IAMMultiMediaStream::OpenFile method (amstream.h)

Articolo
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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 OpenFile method opens and automatically creates a filter graph for the specified media file. If DirectShow doesn't support the file format, this method does nothing.

Syntax

HRESULT OpenFile(
  [in] LPCWSTR pszFileName,
  [in] DWORD   dwFlags
);

Parameters

[in] pszFileName

Pointer to the name of the file you want to open.

[in] dwFlags

Value that modifies how the filter graph will render the specified file. This value is a combination of one or more of the following flags.

Value	Description
AMMSF_NOCLOCK	Run the stream with no clock.
AMMSF_NORENDER	Open the file, but do not render any streams. This flag should always be accompanied with the AMMSF_RUN flag.
AMMSF_RENDERALLSTREAMS	Render all streams, including those that do not have an existing media stream.
AMMSF_RENDERTOEXISTING	Only render to existing streams.
AMMSF_RUN	Set the stream into the run state.

Return value

Returns one of the following values.

Return code	Description
E_INVALIDARG	The dwFlags parameter is invalid.
E_POINTER	This method tried to access an invalid pointer.
S_OK	Success.

Remarks

The AMMSF_RENDERALLSTREAMS flag will create default rendering filters for video and audio if they do not exist. However, these default filters cannot be accessed by the IStreamSample::GetMediaStream method.

Requirements

Requirement	Value
Target Platform	Windows
Header	amstream.h

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