修复部分手机不能回音消除的问题

local_plugins/azure_speech/android/src/main/kotlin/com/yunqiinnovation/azure_speech/AzureAsrHelper.kt

@@ -13,6 +13,10 @@ import com.microsoft.cognitiveservices.speech.*
 import com.microsoft.cognitiveservices.speech.util.EventHandler
 
 import android.media.AudioManager
+import android.media.AudioAttributes
+import android.media.AudioFocusRequest
+import android.os.Handler
+import android.os.Looper
 import com.microsoft.cognitiveservices.speech.audio.PullAudioInputStreamCallback
 import com.microsoft.cognitiveservices.speech.audio.AudioStreamFormat
 import java.util.concurrent.BlockingQueue
@@ -764,31 +768,23 @@ class AzureAsrHelper(private val context: Context) {
 
         private fun runMicrophoneCapture() {
             try {
+                // 首先设置通话音频模式
+                setupCommunicationAudioMode()
+                
                 val supportedSampleRates = intArrayOf(16000, 8000, 11025, 22050, 44100)
-                // 查找设备支持的最佳采样率
                 val sampleRate = supportedSampleRates.firstOrNull { rate ->
-                    val bufferSize = AudioRecord.getMinBufferSize(
-                        rate,
-                        channelConfig,
-                        audioFormat
-                    )
-                    bufferSize > 0 // 返回正值表示支持
-                } ?: 16000 // 默认回退值
+                    val bufferSize = AudioRecord.getMinBufferSize(rate, channelConfig, audioFormat)
+                    bufferSize > 0
+                } ?: 16000
 
+                val minBufferSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat)
 
-                // 计算最小缓冲区大小（避免出现音频欠载）
-                val minBufferSize = AudioRecord.getMinBufferSize(
-                    sampleRate,
-                    channelConfig,
-                    audioFormat
-                )
-// 创建录音对象
+                // 使用VOICE_COMMUNICATION音频源（专为VoIP优化）
                 if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
-                    Log.d("AzureASR", "android.os.Build.VERSION.SDK_INT")
                     val format = AudioFormat.Builder()
                         .setSampleRate(sampleRate)
                         .setEncoding(audioFormat)
-                        .setChannelMask(channelConfig)
+                        .setChannelMask(AudioFormat.CHANNEL_IN_MONO)
                         .build()
 
                     audioRecord = AudioRecord.Builder()
@@ -797,29 +793,27 @@ class AzureAsrHelper(private val context: Context) {
                         .setBufferSizeInBytes(minBufferSize * 2)
                         .build()
                 } else {
-                    // 创建 AudioRecord 对象
                     audioRecord = AudioRecord(
-                        MediaRecorder.AudioSource.VOICE_RECOGNITION,  // 语音识别专用音源（自带降噪/回声消除）
+                        MediaRecorder.AudioSource.VOICE_COMMUNICATION,
                         sampleRate,
                         channelConfig,
                         audioFormat,
-                        minBufferSize * 2  // 使用两倍缓冲区防止溢出
+                        minBufferSize * 2
                     )
-
                 }
-                // 检查初始化状态
+
                 if (audioRecord?.state != AudioRecord.STATE_INITIALIZED) {
                     throw IllegalStateException("AudioRecord初始化失败")
                 }
 
-
-                // 4. 开始录音
                 audioRecord?.startRecording()
-                Log.d("TAG", "录音开始，采样率: $sampleRate Hz")
-
+                
+                Log.d("TAG", "通话模式录音开始，采样率: $sampleRate Hz")
 
             } catch (e: Exception) {
                 Log.e("TAG", "音频捕获异常: ${e.message}")
+                // 出错时恢复音频模式
+                restoreCommunicationAudioMode()
             }
         }
 
@@ -981,5 +975,55 @@ class AzureAsrHelper(private val context: Context) {
         fun onError(error: String)
     }
 
+   /**
+     * 配置通话音频模式以优化回声消除
+     */
+    private fun setupCommunicationAudioMode() {
+        try {
+            audioManager = context.getSystemService(Context.AUDIO_SERVICE) as AudioManager
+            
+            // 保存原始音频模式
+            originalAudioMode = audioManager?.mode ?: AudioManager.MODE_NORMAL
+            
+            // 设置通话模式 - 这是关键！
+            audioManager?.mode = AudioManager.MODE_IN_COMMUNICATION
+            
+            // 启用扬声器（如果需要外放）
+            audioManager?.isSpeakerphoneOn = true
+            
+            // 请求音频焦点
+            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
+                val focusRequest = AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_EXCLUSIVE)
+                    .setAudioAttributes(
+                        AudioAttributes.Builder()
+                            .setUsage(AudioAttributes.USAGE_VOICE_COMMUNICATION)
+                            .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH)
+                            .build()
+                    )
+                    .build()
+                    
+                audioManager?.requestAudioFocus(focusRequest)
+            }
+            
+            Log.d("AudioMode", "通话音频模式已设置: MODE_IN_COMMUNICATION")
+            
+        } catch (e: Exception) {
+            Log.e("AudioMode", "设置通话音频模式失败: ${e.message}")
+        }
+    }
 
-}
+    /**
+     * 恢复原始音频模式
+     */
+    private fun restoreCommunicationAudioMode() {
+        try {
+            audioManager?.mode = originalAudioMode
+            audioManager?.isSpeakerphoneOn = false
+            // 释放音频焦点
+            Log.d("AudioMode", "音频模式已恢复")
+        } catch (e: Exception) {
+            Log.e("AudioMode", "恢复音频模式失败: ${e.message}")
+        }
+    }
+}
+