83 lines
2.7 KiB
JavaScript
83 lines
2.7 KiB
JavaScript
// @flow
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import { showWarningNotification } from '../../notifications/actions';
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import logger from '../../virtual-background/logger';
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import JitsiStreamBackgroundEffect from './JitsiStreamBackgroundEffect';
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import createTFLiteModule from './vendor/tflite/tflite';
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import createTFLiteSIMDModule from './vendor/tflite/tflite-simd';
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const models = {
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model96: 'libs/segm_lite_v681.tflite',
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model144: 'libs/segm_full_v679.tflite'
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};
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const segmentationDimensions = {
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model96: {
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height: 96,
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width: 160
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},
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model144: {
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height: 144,
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width: 256
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}
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};
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/**
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* Creates a new instance of JitsiStreamBackgroundEffect. This loads the Meet background model that is used to
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* extract person segmentation.
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*
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* @param {Object} virtualBackground - The virtual object that contains the background image source and
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* the isVirtualBackground flag that indicates if virtual image is activated.
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* @param {Function} dispatch - The Redux dispatch function.
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* @returns {Promise<JitsiStreamBackgroundEffect>}
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*/
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export async function createVirtualBackgroundEffect(virtualBackground: Object, dispatch: Function) {
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if (!MediaStreamTrack.prototype.getSettings && !MediaStreamTrack.prototype.getConstraints) {
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throw new Error('JitsiStreamBackgroundEffect not supported!');
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}
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let tflite;
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let wasmCheck;
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// Checks if WebAssembly feature is supported or enabled by/in the browser.
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// Conditional import of wasm-check package is done to prevent
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// the browser from crashing when the user opens the app.
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try {
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wasmCheck = require('wasm-check');
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if (wasmCheck?.feature?.simd) {
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tflite = await createTFLiteSIMDModule();
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} else {
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tflite = await createTFLiteModule();
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}
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} catch (err) {
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logger.error('Looks like WebAssembly is disabled or not supported on this browser');
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dispatch(showWarningNotification({
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titleKey: 'virtualBackground.webAssemblyWarning',
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description: 'WebAssembly disabled or not supported by this browser'
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}));
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return;
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}
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const modelBufferOffset = tflite._getModelBufferMemoryOffset();
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const modelResponse = await fetch(wasmCheck.feature.simd ? models.model144 : models.model96);
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if (!modelResponse.ok) {
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throw new Error('Failed to download tflite model!');
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}
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const model = await modelResponse.arrayBuffer();
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tflite.HEAPU8.set(new Uint8Array(model), modelBufferOffset);
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tflite._loadModel(model.byteLength);
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const options = {
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...wasmCheck.feature.simd ? segmentationDimensions.model144 : segmentationDimensions.model96,
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virtualBackground
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};
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return new JitsiStreamBackgroundEffect(tflite, options);
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}
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