private void speakerTestBtn_Click(object sender, EventArgs e)
 {
     if (this.speakerTestBtn.Text.Equals("扬声器测试"))
     {
         // 开始扬声器测试
         this.speakerTestBtn.Text = "停止";
         if (mTRTCCloud != null)
         {
             mDeviceManager.startSpeakerDeviceTest(mTestPath);
         }
     }
     else
     {
         // 停止扬声器测试
         this.speakerTestBtn.Text      = "扬声器测试";
         this.speakerProgressBar.Value = 0;
         if (mTRTCCloud != null)
         {
             mDeviceManager.stopSpeakerDeviceTest();
         }
     }
 }