kOutputBus,
                                          &enableOutput, UInt32(MemoryLayout<UInt32>.size)), "禁用输出端口") {
            return false
        }
        
        // 设置缓冲区分配标志
        var flag: UInt32 = 0
        if checkError(AudioUnitSetProperty(ioUnit!, kAudioUnitProperty_ShouldAllocateBuffer,
                                          kAudioUnitScope_Output, kInputBus, &flag, UInt32(MemoryLayout<UInt32>.size)), "设置缓冲区分配标志") {
            return false
        }
        
        // 设置音频格式
        let size = UInt32(MemoryLayout<AudioStreamBasicDescription>.size)
        if checkError(AudioUnitSetProperty(ioUnit!, kAudioUnitProperty_StreamFormat,
                                          kAudioUnitScope_Output, kInputBus, &audioFormat, size), "设置输入总线输出范围的流格式") {
            return false
        }
        
        if checkError(AudioUnitSetProperty(ioUnit!, kAudioUnitProperty_StreamFormat,
                                          kAudioUnitScope_Input, kOutputBus, &audioFormat, size), "设置输出总线输入范围的流格式") {
            return false
        }
        
        // 启用回音消除
        if isEchoCancellationEnabled {
            var echoCancellation: UInt32 = 1
            AudioUnitSetProperty(ioUnit!, kAUVoiceIOProperty_BypassVoiceProcessing,
                                kAudioUnitScope_Global, 0, &echoCancellation, UInt32(MemoryLayout<UInt32>.size))
        }
        
        // 设置输入回调 - 当有新音频数据时调用
        var inputCallback = AURenderCallbackStruct(
            inputProc: CustomAudioProcessor.onAudioDataAvailable,
            inputProcRefCon: UnsafeMutableRawPointer(Unmanaged.passUnretained(self).toOpaque())
        )
        
        if checkError(AudioUnitSetProperty(ioUnit!,
                                          kAudioOutputUnitProperty_SetInputCallback,
                                          kAudioUnitScope_Global, kInputBus,
                                          &inputCallback, UInt32(MemoryLayout<AURenderCallbackStruct>.size)), "设置输入回调") {
            return false
        }
        
        // 初始化音频单元
        var hasError = checkError(AudioUnitInitialize(ioUnit!), "初始化音频单元")
        while hasError {
            Thread.sleep(forTimeInterval: 0.1)
            hasError = checkError(AudioUnitInitialize(ioUnit!), "初始化音频单元")
        }
        
        // 启动音频单元
        hasError = checkError(AudioOutputUnitStart(ioUnit!), "启动音频单元")
        
        print("[CustomAudioProcessor] 音频处理器已启动，回音消除\(isEchoCancellationEnabled ? "已启用" : "已禁用")")
        return !hasError
    }
    
    /// 停止音频处理
    func stopRecord() {
        print("[CustomAudioProcessor] 停止音频处理器")
        
        if let ioUnit = ioUnit {
            // 停止音频单元
            _ = checkError(AudioOutputUnitStop(ioUnit), "停止音频单元")
            
            // 关闭音频单元
            _ = checkError(AudioUnitUninitialize(ioUnit), "反初始化音频单元")
            _ = checkError(AudioComponentInstanceDispose(ioUnit), "释放音频单元")
            
            self.ioUnit = nil
        }
        
        // 清空音频数据缓冲
        audioListQueue.sync {
            audioList.removeAll()
        }
    }
    
    /// 音频数据回调 - 当有新的音频数据可用时调用
    private static let onAudioDataAvailable: AURenderCallback = { inRefCon, ioActionFlags, inTimeStamp, inBusNumber, inNumberFrames, ioData in
        // 获取实例
        let processor = Unmanaged<CustomAudioProcessor>.fromOpaque(inRefCon).takeUnretainedValue()
        
        // 计算预期数据大小
        let expectedDataByteSize = inNumberFrames * processor.audioFormat.mBytesPerFrame
        
        // 确保缓冲区足够大
        if processor.audioBufferList.mBuffers.mDataByteSize < expectedDataByteSize {
            processor.audioBufferList.mBuffers.mData = realloc(processor.audioBufferList.mBuffers.mData, Int(expectedDataByteSize))
            processor.audioBufferList.mBuffers.mDataByteSize = expectedDataByteSize
        }
        
        // 渲染音频数据
        let status = processor.checkOSStatus(AudioUnitRender(processor.ioUnit!, ioActionFlags, inTimeStamp,
                                                        inBusNumber, inNumberFrames, &processor.audioBufferList),
                                       "渲染音频数据")
        
        // 将Int16数据转换为浮点数据进行处理
        var audioDataFloat = [Float](repeating: 0.0, count: Int(inNumberFrames))
        let buffer = processor.audioBufferList.mBuffers
        let bufferData = buffer.mData!.assumingMemoryBound(to: Int16.self)
        
        for j in 0..<Int(buffer.mDataByteSize / UInt32(MemoryLayout<Int16>.size)) {
            // 归一化到[-1.0, 1.0]范围
            audioDataFloat[j] = Float(bufferData[j]) / 32768.0
        }
        
        // 应用附加处理 (如有需要)
        // processor.applyAdditionalProcessing(&audioDataFloat)
        
        // 保存处理后的数据
        if status == noErr {
            processor.audioListQueue.async {
                processor.audioList.append(contentsOf: audioDataFloat)
            }
        }
        
        return status
    }
    
    /// 读取处理后的音频数据
    /// - Parameter bytes: 输出字节数组
    /// - Returns: 读取的字节数
    func read(bytes: inout [UInt8]) -> Int {
        return audioListQueue.sync {
            // 如果没有数据，返回0
            if audioList.isEmpty {
                return 0
            }
            
            // 确保有足够的数据 (至少1280个样本)
            if audioList.count < 1280 {
                return 0
            }
            
            // 读取一帧数据 (1280个样本)
            let frameLength = 1280
            let buffer = Array(audioList.prefix(frameLength))
            audioList.removeFirst(frameLength)
            
            // 将浮点数据转回Int16格式
            var int16Data = buffer.map { Int16($0 * 32767) }
            
            // 转换为字节数组
            let data = Data(buffer: UnsafeBufferPointer(start: &int16Data, count: int16Data.count))
            bytes = [UInt8](data)
            
            // 每个样本2字节 (16位PCM)
            return frameLength * 2
        }
    }
    
    /// 检查错误并打印日志
    /// - Parameters:
    ///   - status: 操作状态
    ///   - operation: 操作描述
    /// - Returns: 是否发生错误
    private func checkError(_ status: OSStatus, _ operation: String) -> Bool {
        if status != noErr {
            print("[CustomAudioProcessor] 错误: \(operation)失败: \(status)")
            return true
        }
        return false
    }
    
    /// 检查OSStatus并返回状态
    /// - Parameters:
    ///   - status: 操作状态
    ///   - operation: 操作描述
    /// - Returns: 原始状态
    private func checkOSStatus(_ status: OSStatus, _ operation: String) -> OSStatus {
        if status != noErr {
            print("[CustomAudioProcessor] 错误: \(operation)失败: \(status)")
        }
        return status
    }
}