IAMMultiMediaStream::Initialize method (amstream.h)

Article
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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 Initialize method initializes the multimedia stream object.

Syntax

HRESULT Initialize(
  [in] STREAM_TYPE   StreamType,
  [in] DWORD         dwFlags,
  [in] IGraphBuilder *pFilterGraph
);

Parameters

[in] StreamType

Member of the STREAM_TYPE enumeration, specifying whether the streams are read-only, write-only, or read/write.

[in] dwFlags

Must be one of the following values:

Value	Description
Zero	Create a filter graph that runs on a separate thread.
AMMSF_NOGRAPHTHREAD	Create a filter graph that runs on the calling thread.

[in] pFilterGraph

[optional] Pointer to the IGraphBuilder interface, or NULL. If this parameter is non-NULL, it specifies a filter graph that the multimedia stream object will use. Otherwise, the multimedia stream object creates a new filter graph.

Return value

Returns an HRESULT value. Possible values include the following.

Return code	Description
E_POINTER	NULL pointer argument.
S_OK	Success.

Remarks

If you specify AMMSF_NOGRAPHTHREAD in the dwFlags parameter, the calling thread must process window messages, and it must release all multimedia streaming objects before the thread exits. Otherwise, the application might deadlock.

Requirements

Requirement	Value
Target Platform	Windows
Header	amstream.h

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