fix: 反复打断任务没有被清除，vad四帧语音识别

main/xiaozhi-server/core/providers/vad/silero.py

@@ -35,6 +35,10 @@ class VADProvider(VADProviderBase):
             pcm_frame = self.decoder.decode(opus_packet, 960)
             conn.client_audio_buffer.extend(pcm_frame)  # 将新数据加入缓冲区
 
+            # 初始化帧计数器
+            if not hasattr(conn, "client_voice_frame_count"):
+                conn.client_voice_frame_count = 0
+
             # 处理缓冲区中的完整帧（每次处理512采样点）
             client_have_voice = False
             while len(conn.client_audio_buffer) >= 512 * 2:
@@ -50,7 +54,15 @@ class VADProvider(VADProviderBase):
                 # 检测语音活动
                 with torch.no_grad():
                     speech_prob = self.model(audio_tensor, 16000).item()
-                client_have_voice = speech_prob >= self.vad_threshold
+                is_voice = speech_prob >= self.vad_threshold
+
+                if is_voice:
+                    conn.client_voice_frame_count += 1
+                else:
+                    conn.client_voice_frame_count = 0
+
+                # 只有连续4帧检测到语音才认为有语音
+                client_have_voice = conn.client_voice_frame_count >= 4
 
                 # 如果之前有声音，但本次没有声音，且与上次有声音的时间差已经超过了静默阈值，则认为已经说完一句话
                 if conn.client_have_voice and not client_have_voice: