examples/example7/CameraThread.cpp

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#include <qmetatype.h>
#include "CameraThread.h"
 
#include <FCam/N900.h>

#include <vector>
#include <iostream>

#include "OverlayWidget.h"

using namespace std;

namespace Plat = FCam::N900;

void CameraThread::run() {

    // Make an asynchronous file writer to save images in the background    
    FCam::AsyncFileWriter writer;   
    Plat::Sensor sensor;
    Plat::Lens lens;
    Plat::Flash flash;
    
    // tell the sensor that the flash and the lens will be tagging
    // frames that come back from it
    sensor.attach(&flash);
    sensor.attach(&lens);
    
    // Make a helper autofocus object
    FCam::AutoFocus autoFocus(&lens);
    
    // The viewfinder shot
    FCam::Shot viewfinder;
    viewfinder.exposure = 40000;
    viewfinder.gain = 1.0f;
    // run at 25 fps
    viewfinder.frameTime = 40000;
    // dump image data directly into the frame buffer
    viewfinder.image = overlay->framebuffer(); 
    // enable histograms and sharpness maps
    viewfinder.histogram.enabled = true;
    viewfinder.histogram.region = FCam::Rect(0, 0, 640, 480);
    viewfinder.sharpness.enabled = true;
    viewfinder.sharpness.size = FCam::Size(16, 12);
    
    // A full 5MP photograph. We'll set the exposure, frameTime, and
    // gain later, after we meter. Default parameters apply (no
    // histograms or sharpness), image memory auto allocated for each
    // new photograph, so that we can have multiple unique photographs
    // saving at once.
    FCam::Shot photo;
    photo.image = FCam::Image(2592, 1968, FCam::RAW, FCam::Image::AutoAllocate);
    
    bool takeSnapshot = false;
    bool halfDepress = false;
    bool fullDepress = false;
    
    // stream the viewfinder
    sensor.stream(viewfinder);
    
    while (keepGoing) {
        // deal with FCam events
        FCam::Event e;
        while (FCam::getNextEvent(&e)) {
            cout << e.description << endl;
            switch(e.type) {
            case FCam::Event::FocusPressed:
                if (autoFocus.idle()) autoFocus.startSweep();       
                halfDepress = true;
                break;
            case FCam::Event::FocusReleased:
                halfDepress = false;
                break;
            case FCam::Event::ShutterPressed:
                takeSnapshot = true;        
                fullDepress = true;
                break;
            case FCam::Event::ShutterReleased:
                fullDepress = false;
            };
        }
    
        // Take a picture once autofocus completes and we have space to store the frame       
        if (takeSnapshot && autoFocus.idle() && writer.savesPending() < 8) {
            // use the metering the viewfinder has been doing
            photo.exposure  = viewfinder.exposure;
            photo.gain      = viewfinder.gain;
            photo.whiteBalance = viewfinder.whiteBalance;
            sensor.capture(photo);
            takeSnapshot = false;
        }
    
        // Drain the queue
        FCam::Frame f;
        do {
            f = sensor.getFrame();
        
            if (f.shot().id == photo.id) {
                // Our photo came back, asynchronously save it to disk
                // with a unique filename. We use the exposure start
                // time for now just so we don't have to keep a
                // globally unique numbering.
                if (!f.image().valid()) {
                    printf("ERROR: Photo dropped!\n");
                    continue;
                } else {
                    printf("Got a 5MP frame\n");
                }

                // Save it as a DNG
                char fname[256];
                snprintf(fname, 255, "/home/user/MyDocs/photo_%s.dng", 
                         f.exposureStartTime().toString().c_str());
                writer.saveDNG(f, fname);

                // Save it as a JPEG too
                snprintf(fname, 255, "/home/user/MyDocs/photo_%s.jpg", 
                         f.exposureStartTime().toString().c_str());
                writer.saveJPEG(f, fname, 90);
            } else {

                // update the autofocus and metering algorithms     
                autoFocus.update(f);
                autoExpose(&viewfinder, f);
                autoWhiteBalance(&viewfinder, f);
                sensor.stream(viewfinder);      
            }
        } while (sensor.framesPending());
    }   
}