66 lines
2.4 KiB
JavaScript
66 lines
2.4 KiB
JavaScript
import {TtsSession} from '@mintplex-labs/piper-tts-web';
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import {trackModelDownload} from './piper-download-progress.mjs';
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import {localPiperModelUrl} from './piper-model-routing.mjs';
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import {createOnnxWasmPaths} from './piper-onnx-config.mjs';
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const VOICE_ID = 'sv_SE-nst-medium';
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const ASSET_ROOT = '/static/piper-wasm-v1';
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const localFetch = self.fetch.bind(self);
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// Keep the TTS library's OPFS cache logic, but serve models/config from the
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// same-origin static asset service instead of its built-in external model URL.
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self.fetch = async (resource, options) => {
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const requestedUrl = resource instanceof Request ? resource.url : String(resource);
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const localModelUrl = localPiperModelUrl(requestedUrl, self.location.origin);
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if (!localModelUrl) return localFetch(resource, options);
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const redirected = resource instanceof Request ? new Request(localModelUrl, resource) : localModelUrl;
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const response = await localFetch(redirected, options);
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if (!activeRequestId || !localModelUrl.endsWith('.onnx')) return response;
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return trackModelDownload(response, {
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id: activeRequestId,
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postMessage: message => self.postMessage(message),
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});
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};
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let sessionPromise;
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let inferenceQueue = Promise.resolve();
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let activeRequestId = null;
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async function getSession() {
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if (!sessionPromise) {
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sessionPromise = TtsSession.create({
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voiceId: VOICE_ID,
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wasmPaths: {
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onnxWasm: createOnnxWasmPaths(self.location.origin),
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piperData: `${ASSET_ROOT}/piper/piper_phonemize.data`,
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piperWasm: `${ASSET_ROOT}/piper/piper_phonemize.wasm`,
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},
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}).catch(error => {
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sessionPromise = null;
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throw error;
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});
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}
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return sessionPromise;
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}
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async function synthesizeMessage(event) {
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const {id, text} = event.data || {};
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if (!Number.isSafeInteger(id) || typeof text !== 'string') return;
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activeRequestId = id;
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self.postMessage({id, type: 'progress', progress: {stage: 'starting'}});
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try {
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const session = await getSession();
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const blob = await session.predict(text);
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const audio = await blob.arrayBuffer();
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self.postMessage({id, type: 'audio', audio}, [audio]);
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} catch (error) {
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self.postMessage({id, type: 'error', error: String(error?.message || error)});
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} finally {
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activeRequestId = null;
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}
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}
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self.addEventListener('message', event => {
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inferenceQueue = inferenceQueue.then(() => synthesizeMessage(event));
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});
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