Blackmagic capture example

BlackmagicCapture.cpp

#include "BlackmagicCapture.h"

BlackmagicCapture::BlackmagicCapture(int _width, int _height, float _framerate){
    width = _width;
    height = _height;
    framerate = _framerate;
    cam.setup(width, height, framerate);
    colorTexture.allocate(width, height, GL_RGB);
    fbo.allocate(width, height);
    fbo.begin();
    ofClear(255, 255, 255, 0);
    fbo.end();
}

void BlackmagicCapture::exit() {
    cam.close();
}

void BlackmagicCapture::update() {
    if(cam.update()) {
        colorTexture = cam.getColorTexture();
        fbo.begin();
        colorTexture.draw(0, 0, width, height/2);
        fbo.end();
    }
}

void BlackmagicCapture::draw() {
    ofPushMatrix();
    ofScale(1.0, 2.0);
    fbo.draw(0, 0);
    ofPopMatrix();
}

BlackmagicCapture.h

#pragma once

#include "ofMain.h"
#include "ofxBlackMagic.h"

class BlackmagicCapture {
public:
    BlackmagicCapture(int width, int height, float framerate);
    void update();
    void draw();
    void exit();
    
    int width, height;
    float framerate;
    
    ofxBlackMagic cam;
    ofTexture colorTexture;
    ofFbo fbo;
};

ofApp.cpp

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup(){
    ofBackground(0);
    blackmagic = new BlackmagicCapture(1920, 1080, 60.0);
}

//--------------------------------------------------------------
void ofApp::update(){
    blackmagic->update();
}

//--------------------------------------------------------------
void ofApp::draw(){
    blackmagic->draw();
}

//--------------------------------------------------------------
void ofApp::keyPressed(int key){

}

//--------------------------------------------------------------
void ofApp::keyReleased(int key){

}

//--------------------------------------------------------------
void ofApp::mouseMoved(int x, int y ){

}

//--------------------------------------------------------------
void ofApp::mouseDragged(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mousePressed(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mouseReleased(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::windowResized(int w, int h){

}

//--------------------------------------------------------------
void ofApp::gotMessage(ofMessage msg){

}

//--------------------------------------------------------------
void ofApp::dragEvent(ofDragInfo dragInfo){ 

}

ofApp.h

#pragma once

#include "ofMain.h"
#include "BlackmagicCapture.h"

class ofApp : public ofBaseApp{
    
public:
    void setup();
    void update();
    void draw();
    
    void keyPressed(int key);
    void keyReleased(int key);
    void mouseMoved(int x, int y );
    void mouseDragged(int x, int y, int button);
    void mousePressed(int x, int y, int button);
    void mouseReleased(int x, int y, int button);
    void windowResized(int w, int h);
    void dragEvent(ofDragInfo dragInfo);
    void gotMessage(ofMessage msg);
    
    BlackmagicCapture * blackmagic;
};