IWMWriterPreprocess::PreprocessSample method (wmsdkidl.h)

Статья
4/26/2023

[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The PreprocessSample method delivers a sample to the writer for preprocessing.

Syntax

HRESULT PreprocessSample(
  [in] DWORD      dwInputNum,
  [in] QWORD      cnsSampleTime,
  [in] DWORD      dwFlags,
  [in] INSSBuffer *pSample
);

Parameters

[in] dwInputNum

DWORD containing the input number of the sample.

[in] cnsSampleTime

Specifies the presentation time of the sample in 100-nanosecond units.

[in] dwFlags

Reserved. Set to zero.

[in] pSample

Pointer to an INSSBuffer interface on an object that contains the sample.

Return value

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return code	Description
S_OK	The method succeeded.
E_INVALIDARG	dwInputNum specifies an invalid input stream. OR pSample is NULL.
NS_E_INVALID_REQUEST	The writer is not running. OR The preprocessor is neither waiting to be run nor stopped in the middle of a pass. OR The preprocessor has already made as many passes as specified by SetNumPreprocessingPasses. OR The input specified is not supported for preprocessing.

Return code

Description

S_OK

The method succeeded.

E_INVALIDARG

dwInputNum specifies an invalid input stream.

pSample is NULL.

NS_E_INVALID_REQUEST

The writer is not running.

The preprocessor is neither waiting to be run nor stopped in the middle of a pass.

The preprocessor has already made as many passes as specified by SetNumPreprocessingPasses.

The input specified is not supported for preprocessing.

Remarks

When performing preprocessing, you should pass the samples for the stream to this method one at a time.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only],Windows Media Format 9 Series SDK, or later versions of the SDK
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	wmsdkidl.h (include Wmsdk.h)
Library	Wmvcore.lib; WMStubDRM.lib (if you use DRM)

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