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/*
* Copyright (C) 2010, 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
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(WEB_AUDIO)
#include "AudioNodeInput.h"
#include "AudioContext.h"
#include "AudioNode.h"
#include "AudioNodeOutput.h"
#include <algorithm>
namespace WebCore {
AudioNodeInput::AudioNodeInput(AudioNode* node)
: AudioSummingJunction(node->context())
, m_node(node)
{
// Set to mono by default.
m_internalSummingBus = AudioBus::create(1, AudioNode::ProcessingSizeInFrames);
}
void AudioNodeInput::connect(AudioNodeOutput* output)
{
ASSERT(context().isGraphOwner());
ASSERT(output && node());
if (!output || !node())
return;
// Check if we're already connected to this output.
if (!m_outputs.add(output).isNewEntry)
return;
output->addInput(this);
changedOutputs();
// Sombody has just connected to us, so count it as a reference.
node()->ref(AudioNode::RefTypeConnection);
}
void AudioNodeInput::disconnect(AudioNodeOutput* output)
{
ASSERT(context().isGraphOwner());
ASSERT(output && node());
if (!output || !node())
return;
// First try to disconnect from "active" connections.
if (m_outputs.remove(output)) {
changedOutputs();
output->removeInput(this);
node()->deref(AudioNode::RefTypeConnection); // Note: it's important to return immediately after all deref() calls since the node may be deleted.
return;
}
// Otherwise, try to disconnect from disabled connections.
if (m_disabledOutputs.remove(output)) {
output->removeInput(this);
node()->deref(AudioNode::RefTypeConnection); // Note: it's important to return immediately after all deref() calls since the node may be deleted.
return;
}
ASSERT_NOT_REACHED();
}
void AudioNodeInput::disable(AudioNodeOutput* output)
{
ASSERT(context().isGraphOwner());
ASSERT(output && node());
if (!output || !node())
return;
ASSERT(m_outputs.contains(output));
m_disabledOutputs.add(output);
m_outputs.remove(output);
changedOutputs();
// Propagate disabled state to outputs.
node()->disableOutputsIfNecessary();
}
void AudioNodeInput::enable(AudioNodeOutput* output)
{
ASSERT(context().isGraphOwner());
ASSERT(output && node());
if (!output || !node())
return;
ASSERT(m_disabledOutputs.contains(output));
// Move output from disabled list to active list.
m_outputs.add(output);
m_disabledOutputs.remove(output);
changedOutputs();
// Propagate enabled state to outputs.
node()->enableOutputsIfNecessary();
}
void AudioNodeInput::didUpdate()
{
node()->checkNumberOfChannelsForInput(this);
}
void AudioNodeInput::updateInternalBus()
{
ASSERT(context().isAudioThread() && context().isGraphOwner());
unsigned numberOfInputChannels = numberOfChannels();
if (numberOfInputChannels == m_internalSummingBus->numberOfChannels())
return;
m_internalSummingBus = AudioBus::create(numberOfInputChannels, AudioNode::ProcessingSizeInFrames);
}
unsigned AudioNodeInput::numberOfChannels() const
{
AudioNode::ChannelCountMode mode = node()->internalChannelCountMode();
if (mode == AudioNode::Explicit)
return node()->channelCount();
// Find the number of channels of the connection with the largest number of channels.
unsigned maxChannels = 1; // one channel is the minimum allowed
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());
}
if (mode == AudioNode::ClampedMax)
maxChannels = std::min(maxChannels, static_cast<unsigned>(node()->channelCount()));
return maxChannels;
}
AudioBus* AudioNodeInput::bus()
{
ASSERT(context().isAudioThread());
// Handle single connection specially to allow for in-place processing.
if (numberOfRenderingConnections() == 1 && node()->internalChannelCountMode() == AudioNode::Max)
return renderingOutput(0)->bus();
// Multiple connections case or complex ChannelCountMode (or no connections).
return internalSummingBus();
}
AudioBus* AudioNodeInput::internalSummingBus()
{
ASSERT(context().isAudioThread());
return m_internalSummingBus.get();
}
void AudioNodeInput::sumAllConnections(AudioBus* summingBus, size_t framesToProcess)
{
ASSERT(context().isAudioThread());
// We shouldn't be calling this method if there's only one connection, since it's less efficient.
ASSERT(numberOfRenderingConnections() > 1 || node()->internalChannelCountMode() != AudioNode::Max);
ASSERT(summingBus);
if (!summingBus)
return;
summingBus->zero();
AudioBus::ChannelInterpretation interpretation = node()->internalChannelInterpretation();
for (auto& output : m_renderingOutputs) {
ASSERT(output);
// Render audio from this output.
AudioBus* connectionBus = output->pull(0, framesToProcess);
// Sum, with unity-gain.
summingBus->sumFrom(*connectionBus, interpretation);
}
}
AudioBus* AudioNodeInput::pull(AudioBus* inPlaceBus, size_t framesToProcess)
{
ASSERT(context().isAudioThread());
// Handle single connection case.
if (numberOfRenderingConnections() == 1 && node()->internalChannelCountMode() == AudioNode::Max) {
// The output will optimize processing using inPlaceBus if it's able.
AudioNodeOutput* output = this->renderingOutput(0);
return output->pull(inPlaceBus, framesToProcess);
}
AudioBus* internalSummingBus = this->internalSummingBus();
if (!numberOfRenderingConnections()) {
// At least, generate silence if we're not connected to anything.
// FIXME: if we wanted to get fancy, we could propagate a 'silent hint' here to optimize the downstream graph processing.
internalSummingBus->zero();
return internalSummingBus;
}
// Handle multiple connections case.
sumAllConnections(internalSummingBus, framesToProcess);
return internalSummingBus;
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)