IAVIStream::FindSample method (vfw.h)

Article
02/22/2024

The FindSample method obtains the position in a stream of a key frame or a nonempty frame. Called when an application uses the AVIStreamFindSample function.

Syntax

LONG FindSample(
  LONG lPos,
  LONG lFlags
);

Parameters

lPos

Position of the sample or frame.

lFlags

Applicable flags. The following values are defined.

Value	Description
FIND_ANY	Searches for a nonempty frame.
FIND_FORMAT	Searches for a format change.
FIND_KEY	Searches for a key frame.
FIND_NEXT	Searches forward through a stream, beginning with the current frame.
FIND_PREV	Searches backward through a stream, beginning with the current frame.

The FIND_ANY, FIND_KEY, and FIND_FORMAT flags are mutually exclusive, as are the FIND_NEXT and FIND_PREV flags. You must specify one value from each group.

Return value

Returns the location of the key frame corresponding to the frame specified by the application.

Remarks

If key frames are not significant in your custom format, return the position specified for lPos.

For handlers written in C++, FindSample has the following syntax:


LONG FindSample(LONG lPos, LONG lFlags)

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	vfw.h
Library	Vfw32.lib