// Create callbacks
void QuicktimeLiveImageStream::createSequenceGrabberVideoBottlenecks()
{
OSErr err = noErr;
// set the value of a reference constant that is passed to the callback functions
err = SGSetChannelRefCon(m_gVideoChannel, (long)this);
if (err == noErr)
{
VideoBottles vb;
// get the current bottlenecks
vb.procCount = 9;
err = SGGetVideoBottlenecks(m_gVideoChannel, &vb);
if (err == noErr)
{
// add our GrabFrameComplete function
vb.grabCompleteProc = NewSGGrabCompleteBottleUPP(GrabFrameCompleteProc);
err = SGSetVideoBottlenecks(m_gVideoChannel, &vb);
}
}
}
//--------------------------------------------------------------------
bool ofQuickTimeGrabber::initGrabber(int w, int h){
//---------------------------------
#ifdef OF_VIDEO_CAPTURE_QUICKTIME
//---------------------------------
//---------------------------------- 1 - open the sequence grabber
if( !qtInitSeqGrabber() ){
ofLogError("ofQuickTimeGrabber") << "initGrabber(): unable to initialize the seq grabber";
return false;
}
//---------------------------------- 2 - set the dimensions
//width = w;
//height = h;
MacSetRect(&videoRect, 0, 0, w, h);
//---------------------------------- 3 - buffer allocation
// Create a buffer big enough to hold the video data,
// make sure the pointer is 32-byte aligned.
// also the rgb image that people will grab
offscreenGWorldPixels = (unsigned char*)malloc(4 * w * h + 32);
pixels.allocate(w, h, OF_IMAGE_COLOR);
#if defined(TARGET_OSX) && defined(__BIG_ENDIAN__)
QTNewGWorldFromPtr (&(videogworld), k32ARGBPixelFormat, &(videoRect), NULL, NULL, 0, (offscreenGWorldPixels), 4 * w);
#else
QTNewGWorldFromPtr (&(videogworld), k24RGBPixelFormat, &(videoRect), NULL, NULL, 0, (pixels.getPixels()), 3 * w);
#endif
LockPixels(GetGWorldPixMap(videogworld));
SetGWorld (videogworld, NULL);
SGSetGWorld(gSeqGrabber, videogworld, nil);
//---------------------------------- 4 - device selection
bool didWeChooseADevice = bChooseDevice;
bool deviceIsSelected = false;
//if we have a device selected then try first to setup
//that device
if(didWeChooseADevice){
deviceIsSelected = qtSelectDevice(deviceID, true);
if(!deviceIsSelected && bVerbose)
ofLogError("ofQuickTimeGrabber") << "initGrabber(): unable to open device[" << deviceID << "], will attempt other devices";
}
//if we couldn't select our required device
//or we aren't specifiying a device to setup
//then lets try to setup ANY device!
if(deviceIsSelected == false){
//lets list available devices
listDevices();
setDeviceID(0);
deviceIsSelected = qtSelectDevice(deviceID, false);
}
//if we still haven't been able to setup a device
//we should error and stop!
if( deviceIsSelected == false){
goto bail;
}
//---------------------------------- 5 - final initialization steps
OSStatus err;
err = SGSetChannelUsage(gVideoChannel,seqGrabPreview);
if ( err != noErr ) goto bail;
//----------------- callback method for notifying new frame
err = SGSetChannelRefCon(gVideoChannel, (long)&bHavePixelsChanged );
if(!err) {
VideoBottles vb;
/* get the current bottlenecks */
vb.procCount = 9;
err = SGGetVideoBottlenecks(gVideoChannel, &vb);
if (!err) {
myGrabCompleteProc = NewSGGrabCompleteBottleUPP(frameIsGrabbedProc);
vb.grabCompleteProc = myGrabCompleteProc;
/* add our GrabFrameComplete function */
err = SGSetVideoBottlenecks(gVideoChannel, &vb);
}
}
err = SGSetChannelBounds(gVideoChannel, &videoRect);
if ( err != noErr ) goto bail;
err = SGPrepare(gSeqGrabber, true, false); //theo swapped so preview is true and capture is false
if ( err != noErr ) goto bail;
err = SGStartPreview(gSeqGrabber);
if ( err != noErr ) goto bail;
bGrabberInited = true;
loadSettings();
if( attemptFramerate >= 0 ){
err = SGSetFrameRate(gVideoChannel, IntToFixed(attemptFramerate) );
if ( err != noErr ){
ofLogError("ofQuickTimeGrabber") << "initGrabber: couldn't setting framerate to " << attemptFramerate << ": OSStatus " << err;
}
}
ofLogNotice("ofQuickTimeGrabber") << " inited grabbed ";
ofLogNotice("ofQuickTimeGrabber") << "-------------------------------------";
// we are done
return true;
//--------------------- (bail) something's wrong -----
bail:
ofLogError("ofQuickTimeGrabber") << "***** ofQuickTimeGrabber error *****";
ofLogError("ofQuickTimeGrabber") << "------------------------------------";
//if we don't close this - it messes up the next device!
if(bSgInited) qtCloseSeqGrabber();
bGrabberInited = false;
return false;
//---------------------------------
#else
//---------------------------------
return false;
//---------------------------------
#endif
//---------------------------------
}
