IAMF Binaural Web Demo

What is IAMF?

IAMF is a new open source spatial audio format from Alliance for Open Media that enables immersive audio experiences. IAMF specifies the audio compression and rendering that every compatible device should implement, from living-room devices to mobile and web.

About this demo

This is a demo of the iamf_tools decoder compiled into WebAssembly and decoding IAMF in the browser.

To get the spatial, binaural audio experience and hear the direction of sounds, you need to both use headphones and to use an IAMF file that has the headphones_rendering_mode set to HEADPHONES_RENDERING_MODE_BINAURAL.

Things to listen for:

Regular stereo playback in headphones is often described as hearing the sounds "inside your head" or "between your ears."
Binaural playback creates the perception of sounds originating outside your head, similar to natural hearing.
Sounds will be perceived as having directionality, such as behind, above, below, or even moving around you.
IAMF can utilize ambisonic sound fields, creating a spherical auditory experience. Some audio samples will effectively demonstrate this immersive sound sphere.

How to run the demo:

Choose a file from the dropdown menu to start decoding. (Please be patient as decoding time may vary depending on your machine's processing power and the file's length and type of content.) Alternatively, you can drag and drop your own IAMF file for decoding.
With your headphones on, play the stereo and binaural versions to hear the differences in immersion, directionality, and fullness.

Note: This demo does not support IAMF files using AAC encoded audio.

Questions or feedback: Please file an issue on GitHub.

Settings

Or drag and drop an audio IAMF file

Drag and drop here

Note: MP4 files or standalone .iamf files are supported. Very large files (> 1GB) may exhaust the browser sandbox's memory.

Advanced settings

These settings are for debugging and testing purposes.

Controls the loudspeaker decoding layout. Depending on OS and browser, many layouts may not be able to be played, but all can be downloaded as a wave file by checking the "Show audio files" box below.

Optionally, specify an ID to decode a specific Mix Presentation. If invalid or blank, the decoder will use default behaviour. Mix Presentations can be seen in the browser console log messages.

Controls the order of the audio channels in the output.

By checking this box, you can access the loudspeaker and binaural audio elements to download audio.

Show audio files

Audio Playback

After a file is finished decoding, you can listen to the results here.

You can click the [Stereo] and [Binaural] buttons to switch between the binaural and stereo versions and hear the difference in spatalization.

Clicking on the waveform/timeline allows you to jump to a particular point and clicking and dragging allows you to select a section for looping.

Remember to use headphones!