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/*
* 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
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* 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
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#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, EnableWeakPtrThreadingAssertions::No) // WebAudio code uses locking when accessing the context.
{
}
AudioSummingJunction::~AudioSummingJunction()
{
if (m_renderingStateNeedUpdating && context())
context()->removeMarkedSummingJunction(this);
}
void AudioSummingJunction::markRenderingStateAsDirty()
{
ASSERT(context());
ASSERT(context()->isGraphOwner());
if (!m_renderingStateNeedUpdating && canUpdateState()) {
context()->markSummingJunctionDirty(this);
m_renderingStateNeedUpdating = true;
}
}
bool AudioSummingJunction::addOutput(AudioNodeOutput& output)
{
ASSERT(context());
ASSERT(context()->isGraphOwner());
if (!m_outputs.add(&output).isNewEntry)
return false;
if (m_pendingRenderingOutputs.isEmpty())
m_pendingRenderingOutputs = copyToVector(m_outputs);
else
m_pendingRenderingOutputs.append(&output);
markRenderingStateAsDirty();
return true;
}
bool AudioSummingJunction::removeOutput(AudioNodeOutput& output)
{
ASSERT(context());
ASSERT(context()->isGraphOwner());
// Heap allocations are forbidden on the audio thread for performance reasons so we need to
// explicitly allow the following allocation(s).
DisableMallocRestrictionsForCurrentThreadScope disableMallocRestrictions;
if (!m_outputs.remove(&output))
return false;
if (m_pendingRenderingOutputs.isEmpty()) {
m_pendingRenderingOutputs = copyToVector(m_outputs);
} else
m_pendingRenderingOutputs.removeFirst(&output);
markRenderingStateAsDirty();
return true;
}
void AudioSummingJunction::updateRenderingState()
{
ASSERT(context());
ASSERT(context()->isAudioThread() && context()->isGraphOwner());
if (m_renderingStateNeedUpdating && canUpdateState()) {
// Copy from m_outputs to m_renderingOutputs.
m_renderingOutputs = std::exchange(m_pendingRenderingOutputs, { });
for (auto& output : m_renderingOutputs)
output->updateRenderingState();
didUpdate();
m_renderingStateNeedUpdating = false;
}
}
unsigned AudioSummingJunction::maximumNumberOfChannels() const
{
unsigned maxChannels = 0;
for (auto* output : m_outputs) {
// Use output()->numberOfChannels() instead of output->bus()->numberOfChannels(),
// because the calling of AudioNodeOutput::bus() is not safe here.
maxChannels = std::max(maxChannels, output->numberOfChannels());
}
return maxChannels;
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
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