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ACMFORMATTAGDETAILS
The ACMFORMATTAGDETAILS structure details a waveform-audio format tag for an ACM driver.
typedef struct {
DWORD cbStruct;
DWORD dwFormatTagIndex;
DWORD dwFormatTag;
DWORD cbFormatSize;
DWORD fdwSupport;
DWORD cStandardFormats;
char szFormatTag[ACMFORMATTAGDETAILS_FORMATTAG_CHARS];
} ACMFORMATTAGDETAILS;
Members
cbStruct
Size, in bytes, of the ACMFORMATTAGDETAILS structure. This member must be initialized before an application calls the acmFormatTagDetails or acmFormatTagEnum function. The size specified by this member must be large enough to contain
the base ACMFORMATTAGDETAILS structure. When the acmFormatTagDetails function returns, this member contains the actual size of the information
returned. The returned information will never exceed the requested size.
dwFormatTagIndex
Index of the format tag for which details will be retrieved. The index ranges
from zero to one less than the number of format tags supported by an ACM
driver. The number of format tags supported by a driver is contained in the cFormatTags member of the ACMDRIVERDETAILS structure. The dwFormatTagIndex member is used only when querying format tag details on a driver by index;
otherwise, this member should be zero.
dwFormatTag
Waveform-audio format tag that the ACMFORMATTAGDETAILS structure describes. This member is used for input for the
ACM_FORMATTAGDETAILSF_FORMATTAG and ACM_FORMATTAGDETAILSF_LARGESTSIZE query flags. If the acmFormatTagDetails function is successful, this member is always returned. This member should be
set to WAVE_FORMAT_UNKNOWN for all other query flags.
cbFormatSize
Largest total size, in bytes, of a waveform-audio format of the dwFormatTag type. For example, this member will be 16 for WAVE_FORMAT_PCM and 50 for
WAVE_FORMAT_ADPCM.
fdwSupport
Driver-support flags specific to the format tag. These flags are identical to
the fdwSupport flags of the ACMDRIVERDETAILS structure. This member may be some combination of the following values and
refer to what operations the driver supports with the format tag:
ACMDRIVERDETAILS_SUPPORTF_ASYNC
Driver supports asynchronous conversions with the specified format tag.
ACMDRIVERDETAILS_SUPPORTF_CODEC
Driver supports conversion between two different format tags where one of the
tags is the specified format tag. 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 specified
format tag. For example, if a driver supports resampling of WAVE_FORMAT_PCM, 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 the specified format tag, this flag is set.
ACMDRIVERDETAILS_SUPPORTF_HARDWARE
Driver supports hardware input, output, or both of the specified format tag
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.
cStandardFormats
Number of standard formats of the dwFormatTag type; that is, the combination of all sample rates, bits per sample,
channels, and so on. This value can specify all formats supported by the driver, but
not necessarily.
szFormatTag
String that describes the dwFormatTag type. If the acmFormatTagDetails function is successful, this string is always returned.
See Also
ACMDRIVERDETAILS, acmFormatTagDetails, acmFormatTagEnum, acmMetrics
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