MFMediaEngineNotify.h

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/* 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/. */

#ifndef DOM_MEDIA_PLATFORM_WMF_MFMEDIAENGINENOTIFY_H

#define DOM_MEDIA_PLATFORM_WMF_MFMEDIAENGINENOTIFY_H

#include <wrl.h>

#include "MediaEventSource.h"

#include "MFMediaEngineExtra.h"

#include "mozilla/Maybe.h"

namespace mozilla {

const char* MediaEngineEventToStr(MF_MEDIA_ENGINE_EVENT aEvent);

// https://docs.microsoft.com/en-us/windows/win32/api/mfmediaengine/ne-mfmediaengine-mf_media_engine_event

struct MFMediaEngineEventWrapper final {

  explicit MFMediaEngineEventWrapper(MF_MEDIA_ENGINE_EVENT aEvent)

      : mEvent(aEvent) {}

  MF_MEDIA_ENGINE_EVENT mEvent;

  Maybe<DWORD_PTR> mParam1;

  Maybe<DWORD> mParam2;

};

/**

 * MFMediaEngineNotify is used to handle the event sent from the media engine.

 * https://docs.microsoft.com/en-us/windows/win32/api/mfmediaengine/nn-mfmediaengine-imfmediaenginenotify

*/

class MFMediaEngineNotify final

    : public Microsoft::WRL::RuntimeClass<

          Microsoft::WRL::RuntimeClassFlags<

              Microsoft::WRL::RuntimeClassType::ClassicCom>,

          IMFMediaEngineNotify> {

 public:

  MFMediaEngineNotify() = default;

  HRESULT RuntimeClassInitialize() { return S_OK; }

  // Method for IMFMediaEngineNotify

  IFACEMETHODIMP EventNotify(DWORD aEvent, DWORD_PTR aParam1,

                             DWORD aParam2) override;

  MediaEventSource<MFMediaEngineEventWrapper>& MediaEngineEvent() {

    return mEngineEvents;

 private:

  MediaEventProducer<MFMediaEngineEventWrapper> mEngineEvents;

};

}  // namespace mozilla

#endif  // DOM_MEDIA_PLATFORM_WMF_MFMEDIAENGINENOTIFY_H