void VideoGrabber::Init()
{
mGrabNextFrame = FALSE;
mPreviousFrameExists = FALSE;
// Setup capture window and connect webcam driver
camhwnd = capCreateCaptureWindow (_T("Ahtung!"), 0 , 0, 0, FRAME_WIDTH, FRAME_HEIGHT, 0, 0);
SendMessage(camhwnd, WM_CAP_DRIVER_CONNECT, 0, 0);
capSetCallbackOnFrame(camhwnd, FrameCallbackProc);
capSetCallbackOnVideoStream(camhwnd, FrameCallbackProc); // Use same callback function, consider mGrabNextFrame flag!
capSetUserData(camhwnd, this); // Callback functions may use pointer to this VideoGrabber
if (mPreviousFrame != NULL) {
delete[] mPreviousFrame;
mPreviousFrame = NULL;
}
mMotionDetectedDuringLastSecond = FALSE;
// TODO: Use MPEGLAYER3WAVEFORMAT instead this
// Setup audio params
WAVEFORMATEX wfex;
wfex.wFormatTag = WAVE_FORMAT_PCM;
wfex.nChannels = 1; // Use mono
wfex.nSamplesPerSec = 8000;
wfex.nAvgBytesPerSec = 8000;
wfex.nBlockAlign = 1;
wfex.wBitsPerSample = 8;
wfex.cbSize = 0;
capSetAudioFormat(camhwnd, &wfex, sizeof(WAVEFORMATEX));
// Setup video capturing and streaming
CAPTUREPARMS parms;
capCaptureGetSetup(camhwnd, &parms, sizeof(CAPTUREPARMS));
parms.fAbortLeftMouse = FALSE;
parms.wPercentDropForError = 100; // Never abort capturing in case of dropped frames
parms.fAbortRightMouse = FALSE;
//parms.fLimitEnabled = TRUE;
//parms.wTimeLimit = 0; // TODO!
parms.fYield = TRUE; // TODO!
capCaptureSetSetup(camhwnd, &parms, sizeof(parms));
// !!!
capSetCallbackOnError(camhwnd, capErrorCallback);
// Resume thread for motion detection
mListenerHandle = CreateThread(0, 0, ListeningRoutine, this, CREATE_SUSPENDED, &mThreadID);
SetEnabled(TRUE);
ResumeThread(mListenerHandle);
}
void CWinVideoGrabber::setAudioFormat(int p_channels, int p_bits_per_sample, int p_sample_rate)
{
if (!inited)
return;
WAVEFORMATEX t_wave_format;
capGetAudioFormat(videowindow, &t_wave_format, sizeof(WAVEFORMATEX));
t_wave_format . nChannels = p_channels;
t_wave_format . wBitsPerSample = p_bits_per_sample;
t_wave_format . nSamplesPerSec = p_sample_rate;
BOOL t_result;
t_result = capSetAudioFormat(videowindow, &t_wave_format, sizeof(t_wave_format));
}
