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/*
* Copyright (C) 2012, Intel Corporation. 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 "modules/webaudio/AudioBasicInspectorNode.h"
#if ENABLE(WEB_AUDIO)
#include "modules/webaudio/AbstractAudioContext.h"
#include "modules/webaudio/AudioNodeInput.h"
#include "modules/webaudio/AudioNodeOutput.h"
namespace blink {
AudioBasicInspectorHandler::AudioBasicInspectorHandler(NodeType nodeType, AudioNode& node, float sampleRate, unsigned outputChannelCount)
: AudioHandler(nodeType, node, sampleRate)
, m_needAutomaticPull(false)
{
addInput();
addOutput(outputChannelCount);
}
// We override pullInputs() as an optimization allowing this node to take advantage of in-place processing,
// where the input is simply passed through unprocessed to the output.
// Note: this only applies if the input and output channel counts match.
void AudioBasicInspectorHandler::pullInputs(size_t framesToProcess)
{
// Render input stream - try to render directly into output bus for pass-through processing where process() doesn't need to do anything...
input(0).pull(output(0).bus(), framesToProcess);
}
AudioNode* AudioBasicInspectorNode::connect(AudioNode* destination, unsigned outputIndex, unsigned inputIndex, ExceptionState& exceptionState)
{
ASSERT(isMainThread());
AbstractAudioContext::AutoLocker locker(context());
AudioNode::connect(destination, outputIndex, inputIndex, exceptionState);
static_cast<AudioBasicInspectorHandler&>(handler()).updatePullStatus();
return destination;
}
void AudioBasicInspectorNode::disconnect(unsigned outputIndex, ExceptionState& exceptionState)
{
ASSERT(isMainThread());
AbstractAudioContext::AutoLocker locker(context());
AudioNode::disconnect(outputIndex, exceptionState);
static_cast<AudioBasicInspectorHandler&>(handler()).updatePullStatus();
}
void AudioBasicInspectorHandler::checkNumberOfChannelsForInput(AudioNodeInput* input)
{
ASSERT(context()->isAudioThread());
ASSERT(context()->isGraphOwner());
ASSERT(input == &this->input(0));
if (input != &this->input(0))
return;
unsigned numberOfChannels = input->numberOfChannels();
if (numberOfChannels != output(0).numberOfChannels()) {
// This will propagate the channel count to any nodes connected further downstream in the graph.
output(0).setNumberOfChannels(numberOfChannels);
}
AudioHandler::checkNumberOfChannelsForInput(input);
updatePullStatus();
}
void AudioBasicInspectorHandler::updatePullStatus()
{
ASSERT(context()->isGraphOwner());
if (output(0).isConnected()) {
// When an AudioBasicInspectorNode is connected to a downstream node, it will get pulled by the
// downstream node, thus remove it from the context's automatic pull list.
if (m_needAutomaticPull) {
context()->deferredTaskHandler().removeAutomaticPullNode(this);
m_needAutomaticPull = false;
}
} else {
unsigned numberOfInputConnections = input(0).numberOfRenderingConnections();
if (numberOfInputConnections && !m_needAutomaticPull) {
// When an AudioBasicInspectorNode is not connected to any downstream node while still connected from
// upstream node(s), add it to the context's automatic pull list.
context()->deferredTaskHandler().addAutomaticPullNode(this);
m_needAutomaticPull = true;
} else if (!numberOfInputConnections && m_needAutomaticPull) {
// The AudioBasicInspectorNode is connected to nothing, remove it from the context's automatic pull list.
context()->deferredTaskHandler().removeAutomaticPullNode(this);
m_needAutomaticPull = false;
}
}
}
} // namespace blink
#endif // ENABLE(WEB_AUDIO)
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