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Showing content from https://rustwasm.github.io/docs/wasm-bindgen/examples/wasm-audio-worklet.html below:

Wasm Audio Worklet - The `wasm-bindgen` Guide

1. Introduction
3. 1. Examples
4. 1. 1.1. Hello, World!
   2. 1.2. Using console.log
   3. 1.3. Small Wasm files
   4. 1.4. Without a Bundler
   5. 1.5. Synchronous Instantiation
   6. 1.6. Importing functions from JS
   7. 1.7. Working with char
   8. 1.8. js-sys: WebAssembly in WebAssembly
   9. 1.9. web-sys: DOM hello world
   10. 1.10. web-sys: Closures
   11. 1.11. web-sys: performance.now
   12. 1.12. web-sys: using fetch
   13. 1.13. web-sys: Weather report
   14. 1.14. web-sys: canvas hello world
   15. 1.15. web-sys: canvas Julia set
   16. 1.16. web-sys: WebAudio
   17. 1.17. web-sys: WebGL
   18. 1.18. web-sys: WebSockets
   19. 1.19. web-sys: WebRTC DataChannel
   20. 1.20. web-sys: requestAnimationFrame
   21. 1.21. web-sys: A Simple Paint Program
   22. 1.22. web-sys: Wasm in Web Worker
   23. 1.23. Parallel Raytracing
   24. 1.24. Wasm Audio Worklet
   25. 1.25. web-sys: A TODO MVC App
5. 2. Reference
6. 1. 2.1. Deployment
   2. 2.2. JS snippets
   3. 2.3. Static JS Objects
   4. 2.4. Passing Rust Closures to JS
   5. 2.5. Receiving JS Closures in Rust
   6. 2.6. Promises and Futures
   7. 2.7. Iterating over JS Values
   8. 2.8. Arbitrary Data with Serde
   9. 2.9. Accessing Properties of Untyped JS Values
   10. 2.10. Working with Duck-Typed Interfaces
   11. 2.11. Command Line Interface
   12. 2.12. Optimizing for Size
   13. 2.13. Supported Rust Targets
   14. 2.14. Supported Browsers
   15. 2.15. Support for Weak References
   16. 2.16. Support for Reference Types
   17. 2.17. Supported Types
   18. 1. 2.17.1. Imported JavaScript Types
       2. 2.17.2. Exported Rust Types
       3. 2.17.3. JsValue
       4. 2.17.4. Box<[T]> and Vec
       5. 2.17.5. *const T and *mut T
       6. 2.17.6. NonNull
       7. 2.17.7. Numbers
       8. 2.17.8. bool
       9. 2.17.9. char
       10. 2.17.10. str
       11. 2.17.11. String
       12. 2.17.12. Number Slices
       13. 2.17.13. Boxed Number Slices
       14. 2.17.14. Result<T, E>
   19. 2.18. #[wasm_bindgen] Attributes
   20. 1. 2.18.1. On JavaScript Imports
       2. 1. 2.18.1.1. catch
          2. 2.18.1.2. constructor
          3. 2.18.1.3. extends
          4. 2.18.1.4. getter and setter
          5. 2.18.1.5. final
          6. 2.18.1.6. indexing_getter, indexing_setter, and indexing_deleter
          7. 2.18.1.7. js_class = "Blah"
          8. 2.18.1.8. js_name
          9. 2.18.1.9. js_namespace
          10. 2.18.1.10. method
          11. 2.18.1.11. module = "blah"
          12. 2.18.1.12. raw_module = "blah"
          13. 2.18.1.13. no_deref
          14. 2.18.1.14. static_method_of = Blah
          15. 2.18.1.15. structural
          16. 2.18.1.16. typescript_type
          17. 2.18.1.17. variadic
          18. 2.18.1.18. vendor_prefix
       3. 2.18.2. On Rust Exports
       4. 1. 2.18.2.1. constructor
          2. 2.18.2.2. js_name = Blah
          3. 2.18.2.3. js_class = Blah
          4. 2.18.2.4. readonly
          5. 2.18.2.5. skip
          6. 2.18.2.6. skip_jsdoc
          7. 2.18.2.7. start
          8. 2.18.2.8. main
          9. 2.18.2.9. typescript_custom_section
          10. 2.18.2.10. getter and setter
          11. 2.18.2.11. inspectable
          12. 2.18.2.12. skip_typescript
          13. 2.18.2.13. getter_with_clone
          14. 2.18.2.14. unchecked_return_type and unchecked_param_type
          15. 2.18.2.15. return_description and param_description
7. 3. web-sys
8. 1. 3.1. Using web-sys
   2. 3.2. Cargo Features
   3. 3.3. Function Overloads
   4. 3.4. Type Translations
   5. 3.5. Inheritance
   6. 3.6. Unstable APIs
9. 4. Testing with wasm-bindgen-test
10. 1. 4.1. Usage
    2. 4.2. Writing Asynchronous Tests
    3. 4.3. Testing in Headless Browsers
    4. 4.4. Continuous Integration
    5. 4.5. Coverage (Experimental)
11. 5. Contributing to wasm-bindgen
12. 1. 5.1. Testing
    2. 5.2. Internal Design
    3. 1. 5.2.1. JS Objects in Rust
       2. 5.2.2. Exporting a function to JS
       3. 5.2.3. Exporting a struct to JS
       4. 5.2.4. Importing a function from JS
       5. 5.2.5. Importing a class from JS
       6. 5.2.6. Rust Type conversions
       7. 5.2.7. Types in wasm-bindgen
    4. 5.3. js-sys
    5. 1. 5.3.1. Testing
       2. 5.3.2. Adding More APIs
    6. 5.4. web-sys
    7. 1. 5.4.1. Overview
       2. 5.4.2. Testing
       3. 5.4.3. Logging
       4. 5.4.4. Supporting More Web APIs
    8. 5.5. Publishing
    9. 5.6. Team

View full source code or view the compiled example online

This is an example of using threads inside specific worklets with WebAssembly, Rust, and wasm-bindgen, culminating in an oscillator demo. This demo should complement the parallel-raytrace example by demonstrating an alternative approach using ES modules with on-the-fly module creation.

One of the major gotchas with threaded WebAssembly is that Rust does not ship a precompiled target (e.g. standard library) which has threading support enabled. This means that you'll need to recompile the standard library with the appropriate rustc flags, namely -C target-feature=+atomics,+bulk-memory,+mutable-globals. Note that this requires a nightly Rust toolchain. See the more detailed instructions of the parallel-raytrace example.

This example shares most of its caveats with the parallel-raytrace example. However, it tries to encapsulate worklet creation in a Rust module, so the application developer does not need to maintain custom JS code.

This demo should work in the latest Chrome, Firefox and Safari versions at this time. Note that this example requires HTTP headers to be set like in parallel-raytrace.

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