text: /*
   * Copyright (C) 2011, 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 "modules/webaudio/BiquadFilterNode.h"
  
  namespace blink {
  
  BiquadFilterNode::BiquadFilterNode(AudioContext* context, float sampleRate)
      : AudioBasicProcessorNode(NodeTypeBiquadFilter, context, sampleRate)
  {
      // Initially setup as lowpass filter.
      m_processor = new BiquadProcessor(context, sampleRate, 1, false);
  }
  
  String BiquadFilterNode::type() const
  {
      switch (const_cast<BiquadFilterNode*>(this)->biquadProcessor()->type()) {
      case BiquadProcessor::LowPass:
          return "lowpass";
      case BiquadProcessor::HighPass:
          return "highpass";
      case BiquadProcessor::BandPass:
          return "bandpass";
      case BiquadProcessor::LowShelf:
          return "lowshelf";
      case BiquadProcessor::HighShelf:
          return "highshelf";
      case BiquadProcessor::Peaking:
          return "peaking";
      case BiquadProcessor::Notch:
          return "notch";
      case BiquadProcessor::Allpass:
          return "allpass";
      default:
          ASSERT_NOT_REACHED();
          return "lowpass";
      }
  }
  
  void BiquadFilterNode::setType(const String& type)
  {
      if (type == "lowpass")
          setType(BiquadProcessor::LowPass);
      else if (type == "highpass")
          setType(BiquadProcessor::HighPass);
      else if (type == "bandpass")
          setType(BiquadProcessor::BandPass);
      else if (type == "lowshelf")
          setType(BiquadProcessor::LowShelf);
      else if (type == "highshelf")
          setType(BiquadProcessor::HighShelf);
      else if (type == "peaking")
          setType(BiquadProcessor::Peaking);
      else if (type == "notch")
          setType(BiquadProcessor::Notch);
      else if (type == "allpass")
          setType(BiquadProcessor::Allpass);
  }
  
  bool BiquadFilterNode::setType(unsigned type)
  {
      if (type > BiquadProcessor::Allpass)
          return false;
  
      biquadProcessor()->setType(static_cast<BiquadProcessor::FilterType>(type));
      return true;
  }
  
  void BiquadFilterNode::getFrequencyResponse(const DOMFloat32Array* frequencyHz, DOMFloat32Array* magResponse, DOMFloat32Array* phaseResponse)
  {
      if (!frequencyHz || !magResponse || !phaseResponse)
          return;
  
      int n = std::min(frequencyHz->length(),
                       std::min(magResponse->length(), phaseResponse->length()));
  
      if (n) {
          biquadProcessor()->getFrequencyResponse(n,
                                                  frequencyHz->data(),
                                                  magResponse->data(),
                                                  phaseResponse->data());
      }
  }
  
  } // namespace blink
  
  #endif // ENABLE(WEB_AUDIO)
  