| /* |
| * Copyright (C) 2011 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. |
| * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
| * its contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE 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 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 ZeroPole_h |
| #define ZeroPole_h |
| |
| #include "platform/PlatformExport.h" |
| |
| namespace WebCore { |
| |
| // ZeroPole is a simple filter with one zero and one pole. |
| |
| class PLATFORM_EXPORT ZeroPole { |
| public: |
| ZeroPole() |
| : m_zero(0) |
| , m_pole(0) |
| , m_lastX(0) |
| , m_lastY(0) |
| { |
| } |
| |
| void process(const float *source, float *destination, unsigned framesToProcess); |
| |
| // Reset filter state. |
| void reset() { m_lastX = 0; m_lastY = 0; } |
| |
| void setZero(float zero) { m_zero = zero; } |
| void setPole(float pole) { m_pole = pole; } |
| |
| float zero() const { return m_zero; } |
| float pole() const { return m_pole; } |
| |
| private: |
| float m_zero; |
| float m_pole; |
| float m_lastX; |
| float m_lastY; |
| }; |
| |
| } // namespace WebCore |
| |
| #endif // ZeroPole_h |