IAMMultiMediaStream::AddMediaStream method (amstream.h)

Artikel
4/26/2023

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

Note This interface is deprecated. New applications should not use it.

The AddMediaStream method adds a new media stream to the filter graph.

Syntax

HRESULT AddMediaStream(
  [in]  IUnknown     *pStreamObject,
  [in]  const MSPID  *PurposeId,
  [in]  DWORD        dwFlags,
  [out] IMediaStream **ppNewStream
);

Parameters

[in] pStreamObject

Pointer to the IUnknown interface of an object that is used to create the new media stream. This parameter can be NULL. See Remarks for more information.

[in] PurposeId

Pointer an MSPID the specifies the type of media stream to create. This parameter can be NULL.

[in] dwFlags

Bitwise combination of zero or more of the following flags.

Value	Description
AMMSF_ADDDEFAULTRENDERER	Add a default renderer (audio streams only).
AMMSF_CREATEPEER	Create a new stream based on the object specified in pStreamObject.
AMMSF_NOSTALL	Create a stream that does not block waiting for Update calls.
AMMSF_STOPIFNOSAMPLES	Create a stream that stops if there are not samples.

[out] ppNewStream

Address of a variable that receives an IMediaStream interface pointer.

Return value

Returns an HRESULT value. Possible values include the following.

Return code	Description
E_INVALIDARG	Invalid argument.
E_POINTER	NULL pointer argument.
MS_E_PURPOSEID	Invalid purpose ID.
S_OK	Success.

Remarks

If pPurposeID is NULL, pStreamObject must specify an IMediaStream object. The object's GetInformation method is used to determine the purpose ID, which is then used to create the new media stream.

If the purpose ID is MSPID_PrimaryAudio and dwFlags includes the AMMSF_ADDDEFAULTRENDERER flag, the method adds the DirectSound Renderer to the filter graph.

If dwFlags includes the AMMSF_CREATEPEER flag, the method uses the object specified by pStreamObject to create a new media stream. In that case, pStreamObject can specify any of the following:

An IAMMediaStream pointer.
An IMediaStream pointer.
An IDirectDraw pointer.

If neither flag is set, pStreamObject can be any of the following:

An IAMMediaStream pointer. The object is added to the multimedia stream.
An IDirectDraw pointer. The DirectDraw object is used to create a default video stream.
NULL. A default media stream object is created.

If the method succeeds, the caller must release the returned IMediaStream interface.

Requirements

Requirement	Value
Target Platform	Windows
Header	amstream.h

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