C++ ofVideoGrabber类代码示例

void ModeFour::setup( ofVideoGrabber &vidGrabber, vector<MovingBackground> &bkgListFour ) {
    
    width = ofGetWindowWidth();
    height = ofGetWindowHeight();
    
    //setting up lines and control points
    int numLines = ofGetWindowWidth() / 10;
    int numBreaks = ofGetWindowHeight() / 8;
    
    for (int i = -15; i <numLines+15; i++){
        
        ofPolyline line;
        lineList.push_back(line);
        
        for (int j = -15; j < numBreaks+15; j++){
            Curtain c;
            c.setup(ofVec2f (i*10, j*8));
            pList.push_back(c);
            lineList[i+15].addVertex(ofVec2f(c.pos.x,c.pos.y));
        }
    }
    
    background.loadImage("tint.jpg");
    
    //setting up flowsolver
    flowSolver.setup(vidGrabber.getWidth(), vidGrabber.getHeight(), 0.5, 3, 10, 1, 7, 1.5, false, false);
    
    bkgListFour[0].setup("bkg_modeFour_0.png");
    bkgListFour[1].setup("bkg_modeFour_1.png");
    bkgListFour[2].setup("bkg_modeFour_2.png");
    bkgListFour[3].setup("bkg_modeFour_3.png");
    
}

 void update() {
     cam->update();
     if(cam->isFrameNew()) {
         ofPixels& pix = cam->getPixels();
         int skip = 2;
         int range = mouseX / 25;
         for(int y = 0; y < pix.getHeight(); y += skip) {
             for(int x = 0; x < pix.getWidth(); x += skip) {
                 ofColor cur = pix.getColor(x, y);
                 ofColor result(0, 0, 0, 0);
                 if(cur.r < range || cur.r > 255-range) {
                     result.r = 255;
                     result.a = 255;
                 }
                 if(cur.g < range || cur.g > 255-range) {
                     result.g = 255;
                     result.a = 255;
                 }
                 if(cur.b < range || cur.b > 255-range) {
                     result.b = 255;
                     result.a = 255;
                 }
                 clipping.setColor(x, y, result);
             }
         }
         clipping.update();
         
         if(recording) {
             string fn = "images/" + ofToString(frameCount, 6, '0') + ".jpg";
             imageSaver.saveImage(pix, fn);
             frameCount++;
         }
     }
 }

//--------------------------------------------------------------
void ofApp::setup(){
    //we can now get back a list of devices.
    vector<ofVideoDevice> devices = vidGrabber.listDevices();
    
    for(int i = 0; i < devices.size(); i++){
        cout << devices[i].id << ": " << devices[i].deviceName;
        if( devices[i].bAvailable ){
            cout << endl;
        }else{
            cout << " - unavailable " << endl;
        }
    }
    vidGrabber.setDeviceID(1);

    
    
    vidGrabber.setVerbose(true);
    vidGrabber.initGrabber(width, height);
    recorded = (unsigned char*)malloc(3 * height * width * record_size);
    tmp = (unsigned char*)malloc(3 * height * width);
    back = (unsigned char*)malloc(3 * height * width);
    merged = (unsigned char*)malloc(3 * height * width);
    show = vidGrabber.getPixels();
    udpConnection.Create();
    udpConnection.Bind(1511);
    udpConnection.SetNonBlocking(true);
    for (int i = 0; i < trackers_cnt; i++) {
        tracker t = tracker(i);
        trackers.push_back(t);
    }
    outfile.open("/users/yui/desktop/yellow_imgs/teacher/log.txt", std::ios_base::app);
    
}

	FREObject updateCameraFrame(FREContext ctx, void* funcData, uint32_t argc, FREObject argv[])
	{
		gGrabber.update();
		if( !gGrabber.isFrameNew() ) return NULL;

		FREObject as3Bitmap = argv[0];

		FREBitmapData bitmapData;

		FREAcquireBitmapData(as3Bitmap, &bitmapData);
		// do something
		uint32_t r = rand() % 255;
		uint32_t g = rand() % 255;
		uint32_t b = rand() % 255;

		unsigned char *pixel = gGrabber.getPixels();

		uint32_t* ptr = bitmapData.bits32;
		int offset = bitmapData.lineStride32 - bitmapData.width;
		int alpha = 255;
		for( uint32_t j = 0; j < bitmapData.height; j++ ){
			ptr = bitmapData.bits32 + bitmapData.lineStride32*(bitmapData.height-j-1);
			for( uint32_t i = 0; i < bitmapData.width; i++ ){
				r = *pixel++; g = *pixel++; b = *pixel++;
				*ptr++ = (alpha << 24) | (r << 16) | (g << 8) | b;
			}
		}

		FREInvalidateBitmapDataRect(as3Bitmap, 0, 0, bitmapData.width, bitmapData.height);
		FREReleaseBitmapData(as3Bitmap);

		return NULL;
	}

	void update() {
		cam.update();
		if(cam.isFrameNew()) {
			Mat camMat = toCv(cam);
			tracker.update(camMat);
			trackerDataSave.load(tracker);
		}
	}

void update()
{
    // Update our little offset thingy.
    offset += 0.01;

    if (offset > 1) 
    {
        offset = 0;   
    }
    
    // Update our camera.
    grabber.update();
    
    // If the camera has a new frame to offer us ...
    if (grabber.isFrameNew())
    {
        // Make a copy of our grabber pixels in the colorImage.
        colorImage.setFromPixels(grabber.getPixelsRef());

        // When we assign a color image to a grayscale image, it is converted automatically.
        grayscaleImage = colorImage;
		
	    // If we set learnBackground to true using the keyboard, we'll take a snapshot of 
	    // the background and use it to create a clean foreground image.
		if (learnBackground == true)
		{
		    // We assign the grayscaleImage to the grayscaleBackgroundImage.
			grayscaleBackgroundImage = grayscaleImage;	
			
			// Now we set learnBakground so we won't set a background unless
			// explicitly directed to with a keyboard command.
			learnBackground = false;
		}

        // Create a difference image by comparing the background and the current grayscale images.
		grayscaleAbsoluteDifference.absDiff(grayscaleBackgroundImage, grayscaleImage);

        // Assign grayscaleAbsoluteDifference to the grayscaleBinary image.
        grayscaleBinary = grayscaleAbsoluteDifference;
        
        // Then threshold the grayscale image to create a binary image.
        grayscaleBinary.threshold(threshold, invert);

        // Find contours (blobs) that are between the size of 20 pixels and 
        // 1 / 3 * (width * height) of the camera. Also find holes.
		contourFinder.findContours(grayscaleBinary, 100, (width * height) / 3.0, 10, true);

        // Get the biggest blob and use it to draw.
        if (contourFinder.nBlobs > 0)
        {
            holePositions.addVertex(contourFinder.blobs[0].boundingRect.getCenter());
        }
        else 
        {
		   holePositions.clear(); 
        }
    }
}

 void update() {
     
     ofSetWindowTitle(ofToString(ofGetFrameRate()));
     cam.update();
     if(cam.isFrameNew()) {
         if(ofGetKeyPressed()) {
             results = ccv.classifyFace(cam);
         }
     }
 }

	void setup()
	{
		ofSetFrameRate(60);
		ofSetVerticalSync(true);
		ofBackground(0);
		
		video.initGrabber(1280, 720);
		
		isf.setup(1280, 720, GL_RGB32F);
		isf.load("isf-test");
		
		isf.setImage("inputImage", video.getTexture());
	}

 void update() {
     vid.update();
     if(vid.isFrameNew()) {
         unsigned char* pix = vid.getPixels();
         int j = 0;
         for(int i = 0; i < n; i++) {
             unsigned char& r = pix[j++];
             unsigned char& g = pix[j++];
             unsigned char& b = pix[j++];
             mesh.setVertex(i, ofVec3f(r+20, g+20, b+20));
             mesh.setColor(i, ofColor(r+20, g+20, b+20));
         }
     }
 }

	void setup()
	{
		ofSetFrameRate(60);
		ofSetVerticalSync(true);
		ofBackground(0);
		
		video.initGrabber(1280, 720);
		
		chain.setup(1280, 720);
		chain.load("ZoomBlur.fs");
		chain.load("CubicLensDistortion.fs");
		
		chain.setImage(video.getTextureReference());
	}

//--------------------------------------------------------------
void testApp::update(){

    vidGrabber.grabFrame();
    if(vidGrabber.isFrameNew()) {
        colorImg.setFromPixels(vidGrabber.getPixels(), vidGrabber.getWidth(), vidGrabber.getHeight());
        colorImg.mirror(false, true);

        greyImage = colorImg;
        
        greyImageSmall.scaleIntoMe(greyImage);
        
        haarFinder.findHaarObjects(greyImageSmall);
    }
    
}

 void setup() {
     vid.initGrabber(w, h);
     mesh.setMode(OF_PRIMITIVE_POINTS);
     mesh.addVertices(vector<ofVec3f>(n));
     mesh.addColors(vector<ofFloatColor>(n));
     
 }

	FREObject openCamera(FREContext ctx, void* funcData, uint32_t argc, FREObject argv[])
	{
		gGrabber.initGrabber(1280, 720);

		
		return NULL;
	}

	FREObject getCameraFrameSize(FREContext ctx, void* funcData, uint32_t argc, FREObject argv[])
	{
		int w = gGrabber.getWidth();
		int h = gGrabber.getHeight();

		FREObject fX,fY;

		FRENewObjectFromInt32(w,&fX);
		FRENewObjectFromInt32(h,&fY);

		FREObject value = argv[0];

		FRESetObjectProperty(value,(const uint8_t*)"w",fX,NULL);                
		FRESetObjectProperty(value,(const uint8_t*)"h",fY,NULL);
		return NULL;
	}

	void update()
	{
		video.update();
		
		float t = ofGetElapsedTimef() * 2;
		isf.setUniform<float>("blurAmount", ofNoise(1, 0, 0, t) * 1.5);
		isf.update();
	}