AudioNodeInput.cpp [plain text]
#include "config.h"
#if ENABLE(WEB_AUDIO)
#include "AudioNodeInput.h"
#include "AudioContext.h"
#include "AudioNode.h"
#include "AudioNodeOutput.h"
#include "AudioUtilities.h"
#include "ChannelCountMode.h"
#include <algorithm>
namespace WebCore {
AudioNodeInput::AudioNodeInput(AudioNode* node)
: AudioSummingJunction(node->context())
, m_node(node)
{
m_internalSummingBus = AudioBus::create(1, AudioUtilities::renderQuantumSize);
}
void AudioNodeInput::connect(AudioNodeOutput* output)
{
ASSERT(context().isGraphOwner());
ASSERT(output && node());
if (!output || !node())
return;
auto addPotentiallyDisabledOutput = [this](AudioNodeOutput& output) {
if (output.isEnabled())
return addOutput(output);
return m_disabledOutputs.add(&output).isNewEntry;
};
if (addPotentiallyDisabledOutput(*output))
output->addInput(this);
}
void AudioNodeInput::disconnect(AudioNodeOutput* output)
{
ASSERT(context().isGraphOwner());
ASSERT(output && node());
if (!output || !node())
return;
if (removeOutput(*output)) {
output->removeInput(this); return;
}
if (m_disabledOutputs.remove(output)) {
output->removeInput(this); return;
}
ASSERT_NOT_REACHED();
}
void AudioNodeInput::disable(AudioNodeOutput* output)
{
ASSERT(context().isGraphOwner());
ASSERT(output && node());
if (!output || !node())
return;
m_disabledOutputs.add(output);
bool wasRemoved = removeOutput(*output);
ASSERT_UNUSED(wasRemoved, wasRemoved);
node()->disableOutputsIfNecessary();
}
void AudioNodeInput::enable(AudioNodeOutput* output)
{
ASSERT(context().isGraphOwner());
ASSERT(output && node());
if (!output || !node())
return;
ASSERT(m_disabledOutputs.contains(output));
addOutput(*output);
m_disabledOutputs.remove(output);
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, AudioUtilities::renderQuantumSize);
}
unsigned AudioNodeInput::numberOfChannels() const
{
auto mode = node()->channelCountMode();
if (mode == ChannelCountMode::Explicit)
return node()->channelCount();
unsigned maxChannels = std::max(maximumNumberOfChannels(), 1u);
if (mode == ChannelCountMode::ClampedMax)
maxChannels = std::min(maxChannels, static_cast<unsigned>(node()->channelCount()));
return maxChannels;
}
AudioBus* AudioNodeInput::bus()
{
ASSERT(context().isAudioThread());
if (numberOfRenderingConnections() == 1 && node()->channelCountMode() == ChannelCountMode::Max)
return renderingOutput(0)->bus();
return internalSummingBus();
}
AudioBus* AudioNodeInput::internalSummingBus()
{
ASSERT(context().isAudioThread());
return m_internalSummingBus.get();
}
void AudioNodeInput::sumAllConnections(AudioBus* summingBus, size_t framesToProcess)
{
ASSERT(context().isAudioThread());
ASSERT(numberOfRenderingConnections() > 1 || node()->channelCountMode() != ChannelCountMode::Max);
ASSERT(summingBus);
if (!summingBus)
return;
summingBus->zero();
auto interpretation = node()->channelInterpretation();
for (auto& output : m_renderingOutputs) {
ASSERT(output);
AudioBus* connectionBus = output->pull(0, framesToProcess);
summingBus->sumFrom(*connectionBus, interpretation);
}
}
AudioBus* AudioNodeInput::pull(AudioBus* inPlaceBus, size_t framesToProcess)
{
ASSERT(context().isAudioThread());
if (numberOfRenderingConnections() == 1 && node()->channelCountMode() == ChannelCountMode::Max) {
AudioNodeOutput* output = this->renderingOutput(0);
return output->pull(inPlaceBus, framesToProcess);
}
AudioBus* internalSummingBus = this->internalSummingBus();
if (!numberOfRenderingConnections()) {
internalSummingBus->zero();
return internalSummingBus;
}
sumAllConnections(internalSummingBus, framesToProcess);
return internalSummingBus;
}
}
#endif // ENABLE(WEB_AUDIO)