1 files changed, 0 insertions, 71 deletions
diff --git a/externals/oboe/src/flowgraph/resampler/HyperbolicCosineWindow.h b/externals/oboe/src/flowgraph/resampler/HyperbolicCosineWindow.h
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index 76ec0e70d5..0000000000
--- a/externals/oboe/src/flowgraph/resampler/HyperbolicCosineWindow.h
+++ /dev/null
@@ -1,71 +0,0 @@
-/*
- * Copyright 2019 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef RESAMPLER_HYPERBOLIC_COSINE_WINDOW_H
-#define RESAMPLER_HYPERBOLIC_COSINE_WINDOW_H
-
-#include <math.h>
-
-#include "ResamplerDefinitions.h"
-
-namespace RESAMPLER_OUTER_NAMESPACE::resampler {
-
-/**
- * Calculate a HyperbolicCosineWindow window centered at 0.
- * This can be used in place of a Kaiser window.
- *
- * The code is based on an anonymous contribution by "a concerned citizen":
- * https://dsp.stackexchange.com/questions/37714/kaiser-window-approximation
- */
-class HyperbolicCosineWindow {
-public:
-    HyperbolicCosineWindow() {
-        setStopBandAttenuation(60);
-    }
-
-    /**
-     * @param attenuation typical values range from 30 to 90 dB
-     * @return beta
-     */
-    double setStopBandAttenuation(double attenuation) {
-        double alpha = ((-325.1e-6 * attenuation + 0.1677) * attenuation) - 3.149;
-        setAlpha(alpha);
-        return alpha;
-    }
-
-    void setAlpha(double alpha) {
-        mAlpha = alpha;
-        mInverseCoshAlpha = 1.0 / cosh(alpha);
-    }
-
-    /**
-     * @param x ranges from -1.0 to +1.0
-     */
-    double operator()(double x) {
-        double x2 = x * x;
-        if (x2 >= 1.0) return 0.0;
-        double w = mAlpha * sqrt(1.0 - x2);
-        return cosh(w) * mInverseCoshAlpha;
-    }
-
-private:
-    double mAlpha = 0.0;
-    double mInverseCoshAlpha = 1.0;
-};
-
-} /* namespace RESAMPLER_OUTER_NAMESPACE::resampler */
-
-#endif //RESAMPLER_HYPERBOLIC_COSINE_WINDOW_H