A gPhoto2 implementation using WebAssembly to control DSLR cameras from the browser.
Powered by a custom fork of libgphoto2, the WebUSB backend of libusb, and WebAssembly via Emscripten.
npm install web-gphoto2
// or
yarn add web-gphoto2A short example on how to use this package:
import Camera from "web-gphoto2";
let camera = new Camera();
async function connectCamera() {
await camera.showCameraPicker();
await camera.connect();
}
async function getSupportedOps() {
const ops = await camera.getSupportedOps();
console.log("Supported Ops:", ops);
}
async function getCameraConfig() {
const config = await camera.getConfig();
console.log("Config:", config);
}
async function updateConfig() {
await camera.setConfigValue("iso", "800");
}
async function capturePreviewAsBlob() {
const blob = await camera.capturePreviewAsBlob();
console.log("Blob:", blob);
}
async function captureImageAsFile() {
const file = await camera.captureImageAsFile();
console.log("File:", file);
}SharedArrayBuffer has been disabled across all browsers due to the Spectre vulnerability. This package uses SharedArrayBuffer to communicate with the WebAssembly module. To work around this issue, you need to set two response headers for your document:
Cross-Origin-Opener-Policy: same-origin
Cross-Origin-Embedder-Policy: require-corp
Information from Stackoverflow
Vite tries to optimize the dependencies by default. This causes the WebAssembly module to be moved to a different location. To prevent this, you need to exclude the web-gphoto2 package from the optimization.
In vite, both of the above mentioned issues are solved by adding the following to your vite.config.js:
import { sveltekit } from "@sveltejs/kit/vite";
import { defineConfig } from "vite";
/** @type {import('vite').Plugin} */
const viteServerConfig = {
name: "add headers",
configureServer: (server) => {
server.middlewares.use((req, res, next) => {
res.setHeader("Cross-Origin-Opener-Policy", "same-origin");
res.setHeader("Cross-Origin-Embedder-Policy", "require-corp");
next();
});
},
};
export default defineConfig({
plugins: [sveltekit(), viteServerConfig],
optimizeDeps: {
exclude: ["web-gphoto2"],
},
});This repository also contains a demo app running gPhoto2 on the Web:
For the detailed technical write-up, see the official blog post. To see the demo in action, visit the hosted version here (but make sure to read the cross-platform compatibility notes first).
If you don't have a DSLR, you can check out a recording of the demo below:
4MUKvJhKOPK2CSTkhnEC.1.mp4
To build, you'll need Docker. Then:
./build.sh # runs build in Docker
npx serve examples/preact # starts a local server with COOP/COEPThen, navigate to http://localhost:3000/ in Chrome.
RReverser/eos-remote-web - my other project for controlling Canon cameras over Web Bluetooth.
Like the dependencies, this demo is licensed under LGPL v2.1.