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AVIStreamPrevSample
The AVIStreamPrevSample macro locates the nearest nonempty sample that precedes a specified position
in a stream.
AVIStreamPrevSample(
Parameters
pavi
Handle of an open stream.
lPos
Starting position to search in the stream.
Return Values
Returns the sample position if successful or  1 otherwise.
Remarks
The sample position returned does not include the sample specified by lPos.
The AVIStreamPrevSample macro is defined as follows:
#define AVIStreamPrevSample(pavi, lPos) \
AVIStreamFindSample(pavi, lPos - 1, FIND_PREV | FIND_ANY)
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