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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
* (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 "AudioNodeOutput.h"
#include "AudioBus.h"
#include "AudioContext.h"
#include "AudioNodeInput.h"
#include <wtf/Threading.h>
namespace WebCore {
AudioNodeOutput::AudioNodeOutput(AudioNode* node, unsigned numberOfChannels)
: m_node(node)
, m_numberOfChannels(numberOfChannels)
, m_desiredNumberOfChannels(numberOfChannels)
, m_internalOutputBus(0)
, m_actualDestinationBus(0)
, m_isEnabled(true)
, m_renderingFanOutCount(0)
{
m_monoInternalBus = adoptPtr(new AudioBus(1, AudioNode::ProcessingSizeInFrames));
m_stereoInternalBus = adoptPtr(new AudioBus(2, AudioNode::ProcessingSizeInFrames));
setInternalBus();
}
void AudioNodeOutput::setNumberOfChannels(unsigned numberOfChannels)
{
ASSERT(context()->isGraphOwner());
m_desiredNumberOfChannels = numberOfChannels;
if (context()->isAudioThread()) {
// If we're in the audio thread then we can take care of it right away (we should be at the very start or end of a rendering quantum).
updateNumberOfChannels();
} else {
// Let the context take care of it in the audio thread in the pre and post render tasks.
context()->markAudioNodeOutputDirty(this);
}
}
void AudioNodeOutput::setInternalBus()
{
switch (m_numberOfChannels) {
case 0:
case 1:
m_internalOutputBus = m_monoInternalBus.get();
break;
case 2:
m_internalOutputBus = m_stereoInternalBus.get();
break;
default:
// FIXME: later we can fully implement more than stereo, 5.1, etc.
ASSERT_NOT_REACHED();
}
// This may later be changed in pull() to point to an in-place bus with the same number of channels.
m_actualDestinationBus = m_internalOutputBus;
}
void AudioNodeOutput::updateRenderingState()
{
updateNumberOfChannels();
m_renderingFanOutCount = fanOutCount();
}
void AudioNodeOutput::updateNumberOfChannels()
{
ASSERT(context()->isAudioThread() && context()->isGraphOwner());
if (m_numberOfChannels != m_desiredNumberOfChannels) {
m_numberOfChannels = m_desiredNumberOfChannels;
setInternalBus();
propagateChannelCount();
}
}
void AudioNodeOutput::propagateChannelCount()
{
ASSERT(context()->isAudioThread() && context()->isGraphOwner());
if (isChannelCountKnown()) {
// Announce to any nodes we're connected to that we changed our channel count for its input.
for (InputsIterator i = m_inputs.begin(); i != m_inputs.end(); ++i) {
AudioNodeInput* input = *i;
AudioNode* connectionNode = input->node();
connectionNode->checkNumberOfChannelsForInput(input);
}
}
}
AudioBus* AudioNodeOutput::pull(AudioBus* inPlaceBus, size_t framesToProcess)
{
ASSERT(context()->isAudioThread());
ASSERT(m_renderingFanOutCount > 0);
// Causes our AudioNode to process if it hasn't already for this render quantum.
// We try to do in-place processing (using inPlaceBus) if at all possible,
// but we can't process in-place if we're connected to more than one input (fan-out > 1).
// In this case pull() is called multiple times per rendering quantum, and the processIfNecessary() call below will
// cause our node to process() only the first time, caching the output in m_internalOutputBus for subsequent calls.
bool isInPlace = inPlaceBus && inPlaceBus->numberOfChannels() == numberOfChannels() && m_renderingFanOutCount == 1;
// Setup the actual destination bus for processing when our node's process() method gets called in processIfNecessary() below.
m_actualDestinationBus = isInPlace ? inPlaceBus : m_internalOutputBus;
node()->processIfNecessary(framesToProcess);
return m_actualDestinationBus;
}
AudioBus* AudioNodeOutput::bus() const
{
ASSERT(const_cast<AudioNodeOutput*>(this)->context()->isAudioThread());
ASSERT(m_actualDestinationBus);
return m_actualDestinationBus;
}
unsigned AudioNodeOutput::renderingFanOutCount() const
{
return m_renderingFanOutCount;
}
unsigned AudioNodeOutput::fanOutCount()
{
ASSERT(context()->isGraphOwner());
return m_inputs.size();
}
void AudioNodeOutput::addInput(AudioNodeInput* input)
{
ASSERT(context()->isGraphOwner());
ASSERT(input);
if (!input)
return;
m_inputs.add(input);
}
void AudioNodeOutput::removeInput(AudioNodeInput* input)
{
ASSERT(context()->isGraphOwner());
ASSERT(input);
if (!input)
return;
m_inputs.remove(input);
}
void AudioNodeOutput::disconnectAllInputs()
{
ASSERT(context()->isGraphOwner());
// AudioNodeInput::disconnect() changes m_inputs by calling removeInput().
while (!m_inputs.isEmpty()) {
AudioNodeInput* input = *m_inputs.begin();
input->disconnect(this);
}
}
void AudioNodeOutput::disable()
{
ASSERT(context()->isGraphOwner());
if (m_isEnabled) {
for (InputsIterator i = m_inputs.begin(); i != m_inputs.end(); ++i) {
AudioNodeInput* input = *i;
input->disable(this);
}
m_isEnabled = false;
}
}
void AudioNodeOutput::enable()
{
ASSERT(context()->isGraphOwner());
if (!m_isEnabled) {
for (InputsIterator i = m_inputs.begin(); i != m_inputs.end(); ++i) {
AudioNodeInput* input = *i;
input->enable(this);
}
m_isEnabled = true;
}
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
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