122 lines
4.2 KiB
Markdown
122 lines
4.2 KiB
Markdown
# Web-gPhoto2
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A gPhoto2 implementation using WebAssembly to control DSLR cameras from the browser.
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Powered by a [custom fork](https://github.com/RReverser/libgphoto2) of [libgphoto2](https://github.com/gphoto/libgphoto2), the [WebUSB](https://github.com/WICG/webusb) backend of [libusb](https://github.com/libusb/libusb), and WebAssembly via [Emscripten](https://emscripten.org/).
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# NPM
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## Installation
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```bash
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npm install web-gphoto2
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// or
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yarn add web-gphoto2
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```
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## Usage
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A short example on how to use this package:
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```ts
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import Camera from 'web-gphoto2';
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let camera = new Camera();
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async function connectCamera() {
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// @ts-ignore
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await navigator.usb.requestDevice({
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filters: [{ classCode: 6, subclassCode: 1 }]
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});
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await camera.connect();
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}
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async function getSupportedOps() {
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const ops = await camera.getSupportedOps();
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console.log('Supported Ops:', ops);
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}
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async function getCameraConfig() {
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const config = await camera.getConfig();
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console.log('Config:', config);
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}
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async function updateConfig() {
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await camera.setConfigValue('iso', '800');
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}
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async function capturePreviewAsBlob() {
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const blob = await camera.capturePreviewAsBlob();
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console.log('Blob:', blob);
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}
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async function captureImageAsFile() {
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const file = await camera.captureImageAsFile();
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console.log('File:', file);
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}
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```
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## Common Issues
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### SharedArrayBuffer can not be found
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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:
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```
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Cross-Origin-Opener-Policy: same-origin
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Cross-Origin-Embedder-Policy: require-corp
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```
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Information from [Stackoverflow](https://stackoverflow.com/questions/64650119/react-error-sharedarraybuffer-is-not-defined-in-firefox)
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### Error: Not found: /node_modules/.vite/deps/libapi.wasm
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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.
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In vite, both of the above mentioned issues are solved by adding the following to your vite.config.js:
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```ts
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import { sveltekit } from '@sveltejs/kit/vite';
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import { defineConfig } from 'vite';
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/** @type {import('vite').Plugin} */
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const viteServerConfig = {
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name: 'add headers',
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configureServer: (server) => {
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server.middlewares.use((req, res, next) => {
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res.setHeader("Cross-Origin-Opener-Policy", "same-origin");
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res.setHeader("Cross-Origin-Embedder-Policy", "require-corp");
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next();
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});
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}
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};
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export default defineConfig({
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plugins: [sveltekit(), viteServerConfig],
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optimizeDeps: {
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exclude: ['web-gphoto2']
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}
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});
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```
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# Demo
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This repository also contains a [demo app](https://web.dev/porting-libusb-to-webusb/) running gPhoto2 on the Web:
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For the detailed technical write-up, see [the official blog post](https://web.dev/porting-libusb-to-webusb/). To see the demo in action, visit the hosted version [here](https://web-gphoto2.rreverser.com/) (but make sure to read the [cross-platform compatibility notes](https://web.dev/porting-libusb-to-webusb/#important-cross-platform-compatibility-notes) first).
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If you don't have a DSLR, you can check out a recording of the demo below:
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https://user-images.githubusercontent.com/557590/152155035-a1664656-a7d9-411f-8cb3-5f04320f1391.mp4
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## Building
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To build, you'll need Docker. Then:
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```bash
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./build.sh # runs build in Docker
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npx serve ui # starts a local server with COOP/COEP
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```
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Then, navigate to http://localhost:5000/ in Chrome.
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## See also
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[RReverser/eos-remote-web](https://github.com/RReverser/eos-remote-web) - my other project for controlling Canon cameras over Web Bluetooth.
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## License
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Like the dependencies, this demo is licensed under [LGPL v2.1](https://github.com/GoogleChromeLabs/web-gphoto2/blob/main/LICENSE).
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