path: root/dom/media/platforms/wmf/WMFUtils.cpp

/* -*- 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 "WMFUtils.h"

#include <mfidl.h>
#include <shlobj.h>
#include <shlwapi.h>
#include <initguid.h>
#include <stdint.h>

#ifdef MOZ_AV1
#  include "AOMDecoder.h"
#endif
#include "MP4Decoder.h"
#include "OpusDecoder.h"
#include "VideoUtils.h"
#include "VorbisDecoder.h"
#include "VPXDecoder.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/CheckedInt.h"
#include "mozilla/Logging.h"
#include "mozilla/RefPtr.h"
#include "nsTArray.h"
#include "nsThreadUtils.h"
#include "nsWindowsHelpers.h"
#include "prenv.h"
#include "mozilla/mscom/EnsureMTA.h"
#include "mozilla/WindowsVersion.h"

#ifndef WAVE_FORMAT_OPUS
#  define WAVE_FORMAT_OPUS 0x704F
#endif
DEFINE_GUID(MEDIASUBTYPE_OPUS, WAVE_FORMAT_OPUS, 0x000, 0x0010, 0x80, 0x00,
            0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71);

namespace mozilla {

using media::TimeUnit;

bool StreamTypeIsVideo(const WMFStreamType& aType) {
  switch (aType) {
    case WMFStreamType::H264:
    case WMFStreamType::VP8:
    case WMFStreamType::VP9:
    case WMFStreamType::AV1:
      return true;
    default:
      return false;
  }
}

bool StreamTypeIsAudio(const WMFStreamType& aType) {
  switch (aType) {
    case WMFStreamType::MP3:
    case WMFStreamType::AAC:
    case WMFStreamType::OPUS:
    case WMFStreamType::VORBIS:
      return true;
    default:
      return false;
  }
}

// Get a string representation of the stream type. Useful for logging.
const char* StreamTypeToString(WMFStreamType aStreamType) {
  switch (aStreamType) {
    case WMFStreamType::H264:
      return "H264";
    case WMFStreamType::VP8:
      return "VP8";
    case WMFStreamType::VP9:
      return "VP9";
    case WMFStreamType::AV1:
      return "AV1";
    case WMFStreamType::MP3:
      return "MP3";
    case WMFStreamType::AAC:
      return "AAC";
    case WMFStreamType::OPUS:
      return "OPUS";
    case WMFStreamType::VORBIS:
      return "VORBIS";
    default:
      MOZ_ASSERT(aStreamType == WMFStreamType::Unknown);
      return "Unknown";
  }
}

WMFStreamType GetStreamTypeFromMimeType(const nsCString& aMimeType) {
  if (MP4Decoder::IsH264(aMimeType)) {
    return WMFStreamType::H264;
  }
  if (VPXDecoder::IsVP8(aMimeType)) {
    return WMFStreamType::VP8;
  }
  if (VPXDecoder::IsVP9(aMimeType)) {
    return WMFStreamType::VP9;
  }
#ifdef MOZ_AV1
  if (AOMDecoder::IsAV1(aMimeType)) {
    return WMFStreamType::AV1;
  }
#endif
  if (aMimeType.EqualsLiteral("audio/mp4a-latm") ||
      aMimeType.EqualsLiteral("audio/mp4")) {
    return WMFStreamType::AAC;
  }
  if (aMimeType.EqualsLiteral("audio/mpeg")) {
    return WMFStreamType::MP3;
  }
  if (OpusDataDecoder::IsOpus(aMimeType)) {
    return WMFStreamType::OPUS;
  }
  if (VorbisDataDecoder::IsVorbis(aMimeType)) {
    return WMFStreamType::VORBIS;
  }
  return WMFStreamType::Unknown;
}

HRESULT
HNsToFrames(int64_t aHNs, uint32_t aRate, int64_t* aOutFrames) {
  MOZ_ASSERT(aOutFrames);
  const int64_t HNS_PER_S = USECS_PER_S * 10;
  CheckedInt<int64_t> i = aHNs;
  i *= aRate;
  i /= HNS_PER_S;
  NS_ENSURE_TRUE(i.isValid(), E_FAIL);
  *aOutFrames = i.value();
  return S_OK;
}

HRESULT
GetDefaultStride(IMFMediaType* aType, uint32_t aWidth, uint32_t* aOutStride) {
  // Try to get the default stride from the media type.
  HRESULT hr = aType->GetUINT32(MF_MT_DEFAULT_STRIDE, aOutStride);
  if (SUCCEEDED(hr)) {
    return S_OK;
  }

  // Stride attribute not set, calculate it.
  GUID subtype = GUID_NULL;

  hr = aType->GetGUID(MF_MT_SUBTYPE, &subtype);
  NS_ENSURE_TRUE(SUCCEEDED(hr), hr);

  hr = wmf::MFGetStrideForBitmapInfoHeader(subtype.Data1, aWidth,
                                           (LONG*)(aOutStride));
  NS_ENSURE_TRUE(SUCCEEDED(hr), hr);

  return hr;
}

Maybe<gfx::YUVColorSpace> GetYUVColorSpace(IMFMediaType* aType) {
  UINT32 yuvColorMatrix;
  HRESULT hr = aType->GetUINT32(MF_MT_YUV_MATRIX, &yuvColorMatrix);
  NS_ENSURE_TRUE(SUCCEEDED(hr), {});

  switch (yuvColorMatrix) {
    case MFVideoTransferMatrix_BT2020_10:
    case MFVideoTransferMatrix_BT2020_12:
      return Some(gfx::YUVColorSpace::BT2020);
    case MFVideoTransferMatrix_BT709:
      return Some(gfx::YUVColorSpace::BT709);
    case MFVideoTransferMatrix_BT601:
      return Some(gfx::YUVColorSpace::BT601);
    default:
      MOZ_ASSERT_UNREACHABLE("Unhandled MFVideoTransferMatrix_?");
      return {};
  }
}

int32_t MFOffsetToInt32(const MFOffset& aOffset) {
  return int32_t(aOffset.value + (aOffset.fract / 65536.0f));
}

TimeUnit GetSampleDuration(IMFSample* aSample) {
  NS_ENSURE_TRUE(aSample, TimeUnit::Invalid());
  int64_t duration = 0;
  HRESULT hr = aSample->GetSampleDuration(&duration);
  NS_ENSURE_TRUE(SUCCEEDED(hr), TimeUnit::Invalid());
  return TimeUnit::FromMicroseconds(HNsToUsecs(duration));
}

TimeUnit GetSampleTime(IMFSample* aSample) {
  NS_ENSURE_TRUE(aSample, TimeUnit::Invalid());
  LONGLONG timestampHns = 0;
  HRESULT hr = aSample->GetSampleTime(&timestampHns);
  NS_ENSURE_TRUE(SUCCEEDED(hr), TimeUnit::Invalid());
  return TimeUnit::FromMicroseconds(HNsToUsecs(timestampHns));
}

// Gets the sub-region of the video frame that should be displayed.
// See:
// http://msdn.microsoft.com/en-us/library/windows/desktop/bb530115(v=vs.85).aspx
HRESULT
GetPictureRegion(IMFMediaType* aMediaType, gfx::IntRect& aOutPictureRegion) {
  // Determine if "pan and scan" is enabled for this media. If it is, we
  // only display a region of the video frame, not the entire frame.
  BOOL panScan =
      MFGetAttributeUINT32(aMediaType, MF_MT_PAN_SCAN_ENABLED, FALSE);

  // If pan and scan mode is enabled. Try to get the display region.
  HRESULT hr = E_FAIL;
  MFVideoArea videoArea;
  memset(&videoArea, 0, sizeof(MFVideoArea));
  if (panScan) {
    hr = aMediaType->GetBlob(MF_MT_PAN_SCAN_APERTURE, (UINT8*)&videoArea,
                             sizeof(MFVideoArea), nullptr);
  }

  // If we're not in pan-and-scan mode, or the pan-and-scan region is not set,
  // check for a minimimum display aperture.
  if (!panScan || hr == MF_E_ATTRIBUTENOTFOUND) {
    hr = aMediaType->GetBlob(MF_MT_MINIMUM_DISPLAY_APERTURE, (UINT8*)&videoArea,
                             sizeof(MFVideoArea), nullptr);
  }

  if (hr == MF_E_ATTRIBUTENOTFOUND) {
    // Minimum display aperture is not set, for "backward compatibility with
    // some components", check for a geometric aperture.
    hr = aMediaType->GetBlob(MF_MT_GEOMETRIC_APERTURE, (UINT8*)&videoArea,
                             sizeof(MFVideoArea), nullptr);
  }

  if (SUCCEEDED(hr)) {
    // The media specified a picture region, return it.
    aOutPictureRegion = gfx::IntRect(MFOffsetToInt32(videoArea.OffsetX),
                                     MFOffsetToInt32(videoArea.OffsetY),
                                     videoArea.Area.cx, videoArea.Area.cy);
    return S_OK;
  }

  // No picture region defined, fall back to using the entire video area.
  UINT32 width = 0, height = 0;
  hr = MFGetAttributeSize(aMediaType, MF_MT_FRAME_SIZE, &width, &height);
  NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
  NS_ENSURE_TRUE(width <= MAX_VIDEO_WIDTH, E_FAIL);
  NS_ENSURE_TRUE(height <= MAX_VIDEO_HEIGHT, E_FAIL);

  aOutPictureRegion = gfx::IntRect(0, 0, width, height);
  return S_OK;
}

nsString GetProgramW6432Path() {
  char* programPath = PR_GetEnvSecure("ProgramW6432");
  if (!programPath) {
    programPath = PR_GetEnvSecure("ProgramFiles");
  }

  if (!programPath) {
    return u"C:\\Program Files"_ns;
  }
  return NS_ConvertUTF8toUTF16(programPath);
}

const char* MFTMessageTypeToStr(MFT_MESSAGE_TYPE aMsg) {
  switch (aMsg) {
    case MFT_MESSAGE_COMMAND_FLUSH:
      return "MFT_MESSAGE_COMMAND_FLUSH";
    case MFT_MESSAGE_COMMAND_DRAIN:
      return "MFT_MESSAGE_COMMAND_DRAIN";
    case MFT_MESSAGE_COMMAND_MARKER:
      return "MFT_MESSAGE_COMMAND_MARKER";
    case MFT_MESSAGE_SET_D3D_MANAGER:
      return "MFT_MESSAGE_SET_D3D_MANAGER";
    case MFT_MESSAGE_NOTIFY_BEGIN_STREAMING:
      return "MFT_MESSAGE_NOTIFY_BEGIN_STREAMING";
    case MFT_MESSAGE_NOTIFY_END_STREAMING:
      return "MFT_MESSAGE_NOTIFY_END_STREAMING";
    case MFT_MESSAGE_NOTIFY_END_OF_STREAM:
      return "MFT_MESSAGE_NOTIFY_END_OF_STREAM";
    case MFT_MESSAGE_NOTIFY_START_OF_STREAM:
      return "MFT_MESSAGE_NOTIFY_START_OF_STREAM";
    case MFT_MESSAGE_DROP_SAMPLES:
      return "MFT_MESSAGE_DROP_SAMPLES";
    case MFT_MESSAGE_COMMAND_TICK:
      return "MFT_MESSAGE_COMMAND_TICK";
    case MFT_MESSAGE_NOTIFY_RELEASE_RESOURCES:
      return "MFT_MESSAGE_NOTIFY_RELEASE_RESOURCES";
    case MFT_MESSAGE_NOTIFY_REACQUIRE_RESOURCES:
      return "MFT_MESSAGE_NOTIFY_REACQUIRE_RESOURCES";
    case MFT_MESSAGE_NOTIFY_EVENT:
      return "MFT_MESSAGE_NOTIFY_EVENT";
    case MFT_MESSAGE_COMMAND_SET_OUTPUT_STREAM_STATE:
      return "MFT_MESSAGE_COMMAND_SET_OUTPUT_STREAM_STATE";
    case MFT_MESSAGE_COMMAND_FLUSH_OUTPUT_STREAM:
      return "MFT_MESSAGE_COMMAND_FLUSH_OUTPUT_STREAM";
    default:
      return "Invalid message?";
  }
}

GUID AudioMimeTypeToMediaFoundationSubtype(const nsACString& aMimeType) {
  if (aMimeType.EqualsLiteral("audio/mpeg")) {
    return MFAudioFormat_MP3;
  } else if (MP4Decoder::IsAAC(aMimeType)) {
    return MFAudioFormat_AAC;
  } else if (VorbisDataDecoder::IsVorbis(aMimeType)) {
    return MFAudioFormat_Vorbis;
  } else if (OpusDataDecoder::IsOpus(aMimeType)) {
    return MFAudioFormat_Opus;
  }
  NS_WARNING("Unsupport audio mimetype");
  return GUID_NULL;
}

GUID VideoMimeTypeToMediaFoundationSubtype(const nsACString& aMimeType) {
  if (MP4Decoder::IsH264(aMimeType)) {
    return MFVideoFormat_H264;
  } else if (VPXDecoder::IsVP8(aMimeType)) {
    return MFVideoFormat_VP80;
  } else if (VPXDecoder::IsVP9(aMimeType)) {
    return MFVideoFormat_VP90;
  }
#ifdef MOZ_AV1
  else if (AOMDecoder::IsAV1(aMimeType)) {
    return MFVideoFormat_AV1;
  }
#endif
  NS_WARNING("Unsupport video mimetype");
  return GUID_NULL;
}

void AACAudioSpecificConfigToUserData(uint8_t aAACProfileLevelIndication,
                                      const uint8_t* aAudioSpecConfig,
                                      uint32_t aConfigLength,
                                      nsTArray<BYTE>& aOutUserData) {
  MOZ_ASSERT(aOutUserData.IsEmpty());

  // The MF_MT_USER_DATA for AAC is defined here:
  // http://msdn.microsoft.com/en-us/library/windows/desktop/dd742784%28v=vs.85%29.aspx
  //
  // For MFAudioFormat_AAC, MF_MT_USER_DATA contains the portion of
  // the HEAACWAVEINFO structure that appears after the WAVEFORMATEX
  // structure (that is, after the wfx member). This is followed by
  // the AudioSpecificConfig() data, as defined by ISO/IEC 14496-3.
  // [...]
  // The length of the AudioSpecificConfig() data is 2 bytes for AAC-LC
  // or HE-AAC with implicit signaling of SBR/PS. It is more than 2 bytes
  // for HE-AAC with explicit signaling of SBR/PS.
  //
  // The value of audioObjectType as defined in AudioSpecificConfig()
  // must be 2, indicating AAC-LC. The value of extensionAudioObjectType
  // must be 5 for SBR or 29 for PS.
  //
  // HEAACWAVEINFO structure:
  //    typedef struct heaacwaveinfo_tag {
  //      WAVEFORMATEX wfx;
  //      WORD         wPayloadType;
  //      WORD         wAudioProfileLevelIndication;
  //      WORD         wStructType;
  //      WORD         wReserved1;
  //      DWORD        dwReserved2;
  //    }
  const UINT32 heeInfoLen = 4 * sizeof(WORD) + sizeof(DWORD);

  // The HEAACWAVEINFO must have payload and profile set,
  // the rest can be all 0x00.
  BYTE heeInfo[heeInfoLen] = {0};
  WORD* w = (WORD*)heeInfo;
  w[0] = 0x0;  // Payload type raw AAC packet
  w[1] = aAACProfileLevelIndication;

  aOutUserData.AppendElements(heeInfo, heeInfoLen);

  if (aAACProfileLevelIndication == 2 && aConfigLength > 2) {
    // The AudioSpecificConfig is TTTTTFFF|FCCCCGGG
    // (T=ObjectType, F=Frequency, C=Channel, G=GASpecificConfig)
    // If frequency = 0xf, then the frequency is explicitly defined on 24 bits.
    int8_t frequency =
        (aAudioSpecConfig[0] & 0x7) << 1 | (aAudioSpecConfig[1] & 0x80) >> 7;
    int8_t channels = (aAudioSpecConfig[1] & 0x78) >> 3;
    int8_t gasc = aAudioSpecConfig[1] & 0x7;
    if (frequency != 0xf && channels && !gasc) {
      // We enter this condition if the AudioSpecificConfig should theorically
      // be 2 bytes long but it's not.
      // The WMF AAC decoder will error if unknown extensions are found,
      // so remove them.
      aConfigLength = 2;
    }
  }
  aOutUserData.AppendElements(aAudioSpecConfig, aConfigLength);
}

namespace wmf {

static const wchar_t* sDLLs[] = {
    L"mfplat.dll",
    L"mf.dll",
    L"dxva2.dll",
    L"evr.dll",
};

HRESULT
LoadDLLs() {
  static bool sDLLsLoaded = false;
  static bool sFailedToLoadDlls = false;

  if (sDLLsLoaded) {
    return S_OK;
  }
  if (sFailedToLoadDlls) {
    return E_FAIL;
  }

  // Try to load all the required DLLs. If we fail to load any dll,
  // unload the dlls we succeeded in loading.
  nsTArray<const wchar_t*> loadedDlls;
  for (const wchar_t* dll : sDLLs) {
    if (!LoadLibrarySystem32(dll)) {
      NS_WARNING("Failed to load WMF DLLs");
      for (const wchar_t* loadedDll : loadedDlls) {
        FreeLibrary(GetModuleHandleW(loadedDll));
      }
      sFailedToLoadDlls = true;
      return E_FAIL;
    }
    loadedDlls.AppendElement(dll);
  }
  sDLLsLoaded = true;

  return S_OK;
}

#define ENSURE_FUNCTION_PTR_HELPER(FunctionType, FunctionName, DLL) \
  static FunctionType FunctionName##Ptr = nullptr;                  \
  if (!FunctionName##Ptr) {                                         \
    FunctionName##Ptr = (FunctionType)GetProcAddress(               \
        GetModuleHandleW(L## #DLL), #FunctionName);                 \
    if (!FunctionName##Ptr) {                                       \
      NS_WARNING("Failed to get GetProcAddress of " #FunctionName   \
                 " from " #DLL);                                    \
      return E_FAIL;                                                \
    }                                                               \
  }

#define ENSURE_FUNCTION_PTR(FunctionName, DLL) \
  ENSURE_FUNCTION_PTR_HELPER(decltype(::FunctionName)*, FunctionName, DLL)

#define ENSURE_FUNCTION_PTR_(FunctionName, DLL) \
  ENSURE_FUNCTION_PTR_HELPER(FunctionName##Ptr_t, FunctionName, DLL)

#define DECL_FUNCTION_PTR(FunctionName, ...) \
  typedef HRESULT(STDMETHODCALLTYPE* FunctionName##Ptr_t)(__VA_ARGS__)

HRESULT
MediaFoundationInitializer::MFStartup() {
  if (IsWin7AndPre2000Compatible()) {
    /*
     * Specific exclude the usage of WMF on Win 7 with compatibility mode
     * prior to Win 2000 as we may crash while trying to startup WMF.
     * Using GetVersionEx API which takes compatibility mode into account.
     * See Bug 1279171.
     */
    return E_FAIL;
  }

  HRESULT hr = LoadDLLs();
  if (FAILED(hr)) {
    return hr;
  }

  const int MF_WIN7_VERSION = (0x0002 << 16 | MF_API_VERSION);

  // decltype is unusable for functions having default parameters
  DECL_FUNCTION_PTR(MFStartup, ULONG, DWORD);
  ENSURE_FUNCTION_PTR_(MFStartup, Mfplat.dll)

  hr = E_FAIL;
  mozilla::mscom::EnsureMTA(
      [&]() -> void { hr = MFStartupPtr(MF_WIN7_VERSION, MFSTARTUP_FULL); });
  return hr;
}

HRESULT
MediaFoundationInitializer::MFShutdown() {
  ENSURE_FUNCTION_PTR(MFShutdown, Mfplat.dll)
  HRESULT hr = E_FAIL;
  mozilla::mscom::EnsureMTA([&]() -> void { hr = (MFShutdownPtr)(); });
  return hr;
}

HRESULT
MFCreateMediaType(IMFMediaType** aOutMFType) {
  ENSURE_FUNCTION_PTR(MFCreateMediaType, Mfplat.dll)
  return (MFCreateMediaTypePtr)(aOutMFType);
}

HRESULT
MFGetStrideForBitmapInfoHeader(DWORD aFormat, DWORD aWidth, LONG* aOutStride) {
  ENSURE_FUNCTION_PTR(MFGetStrideForBitmapInfoHeader, evr.dll)
  return (MFGetStrideForBitmapInfoHeaderPtr)(aFormat, aWidth, aOutStride);
}

HRESULT MFGetService(IUnknown* punkObject, REFGUID guidService, REFIID riid,
                     LPVOID* ppvObject) {
  ENSURE_FUNCTION_PTR(MFGetService, mf.dll)
  return (MFGetServicePtr)(punkObject, guidService, riid, ppvObject);
}

HRESULT
DXVA2CreateDirect3DDeviceManager9(UINT* pResetToken,
                                  IDirect3DDeviceManager9** ppDXVAManager) {
  ENSURE_FUNCTION_PTR(DXVA2CreateDirect3DDeviceManager9, dxva2.dll)
  return (DXVA2CreateDirect3DDeviceManager9Ptr)(pResetToken, ppDXVAManager);
}

HRESULT
MFCreateSample(IMFSample** ppIMFSample) {
  ENSURE_FUNCTION_PTR(MFCreateSample, mfplat.dll)
  return (MFCreateSamplePtr)(ppIMFSample);
}

HRESULT
MFCreateAlignedMemoryBuffer(DWORD cbMaxLength, DWORD fAlignmentFlags,
                            IMFMediaBuffer** ppBuffer) {
  ENSURE_FUNCTION_PTR(MFCreateAlignedMemoryBuffer, mfplat.dll)
  return (MFCreateAlignedMemoryBufferPtr)(cbMaxLength, fAlignmentFlags,
                                          ppBuffer);
}

HRESULT
MFCreateDXGIDeviceManager(UINT* pResetToken,
                          IMFDXGIDeviceManager** ppDXVAManager) {
  ENSURE_FUNCTION_PTR(MFCreateDXGIDeviceManager, mfplat.dll)
  return (MFCreateDXGIDeviceManagerPtr)(pResetToken, ppDXVAManager);
}

HRESULT
MFCreateDXGISurfaceBuffer(REFIID riid, IUnknown* punkSurface,
                          UINT uSubresourceIndex, BOOL fButtomUpWhenLinear,
                          IMFMediaBuffer** ppBuffer) {
  ENSURE_FUNCTION_PTR(MFCreateDXGISurfaceBuffer, mfplat.dll)
  return (MFCreateDXGISurfaceBufferPtr)(riid, punkSurface, uSubresourceIndex,
                                        fButtomUpWhenLinear, ppBuffer);
}

HRESULT
MFTEnumEx(GUID guidCategory, UINT32 Flags,
          const MFT_REGISTER_TYPE_INFO* pInputType,
          const MFT_REGISTER_TYPE_INFO* pOutputType,
          IMFActivate*** pppMFTActivate, UINT32* pnumMFTActivate) {
  ENSURE_FUNCTION_PTR(MFTEnumEx, mfplat.dll)
  return (MFTEnumExPtr)(guidCategory, Flags, pInputType, pOutputType,
                        pppMFTActivate, pnumMFTActivate);
}

HRESULT MFTGetInfo(CLSID clsidMFT, LPWSTR* pszName,
                   MFT_REGISTER_TYPE_INFO** ppInputTypes, UINT32* pcInputTypes,
                   MFT_REGISTER_TYPE_INFO** ppOutputTypes,
                   UINT32* pcOutputTypes, IMFAttributes** ppAttributes) {
  ENSURE_FUNCTION_PTR(MFTGetInfo, mfplat.dll)
  return (MFTGetInfoPtr)(clsidMFT, pszName, ppInputTypes, pcInputTypes,
                         ppOutputTypes, pcOutputTypes, ppAttributes);
}

HRESULT
MFCreateAttributes(IMFAttributes** ppMFAttributes, UINT32 cInitialSize) {
  ENSURE_FUNCTION_PTR(MFCreateAttributes, mfplat.dll)
  return (MFCreateAttributesPtr)(ppMFAttributes, cInitialSize);
}

HRESULT MFCreateEventQueue(IMFMediaEventQueue** ppMediaEventQueue) {
  ENSURE_FUNCTION_PTR(MFCreateEventQueue, mfplat.dll)
  return (MFCreateEventQueuePtr)(ppMediaEventQueue);
}

HRESULT MFCreateStreamDescriptor(DWORD dwStreamIdentifier, DWORD cMediaTypes,
                                 IMFMediaType** apMediaTypes,
                                 IMFStreamDescriptor** ppDescriptor) {
  ENSURE_FUNCTION_PTR(MFCreateStreamDescriptor, mfplat.dll)
  return (MFCreateStreamDescriptorPtr)(dwStreamIdentifier, cMediaTypes,
                                       apMediaTypes, ppDescriptor);
}

HRESULT MFCreateAsyncResult(IUnknown* punkObject, IMFAsyncCallback* pCallback,
                            IUnknown* punkState,
                            IMFAsyncResult** ppAsyncResult) {
  ENSURE_FUNCTION_PTR(MFCreateAsyncResult, mfplat.dll)
  return (MFCreateAsyncResultPtr)(punkObject, pCallback, punkState,
                                  ppAsyncResult);
}

HRESULT MFCreatePresentationDescriptor(
    DWORD cStreamDescriptors, IMFStreamDescriptor** apStreamDescriptors,
    IMFPresentationDescriptor** ppPresentationDescriptor) {
  ENSURE_FUNCTION_PTR(MFCreatePresentationDescriptor, mfplat.dll)
  return (MFCreatePresentationDescriptorPtr)(cStreamDescriptors,
                                             apStreamDescriptors,
                                             ppPresentationDescriptor);
}

HRESULT MFCreateMemoryBuffer(DWORD cbMaxLength, IMFMediaBuffer** ppBuffer) {
  ENSURE_FUNCTION_PTR(MFCreateMemoryBuffer, mfplat.dll);
  return (MFCreateMemoryBufferPtr)(cbMaxLength, ppBuffer);
}

HRESULT MFLockDXGIDeviceManager(UINT* pResetToken,
                                IMFDXGIDeviceManager** ppManager) {
  ENSURE_FUNCTION_PTR(MFLockDXGIDeviceManager, mfplat.dll);
  return (MFLockDXGIDeviceManagerPtr)(pResetToken, ppManager);
}

HRESULT MFUnlockDXGIDeviceManager() {
  ENSURE_FUNCTION_PTR(MFUnlockDXGIDeviceManager, mfplat.dll);
  return (MFUnlockDXGIDeviceManagerPtr)();
}

HRESULT MFPutWorkItem(DWORD dwQueue, IMFAsyncCallback* pCallback,
                      IUnknown* pState) {
  ENSURE_FUNCTION_PTR(MFPutWorkItem, mfplat.dll);
  return (MFPutWorkItemPtr)(dwQueue, pCallback, pState);
}

HRESULT MFSerializeAttributesToStream(IMFAttributes* pAttr, DWORD dwOptions,
                                      IStream* pStm) {
  ENSURE_FUNCTION_PTR(MFSerializeAttributesToStream, mfplat.dll);
  return (MFSerializeAttributesToStreamPtr)(pAttr, dwOptions, pStm);
}

HRESULT MFWrapMediaType(IMFMediaType* pOrig, REFGUID MajorType, REFGUID SubType,
                        IMFMediaType** ppWrap) {
  ENSURE_FUNCTION_PTR(MFWrapMediaType, mfplat.dll);
  return (MFWrapMediaTypePtr)(pOrig, MajorType, SubType, ppWrap);
}

}  // end namespace wmf
}  // end namespace mozilla