Method pull

src/core/AudioNodeInput.cpp:139–183

}

AudioBus * AudioNodeInput::pull(ContextRenderLock & r, AudioBus * inPlaceBus, int bufferSize)
{
    updateRenderingState(r);
    m_destinationNode->checkNumberOfChannelsForInput(r, this);

    size_t num_connections = numberOfRenderingConnections(r);

    // Handle single connection case.
    if (num_connections == 1)
    {
        // If this input is simply passing data through, then immediately delegate the pull request to it.
        auto output = renderingOutput(r, 0);
        if (output)
        {
            return output->pull(r, inPlaceBus, bufferSize);
        }

        num_connections = 0;  // if there's a single input, but it has no output; treat this input as silent.
    }

    if (num_connections == 0)
    {
        // Generate silence if we're not connected to anything, and return the silent bus
        /// @TODO a possible optimization is to flag silence and propagate it to consumers of this input.
        m_internalSummingBus->zero();
        return m_internalSummingBus.get();
    }

    // multiple connections
    m_internalSummingBus->zero();

    for (int i = 0; i < num_connections; ++i)
    {
        auto output = renderingOutput(r, i);
        if (output)
        {
            // Render audio from this output.
            AudioBus * connectionBus = output->pull(r, 0, bufferSize);

            // Sum, with unity-gain.
            m_internalSummingBus->sumFrom(*connectionBus);
        }
    }
    return m_internalSummingBus.get();
}

}  // namespace lab