#4871 Fix webrtc crash on tuningGetEnergy

Author: akleshchev

indra/newview/llvoicewebrtc.cpp

@@ -396,7 +396,7 @@ void LLWebRTCVoiceClient::updateSettings()
             config.mNoiseSuppressionLevel = noiseSuppressionLevel;
             audioConfigChanged            = true;
         }
-        if (audioConfigChanged)
+        if (audioConfigChanged && mWebRTCDeviceInterface)
         {
             mWebRTCDeviceInterface->setAudioConfig(config);
         }
@@ -797,7 +797,10 @@ void LLWebRTCVoiceClient::tuningStart()
 {
     if (!mIsInTuningMode)
     {
-        mWebRTCDeviceInterface->setTuningMode(true);
+        if (mWebRTCDeviceInterface)
+        {
+            mWebRTCDeviceInterface->setTuningMode(true);
+        }
         mIsInTuningMode = true;
     }
 }
@@ -806,7 +809,10 @@ void LLWebRTCVoiceClient::tuningStop()
 {
     if (mIsInTuningMode)
     {
-        mWebRTCDeviceInterface->setTuningMode(false);
+        if (mWebRTCDeviceInterface)
+        {
+            mWebRTCDeviceInterface->setTuningMode(false);
+        }
         mIsInTuningMode = false;
     }
 }
@@ -839,6 +845,10 @@ void LLWebRTCVoiceClient::tuningSetSpeakerVolume(float volume)
 
 float LLWebRTCVoiceClient::tuningGetEnergy(void)
 {
+    if (!mWebRTCDeviceInterface)
+    {
+        return 0.f;
+    }
     float rms = mWebRTCDeviceInterface->getTuningAudioLevel();
     return TUNING_LEVEL_START_POINT - TUNING_LEVEL_SCALE * rms;
 }
@@ -866,7 +876,10 @@ void LLWebRTCVoiceClient::refreshDeviceLists(bool clearCurrentList)
         clearCaptureDevices();
         clearRenderDevices();
     }
-    mWebRTCDeviceInterface->refreshDevices();
+    if (mWebRTCDeviceInterface)
+    {
+        mWebRTCDeviceInterface->refreshDevices();
+    }
 }
 
 
@@ -1174,7 +1187,7 @@ void LLWebRTCVoiceClient::sendPositionUpdate(bool force)
 void LLWebRTCVoiceClient::updateOwnVolume()
 {
     F32 audio_level = 0.0f;
-    if (!mMuteMic)
+    if (!mMuteMic && mWebRTCDeviceInterface)
     {
         float rms = mWebRTCDeviceInterface->getPeerConnectionAudioLevel();
         audio_level = LEVEL_START_POINT - LEVEL_SCALE * rms;