Snippet

TypedArray and ArrayBuffer Processing within Custom React Hooks

Handling binary network or media payloads in React requires working with TypedArrays like Float32Array and ArrayBuffers. Converting binary buffers into JS Arrays allows leveraging array methods like filter and reduce for DSP analysis before committing results to state.

snippet.js

javascript

import { useState, useCallback } from 'react';
 
export function useAudioBufferProcessor(sampleRate = 44100) {
  const [audioChunks, setAudioChunks] = useState([]);
 
  const processRawBytes = useCallback((arrayBuffer) => {
    const float32Data = new Float32Array(arrayBuffer);
    const windowedSamples = Array.from(float32Data).filter((sample, idx) => idx % 2 === 0);
    
    const peakAmplitude = windowedSamples.reduce((max, current) => 
      Math.abs(current) > max ? Math.abs(current) : max, 0
    );
 
    setAudioChunks(prev => prev.concat({ peakAmplitude, length: windowedSamples.length }));
  }, []);
 
  return { audioChunks, processRawBytes };
}

react

Breakdown

const float32Data = new Float32Array(arrayBuffer);

Creates a TypedArray view over the raw ArrayBuffer to interpret binary data as 32-bit floating point numbers.

const windowedSamples = Array.from(float32Data).filter((sample, idx) => idx % 2 === 0);

Converts the TypedArray to a standard JavaScript Array and downsamples data by filtering odd indices.

const peakAmplitude = windowedSamples.reduce((max, current) => ...

Uses the Array.prototype.reduce method to aggregate and find the maximum absolute signal amplitude.

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TypedArray and ArrayBuffer Processing within Custom React Hooks

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