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acmStreamConvert
The acmStreamConvert function requests the ACM to perform a conversion on the specified conversion
stream. A conversion may be synchronous or asynchronous, depending on how the
stream was opened.
MMRESULT acmStreamConvert(
HACMSTREAM has,
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| LPACMSTREAMHEADER pash,
|
| DWORD fdwConvert
|
| );
|
|
Parameters
has
Handle of the open conversion stream.
pash
Address of a stream header that describes source and destination buffers for a
conversion. This header must have been prepared previously by using the acmStreamPrepareHeader function.
fdwConvert
Flags for doing the conversion. The following values are defined:
ACM_STREAMCONVERTF_BLOCKALIGN
Only integral numbers of blocks will be converted. Converted data will end on
block-aligned boundaries. An application should use this flag for all
conversions on a stream until there is not enough source data to convert to a
block-aligned destination. In this case, the last conversion should be specified without
this flag.
ACM_STREAMCONVERTF_END
ACM conversion stream should begin returning pending instance data. For
example, if a conversion stream holds instance data, such as the end of an echo
filter operation, this flag will cause the stream to start returning this remaining
data with optional source data. This flag can be specified with the
ACM_STREAMCONVERTF_START flag.
ACM_STREAMCONVERTF_START
ACM conversion stream should reinitialize its instance data. For example, if a
conversion stream holds instance data, such as delta or predictor information,
this flag will restore the stream to starting defaults. This flag can be
specified with the ACM_STREAMCONVERTF_END flag.
Return Values
Returns zero if successful or an error otherwise. Possible error values
include the following:
ACMERR_BUSY
| The stream header specified in pash is currently in use and cannot be reused.
| ACMERR_UNPREPARED
| The stream header specified in pash is currently not prepared by the acmStreamPrepareHeader function.
| MMSYSERR_INVALFLAG
| At least one flag is invalid.
| MMSYSERR_INVALHANDLE
| The specified handle is invalid.
| MMSYSERR_INVALPARAM
| At least one parameter is invalid.
|
Remarks
You must use the acmStreamPrepareHeader function to prepare the source and destination buffers before they are passed
to acmStreamConvert.
If an asynchronous conversion request is successfully queued by the ACM or
driver and the conversion is later determined to be impossible, the ACMSTREAMHEADER structure is posted back to the application's callback function with the cbDstLengthUsed member set to zero.
See Also
acmStreamPrepareHeader, ACMSTREAMHEADER
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