Blazor play generated sound without file

Question

In a Blazor project I generate sound/noise signals as @DanW 's pink noise example, that generates a double[] with values between -1.0 - 1.0. Is it possible to play this array directly as audio in the browser? All I have found about sound/audio and browsers so far has been playing audio from an existing file.

EDIT: I am doing some filtering using some native dll's in C# and am more comfortable in c# than in javascript, hence trying to do most work in C# and not javascript.

Answer 1

So I managed with the WebAudio API to figure out how to:

Javascript:

// for cross browser compatibility
const AudioContext = window.AudioContext || window.webkitAudioContext;
audioCtx = {};

function initAudio() {
    // creation of audio context cannot not be done on loading file, must be done afterwards
    audioCtx = new AudioContext();
    return audioCtx.sampleRate;
}

// floats is a 1-D array with channel data after each other:
// ch1 = floats.slice(0,nSamples)
// ch2 = floats.slice(nSamples,nSamples*2)
function playNoise(floats, nChannels) {
    const bufferSize = floats.length / nChannels;
    let arrayBuffer = audioCtx.createBuffer(nChannels, bufferSize, audioCtx.sampleRate);

    for (var i = 0; i < nChannels; i++) {
        let f32arr = new Float32Array(floats.slice(i * bufferSize, (i + 1) * bufferSize));
        arrayBuffer.copyToChannel(f32arr, i, 0);
    }

    // Creating AudioBufferSourceNode
    let noise = audioCtx.createBufferSource();
    noise.buffer = arrayBuffer;
    noise.connect(audioCtx.destination);
    noise.start();
    return true;
}

Blazor page (I use Blazorise (Button)):

@page "/Tests"
@inject IJSRuntime js
<h3>Test</h3>
<Button Clicked="@(async () => await TestJS())" Color="Color.Primary">Test JS</Button>

@code {
    double fs;
    protected override async Task OnInitializedAsync()
    {
        fs = await js.InvokeAsync<double>("initAudio");
        await base.OnInitializedAsync();
    }

    private async Task TestJS()
    {
        var nChannels = 2;
        var nSecs = 5;
        var nSampels = (int)fs * nSecs * nChannels;
        var floats = new float[nSampels];
        var freq = 440;
        for (int i = 0; i < nSampels / nChannels; i++)
        {
            floats[i] = (float)Math.Sin(i * freq * 2 * Math.PI / fs);
            floats[i + nSampels / 2] = (float)Math.Sin(i * freq * 2 * 2 * Math.PI / fs);
        }
        var ok = await js.InvokeAsync<bool>("playNoise", floats, nChannels);
    }
}

The button plays a 440 Hz tone in the left channel (chanel 1) and a 880 Hz tone in the right channel (channel 2).

EDIT: Samplerate does not have to be the same as in the AudioContext. Check here for specs.