The WM_CAP_SET_AUDIOFORMAT message sets the audio format to use when performing streaming or step capture. You can send this message explicitly or by using the capSetAudioFormat macro.
WM_CAP_SET_AUDIOFORMAT
wParam = (WPARAM) (wSize);
lParam = (LPARAM) (LPVOID) (LPWAVEFORMATEX) (psAudioFormat);
Returns TRUE if successful or FALSE otherwise.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in vfw.h.
Video Capture Overview, Video Capture Messages, capSetAudioFormat, PCMWAVEFORMAT, WAVEFORMATEX