|
acmFormatSuggest
The acmFormatSuggest function queries the ACM or a specified ACM driver to suggest a destination
format for the supplied source format. For example, an application can use this
function to determine one or more valid PCM formats to which a compressed
format can be decompressed.
MMRESULT acmFormatSuggest(
HACMDRIVER had,
|
| LPWAVEFORMATEX pwfxSrc,
|
| LPWAVEFORMATEX pwfxDst,
|
| DWORD cbwfxDst,
|
| DWORD fdwSuggest
|
| );
|
|
Parameters
had
Handle of an open instance of a driver to query for a suggested destination
format. If this parameter is NULL, the ACM attempts to find the best driver to
suggest a destination format.
pwfxSrc
Address of a WAVEFORMATEX structure that identifies the source format for which a destination format
will be suggested by the ACM or specified driver.
pwfxDst
Address of a WAVEFORMATEX structure that will receive the suggested destination format for the pwfxSrc format. Depending on the fdwSuggest parameter, some members of the structure pointed to by pwfxDst may require initialization.
cbwfxDst
Size, in bytes, available for the destination format. The acmMetrics and acmFormatTagDetails functions can be used to determine the maximum size required for any format
available for the specified driver (or for all installed ACM drivers).
fdwSuggest
Flags for matching the desired destination format. The following values are
defined:
ACM_FORMATSUGGESTF_NCHANNELS
The nChannels member of the structure pointed to by pwfxDst is valid. The ACM will query acceptable installed drivers that can suggest a
destination format matching nChannels or fail.
ACM_FORMATSUGGESTF_NSAMPLESPERSEC
The nSamplesPerSec member of the structure pointed to by pwfxDst is valid. The ACM will query acceptable installed drivers that can suggest a
destination format matching nSamplesPerSec or fail.
ACM_FORMATSUGGESTF_WBITSPERSAMPLE
The wBitsPerSample member of the structure pointed to by pwfxDst is valid. The ACM will query acceptable installed drivers that can suggest a
destination format matching wBitsPerSample or fail.
ACM_FORMATSUGGESTF_WFORMATTAG
The wFormatTag member of the structure pointed to by pwfxDst is valid. The ACM will query acceptable installed drivers that can suggest a
destination format matching wFormatTag or fail.
Return Values
Returns zero if successful or an error otherwise. Possible error values
include the following:
MMSYSERR_INVALFLAG
| At least one flag is invalid.
| MMSYSERR_INVALHANDLE
| The specified handle is invalid.
| MMSYSERR_INVALPARAM
| At least one parameter is invalid.
|
See Also
WAVEFORMATEX, acmMetrics, acmFormatTagDetails
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