CAPWAVECALLBACK callback function (vfw.h)

Article
02/22/2024

The capWaveStreamCallback function is the callback function used with streaming capture to optionally process buffers of audio data. The name capWaveStreamCallback is a placeholder for the application-supplied function name.

To set the callback, send the WM_CAP_SET_CALLBACK_WAVESTREAM message to the capture window or call the capSetCallbackOnWaveStream macro.

Syntax

CAPWAVECALLBACK Capwavecallback;

LRESULT Capwavecallback(
  HWND hWnd,
  LPWAVEHDR lpWHdr
)
{...}

Parameters

hWnd

Handle to the capture window associated with the callback function.

lpWHdr

Pointer to a WAVEHDR structure containing information about the captured audio data.

Return value

None

Remarks

The capture window calls a wave stream callback function when an audio buffer is marked done by the waveform-audio driver. When capturing to disk, this will precede the disk write operation.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	vfw.h