ACMDRVFORMATSUGGEST (Compact 2013)
3/26/2014
This structure contains client-specified input arguments to the AcmFormatSuggest function. The ACM fills in this structure with the client's input arguments and passes it to an ACM driver with an ACMDM_FORMAT_SUGGEST message.
Syntax
typedef struct {
DWORD cbStruct;
DWORD fdwSuggest;
LPWAVEFORMATEX pwfxSrc;
DWORD cbwfxSrc;
LPWAVEFORMATEX pwfxDst;
DWORD cbwfxDst;
} ACMDRVFORMATSUGGEST;
Members
- cbStruct
Value that specifies the size, in bytes, of the ACMDRVFORMATSUGGEST structure.
fdwSuggest
Value that contains restriction flags that limit the possible destination formats. Any combination of the values listed below can be used. The following table shows the possible values for fdwSuggest.Value
Description
ACM_FORMATSUGGESTF_WFORMATTAG
The wFormatTag member of the WAVEFORMATEX structure pointed to by pwfxDst contains a format tag. The driver can only suggest a destination format associated with the specified format tag; it cannot enforce the suggested format.
ACM_FORMATSUGGESTF_NCHANNELS
The nChannels member of the WAVEFORMATEX structure pointed to by pwfxDst contains a channel value. The driver can only suggest a destination format whose channel value matches the specified value; it cannot enforce the suggested format.
ACM_FORMATSUGGESTF_NSAMPLESPERSEC
The nSamplesPerSec member of the WAVEFORMATEX structure pointed to by pwfxDst contains a sample rate. The driver can only suggest a destination format whose sample rate matches the specified rate; it cannot enforce the suggested format.
ACM_FORMATSUGGESTF_WBITSPERSAMPLE
The nBitsPerSample member of the WAVEFORMATEX structure pointed to by pwfxDst contains a sample size. The driver can only suggest a destination format whose sample size matches the specified size; it cannot enforce the suggested format.
- pwfxSrc
Pointer to a WAVEFORMATEX structure describing the source format.
- cbwfxSrc
Value that specifies the size, in bytes, of the WAVEFORMATEX structure pointed to by pwfxSrc.
- pwfxDst
Pointer to a WAVEFORMATEX structure to receive the suggested destination format description. If flags in the fdwSuggest member are set, corresponding members of this structure contain client-specified values. The driver should fill all empty structure members.
- cbwfxDst
Value that specifies the size, in bytes, of the WAVEFORMATEX structure pointed to by pwfxDst. The driver cannot return an extended WAVEFORMATEX structure that is larger than this size.
Remarks
The WAVEFORMATEX structures specified for source or destination formats may be extended structures defined for particular formats. For example, see IMAADPCMWAVEFORMAT in the Mmreg.h header file. Check the structure's wFormatTag member to determine the format type and, therefore, the specific structure being passed.
Requirements
Header |
msacmdrv.h |