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| //load the candle Whisper decoder wasm module | |
| import init, { Decoder } from "./build/m.js"; | |
| async function fetchArrayBuffer(url) { | |
| const cacheName = "whisper-candle-cache"; | |
| const cache = await caches.open(cacheName); | |
| const cachedResponse = await cache.match(url); | |
| if (cachedResponse) { | |
| const data = await cachedResponse.arrayBuffer(); | |
| return new Uint8Array(data); | |
| } | |
| const res = await fetch(url, { cache: "force-cache" }); | |
| cache.put(url, res.clone()); | |
| return new Uint8Array(await res.arrayBuffer()); | |
| } | |
| class Whisper { | |
| static instance = {}; | |
| // Retrieve the Whisper model. When called for the first time, | |
| // this will load the model and save it for future use. | |
| static async getInstance(weightsURL, modelID, tokenizerURL, mel_filtersURL) { | |
| // load individual modelID only once | |
| if (!this.instance[modelID]) { | |
| await init(); | |
| self.postMessage({ status: "loading", message: "Loading Model" }); | |
| const [weightsArrayU8, tokenizerArrayU8, mel_filtersArrayU8] = | |
| await Promise.all([ | |
| fetchArrayBuffer(weightsURL), | |
| fetchArrayBuffer(tokenizerURL), | |
| fetchArrayBuffer(mel_filtersURL), | |
| ]); | |
| this.instance[modelID] = new Decoder( | |
| weightsArrayU8, | |
| tokenizerArrayU8, | |
| mel_filtersArrayU8 | |
| ); | |
| } else { | |
| self.postMessage({ status: "loading", message: "Model Already Loaded" }); | |
| } | |
| return this.instance[modelID]; | |
| } | |
| } | |
| self.addEventListener("message", async (event) => { | |
| const { weightsURL, modelID, tokenizerURL, mel_filtersURL, audioURL } = | |
| event.data; | |
| try { | |
| self.postMessage({ status: "decoding", message: "Starting Decoder" }); | |
| const decoder = await Whisper.getInstance( | |
| weightsURL, | |
| modelID, | |
| tokenizerURL, | |
| mel_filtersURL | |
| ); | |
| self.postMessage({ status: "decoding", message: "Loading Audio" }); | |
| const audioArrayU8 = await fetchArrayBuffer(audioURL); | |
| self.postMessage({ status: "decoding", message: "Running Decoder..." }); | |
| const segments = decoder.decode(audioArrayU8); | |
| // Send the segment back to the main thread as JSON | |
| self.postMessage({ | |
| status: "complete", | |
| message: "complete", | |
| output: JSON.parse(segments), | |
| }); | |
| } catch (e) { | |
| self.postMessage({ error: e }); | |
| } | |
| }); | |