acmStreamPrepareHeader

	Overview

	Group

	Quick Info

The acmStreamPrepareHeader function prepares an ACMSTREAMHEADER structure for an ACM stream conversion. This function must be called for every stream header before it can be used in a conversion stream. An application needs to prepare a stream header only once for the life of a given stream. The stream header can be reused as long as the sizes of the source and destination buffers do not exceed the sizes used when the stream header was originally prepared.

MMRESULT acmStreamPrepareHeader(

HACMSTREAM has,
LPACMSTREAMHEADER pash,
DWORD fdwPrepare
);

Parameters
has

Handle of the conversion steam.

pash

Address of an ACMSTREAMHEADER structure that identifies the source and destination buffers to be prepared.

fdwPrepare

Reserved; must be zero.

Return Values
Returns zero if successful or an error otherwise. Possible error values include the following:

MMSYSERR_INVALFLAG	At least one flag is invalid.
MMSYSERR_INVALHANDLE	The specified handle is invalid.
MMSYSERR_INVALPARAM	At least one parameter is invalid.
MMSYSERR_NOMEM	The system is unable to allocate resources.

Remarks
Preparing a stream header that has already been prepared has no effect, and the function returns zero. Nevertheless, you should ensure your application does not prepare a stream header multiple times.