/*
 * 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.
 */

#ifndef ConvolverNode_h
#define ConvolverNode_h

#include "base/gtest_prod_util.h"
#include "modules/ModulesExport.h"
#include "modules/webaudio/AudioNode.h"
#include "wtf/RefPtr.h"
#include "wtf/ThreadingPrimitives.h"
#include <memory>

namespace blink {

class AudioBuffer;
class ConvolverOptions;
class ExceptionState;
class Reverb;

class MODULES_EXPORT ConvolverHandler final : public AudioHandler {
 public:
  static PassRefPtr<ConvolverHandler> create(AudioNode&, float sampleRate);
  ~ConvolverHandler() override;

  // AudioHandler
  void process(size_t framesToProcess) override;

  // Impulse responses
  void setBuffer(AudioBuffer*, ExceptionState&);
  AudioBuffer* buffer();

  bool normalize() const { return m_normalize; }
  void setNormalize(bool normalize) { m_normalize = normalize; }

 private:
  ConvolverHandler(AudioNode&, float sampleRate);
  double tailTime() const override;
  double latencyTime() const override;

  std::unique_ptr<Reverb> m_reverb;
  // This Persistent doesn't make a reference cycle including the owner
  // ConvolverNode.
  Persistent<AudioBuffer> m_buffer;

  // This synchronizes dynamic changes to the convolution impulse response with
  // process().
  mutable Mutex m_processLock;

  // Normalize the impulse response or not. Must default to true.
  bool m_normalize;

  FRIEND_TEST_ALL_PREFIXES(ConvolverNodeTest, ReverbLifetime);
};

class MODULES_EXPORT ConvolverNode final : public AudioNode {
  DEFINE_WRAPPERTYPEINFO();

 public:
  static ConvolverNode* create(BaseAudioContext&, ExceptionState&);
  static ConvolverNode* create(BaseAudioContext*,
                               const ConvolverOptions&,
                               ExceptionState&);

  AudioBuffer* buffer() const;
  void setBuffer(AudioBuffer*, ExceptionState&);
  bool normalize() const;
  void setNormalize(bool);

 private:
  ConvolverNode(BaseAudioContext&);
  ConvolverHandler& convolverHandler() const;

  FRIEND_TEST_ALL_PREFIXES(ConvolverNodeTest, ReverbLifetime);
};

}  // namespace blink

#endif  // ConvolverNode_h
