Porting USB applications to the web – libusb #USB #WebUSB #Chrome @ChromiumDev

The Chromium devs document how apps that communicate with USB devices can be ported to the web by porting libusb—a popular USB library written in C—to WebAssembly (via Emscripten), Asyncify and WebUSB.

On many platforms, Chromium implementation of WebUSB also uses libusb under the hood. So what the port achieves is, in fact, one libusb, compiled to WebAssembly, talking to another libusb, shipped as part of the browser, through an intermediate layer. Isn’t the web fun?

Important cross-platform compatibility notes

Unfortunately, on Windows any “well-known” devices, including DSLR cameras, are assigned a system driver, which is not compatible with WebUSB. If you want to try the demo on Windows, you’ll have to use a tool like Zadig to override the driver for the connected DSLR to either WinUSB or libusb. This approach works fine for me and many other users, but you should use it at your own risk.

On Linux, you will likely need to set custom permissions to allow access to your DSLR via WebUSB, although this depends on your distribution.

On macOS and Android, the demo should work out of the box.

See all the details in the post here.

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