--- a/dom/media/platforms/wmf/WMFAudioMFTManager.cpp
+++ b/dom/media/platforms/wmf/WMFAudioMFTManager.cpp
@@ -190,16 +190,21 @@ WMFAudioMFTManager::UpdateOutputType()
   NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
 
   hr = type->GetUINT32(MF_MT_AUDIO_SAMPLES_PER_SECOND, &mAudioRate);
   NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
 
   hr = type->GetUINT32(MF_MT_AUDIO_NUM_CHANNELS, &mAudioChannels);
   NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
 
+  AudioConfig::ChannelLayout layout(mAudioChannels);
+  if (!layout.IsValid()) {
+    return E_FAIL;
+  }
+
   return S_OK;
 }
 
 HRESULT
 WMFAudioMFTManager::Output(int64_t aStreamOffset,
                            RefPtr<MediaData>& aOutData)
 {
   aOutData = nullptr;