Thread-topic: vdig capture directly: VDGetImageDescription() problem
Try looking at the source code for seeSaw at
http://www.cse.unsw.edu.au/~danielh/seeSaw/
It also uses video digitizer components directly.
> ----------
> From: wsh
> Sent: Monday, September 11, 2006 4:47 AM
>
> Because the letter is limited in size, I didn't list the code
> completely.Before I use imgHandle,I did define it by imgHandle =
> (ImageDescriptionHandle)NewHandle(0) or imgHandle =
> (ImageDescriptionHandle)NewHandleClear(sizeOf(ImageDescription)); The
> problem doesn't lie here.
> Anyway, thank you all the same.
>
>
> > -----Original Message-----
> > From: Joe van Tunen
> > Sent: Saturday, September 09, 2006 1:55 AM
> >
> > You must first create the imgHandle like this:
> >
> > imgHandle = (ImageDescriptionHandle)NewHandle(0);
> >
> > > ----------
> > > From: wshvic
> > > Sent: Thursday, September 7, 2006 11:57 PM
> > >
> > > Hi everyone
> > >
> > > If get vdig from SGGetVideoDigitizerComponent(), I can call
> > VDGetImageDescription() to get image desc correctly.(NOTE: I must call
> > SGPrepare() ,otherWise VDGetImageDescription() function won't work. I
> don't
> > know why, this is QUESTION 1.).
> > > If I open vdig component directly, VDGetImageDescription() function
> won't
> > work. My code is posted below:
> > > 1. open
> > > FindNextComponent(), OpenComponent();
> > > 2. configure vdig
> > > VDSetInput(vdigComponent,3); // selected input index is 3.
> > > VDSetInputStandard(vdigComponent,ntscIn);
> > > VDGetMaxSrcRect(vdigComponent,3,&maxSrcRect);
> > > VDSetDigitizerRect(vdigComponent,&maxSrcRect);
> > > VDSetTimeBase(vdigComponent,NewTimeBase());
> > > VDSetCompressionOnOff(vdigComponent,FALSE);
> > > VDGetImageDescription(vdigComponent,imgHandle); // PROBLEM!!!!
> > > // when the code runs here, it is hung up, GDB Debugger is lauched. It
> appears
> > that VDGetImageDescription() function can not return. MY Question is that
> Is
> > the order that I configure the vdig incorrect or I miss some necessary
> settings.
> > This is QUESTION 2.
> > > BTW: I don't use seqGrab component and its video channel , I want to
> get
> > video device list directly without SGGetChannelDeviceList() , is this
> possible?
> > This is QUESTION3.
> > >
> > >
> > > any help would be appreciated! Thank you very much!
> > > email@hidden
> > >
>
>
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