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diff --git a/dom/media/platforms/wmf/MFTDecoder.h b/dom/media/platforms/wmf/MFTDecoder.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#if !defined(MFTDecoder_h_)
+#define MFTDecoder_h_
+
+#include "WMF.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/ReentrantMonitor.h"
+#include "nsIThread.h"
+
+namespace mozilla {
+
+class MFTDecoder final {
+ ~MFTDecoder();
+
+public:
+ NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MFTDecoder)
+
+ MFTDecoder();
+
+ // Creates the MFT. First thing to do as part of setup.
+ //
+ // Params:
+ // - aMFTClsID the clsid used by CoCreateInstance to instantiate the
+ // decoder MFT.
+ HRESULT Create(const GUID& aMFTClsID);
+
+ // Sets the input and output media types. Call after Init().
+ //
+ // Params:
+ // - aInputType needs at least major and minor types set.
+ // - aOutputType needs at least major and minor types set.
+ // This is used to select the matching output type out
+ // of all the available output types of the MFT.
+ typedef HRESULT (*ConfigureOutputCallback)(IMFMediaType* aOutputType, void* aData);
+ HRESULT SetMediaTypes(IMFMediaType* aInputType,
+ IMFMediaType* aOutputType,
+ ConfigureOutputCallback aCallback = nullptr,
+ void* aData = nullptr);
+
+ // Returns the MFT's IMFAttributes object.
+ already_AddRefed<IMFAttributes> GetAttributes();
+
+ // Retrieves the media type being output. This may not be valid until
+ // the first sample is decoded.
+ HRESULT GetOutputMediaType(RefPtr<IMFMediaType>& aMediaType);
+
+ // Submits data into the MFT for processing.
+ //
+ // Returns:
+ // - MF_E_NOTACCEPTING if the decoder can't accept input. The data
+ // must be resubmitted after Output() stops producing output.
+ HRESULT Input(const uint8_t* aData,
+ uint32_t aDataSize,
+ int64_t aTimestampUsecs);
+ HRESULT Input(IMFSample* aSample);
+
+ HRESULT CreateInputSample(const uint8_t* aData,
+ uint32_t aDataSize,
+ int64_t aTimestampUsecs,
+ RefPtr<IMFSample>* aOutSample);
+
+ // Retrieves output from the MFT. Call this once Input() returns
+ // MF_E_NOTACCEPTING. Some MFTs with hardware acceleration (the H.264
+ // decoder MFT in particular) can't handle it if clients hold onto
+ // references to the output IMFSample, so don't do that.
+ //
+ // Returns:
+ // - MF_E_TRANSFORM_STREAM_CHANGE if the underlying stream output
+ // type changed. Retrieve the output media type and reconfig client,
+ // else you may misinterpret the MFT's output.
+ // - MF_E_TRANSFORM_NEED_MORE_INPUT if no output can be produced
+ // due to lack of input.
+ // - S_OK if an output frame is produced.
+ HRESULT Output(RefPtr<IMFSample>* aOutput);
+
+ // Sends a flush message to the MFT. This causes it to discard all
+ // input data. Use before seeking.
+ HRESULT Flush();
+
+ // Sends a message to the MFT.
+ HRESULT SendMFTMessage(MFT_MESSAGE_TYPE aMsg, ULONG_PTR aData);
+
+
+ HRESULT SetDecoderOutputType(ConfigureOutputCallback aCallback, void* aData);
+private:
+
+
+ HRESULT CreateOutputSample(RefPtr<IMFSample>* aOutSample);
+
+ MFT_INPUT_STREAM_INFO mInputStreamInfo;
+ MFT_OUTPUT_STREAM_INFO mOutputStreamInfo;
+
+ RefPtr<IMFTransform> mDecoder;
+
+ RefPtr<IMFMediaType> mOutputType;
+
+ // True if the IMFTransform allocates the samples that it returns.
+ bool mMFTProvidesOutputSamples;
+
+ // True if we need to mark the next sample as a discontinuity.
+ bool mDiscontinuity;
+};
+
+} // namespace mozilla
+
+#endif