acmFilterTagDetails

  • Article

The acmFilterTagDetails function queries the ACM for details about a specific waveform-audio filter tag.

MMRESULT acmFilterTagDetails(
  HACMDRIVER            had,       
  LPACMFILTERTAGDETAILS paftd,     
  DWORD_PTR             fdwDetails 
);

Parameters

had

Handle to the ACM driver to query for waveform-audio filter tag details. If this parameter is NULL, the ACM uses the details from the first suitable ACM driver. An application must specify a valid HACMDRIVER or HACMDRIVERID identifier when using the ACM_FILTERTAGDETAILSF_INDEX query type. Driver identifiers for disabled drivers are not allowed.

paftd

Pointer to the ACMFILTERTAGDETAILS structure that is to receive the filter tag details.

fdwDetails

Flags for getting the details. The following values are defined.

Value Meaning
ACM_FILTERTAGDETAILSF_FILTERTAG A filter tag was given in the dwFilterTag member of the ACMFILTERTAGDETAILS structure. The filter tag details will be returned in the structure pointed to by paftd. If an application specifies an ACM driver handle for had, details on the filter tag will be returned for that driver. If an application specifies NULL for had, the ACM finds the first acceptable driver to return the details.
ACM_FILTERTAGDETAILSF_INDEX A filter tag index was given in the dwFilterTagIndex member of the ACMFILTERTAGDETAILS structure. The filter tag and details will be returned in the structure pointed to by paftd. The index ranges from zero to one less than the cFilterTags member returned in the ACMDRIVERDETAILS structure for an ACM driver. An application must specify a driver handle for had when retrieving filter tag details with this flag.
ACM_FILTERTAGDETAILSF_LARGESTSIZE Details on the filter tag with the largest filter size, in bytes, are to be returned. The dwFilterTag member must either be WAVE_FILTER_UNKNOWN or the filter tag to find the largest size for. If an application specifies an ACM driver handle for had, details on the largest filter tag will be returned for that driver. If an application specifies NULL for had, the ACM finds an acceptable driver with the largest filter tag requested to return the details.

Return Values

Returns zero if successful or an error otherwise. Possible error values include the following.

Value Description
ACMERR_NOTPOSSIBLE The details requested are not available.
MMSYSERR_INVALFLAG At least one flag is invalid.
MMSYSERR_INVALHANDLE The specified handle is invalid.
MMSYSERR_INVALPARAM At least one parameter is invalid.

Requirements

**  Windows NT/2000/XP:** Included in Windows NT 3.1 and later.
**  Windows 95/98/Me:** Included in Windows 95 and later.
**  Header:** Declared in Msacm.h.
**  Library:** Use Msacm32.lib.
**  Unicode:** Implemented as Unicode and ANSI versions on Windows NT/2000/XP.

See Also

Audio Compression Manager, Audio Compression Functions, ACMDRIVERDETAILS