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      1 /*
      2  * Copyright (C) 2012, Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1.  Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2.  Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23  */
     24 
     25 #include "config.h"
     26 
     27 #if ENABLE(WEB_AUDIO)
     28 
     29 #include "modules/webaudio/AudioSummingJunction.h"
     30 
     31 #include "modules/webaudio/AudioContext.h"
     32 #include "modules/webaudio/AudioNodeOutput.h"
     33 #include <algorithm>
     34 
     35 using namespace std;
     36 
     37 namespace WebCore {
     38 
     39 AudioSummingJunction::AudioSummingJunction(AudioContext* context)
     40     : m_context(context)
     41     , m_renderingStateNeedUpdating(false)
     42 {
     43 }
     44 
     45 AudioSummingJunction::~AudioSummingJunction()
     46 {
     47     if (m_renderingStateNeedUpdating && m_context.get())
     48         m_context->removeMarkedSummingJunction(this);
     49 }
     50 
     51 void AudioSummingJunction::changedOutputs()
     52 {
     53     ASSERT(context()->isGraphOwner());
     54     if (!m_renderingStateNeedUpdating && canUpdateState()) {
     55         context()->markSummingJunctionDirty(this);
     56         m_renderingStateNeedUpdating = true;
     57     }
     58 }
     59 
     60 void AudioSummingJunction::updateRenderingState()
     61 {
     62     ASSERT(context()->isAudioThread() && context()->isGraphOwner());
     63 
     64     if (m_renderingStateNeedUpdating && canUpdateState()) {
     65         // Copy from m_outputs to m_renderingOutputs.
     66         m_renderingOutputs.resize(m_outputs.size());
     67         unsigned j = 0;
     68         for (HashSet<AudioNodeOutput*>::iterator i = m_outputs.begin(); i != m_outputs.end(); ++i, ++j) {
     69             AudioNodeOutput* output = *i;
     70             m_renderingOutputs[j] = output;
     71             output->updateRenderingState();
     72         }
     73 
     74         didUpdate();
     75 
     76         m_renderingStateNeedUpdating = false;
     77     }
     78 }
     79 
     80 } // namespace WebCore
     81 
     82 #endif // ENABLE(WEB_AUDIO)
     83