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acmDriverEnumCallback
The acmDriverEnumCallback function specifies a callback function used with the acmDriverEnum function. The acmDriverEnumCallback name is a placeholder for an application-defined function name.
BOOL ACMDRIVERENUMCB acmDriverEnumCallback(
HACMDRIVERID hadid,
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| DWORD dwInstance,
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| DWORD fdwSupport
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| );
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Parameters
hadid
Handle of an ACM driver identifier.
dwInstance
Application-defined value specified in acmDriverEnum.
fdwSupport
Driver-support flags specific to the driver specified by hadid. These flags are identical to the fdwSupport flags of the ACMDRIVERDETAILS structure. This parameter can be a combination of the following values:
ACMDRIVERDETAILS_SUPPORTF_ASYNC
Driver supports asynchronous conversions.
ACMDRIVERDETAILS_SUPPORTF_CODEC
Driver supports conversion between two different format tags. For example, if
a driver supports compression from WAVE_FORMAT_PCM to WAVE_FORMAT_ADPCM, this
flag is set.
ACMDRIVERDETAILS_SUPPORTF_CONVERTER
Driver supports conversion between two different formats of the same format
tag. For example, if a driver supports resampling of WAVE_FORMAT_PCM, this flag
is set.
ACMDRIVERDETAILS_SUPPORTF_DISABLED
Driver has been disabled. An application must specify the
ACM_DRIVERENUMF_DISABLED flag with acmDriverEnum to include disabled drivers in the enumeration.
ACMDRIVERDETAILS_SUPPORTF_FILTER
Driver supports a filter (modification of the data without changing any of the
format attributes). For example, if a driver supports volume or echo
operations on WAVE_FORMAT_PCM, this flag is set.
Return Values
The callback function must return TRUE to continue enumeration or FALSE to
stop enumeration.
Remarks
The acmDriverEnum function will return MMSYSERR_NOERROR (zero) if no ACM drivers are installed.
Moreover, the callback function will not be called.
The following functions should not be called from within the callback
function: acmDriverAdd, acmDriverRemove, and acmDriverPriority.
See Also
ACMDRIVERDETAILS, acmDriverEnum, acmDriverAdd, acmDriverRemove, and acmDriverPriority
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