function cleans up the preparation performed by the acmStreamPrepareHeader
function for an ACM stream. This function must be called after the ACM is
finished with the given buffers. An application must call this function before
freeing the source and destination buffers.
| HACMSTREAM has,
| LPACMSTREAMHEADER pash,
| DWORD fdwUnprepare
Handle of the conversion steam.
Address of an ACMSTREAMHEADER
structure that identifies the source and destination buffers to be unprepared.
Reserved; must be zero.
Returns zero if successful or an error otherwise. Possible error values
include the following:
||The stream header specified in pash is currently in use and cannot be unprepared.
||The stream header specified in pash is currently not prepared by the acmStreamPrepareHeader function.
||At least one flag is invalid.
||The specified handle is invalid.
||At least one parameter is invalid.
Unpreparing a stream header that has already been unprepared is an error. An
application must specify the source and destination buffer lengths (cbSrcLength
, respectively) that were used during a call to the corresponding acmStreamPrepareHeader
. Failing to reset these member values will cause acmStreamUnprepareHeader
to fail with an MMSYSERR_INVALPARAM error.
The ACM can recover from some errors. The ACM will return a nonzero error, yet
the stream header will be properly unprepared. To determine whether the stream
header was actually unprepared, an application can examine the
ACMSTREAMHEADER_STATUSF_PREPARED flag. If acmStreamUnprepareHeader
returns success, the header will always be unprepared.
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