text: /*
   * 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 WebAudioBus_h
  #define WebAudioBus_h
  
  #include "WebCommon.h"
  
  namespace WebCore { class AudioBus; }
  
  #if WEBKIT_IMPLEMENTATION
  namespace WTF { template <typename T> class PassOwnPtr; }
  #endif
  
  namespace WebKit {
  
  class WebAudioBusPrivate;
  
  // A container for multi-channel linear PCM audio data.
  //
  // WARNING: It is not safe to pass a WebAudioBus across threads!!!
  //
  class WebAudioBus {
  public:
      WebAudioBus() : m_private(0) { }
      ~WebAudioBus() { reset(); }
      
      // initialize() allocates memory of the given length for the given number of channels.
      WEBKIT_API void initialize(unsigned numberOfChannels, size_t length, double sampleRate);
  
      // reset() releases the memory allocated from initialize().
      WEBKIT_API void reset();
      
      WEBKIT_API unsigned numberOfChannels() const;
      WEBKIT_API size_t length() const;
      WEBKIT_API double sampleRate() const;
      
      WEBKIT_API float* channelData(unsigned channelIndex);
  
  #if WEBKIT_IMPLEMENTATION
      WTF::PassOwnPtr<WebCore::AudioBus> release();    
  #endif
  
  private:
      // Disallow copy and assign.
      WebAudioBus(const WebAudioBus&);
      void operator=(const WebAudioBus&);
  
      WebCore::AudioBus* m_private;
  };
  
  } // namespace WebKit
  
  #endif // WebAudioBus_h
  