third_party/WebKit/Source/modules/webaudio/WaveShaperNode.cpp

/*
 * Copyright (C) 2011, Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
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#include "bindings/core/v8/ExceptionMessages.h"
#include "bindings/core/v8/ExceptionState.h"
#include "core/dom/ExceptionCode.h"
#include "modules/webaudio/AudioBasicProcessorHandler.h"
#include "modules/webaudio/BaseAudioContext.h"
#include "modules/webaudio/WaveShaperNode.h"
#include "modules/webaudio/WaveShaperOptions.h"
#include "wtf/PtrUtil.h"

namespace blink {

WaveShaperNode::WaveShaperNode(BaseAudioContext& context) : AudioNode(context) {
  setHandler(AudioBasicProcessorHandler::create(
      AudioHandler::NodeTypeWaveShaper, *this, context.sampleRate(),
      wrapUnique(new WaveShaperProcessor(context.sampleRate(), 1))));

  handler().initialize();
}

WaveShaperNode* WaveShaperNode::create(BaseAudioContext& context,
                                       ExceptionState& exceptionState) {
  DCHECK(isMainThread());

  if (context.isContextClosed()) {
    context.throwExceptionForClosedState(exceptionState);
    return nullptr;
  }

  return new WaveShaperNode(context);
}

WaveShaperNode* WaveShaperNode::create(BaseAudioContext* context,
                                       const WaveShaperOptions& options,
                                       ExceptionState& exceptionState) {
  WaveShaperNode* node = create(*context, exceptionState);

  if (!node)
    return nullptr;

  node->handleChannelOptions(options, exceptionState);

  if (options.hasCurve())
    node->setCurve(options.curve(), exceptionState);
  if (options.hasOversample())
    node->setOversample(options.oversample());

  return node;
}
WaveShaperProcessor* WaveShaperNode::getWaveShaperProcessor() const {
  return static_cast<WaveShaperProcessor*>(
      static_cast<AudioBasicProcessorHandler&>(handler()).processor());
}

void WaveShaperNode::setCurveImpl(const float* curveData,
                                  unsigned curveLength,
                                  ExceptionState& exceptionState) {
  DCHECK(isMainThread());

  if (curveData && curveLength < 2) {
    exceptionState.throwDOMException(
        InvalidAccessError,
        ExceptionMessages::indexExceedsMinimumBound<unsigned>("curve length",
                                                              curveLength, 2));
    return;
  }

  getWaveShaperProcessor()->setCurve(curveData, curveLength);
}

void WaveShaperNode::setCurve(DOMFloat32Array* curve,
                              ExceptionState& exceptionState) {
  DCHECK(isMainThread());

  if (curve)
    setCurveImpl(curve->data(), curve->length(), exceptionState);
  else
    setCurveImpl(nullptr, 0, exceptionState);
}

void WaveShaperNode::setCurve(const Vector<float>& curve,
                              ExceptionState& exceptionState) {
  DCHECK(isMainThread());

  setCurveImpl(curve.data(), curve.size(), exceptionState);
}

DOMFloat32Array* WaveShaperNode::curve() {
  Vector<float>* curve = getWaveShaperProcessor()->curve();
  if (!curve)
    return nullptr;

  unsigned size = curve->size();
  RefPtr<WTF::Float32Array> newCurve = WTF::Float32Array::create(size);

  memcpy(newCurve->data(), curve->data(), sizeof(float) * size);

  return DOMFloat32Array::create(newCurve.release());
}

void WaveShaperNode::setOversample(const String& type) {
  DCHECK(isMainThread());

  // This is to synchronize with the changes made in
  // AudioBasicProcessorNode::checkNumberOfChannelsForInput() where we can
  // initialize() and uninitialize().
  BaseAudioContext::AutoLocker contextLocker(context());

  if (type == "none") {
    getWaveShaperProcessor()->setOversample(
        WaveShaperProcessor::OverSampleNone);
  } else if (type == "2x") {
    getWaveShaperProcessor()->setOversample(WaveShaperProcessor::OverSample2x);
  } else if (type == "4x") {
    getWaveShaperProcessor()->setOversample(WaveShaperProcessor::OverSample4x);
  } else {
    ASSERT_NOT_REACHED();
  }
}

String WaveShaperNode::oversample() const {
  switch (const_cast<WaveShaperNode*>(this)
              ->getWaveShaperProcessor()
              ->oversample()) {
    case WaveShaperProcessor::OverSampleNone:
      return "none";
    case WaveShaperProcessor::OverSample2x:
      return "2x";
    case WaveShaperProcessor::OverSample4x:
      return "4x";
    default:
      ASSERT_NOT_REACHED();
      return "none";
  }
}

}  // namespace blink