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LibWeb/WebAudio: Define and partially implement AnalyserNode

Browse source 
https://webaudio.github.io/web-audio-api/#AnalyserNode

Most of the interface is naively implemented. Container types
probably need adjusted (Vector<double> is used for all the processing).
A Fourier Transform is needed, but that's waiting on either a 3rd
party library or a complex number type.

There are lots of simple miscellaneous filters that need to be applied.
It could be reasonable to implement from scratch, supposing that
it can be parallelized. It might be hard to find one library with
everything. Not my call though.

Some additional scaffolding around blocks and render quanta is
probably needed before this is developed much further, which
probably comes in at the level of the AudioNode.

Co-authored-by: Tim Ledbetter <tim.ledbetter@ladybird.org>
This commit is contained in:
Noah Bright 2024-09-18 09:09:18 -04:00 • committed by Andreas Kling
commit 6c6bf322ea
Notes: github-actions[bot] 2025-01-17 09:15:57 +00:00
16 changed files with 911 additions and 5 deletions
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25
Libraries/LibWeb/WebAudio/AnalyserNode.idl Normal file
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#import <WebAudio/AudioNode.idl>
#import <WebAudio/BaseAudioContext.idl>
// https://webaudio.github.io/web-audio-api/#AnalyserOptions
dictionary AnalyserOptions : AudioNodeOptions {
unsigned long fftSize = 2048;
double maxDecibels = -30;
double minDecibels = -100;
double smoothingTimeConstant = 0.8;
};
// https://webaudio.github.io/web-audio-api/#AnalyserNode
[Exposed=Window]
interface AnalyserNode : AudioNode {
constructor (BaseAudioContext context, optional AnalyserOptions options = {});
undefined getFloatFrequencyData (Float32Array array);
undefined getByteFrequencyData (Uint8Array array);
undefined getFloatTimeDomainData (Float32Array array);
undefined getByteTimeDomainData (Uint8Array array);
attribute unsigned long fftSize;
readonly attribute unsigned long frequencyBinCount;
attribute double minDecibels;
attribute double maxDecibels;
attribute double smoothingTimeConstant;
};