Re: [libdc] Is there any available xcode source on libdc1394?

[Rodolphe P. <pi...@rt...>]

On Tue 11/5/13, at 8:53, June Kang <ang...@gm...> wrote:

> Dear all,
> I’m trying to build ‘simple’ c-based movie clip recording tool for OS X with libdc in xcode.
> However I can’t find any examples or source codes independant from 3rd part wrappers like openFrameworks.
> Is it possible to record movie with simple xcode-based approach (like using qtkit or something.)
> 
> I have to connect the PtGrey camera’s GPIO trigger with other machine, and the movie clip should be taken during trigger on (mode3, maybe),
> and save it as separate small clip.
> 
> Please, If anybody know good starting place or examples, help me.
> 
> Thanks : )
> 
> and bless your day.
> 
> 

I use libdc1394 in Xcode. I took one of the examples and added the function call to my code (I used grab_color_image2.c to start with which compile directly on OS X).
Use the init from grab_color_image2.c to init the camera (with needed tweak to match your camera)

You’ll have to add the libdc1394 as a linked library (or as a static lib as I do in my Xcode project).
For OS X you’ll have to implement a callback that receive the frames :


    // set camera callback ...
    dc1394_capture_set_callback (camera, FrameCallback, (__bridge void *)(self));

Then you need the define the callback like this :

static void FrameCallback (dc1394camera_t *camera, void * data) {
    dc1394video_frame_t *frame;
    dc1394_capture_dequeue (camera, DC1394_CAPTURE_POLICY_POLL, &frame);
    if (frame) {
        /* do something with the data here */
        CamDrawerController	*parentObject = (__bridge CamDrawerController *)data;
        [parentObject updateFrame: frame];
        dc1394_capture_enqueue (camera, frame);
    }
}

So in the function above I call my own function to do something with the Frame (display it, save it as a QT movie, ….).


I hope this help
Regards, Rodolphe


--
|        Rodolphe Pineau    RTI-Zone        |
|         http://www.rti-zone.org/          |
|   Robotics / Unix / Mac OS X / Astronomy  |