This file is indexed.

/usr/include/qm-dsp/base/SincWindow.h is in libqm-dsp-dev 1.7.1-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    QM DSP library
    Centre for Digital Music, Queen Mary, University of London.
 
    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 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef SINC_WINDOW_H
#define SINC_WINDOW_H

#include <vector>

/**
 * A window containing values of the sinc function, i.e. sin(x)/x with
 * sinc(0) == 1, with x == 0 at the centre.
 */
class SincWindow
{
public:
    /**
     * Construct a windower of the given length, containing the values
     * of sinc(x) with x=0 in the middle, i.e. at sample (length-1)/2
     * for odd or (length/2)+1 for even length, such that the distance
     * from -pi to pi (the nearest zero crossings either side of the
     * peak) is p samples.
     */
    SincWindow(int length, double p) : m_length(length), m_p(p) { init(); }

    int getLength() const {
	return m_length;
    }

    const double *getWindow() const { 
	return m_window.data();
    }

    void cut(double *src) const { 
	cut(src, src); 
    }

    void cut(const double *src, double *dst) const {
	for (int i = 0; i < m_length; ++i) {
	    dst[i] = src[i] * m_window[i];
	}
    }

private:
    int m_length;
    double m_p;
    std::vector<double> m_window;

    void init();
};

#endif