webaudio-examples

Code examples that accompany the MDN Web Audio documentation https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API

Audio analyser

The audio-analyser directory contains a very simple example showing a graphical visualization of an audio signal drawn with data taken from an AnalyserNode interface. Run the demo live.

Audio basics

The audio-basics directory contains a fun example showing a retro-style “boombox” that allows audio to be played, stereo-panned, and volume-adjusted. Run the demo live.

Audio buffer

The audio-buffer directory contains a very simple example showing how to use an AudioBuffer interface in the Web Audio API. Run the demo live.

Audio param

The audio-param directory contains some simple examples showing how to use the methods of the Web Audio API AudioParam interface. Run example live.

Audio context states

The audiocontext-states directory contains a simple demo of the new Web Audio API AudioContext methods, including the states property and the close(), resume(), and suspend() methods. Run the demo live.

Audio worklet

The audioworklet directory contains an example showing how to use the AudioWorklet interface. See also the guide on background audio processing using AudioWorklet. Run the example live.

Compressor example

The compressor-example directory contains a simple demo to show usage of the Web Audio API BaseAudioContext.createDynamicsCompressor() method and DynamicsCompressorNode interface. Run the example live.

Create media stream destination

The create-media-stream-destination directory contains a simple example showing how the Web Audio API AudioContext.createMediaStreamDestination() method can be used to output a stream - in this case to a MediaRecorder instance - to output a sinewave to an opus file. Run the demo live.

Decode audio data

The decode-audio-data directory contains a simple example demonstrating usage of the Web Audio API BaseAudioContext.decodeAudioData() method. View example live.

IIR filter node

The iirfilter-node directory contains an example showing usage of an IIRFilterNode interface. Run the demo live.

Media source buffer

The media-source-buffer directory contains a simple example demonstrating usage of the Web Audio API AudioContext.createMediaElementSource() method. View the demo live.

Multi track

The multi-track directory contains an example of connecting separate independently-playable audio tracks to a single AudioDestinationNode interface. Run the example live.

Offline audio context

The offline-audio-context directory contains a simple example to show how a Web Audio API OfflineAudioContext interface can be used to rapidly process/render audio in the background to create a buffer, which can then be used in any way you please. For more information, see https://developer.mozilla.org/en-US/docs/Web/API/OfflineAudioContext. Run example live.

Offline audio context promise

The offline-audio-context-promise directory contains a simple example to show how a Web Audio API OfflineAudioContext interface can be used to rapidly process/render audio in the background to create a buffer, which can then be used in any way you please. Run the example live.

Output timestamp

The output-timestamp directory contains an example of how the AudioContext.getOutputTimestamp() property can be used to log contextTime and performanceTime to the console. Try the demo live.

Panner node

The panner-node directory contains a demo to show basic usage of the Web Audio API BaseAudioContext.createPanner() method to control audio spatialization. Run the example live.

Script processor node

The script-processor-node directory contains a simple demo showing how to use the Web Audio API’s ScriptProcessorNode interface to process a loaded audio track, adding a little bit of white noise to each audio sample. See the live demo.

Spacialization

The spacialization directory contains an example of how the various properties of a PannerNode interface can be adjusted to emulate sound in a three-dimensional space. For more information see Web audio spatialization basics. Try the live demo.

Step sequencer

The step-sequencer directory contains a simple step-sequencer that loops and manipulates sounds based on a dial-up modem. For more information see Advanced techniques: creating sound, sequencing, timing, scheduling. See the live demo also.

Stereo panner node

The stereo-panner-node directory contains a simple example to show how the Web Audio API StereoPannerNode interface can be used to pan an audio stream. Run the example live.

Stream source buffer

The stream-source-buffer directory contains a simple example demonstrating usage of the Web Audio API AudioContext.createMediaElementSource() method. View example live.