acmStreamConvertCallback callback function

The acmStreamConvertCallback function specifies an application-provided callback function to be used when the acmStreamOpen function specifies the CALLBACK_FUNCTION flag. The acmStreamConvertCallback name is a placeholder for an application-defined function name.

Syntax

void CALLBACK acmStreamConvertCallback(
   HACMSTREAM has,
   UINT       uMsg,
   DWORD      dwInstance,
   LPARAM     lParam1,
   LPARAM     lParam2
);

Parameters

• has
  Handle to the ACM conversion stream associated with the callback function.

• uMsg
  ACM conversion stream message. The following values are defined.

  Value	Meaning
  MM_ACM_CLOSE	ACM has successfully closed the conversion stream identified by has. The handle specified by has is no longer valid after receiving this message.
  MM_ACM_DONE	ACM has successfully converted the buffer identified by lParam1 (which is a pointer to the ACMSTREAMHEADER structure) for the stream handle identified by has.
  MM_ACM_OPEN	ACM has successfully opened the conversion stream identified by has.

   

• dwInstance
  User-instance data given as the dwInstance parameter of the acmStreamOpen function.

• lParam1
  Message parameter.

• lParam2
  Message parameter.

Return value

This function does not return a value.

Remarks

The following functions should not be called from within the callback function: acmDriverAdd, acmDriverRemove, and acmDriverPriority.

Requirements

See also

Audio Compression Manager

Audio Compression Functions