text: /*******************************************************************************
   * Copyright 2009-2016 Jörg Müller
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   ******************************************************************************/
  
  #pragma once
  
  /**
   * @file ModulatorReader.h
   * @ingroup fx
   * The ModulatorReader class.
   */
  
  #include "IReader.h"
  #include "util/Buffer.h"
  
  #include <memory>
  
  AUD_NAMESPACE_BEGIN
  
  /**
   * This reader plays two readers with the same specs in parallel multiplying their samples.
   */
  class AUD_API ModulatorReader : public IReader
  {
  private:
  	/**
  	 * The first reader.
  	 */
  	std::shared_ptr<IReader> m_reader1;
  
  	/**
  	 * The second reader.
  	 */
  	std::shared_ptr<IReader> m_reader2;
  
  	/**
  	 * Buffer used for mixing.
  	 */
  	Buffer m_buffer;
  
  	// delete copy constructor and operator=
  	ModulatorReader(const ModulatorReader&) = delete;
  	ModulatorReader& operator=(const ModulatorReader&) = delete;
  
  public:
  	/**
  	 * Creates a new modulator reader.
  	 * \param reader1 The first reader to read from.
  	 * \param reader2 The second reader to read from.
  	 * \exception Exception Thrown if the specs from the readers differ.
  	 */
  	ModulatorReader(std::shared_ptr<IReader> reader1, std::shared_ptr<IReader> reader2);
  
  	/**
  	 * Destroys the reader.
  	 */
  	virtual ~ModulatorReader();
  
  	virtual bool isSeekable() const;
  	virtual void seek(int position);
  	virtual int getLength() const;
  	virtual int getPosition() const;
  	virtual Specs getSpecs() const;
  	virtual void read(int& length, bool& eos, sample_t* buffer);
  };
  
  AUD_NAMESPACE_END
  