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acmFilterEnumCallback
The acmFilterEnumCallback function specifies a callback function used with the acmFilterEnum function. The acmFilterEnumCallback name is a placeholder for an application-defined function name.
BOOL ACMFILTERENUMCB acmFilterEnumCallback(
HACMDRIVERID hadid,
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| LPACMFILTERDETAILS pafd,
|
| DWORD dwInstance,
|
| DWORD fdwSupport
|
| );
|
|
Parameters
hadid
Handle of the ACM driver identifier.
pafd
Address of an ACMFILTERDETAILS structure that contains the enumerated filter details for a filter tag.
dwInstance
Application-defined value specified in acmFilterEnum.
fdwSupport
Driver-support flags specific to the driver identified by hadid for the specified filter. These flags are identical to the fdwSupport flags of the ACMDRIVERDETAILS structure, but they are specific to the filter that is being enumerated. This
parameter can be a combination of the following values and identifies which
operations the driver supports for the filter tag:
ACMDRIVERDETAILS_SUPPORTF_ASYNC
Driver supports asynchronous conversions with the specified filter tag.
ACMDRIVERDETAILS_SUPPORTF_CODEC
Driver supports conversion between two different format tags while using the
specified filter. For example, if a driver supports compression from
WAVE_FORMAT_PCM to WAVE_FORMAT_ADPCM with the specified filter, this flag is set.
ACMDRIVERDETAILS_SUPPORTF_CONVERTER
Driver supports conversion between two different formats of the same format
tag while using the specified filter. For example, if a driver supports
resampling of WAVE_FORMAT_PCM with the specified filter, this flag is set.
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.
ACMDRIVERDETAILS_SUPPORTF_HARDWARE
Driver supports hardware input, output, or both with the specified filter
through a waveform-audio device. An application should use the acmMetrics function with the ACM_METRIC_HARDWARE_WAVE_INPUT and
ACM_METRIC_HARDWARE_WAVE_OUTPUT metric indices to get the waveform-audio device identifiers associated
with the supporting ACM driver.
Return Values
The callback function must return TRUE to continue enumeration or FALSE to
stop enumeration.
Remarks
The acmFilterEnum function will return MMSYSERR_NOERROR (zero) if no filters are to be
enumerated. 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
acmFilterEnum, ACMFILTERDETAILS, acmMetrics, acmDriverAdd, acmDriverRemove, acmDriverPriority
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