Line data    Source code

       1             : /*
       2             :  * Copyright (C) 2011 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 ZeroPole_h
      30             : #define ZeroPole_h
      31             : 
      32             : namespace WebCore {
      33             : 
      34             : // ZeroPole is a simple filter with one zero and one pole.
      35             : 
      36             : class ZeroPole {
      37             : public:
      38           0 :     ZeroPole()
      39           0 :         : m_zero(0)
      40             :         , m_pole(0)
      41             :         , m_lastX(0)
      42           0 :         , m_lastY(0)
      43             :     {
      44           0 :     }
      45             : 
      46             :     void process(const float *source, float *destination, int framesToProcess);
      47             : 
      48             :     // Reset filter state.
      49           0 :     void reset() { m_lastX = 0; m_lastY = 0; }
      50             : 
      51           0 :     void setZero(float zero) { m_zero = zero; }
      52           0 :     void setPole(float pole) { m_pole = pole; }
      53             : 
      54             :     float zero() const { return m_zero; }
      55             :     float pole() const { return m_pole; }
      56             : 
      57             : private:
      58             :     float m_zero;
      59             :     float m_pole;
      60             :     float m_lastX;
      61             :     float m_lastY;
      62             : };
      63             : 
      64             : } // namespace WebCore
      65             : 
      66             : #endif // ZeroPole_h