root/AudioSummingJunction.cpp

/*
 * Copyright (C) 2012, Google Inc. All rights reserved.
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#include "config.h"

#if ENABLE(WEB_AUDIO)

#include "modules/webaudio/AudioSummingJunction.h"

#include "modules/webaudio/AudioContext.h"
#include "modules/webaudio/AudioNodeOutput.h"
#include <algorithm>

using namespace std;

namespace WebCore {

AudioSummingJunction::AudioSummingJunction(AudioContext* context)
    : m_context(context)
    , m_renderingStateNeedUpdating(false)
{
}

AudioSummingJunction::~AudioSummingJunction()
{
    if (m_renderingStateNeedUpdating && m_context.get())
        m_context->removeMarkedSummingJunction(this);
}

void AudioSummingJunction::changedOutputs()
{
    ASSERT(context()->isGraphOwner());
    if (!m_renderingStateNeedUpdating && canUpdateState()) {
        context()->markSummingJunctionDirty(this);
        m_renderingStateNeedUpdating = true;
    }
}

void AudioSummingJunction::updateRenderingState()
{
    ASSERT(context()->isAudioThread() && context()->isGraphOwner());

    if (m_renderingStateNeedUpdating && canUpdateState()) {
        // Copy from m_outputs to m_renderingOutputs.
        m_renderingOutputs.resize(m_outputs.size());
        unsigned j = 0;
        for (HashSet<AudioNodeOutput*>::iterator i = m_outputs.begin(); i != m_outputs.end(); ++i, ++j) {
            AudioNodeOutput* output = *i;
            m_renderingOutputs[j] = output;
            output->updateRenderingState();
        }

        didUpdate();

        m_renderingStateNeedUpdating = false;
    }
}

} // namespace WebCore

#endif // ENABLE(WEB_AUDIO)