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<ol class="chapter"><li class="affix"><a href="../introduction.html">Introduction</a></li><li class="spacer"></li><li><a href="../examples/index.html"><strong aria-hidden="true">1.</strong> Examples</a></li><li><ol class="section"><li><a href="../examples/hello-world.html"><strong aria-hidden="true">1.1.</strong> Hello, World!</a></li><li><a href="../examples/console-log.html"><strong aria-hidden="true">1.2.</strong> Using console.log</a></li><li><a href="../examples/add.html"><strong aria-hidden="true">1.3.</strong> Small wasm files</a></li><li><a href="../examples/without-a-bundler.html"><strong aria-hidden="true">1.4.</strong> Without a Bundler</a></li><li><a href="../examples/wasm2js.html"><strong aria-hidden="true">1.5.</strong> Converting WebAssembly to JS</a></li><li><a href="../examples/import-js.html"><strong aria-hidden="true">1.6.</strong> Importing functions from JS</a></li><li><a href="../examples/char.html"><strong aria-hidden="true">1.7.</strong> Working with char</a></li><li><a href="../examples/wasm-in-wasm.html"><strong aria-hidden="true">1.8.</strong> js-sys: WebAssembly in WebAssembly</a></li><li><a href="../examples/dom.html"><strong aria-hidden="true">1.9.</strong> web-sys: DOM hello world</a></li><li><a href="../examples/closures.html"><strong aria-hidden="true">1.10.</strong> web-sys: Closures</a></li><li><a href="../examples/performance.html"><strong aria-hidden="true">1.11.</strong> web-sys: performance.now</a></li><li><a href="../examples/fetch.html"><strong aria-hidden="true">1.12.</strong> web-sys: using fetch</a></li><li><a href="../examples/2d-canvas.html"><strong aria-hidden="true">1.13.</strong> web-sys: canvas hello world</a></li><li><a href="../examples/julia.html"><strong aria-hidden="true">1.14.</strong> web-sys: canvas Julia set</a></li><li><a href="../examples/web-audio.html" class="active"><strong aria-hidden="true">1.15.</strong> web-sys: WebAudio</a></li><li><a href="../examples/webgl.html"><strong aria-hidden="true">1.16.</strong> web-sys: WebGL</a></li><li><a href="../examples/websockets.html"><strong aria-hidden="true">1.17.</strong> web-sys: WebSockets</a></li><li><a href="../examples/webrtc_datachannel.html"><strong aria-hidden="true">1.18.</strong> web-sys: WebRTC DataChannel</a></li><li><a href="../examples/request-animation-frame.html"><strong aria-hidden="true">1.19.</strong> web-sys: requestAnimationFrame</a></li><li><a href="../examples/paint.html"><strong aria-hidden="true">1.20.</strong> web-sys: A Simple Paint Program</a></li><li><a href="../examples/raytrace.html"><strong aria-hidden="true">1.21.</strong> Parallel Raytracing</a></li><li><a href="../examples/todomvc.html"><strong aria-hidden="true">1.22.</strong> web-sys: A TODO MVC App</a></li></ol></li><li><a href="../reference/index.html"><strong aria-hidden="true">2.</strong> Reference</a></li><li><ol class="section"><li><a href="../reference/deployment.html"><strong aria-hidden="true">2.1.</strong> Deployment</a></li><li><a href="../reference/js-snippets.html"><strong aria-hidden="true">2.2.</strong> JS snippets</a></li><li><a href="../reference/passing-rust-closures-to-js.html"><strong aria-hidden="true">2.3.</strong> Passing Rust Closures to JS</a></li><li><a href="../reference/receiving-js-closures-in-rust.html"><strong aria-hidden="true">2.4.</strong> Receiving JS Closures in Rust</a></li><li><a href="../reference/js-promises-and-rust-futures.html"><strong aria-hidden="true">2.5.</strong> Promises and Futures</a></li><li><a href="../reference/iterating-over-js-values.html"><strong aria-hidden="true">2.6.</strong> Iterating over JS Values</a></li><li><a href="../reference/arbitrary-data-with-serde.html"><strong aria-hidden="true">2.7.</strong> Arbitrary Data with Serde</a></li><li><a href="../reference/accessing-properties-of-untyped-js-values.html"><strong aria-hidden="true">2.8.</strong> Accessing Properties of Untyped JS Values</a></li><li><a href="../reference/working-with-duck-typed-interfaces.html"><strong aria-hidden="true">2.9.</strong> Working with Duck-Typed Interfaces</a></li><li>
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This is the <strong>unpublished</strong> documentation of
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<code>wasm-bindgen</code>, the published documentation is available
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on the main Rust and WebAssembly documentation site
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<h1 class="menu-title">The `wasm-bindgen` Guide</h1>
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<main>
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<h1><a class="header" href="#webaudio" id="webaudio">WebAudio</a></h1>
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<p><a href="https://github.com/rustwasm/wasm-bindgen/tree/master/examples/webaudio">View full source code</a> or <a href="https://rustwasm.github.io/wasm-bindgen/exbuild/webaudio/">view the compiled example online</a></p>
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<p>This example creates an <a href="https://en.wikipedia.org/wiki/Frequency_modulation_synthesis">FM
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oscillator</a> using
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the <a href="https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API">WebAudio
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API</a> and
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<code>web-sys</code>.</p>
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<h2><a class="header" href="#cargotoml" id="cargotoml"><code>Cargo.toml</code></a></h2>
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<p>The <code>Cargo.toml</code> enables the types needed to use the relevant bits of the
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WebAudio API.</p>
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<pre><code class="language-toml">[package]
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name = "webaudio"
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version = "0.1.0"
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authors = ["The wasm-bindgen Developers"]
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edition = "2018"
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[lib]
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crate-type = ["cdylib"]
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[dependencies]
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wasm-bindgen = "0.2.63"
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[dependencies.web-sys]
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version = "0.3.4"
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features = [
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'AudioContext',
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'AudioDestinationNode',
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'AudioNode',
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'AudioParam',
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'GainNode',
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'OscillatorNode',
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'OscillatorType',
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]
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</code></pre>
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<h2><a class="header" href="#srclibrs" id="srclibrs"><code>src/lib.rs</code></a></h2>
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<p>The Rust code implements the FM oscillator.</p>
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<pre><pre class="playpen"><code class="language-rust">
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# #![allow(unused_variables)]
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#fn main() {
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use wasm_bindgen::prelude::*;
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use web_sys::{AudioContext, OscillatorType};
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/// Converts a midi note to frequency
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///
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/// A midi note is an integer, generally in the range of 21 to 108
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pub fn midi_to_freq(note: u8) -> f32 {
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27.5 * 2f32.powf((note as f32 - 21.0) / 12.0)
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}
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#[wasm_bindgen]
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pub struct FmOsc {
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ctx: AudioContext,
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/// The primary oscillator. This will be the fundamental frequency
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primary: web_sys::OscillatorNode,
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/// Overall gain (volume) control
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gain: web_sys::GainNode,
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/// Amount of frequency modulation
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fm_gain: web_sys::GainNode,
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/// The oscillator that will modulate the primary oscillator's frequency
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fm_osc: web_sys::OscillatorNode,
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/// The ratio between the primary frequency and the fm_osc frequency.
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///
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/// Generally fractional values like 1/2 or 1/4 sound best
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fm_freq_ratio: f32,
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fm_gain_ratio: f32,
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}
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impl Drop for FmOsc {
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fn drop(&mut self) {
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let _ = self.ctx.close();
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}
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}
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#[wasm_bindgen]
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impl FmOsc {
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#[wasm_bindgen(constructor)]
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pub fn new() -> Result<FmOsc, JsValue> {
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let ctx = web_sys::AudioContext::new()?;
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// Create our web audio objects.
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let primary = ctx.create_oscillator()?;
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let fm_osc = ctx.create_oscillator()?;
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let gain = ctx.create_gain()?;
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let fm_gain = ctx.create_gain()?;
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// Some initial settings:
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primary.set_type(OscillatorType::Sine);
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primary.frequency().set_value(440.0); // A4 note
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|
|
gain.gain().set_value(0.0); // starts muted
|
||
|
|
fm_gain.gain().set_value(0.0); // no initial frequency modulation
|
||
|
|
fm_osc.set_type(OscillatorType::Sine);
|
||
|
|
fm_osc.frequency().set_value(0.0);
|
||
|
|
|
||
|
|
// Connect the nodes up!
|
||
|
|
|
||
|
|
// The primary oscillator is routed through the gain node, so that
|
||
|
|
// it can control the overall output volume.
|
||
|
|
primary.connect_with_audio_node(&gain)?;
|
||
|
|
|
||
|
|
// Then connect the gain node to the AudioContext destination (aka
|
||
|
|
// your speakers).
|
||
|
|
gain.connect_with_audio_node(&ctx.destination())?;
|
||
|
|
|
||
|
|
// The FM oscillator is connected to its own gain node, so it can
|
||
|
|
// control the amount of modulation.
|
||
|
|
fm_osc.connect_with_audio_node(&fm_gain)?;
|
||
|
|
|
||
|
|
// Connect the FM oscillator to the frequency parameter of the main
|
||
|
|
// oscillator, so that the FM node can modulate its frequency.
|
||
|
|
fm_gain.connect_with_audio_param(&primary.frequency())?;
|
||
|
|
|
||
|
|
// Start the oscillators!
|
||
|
|
primary.start()?;
|
||
|
|
fm_osc.start()?;
|
||
|
|
|
||
|
|
Ok(FmOsc {
|
||
|
|
ctx,
|
||
|
|
primary,
|
||
|
|
gain,
|
||
|
|
fm_gain,
|
||
|
|
fm_osc,
|
||
|
|
fm_freq_ratio: 0.0,
|
||
|
|
fm_gain_ratio: 0.0,
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Sets the gain for this oscillator, between 0.0 and 1.0.
|
||
|
|
#[wasm_bindgen]
|
||
|
|
pub fn set_gain(&self, mut gain: f32) {
|
||
|
|
if gain > 1.0 {
|
||
|
|
gain = 1.0;
|
||
|
|
}
|
||
|
|
if gain < 0.0 {
|
||
|
|
gain = 0.0;
|
||
|
|
}
|
||
|
|
self.gain.gain().set_value(gain);
|
||
|
|
}
|
||
|
|
|
||
|
|
#[wasm_bindgen]
|
||
|
|
pub fn set_primary_frequency(&self, freq: f32) {
|
||
|
|
self.primary.frequency().set_value(freq);
|
||
|
|
|
||
|
|
// The frequency of the FM oscillator depends on the frequency of the
|
||
|
|
// primary oscillator, so we update the frequency of both in this method.
|
||
|
|
self.fm_osc.frequency().set_value(self.fm_freq_ratio * freq);
|
||
|
|
self.fm_gain.gain().set_value(self.fm_gain_ratio * freq);
|
||
|
|
}
|
||
|
|
|
||
|
|
#[wasm_bindgen]
|
||
|
|
pub fn set_note(&self, note: u8) {
|
||
|
|
let freq = midi_to_freq(note);
|
||
|
|
self.set_primary_frequency(freq);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// This should be between 0 and 1, though higher values are accepted.
|
||
|
|
#[wasm_bindgen]
|
||
|
|
pub fn set_fm_amount(&mut self, amt: f32) {
|
||
|
|
self.fm_gain_ratio = amt;
|
||
|
|
|
||
|
|
self.fm_gain
|
||
|
|
.gain()
|
||
|
|
.set_value(self.fm_gain_ratio * self.primary.frequency().value());
|
||
|
|
}
|
||
|
|
|
||
|
|
/// This should be between 0 and 1, though higher values are accepted.
|
||
|
|
#[wasm_bindgen]
|
||
|
|
pub fn set_fm_frequency(&mut self, amt: f32) {
|
||
|
|
self.fm_freq_ratio = amt;
|
||
|
|
self.fm_osc
|
||
|
|
.frequency()
|
||
|
|
.set_value(self.fm_freq_ratio * self.primary.frequency().value());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#}</code></pre></pre>
|
||
|
|
<h2><a class="header" href="#indexjs" id="indexjs"><code>index.js</code></a></h2>
|
||
|
|
<p>A small bit of JavaScript glues the rust module to input widgets and translates
|
||
|
|
events into calls into wasm code.</p>
|
||
|
|
<pre><code class="language-js">import('./pkg')
|
||
|
|
.then(rust_module => {
|
||
|
|
let fm = null;
|
||
|
|
|
||
|
|
const play_button = document.getElementById("play");
|
||
|
|
play_button.addEventListener("click", event => {
|
||
|
|
if (fm === null) {
|
||
|
|
fm = new rust_module.FmOsc();
|
||
|
|
fm.set_note(50);
|
||
|
|
fm.set_fm_frequency(0);
|
||
|
|
fm.set_fm_amount(0);
|
||
|
|
fm.set_gain(0.8);
|
||
|
|
} else {
|
||
|
|
fm.free();
|
||
|
|
fm = null;
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
const primary_slider = document.getElementById("primary_input");
|
||
|
|
primary_slider.addEventListener("input", event => {
|
||
|
|
if (fm) {
|
||
|
|
fm.set_note(parseInt(event.target.value));
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
const fm_freq = document.getElementById("fm_freq");
|
||
|
|
fm_freq.addEventListener("input", event => {
|
||
|
|
if (fm) {
|
||
|
|
fm.set_fm_frequency(parseFloat(event.target.value));
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
const fm_amount = document.getElementById("fm_amount");
|
||
|
|
fm_amount.addEventListener("input", event => {
|
||
|
|
if (fm) {
|
||
|
|
fm.set_fm_amount(parseFloat(event.target.value));
|
||
|
|
}
|
||
|
|
});
|
||
|
|
})
|
||
|
|
.catch(console.error);
|
||
|
|
|
||
|
|
</code></pre>
|
||
|
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|
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|
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