修复麦克风关闭和开启做串行执行。并行会出现麦克风没关闭的情况

local_plugins/azure_speech/ios/azure_speech/Sources/azure_speech/AzureAsrHelper.swift

@@ -41,6 +41,11 @@ public class AzureAsrHelper: NSObject {
     private var lastAudioStartTime: Int64 = 0
     private let audioOperationDebounceInterval: Int64 = 500 // 500毫秒防抖间隔
     private var audioStartWorkItem: DispatchWorkItem?
+    // 串行队列和状态标记，用于顺序控制音频启动/停止，避免竞态
+    private let audioOpQueue = DispatchQueue(label: "com.azure.speech.audio.operations")
+    private var isAudioStarting = false
+    private var isAudioStarted = false
+    private var pendingStopRequest = false
     
     // 状态管理
     private var _isContinuousRecognitionActive = false
@@ -269,9 +274,27 @@ public class AzureAsrHelper: NSObject {
         
         os_log("开始异步启动音频录制", log: self.log, type: .info)
         
-        // 在后台队列执行耗时的音频启动操作
-        DispatchQueue.global(qos: .userInitiated).async {
+        // 使用串行队列，保证与 stop 顺序执行，避免竞态
+        self.audioOpQueue.async { [weak self] in
+            guard let self = self else {
+                DispatchQueue.main.async { completion(false) }
+                return
+            }
+            
+            // 准备启动
+            self.isAudioStarting = true
+            self.pendingStopRequest = false  // 启动前清空旧的停止请求
             let success = self.performAudioStart(audioSourceType: audioSourceType, audioDataCallback: audioDataCallback)
+            self.isAudioStarting = false
+            self.isAudioStarted = success
+            
+            // 如果启动过程中有 stop 请求，立即顺序停止，确保麦克风不会被重新“开启”
+            if self.pendingStopRequest {
+                self.pendingStopRequest = false
+                _ = self.performAudioStop()
+                self.isAudioStarted = false
+                os_log("启动完成后检测到待停止请求，已立即停止音频", log: self.log, type: .info)
+            }
             
             // 回到主队列执行完成回调
             DispatchQueue.main.async {
@@ -318,9 +341,18 @@ public class AzureAsrHelper: NSObject {
     private func stopAudioRecordAsync(completion: @escaping (Bool) -> Void) {
         os_log("开始立即停止音频录制", log: log, type: .info)
         
-        // 在后台队列执行耗时的音频停止操作
-        DispatchQueue.global(qos: .userInitiated).async {
+        // 在串行队列顺序执行停止，避免与启动并发导致的竞态
+        audioOpQueue.async { [weak self] in
+            guard let self = self else {
+                DispatchQueue.main.async { completion(false) }
+                return
+            }
+            // 若启动过程中收到停止请求，记录标记，启动完成后会立即停止
+            if self.isAudioStarting {
+                self.pendingStopRequest = true
+            }
             let success = self.performAudioStop()
+            self.isAudioStarted = false
             
             // 回到主队列执行完成回调
             DispatchQueue.main.async {
@@ -333,7 +365,7 @@ public class AzureAsrHelper: NSObject {
      * 执行音频停止操作
      */
     private func performAudioStop() -> Bool {
-        do {
+        do { 
             audioStream?.stopMicrophoneCapture()
             os_log("音频录制停止成功", log: log, type: .info)
             return true

local_plugins/azure_speech/ios/azure_speech/Sources/tools/SimpleAudioReceiver.swift

@@ -324,7 +324,6 @@ public func restoreOriginalAudioState() {
     
     
     public func stopMicrophoneCapture() {
-        guard _isWriting==true else { return }
        
         _isWriting=false
         micCapture.stopCapture()