Get the uncompressed size of WebAudio

logWebAudioStats.js

async function logWebAudioStats( url )
{
    const response = await fetch(url);
    const responseBytes = await response.arrayBuffer();

    // decode audio
    const audioContext = new (window.AudioContext || window.webkitAudioContext)();
    const audioBuffer = await audioContext.decodeAudioData(responseBytes);

    // get statistics
    const { duration, sampleRate, numberOfChannels } = audioBuffer;

    const sizeKB = getWebAudioBufferSizeKB(duration, numberOfChannels, sampleRate);

    console.info("Decoded WebAudio stats:", {
        url,
        sizeKB: sizeKB.toFixed(2) + " kilobytes",
        sizeMB: (sizeKB/1024).toFixed(2) + " megabytes",
        duration,
        sampleRate,
        numberOfChannels,
    });
}

function getWebAudioBufferSizeKB(durationSeconds, numberOfChannels = 1, sampleRate = 44100)
{
    // WebAudio buffers use 4 bytes per sample
    // ttps://github.com/WebAudio/web-audio-api/issues/2396
    const bytesPerSample = 4;

    const sizeBytes = numberOfChannels * durationSeconds * sampleRate * bytesPerSample;
    
    return sizeBytes / 1024;
}