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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "config.h"
#if ENABLE(WEB_AUDIO)
#include "modules/webaudio/StereoPannerNode.h"
#include "bindings/core/v8/ExceptionMessages.h"
#include "bindings/core/v8/ExceptionState.h"
#include "core/dom/ExceptionCode.h"
#include "core/dom/ExecutionContext.h"
#include "modules/webaudio/AudioContext.h"
#include "modules/webaudio/AudioNodeInput.h"
#include "modules/webaudio/AudioNodeOutput.h"
#include "platform/audio/StereoPanner.h"
#include "wtf/MathExtras.h"
namespace blink {
StereoPannerNode::StereoPannerNode(AudioContext* context, float sampleRate)
: AudioNode(NodeTypeStereoPanner, context, sampleRate)
, m_sampleAccuratePanValues(AudioNode::ProcessingSizeInFrames)
{
m_pan = AudioParam::create(context, 0);
addInput();
addOutput(AudioNodeOutput::create(this, 2));
// The node-specific default mixing rules declare that StereoPannerNode
// can handle mono to stereo and stereo to stereo conversion.
m_channelCount = 2;
m_channelCountMode = ClampedMax;
m_channelInterpretation = AudioBus::Speakers;
initialize();
}
StereoPannerNode::~StereoPannerNode()
{
ASSERT(!isInitialized());
}
void StereoPannerNode::dispose()
{
uninitialize();
AudioNode::dispose();
}
void StereoPannerNode::process(size_t framesToProcess)
{
AudioBus* outputBus = output(0)->bus();
if (!isInitialized() || !input(0)->isConnected() || !m_stereoPanner.get()) {
outputBus->zero();
return;
}
AudioBus* inputBus = input(0)->bus();
if (!inputBus) {
outputBus->zero();
return;
}
if (pan()->hasSampleAccurateValues()) {
// Apply sample-accurate panning specified by AudioParam automation.
ASSERT(framesToProcess <= m_sampleAccuratePanValues.size());
if (framesToProcess <= m_sampleAccuratePanValues.size()) {
float* panValues = m_sampleAccuratePanValues.data();
pan()->calculateSampleAccurateValues(panValues, framesToProcess);
m_stereoPanner->panWithSampleAccurateValues(inputBus, outputBus, panValues, framesToProcess);
}
} else {
m_stereoPanner->panToTargetValue(inputBus, outputBus, pan()->value(), framesToProcess);
}
}
void StereoPannerNode::initialize()
{
if (isInitialized())
return;
m_stereoPanner = Spatializer::create(Spatializer::PanningModelEqualPower, sampleRate());
AudioNode::initialize();
}
void StereoPannerNode::uninitialize()
{
if (!isInitialized())
return;
m_stereoPanner.clear();
AudioNode::uninitialize();
}
void StereoPannerNode::setChannelCount(unsigned long channelCount, ExceptionState& exceptionState)
{
ASSERT(isMainThread());
AudioContext::AutoLocker locker(context());
// A PannerNode only supports 1 or 2 channels
if (channelCount > 0 && channelCount <= 2) {
if (m_channelCount != channelCount) {
m_channelCount = channelCount;
if (m_channelCountMode != Max)
updateChannelsForInputs();
}
} else {
exceptionState.throwDOMException(
NotSupportedError,
ExceptionMessages::indexOutsideRange<unsigned long>(
"channelCount",
channelCount,
1,
ExceptionMessages::InclusiveBound,
2,
ExceptionMessages::InclusiveBound));
}
}
void StereoPannerNode::setChannelCountMode(const String& mode, ExceptionState& exceptionState)
{
ASSERT(isMainThread());
AudioContext::AutoLocker locker(context());
ChannelCountMode oldMode = m_channelCountMode;
if (mode == "clamped-max") {
m_newChannelCountMode = ClampedMax;
} else if (mode == "explicit") {
m_newChannelCountMode = Explicit;
} else if (mode == "max") {
// This is not supported for a StereoPannerNode, which can only handle
// 1 or 2 channels.
exceptionState.throwDOMException(
NotSupportedError,
ExceptionMessages::failedToSet(
"channelCountMode",
"StereoPannerNode",
"'max' is not allowed"));
m_newChannelCountMode = oldMode;
} else {
// Do nothing for other invalid values.
m_newChannelCountMode = oldMode;
}
if (m_newChannelCountMode != oldMode)
context()->addChangedChannelCountMode(this);
}
void StereoPannerNode::trace(Visitor* visitor)
{
visitor->trace(m_stereoPanner);
visitor->trace(m_pan);
AudioNode::trace(visitor);
}
} // namespace blink
#endif // ENABLE(WEB_AUDIO)
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