Source/WebCore/Modules/webaudio/AudioSummingJunction.cpp

/*
 * Copyright (C) 2012, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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#include "config.h"

#if ENABLE(WEB_AUDIO)

#include "AudioSummingJunction.h"

#include "AudioContext.h"
#include "AudioNodeOutput.h"
#include <algorithm>

namespace WebCore {

AudioSummingJunction::AudioSummingJunction(BaseAudioContext& context)
    : m_context(context)
    , m_renderingStateNeedUpdating(false)
{
}

AudioSummingJunction::~AudioSummingJunction()
{
    if (m_renderingStateNeedUpdating)
        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 i = 0;
        for (auto& output : m_outputs) {
            m_renderingOutputs[i++] = output;
            output->updateRenderingState();
        }

        didUpdate();

        m_renderingStateNeedUpdating = false;
    }
}

} // namespace WebCore

#endif // ENABLE(WEB_AUDIO)