wrappingS-WEBA.js File Reference

Wrappers for Web Audio API. More...

Functions
function	audioFarbleInt (array)
function	whiteNoiseInt (array)
function	whiteNoiseFloat (array)

Variables
var	audioFarbleBody = audioFarble
var	wrappers

Detailed Description

Wrappers for Web Audio API.

See also

https://webaudio.github.io/web-audio-api

Author

Copyright (C) 2021 Matus Svancar

Copyright (C) 2023 Martin Zmitko

License:

SPDX-License-Identifier: GPL-3.0-or-later

License:

SPDX-License-Identifier: MPL-2.0

This file contains wrappers for AudioBuffer and AnalyserNode related calls

• https://developer.mozilla.org/en-US/docs/Web/API/AudioBuffer
• https://developer.mozilla.org/en-US/docs/Web/API/AnalyserNode

The goal is to prevent fingerprinting by modifying the values from functions which are reading/copying from AudioBuffer and AnalyserNode. So the audio content of wrapped objects is the same as intended.

The modified content can be either a white noise based on domain key or a fake audio data that is modified according to domain key to be different than the original albeit very similar (i.e. the approach inspired by the algorithms created by Brave Software https://brave.com available at https://github.com/brave/brave-core/blob/master/chromium_src/third_party/blink/renderer/core/execution_context/execution_context.cc.)

Note

Both approaches are detectable by a fingerprinter that checks if a predetermined audio is the same as the read one. Nevertheless, the aim of the wrappers is to limit the finerprintability.

Bug:

Possibly inconsistant data between AudioBuffer and AnalyserNode wrappers.

Bug:

Inconsistency between AudioBuffer.prototype.copyFromChannel and AudioBuffer.prototype.getChannelData. AudioBuffer.prototype.copyFromChannel should call AudioBuffer.prototype.getChannelData wrapper and then return result of the original call.

Function Documentation

audioFarbleInt()

function audioFarbleInt

(

array

)

Here is the call graph for this function:

whiteNoiseFloat()

function whiteNoiseFloat

(

array

)

whiteNoiseInt()

function whiteNoiseInt

(

array

)

Variable Documentation

audioFarbleBody

String audioFarbleBody = audioFarble

Contains functions for modyfing audio data according to chosen level of protection - (0) - replace by white noise (range <0,0.1>) based on domain key (1) - multiply array by fudge factor based on domain key

wrappers

var wrappers