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acmFormatEnumCallback
The acmFormatEnumCallback function specifies a callback function used with the acmFormatEnum function. The acmFormatEnumCallback name is a placeholder for the application-defined function name.
BOOL ACMFORMATENUMCB acmFormatEnumCallback(
HACMDRIVERID hadid,
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| LPACMFORMATDETAILS pafd,
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| DWORD dwInstance,
|
| DWORD fdwSupport
|
| );
|
|
Parameters
hadid
Handle of the ACM driver identifier.
pafd
Address of an ACMFORMATDETAILS structure that contains the enumerated format details for a format tag.
dwInstance
Application-defined value specified in the acmFormatEnum function.
fdwSupport
Driver support flags specific to the driver identified by hadid for the specified format. These flags are identical to the fdwSupport flags of the ACMDRIVERDETAILS structure, but they are specific to the format that is being enumerated. This
parameter can be a combination of the following values and indicates which
operations the driver supports for the format tag:
ACMDRIVERDETAILS_SUPPORTF_ASYNC
Driver supports asynchronous conversions with the specified filter tag.
ACMDRIVERDETAILS_SUPPORTF_CODEC
Driver supports conversion between two different format tags for the specified
format. For example, if a driver supports compression from WAVE_FORMAT_PCM to
WAVE_FORMAT_ADPCM with the specified format, this flag is set.
ACMDRIVERDETAILS_SUPPORTF_CONVERTER
Driver supports conversion between two different formats of the same format
tag while using the specified format. For example, if a driver supports
resampling of WAVE_FORMAT_PCM to the specified format, this flag is set.
ACMDRIVERDETAILS_SUPPORTF_FILTER
Driver supports a filter (modification of the data without changing any of the
format attributes) with the specified format. 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 of the specified format tags
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 indexes 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 acmFormatEnum function will return MMSYSERR_NOERROR (zero) if no formats 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
acmFormatEnum, ACMFORMATDETAILS, ACMDRIVERDETAILS, acmMetrics, acmDriverAdd, acmDriverRemove, acmDriverPriority
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