camera-trng/scripts/obs-noise-camera.mjs

#!/usr/bin/env node
/**
 * OBS Virtual Camera with Noise Source
 * 
 * This script connects to OBS via websocket and:
 * 1. Creates a scene with a noise/random pattern source
 * 2. Starts the virtual camera
 * 
 * Prerequisites:
 * - OBS Studio 28+ (has obs-websocket built-in)
 * - Enable WebSocket Server in OBS: Tools -> WebSocket Server Settings
 * - Set a password or disable authentication for local use
 * 
 * Usage: node obs-noise-camera.mjs [start|stop] [--password=YOUR_PASSWORD]
 */

import OBSWebSocket from 'obs-websocket-js';

const obs = new OBSWebSocket();

const SCENE_NAME = 'NoiseCamera';
const SOURCE_NAME = 'RandomNoise';

async function connect(password) {
    const url = 'ws://127.0.0.1:4455';
    try {
        const config = password ? { rpcVersion: 1, password } : { rpcVersion: 1 };
        await obs.connect(url, password);
        console.log('Connected to OBS WebSocket');
        return true;
    } catch (err) {
        if (err.message?.includes('Authentication')) {
            console.error('Authentication required. Use --password=YOUR_PASSWORD');
            console.error('Or disable authentication in OBS: Tools -> WebSocket Server Settings');
        } else {
            console.error('Failed to connect to OBS:', err.message);
            console.error('Make sure OBS is running and WebSocket Server is enabled');
        }
        return false;
    }
}

async function createNoiseScene() {
    // Check if scene exists
    const { scenes } = await obs.call('GetSceneList');
    const sceneExists = scenes.some(s => s.sceneName === SCENE_NAME);
    
    if (!sceneExists) {
        console.log(`Creating scene: ${SCENE_NAME}`);
        await obs.call('CreateScene', { sceneName: SCENE_NAME });
    }
    
    // Switch to the scene
    await obs.call('SetCurrentProgramScene', { sceneName: SCENE_NAME });
    
    // Check if source exists in scene
    const { sceneItems } = await obs.call('GetSceneItemList', { sceneName: SCENE_NAME });
    const sourceExists = sceneItems.some(item => item.sourceName === SOURCE_NAME);
    
    if (!sourceExists) {
        console.log(`Creating noise source: ${SOURCE_NAME}`);
        
        // Create a color source with shader/noise effect
        // We'll use a color source and apply noise filter, or use browser source with noise
        await obs.call('CreateInput', {
            sceneName: SCENE_NAME,
            inputName: SOURCE_NAME,
            inputKind: 'color_source_v3',
            inputSettings: {
                color: 0xFF808080,  // Gray base
                width: 1920,
                height: 1080
            }
        });
        
        // Add a noise/static filter using the Shader filter if available
        // Or we can use a different approach - let's try adding the "Noise Displacement" filter
        try {
            await obs.call('CreateSourceFilter', {
                sourceName: SOURCE_NAME,
                filterName: 'ShaderNoise',
                filterKind: 'streamfx-filter-shader',
                filterSettings: {
                    'Shader.Type': 0,  // File
                }
            });
        } catch (e) {
            // StreamFX might not be installed, try built-in approach
            console.log('Note: For best results, install StreamFX plugin for shader-based noise');
        }
    }
    
    console.log(`Scene "${SCENE_NAME}" ready`);
}

async function createBrowserNoiseSource() {
    // Alternative: Create a browser source with animated noise
    const { scenes } = await obs.call('GetSceneList');
    const sceneExists = scenes.some(s => s.sceneName === SCENE_NAME);
    
    if (!sceneExists) {
        console.log(`Creating scene: ${SCENE_NAME}`);
        await obs.call('CreateScene', { sceneName: SCENE_NAME });
    }
    
    await obs.call('SetCurrentProgramScene', { sceneName: SCENE_NAME });
    
    const { sceneItems } = await obs.call('GetSceneItemList', { sceneName: SCENE_NAME });
    const sourceExists = sceneItems.some(item => item.sourceName === SOURCE_NAME);
    
    if (!sourceExists) {
        console.log(`Creating browser noise source: ${SOURCE_NAME}`);
        
        // HTML/JS that generates animated noise
        const noiseHtml = `data:text/html,
<!DOCTYPE html>
<html>
<head><style>body{margin:0;overflow:hidden}canvas{display:block}</style></head>
<body>
<canvas id="c"></canvas>
<script>
const c=document.getElementById('c'),x=c.getContext('2d');
c.width=1920;c.height=1080;
function draw(){
  const d=x.createImageData(c.width,c.height);
  for(let i=0;i<d.data.length;i+=4){
    const v=Math.random()*255|0;
    d.data[i]=d.data[i+1]=d.data[i+2]=v;
    d.data[i+3]=255;
  }
  x.putImageData(d,0,0);
  requestAnimationFrame(draw);
}
draw();
</script>
</body>
</html>`;
        
        await obs.call('CreateInput', {
            sceneName: SCENE_NAME,
            inputName: SOURCE_NAME,
            inputKind: 'browser_source',
            inputSettings: {
                url: noiseHtml,
                width: 1920,
                height: 1080,
                fps: 30,
                reroute_audio: false
            }
        });
    }
    
    console.log(`Browser noise source "${SOURCE_NAME}" ready`);
}

async function startVirtualCamera() {
    const { outputActive } = await obs.call('GetVirtualCamStatus');
    if (!outputActive) {
        console.log('Starting virtual camera...');
        await obs.call('StartVirtualCam');
        console.log('Virtual camera started');
    } else {
        console.log('Virtual camera already running');
    }
}

async function stopVirtualCamera() {
    const { outputActive } = await obs.call('GetVirtualCamStatus');
    if (outputActive) {
        console.log('Stopping virtual camera...');
        await obs.call('StopVirtualCam');
        console.log('Virtual camera stopped');
    } else {
        console.log('Virtual camera not running');
    }
}

async function getStatus() {
    const { outputActive } = await obs.call('GetVirtualCamStatus');
    const { currentProgramSceneName } = await obs.call('GetCurrentProgramScene');
    console.log(`Virtual Camera: ${outputActive ? 'RUNNING' : 'STOPPED'}`);
    console.log(`Current Scene: ${currentProgramSceneName}`);
}

async function main() {
    const args = process.argv.slice(2);
    const command = args.find(a => !a.startsWith('--')) || 'start';
    const passwordArg = args.find(a => a.startsWith('--password='));
    const password = passwordArg ? passwordArg.split('=')[1] : undefined;
    
    if (!await connect(password)) {
        process.exit(1);
    }
    
    try {
        switch (command) {
            case 'start':
                await createBrowserNoiseSource();
                await startVirtualCamera();
                await getStatus();
                break;
            case 'stop':
                await stopVirtualCamera();
                break;
            case 'status':
                await getStatus();
                break;
            default:
                console.log('Usage: node obs-noise-camera.mjs [start|stop|status] [--password=PASS]');
        }
    } catch (err) {
        console.error('Error:', err.message);
    } finally {
        obs.disconnect();
    }
}

main();