WM_CAP_GET_AUDIOFORMAT

The WM_CAP_GET_AUDIOFORMAT message obtains the audio format or the size of the audio format. You can send this message explicitly or by using the capGetAudioFormat and capGetAudioFormatSize macros.

WM_CAP_GET_AUDIOFORMAT 
wParam = (WPARAM) (wSize); 
lParam = (LPARAM) (LPVOID) (LPWAVEFORMATEX) (psAudioFormat); 
 

Parameters

wSize

Size, in bytes, of the structure referenced by s.

psAudioFormat

Address of a WAVEFORMATEX structure, or NULL. If the value is NULL, the size, in bytes, required to hold the WAVEFORMATEX structure is returned.

Return Values

Returns the size, in bytes, of the audio format.

Remarks

Because compressed audio formats vary in size requirements applications must first retrieve the size, then allocate memory, and finally request the audio format data.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in vfw.h.

See Also

Video Capture Overview, Video Capture Messages, capGetAudioFormat, capGetAudioFormatSize, WAVEFORMATEX