MFTEncoder.h - mozsearch

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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/. */

#include "EncoderConfig.h"

#if !defined(MFTEncoder_h_)

#  define MFTEncoder_h_

#  include <functional>

#  include <queue>

#  include <deque>

#  include "mozilla/RefPtr.h"

#  include "mozilla/ResultVariant.h"

#  include "nsISupportsImpl.h"

#  include "nsDeque.h"

#  include "nsTArray.h"

#  include "WMF.h"

namespace mozilla {

class MFTEncoder final {

 public:

  struct InputSample {

    RefPtr<IMFSample> mSample{};

    bool mKeyFrameRequested = false;

};

  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MFTEncoder)

  explicit MFTEncoder(const bool aHardwareNotAllowed)

      : mHardwareNotAllowed(aHardwareNotAllowed) {}

  HRESULT Create(const GUID& aSubtype);

  HRESULT Destroy();

  HRESULT SetMediaTypes(IMFMediaType* aInputType, IMFMediaType* aOutputType);

  HRESULT SetModes(const EncoderConfig& aConfig);

  HRESULT SetBitrate(UINT32 aBitsPerSec);

  HRESULT CreateInputSample(RefPtr<IMFSample>* aSample, size_t aSize);

  HRESULT PushInput(const InputSample& aInput);

  HRESULT TakeOutput(nsTArray<RefPtr<IMFSample>>& aOutput);

  HRESULT Drain(nsTArray<RefPtr<IMFSample>>& aOutput);

  HRESULT GetMPEGSequenceHeader(nsTArray<UINT8>& aHeader);

  static nsCString GetFriendlyName(const GUID& aSubtype);

  struct Info final {

    GUID mSubtype;

    nsCString mName;

};

 private:

  // Abstractions to support sync MFTs using the same logic for async MFTs.

  // When the MFT is async and a real event generator is available, simply

  // forward the calls. For sync MFTs, use the synchronous processing model

  // described in

  // https://docs.microsoft.com/en-us/windows/win32/medfound/basic-mft-processing-model#process-data

  // to generate events of the asynchronous processing model.

  using Event = Result<MediaEventType, HRESULT>;

  using EventQueue = std::queue<MediaEventType>;

  class EventSource final {

   public:

    EventSource() : mImpl(Nothing{}) {}

    void SetAsyncEventGenerator(

        already_AddRefed<IMFMediaEventGenerator>&& aAsyncEventGenerator) {

      MOZ_ASSERT(mImpl.is<Nothing>());

      mImpl.emplace<RefPtr<IMFMediaEventGenerator>>(aAsyncEventGenerator);

    void InitSyncMFTEventQueue() {

      MOZ_ASSERT(mImpl.is<Nothing>());

      mImpl.emplace<UniquePtr<EventQueue>>(MakeUnique<EventQueue>());

    bool IsSync() const { return mImpl.is<UniquePtr<EventQueue>>(); }

    Event GetEvent();

    // Push an event when sync MFT is used.

    HRESULT QueueSyncMFTEvent(MediaEventType aEventType);

   private:

    // Pop an event from the queue when sync MFT is used.

    Event GetSyncMFTEvent();

    Variant<

        // Uninitialized.

        Nothing,

        // For async MFT events. See

        // https://docs.microsoft.com/en-us/windows/win32/medfound/asynchronous-mfts#events

        RefPtr<IMFMediaEventGenerator>,

        // Event queue for a sync MFT. Storing EventQueue directly breaks the

        // code so a pointer is introduced.

        UniquePtr<EventQueue>>

        mImpl;

#  ifdef DEBUG

    bool IsOnCurrentThread();

    nsCOMPtr<nsISerialEventTarget> mThread;

#  endif

};

  ~MFTEncoder() { Destroy(); };

  static nsTArray<Info>& Infos();

  static nsTArray<Info> Enumerate();

  static Maybe<Info> GetInfo(const GUID& aSubtype);

  already_AddRefed<IMFActivate> CreateFactory(const GUID& aSubtype);

  // Return true when successfully enabled, false for MFT that doesn't support

  // async processing model, and error otherwise.

  using AsyncMFTResult = Result<bool, HRESULT>;

  AsyncMFTResult AttemptEnableAsync();

  HRESULT GetStreamIDs();

  GUID MatchInputSubtype(IMFMediaType* aInputType);

  HRESULT SendMFTMessage(MFT_MESSAGE_TYPE aMsg, ULONG_PTR aData);

  HRESULT ProcessEvents();

  HRESULT ProcessInput();

  HRESULT ProcessOutput();

  const bool mHardwareNotAllowed;

  RefPtr<IMFTransform> mEncoder;

  // For MFT object creation. See

  // https://docs.microsoft.com/en-us/windows/win32/medfound/activation-objects

  RefPtr<IMFActivate> mFactory;

  // For encoder configuration. See

  // https://docs.microsoft.com/en-us/windows/win32/directshow/encoder-api

  RefPtr<ICodecAPI> mConfig;

  DWORD mInputStreamID;

  DWORD mOutputStreamID;

  MFT_INPUT_STREAM_INFO mInputStreamInfo;

  MFT_OUTPUT_STREAM_INFO mOutputStreamInfo;

  bool mOutputStreamProvidesSample;

  size_t mNumNeedInput;

  enum class DrainState { DRAINED, DRAINABLE, DRAINING };

  DrainState mDrainState = DrainState::DRAINABLE;

  std::deque<InputSample> mPendingInputs;

  nsTArray<RefPtr<IMFSample>> mOutputs;

  EventSource mEventSource;

};

}  // namespace mozilla

#endif