Move everything into a separate futatabi/ subdir, for the upcoming merge with Futatabi.

[nageru] / correlation_measurer.cpp

diff --git a/correlation_measurer.cpp b/correlation_measurer.cpp
deleted file mode 100644 (file)
index d0150a0..0000000
--- a/correlation_measurer.cpp
+++ /dev/null
@@ -1,72 +0,0 @@
-// Adapted from Adriaensen's project Zita-mu1 (as of January 2016).
-// Original copyright follows:
-//
-//  Copyright (C) 2008-2015 Fons Adriaensen <fons@linuxaudio.org>
-//    
-//  This program is free software; you can redistribute it and/or modify
-//  it under the terms of the GNU General Public License as published by
-//  the Free Software Foundation; either version 3 of the License, or
-//  (at your option) any later version.
-//
-//  This program is distributed in the hope that it will be useful,
-//  but WITHOUT ANY WARRANTY; without even the implied warranty of
-//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-//  GNU General Public License for more details.
-//
-//  You should have received a copy of the GNU General Public License
-//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-#include "correlation_measurer.h"
-
-#include <assert.h>
-#include <cmath>
-#include <cstddef>
-
-using namespace std;
-
-CorrelationMeasurer::CorrelationMeasurer(unsigned sample_rate,
-                                         float lowpass_cutoff_hz,
-                                        float falloff_seconds)
-    : w1(2.0 * M_PI * lowpass_cutoff_hz / sample_rate),
-      w2(1.0 / (falloff_seconds * sample_rate))
-{
-}
-
-void CorrelationMeasurer::reset()
-{
-       zl = zr = zll = zlr = zrr = 0.0f;
-}
-
-void CorrelationMeasurer::process_samples(const std::vector<float> &samples)
-{
-       assert(samples.size() % 2 == 0);
-
-       // The compiler isn't always happy about modifying members,
-       // since it doesn't always know they can't alias on <samples>.
-       // Help it out a bit.
-       float l = zl, r = zr, ll = zll, lr = zlr, rr = zrr;
-       const float w1c = w1, w2c = w2;
-
-       for (size_t i = 0; i < samples.size(); i += 2) {
-               // The 1e-15f epsilon is to avoid denormals.
-               // TODO: Just set the SSE flush-to-zero flags instead.
-               l += w1c * (samples[i + 0] - l) + 1e-15f;
-               r += w1c * (samples[i + 1] - r) + 1e-15f;
-               lr += w2c * (l * r - lr);
-               ll += w2c * (l * l - ll);
-               rr += w2c * (r * r - rr);
-       }
-
-       zl = l;
-       zr = r;
-       zll = ll;
-       zlr = lr;
-       zrr = rr;
-}
-
-float CorrelationMeasurer::get_correlation() const
-{
-       // The 1e-12f epsilon is to avoid division by zero.
-       // zll and zrr are both always non-negative, so we do not risk negative values.
-       return zlr / sqrt(zll * zrr + 1e-12f);
-}