Bug 1193864 - Fixed dom/media/platforms/wmf/ compilation on mingw. r=cpearce

dom/media/platforms/wmf/MFTDecoder.cpp

@@ -180,10 +180,6 @@ MFTDecoder::CreateOutputSample(RefPtr<IMFSample>* aOutSample)
   hr = wmf::MFCreateAlignedMemoryBuffer(bufferSize, alignment, byRef(buffer));
   NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
 
-  DWORD maxLength = 0;
-  DWORD currentLength = 0;
-  BYTE* dst = nullptr;
-
   hr = sample->AddBuffer(buffer);
   NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
 

dom/media/platforms/wmf/WMFDecoderModule.cpp

@@ -98,11 +98,11 @@ WMFDecoderModule::CreateVideoDecoder(const VideoInfo& aConfig,
                                      FlushableTaskQueue* aVideoTaskQueue,
                                      MediaDataDecoderCallback* aCallback)
 {
-  nsAutoPtr<WMFVideoMFTManager> manager =
+  nsAutoPtr<WMFVideoMFTManager> manager(
     new WMFVideoMFTManager(aConfig,
                            aLayersBackend,
                            aImageContainer,
-                           sDXVAEnabled && ShouldUseDXVA(aConfig));
+                           sDXVAEnabled && ShouldUseDXVA(aConfig)));
 
   nsRefPtr<MFTDecoder> mft = manager->Init();
 
@@ -121,7 +121,7 @@ WMFDecoderModule::CreateAudioDecoder(const AudioInfo& aConfig,
                                      FlushableTaskQueue* aAudioTaskQueue,
                                      MediaDataDecoderCallback* aCallback)
 {
-  nsAutoPtr<WMFAudioMFTManager> manager = new WMFAudioMFTManager(aConfig);
+  nsAutoPtr<WMFAudioMFTManager> manager(new WMFAudioMFTManager(aConfig));
   nsRefPtr<MFTDecoder> mft = manager->Init();
 
   if (!mft) {

dom/media/platforms/wmf/WMFMediaDataDecoder.cpp

@@ -48,7 +48,7 @@ WMFMediaDataDecoder::Init()
 // A single telemetry sample is reported for each MediaDataDecoder object
 // that has detected error or produced output successfully.
 static void
-SendTelemetry(HRESULT hr)
+SendTelemetry(unsigned long hr)
 {
   // Collapse the error codes into a range of 0-0xff that can be viewed in
   // telemetry histograms.  For most MF_E_* errors, unique samples are used,