IStreamSample::GetSampleTimes

  • 项目

This method retrieves the current sample's start and end times. If the sample is updating, this method returns the times after the update completes.

HRESULT GetSampleTimes(
  STREAM_TIME* pStartTime,
  STREAM_TIME* pEndTime,
  STREAM_TIME* pCurrentTime
);

Parameters

  • pStartTime
    [out] Pointer to a STREAM_TIME value that will contain the sample's start time.
  • pEndTime
    [out] Pointer to a STREAM_TIME value that will contain the sample's end time.
  • pCurrentTime
    [out] Pointer to a STREAM_TIME value that will contain the media stream's current media time.

Return Values

Returns S_OK if successful or E_POINTER if one of the parameters is invalid.

Remarks

For streams that have a clock, the start and end times will be relative to the stream's current time. If the stream does not have a clock, the times are media-relative and the current time will be zero.

The pCurrentTime parameter enables you to conveniently track the media stream's current time, so you do not have to call IMultiMediaStream::GetTime. Unlike GetTime, however, this method returns S_OK if the stream does not have a clock; GetTime returns S_FALSE. The value assigned to pCurrentTime is the same as the value produced by the following code fragment.

pSample->GetMediaStream(&pMediaStream);
pMediaStream->GetMultiMediaStream(&pMultiMediaStream);
pMediaStream->Release();
pMultiMediaStream->GetTime(&pCurrentTime);
pMultiMediaStream->Release();

Requirements

DirectShow applications and DirectShow filters have different include file and link library requirements. See Setting Up the Build Environment for more information.

OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.

See Also

IStreamSample Interface

Last updated on Wednesday, April 13, 2005

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