/*
* 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
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* 2. Redistributions in binary form must reproduce the above copyright
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* 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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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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#include "config.h"
#if ENABLE(WEB_AUDIO)
#include "AudioNodeInput.h"
#include "AudioContext.h"
#include "AudioNode.h"
#include "AudioNodeOutput.h"
#include <algorithm>
using namespace std;
namespace WebCore {
AudioNodeInput::AudioNodeInput(AudioNode* node)
: m_node(node)
, m_renderingStateNeedUpdating(false)
{
m_monoSummingBus = adoptPtr(new AudioBus(1, AudioNode::ProcessingSizeInFrames));
m_stereoSummingBus = adoptPtr(new AudioBus(2, 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.contains(output))
return;
output->addInput(this);
m_outputs.add(output);
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.contains(output)) {
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.contains(output)) {
m_disabledOutputs.remove(output);
output->removeInput(this);
node()->deref(AudioNode::RefTypeDisabled); // 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();
node()->ref(AudioNode::RefTypeDisabled);
node()->deref(AudioNode::RefTypeConnection); // Note: it's important to return immediately after all deref() calls since the node may be deleted.
}
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();
node()->ref(AudioNode::RefTypeConnection);
node()->deref(AudioNode::RefTypeDisabled); // Note: it's important to return immediately after all deref() calls since the node may be deleted.
}
void AudioNodeInput::changedOutputs()
{
ASSERT(context()->isGraphOwner());
if (!m_renderingStateNeedUpdating && !node()->isMarkedForDeletion()) {
context()->markAudioNodeInputDirty(this);
m_renderingStateNeedUpdating = true;
}
}
void AudioNodeInput::updateRenderingState()
{
ASSERT(context()->isAudioThread() && context()->isGraphOwner());
if (m_renderingStateNeedUpdating && !node()->isMarkedForDeletion()) {
// 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();
}
node()->checkNumberOfChannelsForInput(this);
m_renderingStateNeedUpdating = false;
}
}
unsigned AudioNodeInput::numberOfChannels() const
{
// Find the number of channels of the connection with the largest number of channels.
unsigned maxChannels = 1; // one channel is the minimum allowed
for (HashSet<AudioNodeOutput*>::iterator i = m_outputs.begin(); i != m_outputs.end(); ++i) {
AudioNodeOutput* output = *i;
maxChannels = max(maxChannels, output->bus()->numberOfChannels());
}
return maxChannels;
}
unsigned AudioNodeInput::numberOfRenderingChannels()
{
ASSERT(context()->isAudioThread());
// Find the number of channels of the rendering connection with the largest number of channels.
unsigned maxChannels = 1; // one channel is the minimum allowed
for (unsigned i = 0; i < numberOfRenderingConnections(); ++i)
maxChannels = max(maxChannels, renderingOutput(i)->bus()->numberOfChannels());
return maxChannels;
}
AudioBus* AudioNodeInput::bus()
{
ASSERT(context()->isAudioThread());
// Handle single connection specially to allow for in-place processing.
if (numberOfRenderingConnections() == 1)
return renderingOutput(0)->bus();
// Multiple connections case (or no connections).
return internalSummingBus();
}
AudioBus* AudioNodeInput::internalSummingBus()
{
ASSERT(context()->isAudioThread());
// We must pick a summing bus which is the right size to handle the largest connection.
switch (numberOfRenderingChannels()) {
case 1:
return m_monoSummingBus.get();
case 2:
return m_stereoSummingBus.get();
// FIXME: could implement more than just mono and stereo mixing in the future
}
ASSERT_NOT_REACHED();
return 0;
}
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);
ASSERT(summingBus);
if (!summingBus)
return;
summingBus->zero();
for (unsigned i = 0; i < numberOfRenderingConnections(); ++i) {
AudioNodeOutput* output = renderingOutput(i);
ASSERT(output);
// Render audio from this output.
AudioBus* connectionBus = output->pull(0, framesToProcess);
// Sum, with unity-gain.
summingBus->sumFrom(*connectionBus);
}
}
AudioBus* AudioNodeInput::pull(AudioBus* inPlaceBus, size_t framesToProcess)
{
ASSERT(context()->isAudioThread());
// Handle single connection case.
if (numberOfRenderingConnections() == 1) {
// 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)