MFTRegister inputinfo array & outputinfo array is pointer

[TopPlay]

HRESULT MFTRegister(
  CLSID                  clsidMFT,
  GUID                   guidCategory,
  LPWSTR                 pszName,
  UINT32                 Flags,
  UINT32                 cInputTypes,
  MFT_REGISTER_TYPE_INFO *pInputTypes,
  UINT32                 cOutputTypes,
  MFT_REGISTER_TYPE_INFO *pOutputTypes,
  IMFAttributes          *pAttributes
);

MSDN:
Pointer to an array of MFT_REGISTER_TYPE_INFO structures. Each member of the array specifies an input format that the MFT supports. This parameter can be NULL.

so function much like:

function MFTRegister(const clsidMFT: CLSID; const guidCategory: TGuid; const pszName: LPCWSTR; const Flags: UINT32; const cInputTypes: UINT32; const pInputTypes: PMFT_REGISTER_TYPE_INFO; const cOutputTypes: UINT32;
  const pOutputTypes: PMFT_REGISTER_TYPE_INFO; pAttributes: IMFAttributes): HRESULT; stdcall;

[TopPlay]

function MFTRegister( clsidMFT: CLSID;  guidCategory: TGuid;  pszName: LPCWSTR;  Flags: UINT32;  cInputTypes: UINT32;  pInputTypes: PMFT_REGISTER_TYPE_INFO;  cOutputTypes: UINT32;
   pOutputTypes: PMFT_REGISTER_TYPE_INFO; pAttributes: IMFAttributes): HRESULT; stdcall;

no const flag is right ,otherwise addr access error!

[FactoryX]

What version of MfApi you are using? In the latest version (2.5.0) this function looks like this:

function MFTRegister(clsidMFT: CLSID;
                       guidCategory: TGUID;
                       pszName: LPCWSTR;
                       Flags: UINT32;
                       cInputTypes: UINT32;
                       pInputTypes: MFT_REGISTER_TYPE_INFO;
                       cOutputTypes: UINT32;
                       pOutputTypes: MFT_REGISTER_TYPE_INFO;
                       pAttributes: IMFAttributes): HResult; stdcall;

  // "Flags" is for future expansion - for now must be 0

It seems this bug has been repaired a while ago.
There should be no const declaration at all.

[TopPlay]

Fix MFTRegister:

function MFTRegister(clsidMFT: CLSID; guidCategory: TGuid; pszName: LPCWSTR; Flags: UINT32;const cInputTypes: UINT32; const pInputTypes: PMFT_REGISTER_TYPE_INFO;const cOutputTypes: UINT32;const  pOutputTypes: PMFT_REGISTER_TYPE_INFO;
  pAttributes: IMFAttributes): HRESULT; stdcall;

and uses it:

function DllRegisterServer(): HRESULT; stdcall;
var
  ProcessorInfos: array of MFT_REGISTER_TYPE_INFO;
  PCM_info: MFT_REGISTER_TYPE_INFO;
  I: Integer;
begin
  Result := E_FAIL;
  for I := Low(AvailableMediaType) to High(AvailableMediaType) do
  begin
    PCM_info.guidMajorType := MFMediaType_Audio;
    PCM_info.guidSubtype := AvailableMediaType[I]^;
    Insert([PCM_info], ProcessorInfos, 0);
  end;
  // Register the MFT's CLSID as a COM object.
  if Failed(RegisterObject(g_hModule, CLSID_TopAudioProcessor, g_sFriendlyName, PWideChar('Both'))) then
    Exit;
  Result := MFTRegister(CLSID_TopAudioProcessor, MFT_CATEGORY_AUDIO_EFFECT, g_sFriendlyName, 0, Length(ProcessorInfos), Pointer(ProcessorInfos), Length(ProcessorInfos), Pointer(ProcessorInfos), nil);
end;

[FactoryX]

Thank you, could you translate this to a sample function?

[FactoryX]

By the way; Why not using the the MFTEnumEx function?

[TopPlay]

i need to write a custom Media foudation Transform to Switch audio stream volume;
so uses this method do Registered a com & MFT component.

[FactoryX]

I would use the IMFPresentationDescriptor interface for that purpose.
An example how to determine, get and set an active stream is given in MfPlayer III. It requires a small piece of code and works fine. see:

// Returns the active(current) stream of a media type
function TMfPlayer.GetActiveStreamType(stType: TMediaTypes; out iStreamIndex: DWord): HRESULT;

and

// Select and deselect streams.
function TMfPlayer.SetActiveStreamType(stType: TMediaTypes; iStreamIndex: DWord): HRESULT;

// Set the volumes for the channels (IMFAudioStreamVolume)
procedure TMfPlayer.SetVolume(Value: TFloatArray);