1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/blink/ZeroPole.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,66 @@
1.4 +/*
1.5 + * Copyright (C) 2011 Google Inc. All rights reserved.
1.6 + *
1.7 + * Redistribution and use in source and binary forms, with or without
1.8 + * modification, are permitted provided that the following conditions
1.9 + * are met:
1.10 + *
1.11 + * 1. Redistributions of source code must retain the above copyright
1.12 + * notice, this list of conditions and the following disclaimer.
1.13 + * 2. Redistributions in binary form must reproduce the above copyright
1.14 + * notice, this list of conditions and the following disclaimer in the
1.15 + * documentation and/or other materials provided with the distribution.
1.16 + * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
1.17 + * its contributors may be used to endorse or promote products derived
1.18 + * from this software without specific prior written permission.
1.19 + *
1.20 + * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
1.21 + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
1.22 + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
1.23 + * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
1.24 + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
1.25 + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
1.26 + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
1.27 + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
1.28 + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
1.29 + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.30 + */
1.31 +
1.32 +#ifndef ZeroPole_h
1.33 +#define ZeroPole_h
1.34 +
1.35 +namespace WebCore {
1.36 +
1.37 +// ZeroPole is a simple filter with one zero and one pole.
1.38 +
1.39 +class ZeroPole {
1.40 +public:
1.41 + ZeroPole()
1.42 + : m_zero(0)
1.43 + , m_pole(0)
1.44 + , m_lastX(0)
1.45 + , m_lastY(0)
1.46 + {
1.47 + }
1.48 +
1.49 + void process(const float *source, float *destination, int framesToProcess);
1.50 +
1.51 + // Reset filter state.
1.52 + void reset() { m_lastX = 0; m_lastY = 0; }
1.53 +
1.54 + void setZero(float zero) { m_zero = zero; }
1.55 + void setPole(float pole) { m_pole = pole; }
1.56 +
1.57 + float zero() const { return m_zero; }
1.58 + float pole() const { return m_pole; }
1.59 +
1.60 +private:
1.61 + float m_zero;
1.62 + float m_pole;
1.63 + float m_lastX;
1.64 + float m_lastY;
1.65 +};
1.66 +
1.67 +} // namespace WebCore
1.68 +
1.69 +#endif // ZeroPole_h
