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      1 /*
      2  * Copyright (C) 2009 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #ifndef Panner_h
     30 #define Panner_h
     31 
     32 #include <wtf/PassOwnPtr.h>
     33 
     34 namespace WebCore {
     35 
     36 class AudioBus;
     37 
     38 // Abstract base class for panning a mono or stereo source.
     39 
     40 class Panner {
     41 public:
     42     enum {
     43         PanningModelEqualPower = 0,
     44         PanningModelHRTF = 1,
     45         PanningModelSoundField = 2
     46     };
     47 
     48     typedef unsigned PanningModel;
     49 
     50     static PassOwnPtr<Panner> create(PanningModel model, double sampleRate);
     51 
     52     virtual ~Panner() { };
     53 
     54     PanningModel panningModel() const { return m_panningModel; }
     55 
     56     virtual void pan(double azimuth, double elevation, AudioBus* inputBus, AudioBus* outputBus, size_t framesToProcess) = 0;
     57 
     58     virtual void reset() = 0;
     59 
     60 protected:
     61     Panner(PanningModel model) : m_panningModel(model) { }
     62 
     63     PanningModel m_panningModel;
     64 };
     65 
     66 } // namespace WebCore
     67 
     68 #endif // Panner_h
     69