131 lines
4.1 KiB
TypeScript
131 lines
4.1 KiB
TypeScript
/**
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* Copyright 2022 The MediaPipe Authors. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Placeholder for internal dependency on trusted resource URL builder
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import {WasmFileset} from './wasm_fileset';
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let supportsSimd: boolean|undefined;
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/**
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* Simple WASM program to test compatibility with the M91 instruction set.
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* Compiled from
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* https://github.com/GoogleChromeLabs/wasm-feature-detect/blob/main/src/detectors/simd/module.wat
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*/
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const WASM_SIMD_CHECK = new Uint8Array([
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0, 97, 115, 109, 1, 0, 0, 0, 1, 5, 1, 96, 0, 1, 123, 3,
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2, 1, 0, 10, 10, 1, 8, 0, 65, 0, 253, 15, 253, 98, 11
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]);
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async function isSimdSupported(): Promise<boolean> {
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if (supportsSimd === undefined) {
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try {
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await WebAssembly.instantiate(WASM_SIMD_CHECK);
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supportsSimd = true;
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} catch {
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supportsSimd = false;
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}
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}
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return supportsSimd;
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}
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async function createFileset(
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taskName: string, basePath: string = '.'): Promise<WasmFileset> {
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if (await isSimdSupported()) {
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return {
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wasmLoaderPath:
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`/${basePath}/${taskName}_wasm_internal.js`,
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wasmBinaryPath:
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`/${basePath}/${taskName}_wasm_internal.wasm`,
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};
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} else {
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return {
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wasmLoaderPath:
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`/${basePath}/${taskName}_wasm_nosimd_internal.js`,
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wasmBinaryPath: `/${basePath}/${
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taskName}_wasm_nosimd_internal.wasm`,
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};
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}
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}
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// tslint:disable:class-as-namespace
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/**
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* Resolves the files required for the MediaPipe Task APIs.
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*
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* This class verifies whether SIMD is supported in the current environment and
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* loads the SIMD files only if support is detected. The returned filesets
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* require that the Wasm files are published without renaming. If this is not
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* possible, you can invoke the MediaPipe Tasks APIs using a manually created
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* `WasmFileset`.
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*/
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export class FilesetResolver {
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/**
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* Returns whether SIMD is supported in the current environment.
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*
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* If your environment requires custom locations for the MediaPipe Wasm files,
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* you can use `isSimdSupported()` to decide whether to load the SIMD-based
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* assets.
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*
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* @return Whether SIMD support was detected in the current environment.
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*/
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static isSimdSupported(): Promise<boolean> {
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return isSimdSupported();
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}
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/**
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* Creates a fileset for the MediaPipe Audio tasks.
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*
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* @param basePath An optional base path to specify the directory the Wasm
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* files should be loaded from. If not specified, the Wasm files are
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* loaded from the host's root directory.
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* @return A `WasmFileset` that can be used to initialize MediaPipe Audio
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* tasks.
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*/
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static forAudioTasks(basePath?: string): Promise<WasmFileset> {
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return createFileset('audio', basePath);
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}
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/**
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* Creates a fileset for the MediaPipe Text tasks.
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*
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* @param basePath An optional base path to specify the directory the Wasm
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* files should be loaded from. If not specified, the Wasm files are
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* loaded from the host's root directory.
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* @return A `WasmFileset` that can be used to initialize MediaPipe Text
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* tasks.
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*/
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static forTextTasks(basePath?: string): Promise<WasmFileset> {
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return createFileset('text', basePath);
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}
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/**
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* Creates a fileset for the MediaPipe Vision tasks.
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*
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* @param basePath An optional base path to specify the directory the Wasm
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* files should be loaded from. If not specified, the Wasm files are
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* loaded from the host's root directory.
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* @return A `WasmFileset` that can be used to initialize MediaPipe Vision
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* tasks.
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*/
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static forVisionTasks(basePath?: string): Promise<WasmFileset> {
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return createFileset('vision', basePath);
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}
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}
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