Browser and WebAssembly¶

The live browser viewer opens an .mf4 file, lists channels, and plots selected signals. Parsing and plotting happen in your browser through WebAssembly; the measurement file is not uploaded to a server.

The WebAssembly package exposes WasmMf4File to JavaScript. Its API includes metadata, channel lists, typed arrays, windowed signals, CSV, statistics, and file structure.

import init, { WasmMf4File } from "./pkg/falcon_mdf_wasm.js";

await init();
const bytes = new Uint8Array(await file.arrayBuffer());
const measurement = new WasmMf4File(bytes);
const names = JSON.parse(measurement.channel_names());
const first = measurement.signal_arrays(names[0]);
console.log(first.timestamps, first.values);

Here, file is a browser File selected by the user. signal_arrays avoids serializing sample arrays to JSON. signal_window returns a decimated time window suitable for plotting, and the viewer runs decoding in a Web Worker so the page stays responsive.

See the WASM README for build instructions and the full JavaScript examples.