Method process

src/extended/NoiseNode.cpp:54–123

}

void NoiseNode::process(ContextRenderLock &r, int bufferSize)
{
    AudioBus * outputBus = output(0)->bus(r);

    if (!isInitialized() || !outputBus->numberOfChannels())
    {
        outputBus->zero();
        return;
    }

    int quantumFrameOffset = _scheduler._renderOffset;
    int nonSilentFramesToProcess = _scheduler._renderLength;

    if (!nonSilentFramesToProcess)
    {
        outputBus->zero();
        return;
    }

    float * destP = outputBus->channel(0)->mutableData();

    // Start rendering at the correct offset.
    destP += quantumFrameOffset;
    int n = nonSilentFramesToProcess;

    switch (NoiseType(_type->valueUint32()))
    {
            // reference: http://noisehack.com/generate-noise-web-audio-api/
        case WHITE:
            while (n--)
            {
                float white = ((float) ((whiteSeed & 0x7fffffff) - 0x40000000)) * (float) (1.0f / 0x40000000);
                white = (white * 0.5f) - 1.0f;
                *destP++ = white;
                whiteSeed = whiteSeed * 435898247 + 382842987;
            }
            break;
        case PINK:
            while (n--)
            {
                float white = ((float) ((whiteSeed & 0x7fffffff) - 0x40000000)) * (float) (1.0f / 0x40000000);
                white = (white * 0.5f) - 1.0f;
                whiteSeed = whiteSeed * 435898247 + 382842987;

                pink0 = 0.99886f * pink0 + white * 0.0555179f;
                pink1 = 0.99332f * pink1 + white * 0.0750759f;
                pink2 = 0.96900f * pink2 + white * 0.1538520f;
                pink3 = 0.86650f * pink3 + white * 0.3104856f;
                pink4 = 0.55000f * pink4 + white * 0.5329522f;
                pink5 = -0.7616f * pink5 - white * 0.0168980f;
                *destP++ = (pink0 + pink1 + pink2 + pink3 + pink4 + pink5 + pink6 + (white * 0.5362f)) * 0.11f;  // .11 roughly compensates gain
                pink6 = white * 0.115926f;
            }
            break;
        case BROWN:
            while (n--)
            {
                float white = ((float) ((whiteSeed & 0x7fffffff) - 0x40000000)) * (float) (1.0f / 0x40000000);