Reminder problem video camera API

I have reviewed most otherwise examples of Sean all camera APIs available publicly.

Some use reminders and events.

I'm interested in video reminder on the camera_start_video() function.

What I want to achieve is

  1. -get each timestamp frame buffer and send it to a list stored in QML. Class doing is subclassing container.
  2. -each image translated and used in ImageView in QML image property.
  3. -If possible, transcode each image and, possibly, the video itself to resolution 480x480px (currently used is the only 720x720px for 1:1 ratio)

Then cherry picked out of the headers and sources:

//header
public:
    static void vfCallbackEntry(camera_handle_t handle, camera_buffer_t* buf, void* arg);
    void vfCallback(camera_buffer_t* buf);

//sources
void VineRecorder::vfCallbackEntry(camera_handle_t handle, camera_buffer_t* buf, void* arg)
{
    (void)handle;
    ((VineRecorder*)arg)->vfCallback(buf);
}

void VineRecorder::vfCallback(camera_buffer_t* buf)
{
    //if (this->capturing()) {
        if (buf->framemetasize == 65536) return;
        if (buf->frametype != CAMERA_FRAMETYPE_NV12) return;

        quint64 currentFrameTimestamp = (quint64)buf->frametimestamp;
        //this->setLastFrameTimestamp(currentFrameTimestamp);
        qDebug() << currentFrameTimestamp;
    //}
}

//line where callback is used
err = camera_start_video(mHandle, filename, vfCallbackEntry, NULL, NULL);

What confuses me, is that vfCallback is not a static member and still it does not recognize "this", or anything else outside its local scope.

Application crashes on each lines commented in vfCallback.

Did get bad "arg" perhaps?

Can someone maybe show an example of a non-static member is used as a reminder? A function pointer?

Thanks for all of your discussions, responses and suggestions. Please help, it's very frustrating.

Nope... I'm a model. I missed this part of your post somehow.

in any case... your mistake is that you spent NOTHING for arg in camera_start_video().  documentation:

@param arg the argument passed to the functions of callback, which is the
* last argument in the callback functions.

(a little difficult to put into words, but everything that you pass as an argument 'arg' of camera_start_video() is the same argument passed to your reminders like "arg")

This is shown in most of the samples.

Tags: BlackBerry Developers

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