Remove ZeroPole class and files

third_party/WebKit/Source/platform/audio/ZeroPole.cpp

-/*
- * 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.
- */
-
-#include "platform/audio/ZeroPole.h"
-#include "platform/audio/DenormalDisabler.h"
-
-namespace blink {
-
-void ZeroPole::process(const float* source,
-                       float* destination,
-                       unsigned framesToProcess) {
-  float zero = m_zero;
-  float pole = m_pole;
-
-  // Gain compensation to make 0dB @ 0Hz
-  const float k1 = 1 / (1 - zero);
-  const float k2 = 1 - pole;
-
-  // Member variables to locals.
-  float lastX = m_lastX;
-  float lastY = m_lastY;
-
-  while (framesToProcess--) {
-    float input = *source++;
-
-    // Zero
-    float output1 = k1 * (input - zero * lastX);
-    lastX = input;
-
-    // Pole
-    float output2 = k2 * output1 + pole * lastY;
-    lastY = output2;
-
-    *destination++ = output2;
-  }
-
-  // Locals to member variables. Flush denormals here so we don't
-  // slow down the inner loop above.
-  m_lastX = DenormalDisabler::flushDenormalFloatToZero(lastX);
-  m_lastY = DenormalDisabler::flushDenormalFloatToZero(lastY);
-}
-
-}  // namespace blink