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accountcreator.cpp

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    dcblocker.cpp 2.53 KiB
    /*
     *  Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010, 2011 Savoir-Faire Linux Inc.
     *  Author: Alexandre Savard <alexandre.savard@savoirfairelinux.com>
     *
     *  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, write to the Free Software
     *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
     *
     *  Additional permission under GNU GPL version 3 section 7:
     *
     *  If you modify this program, or any covered work, by linking or
     *  combining it with the OpenSSL project's OpenSSL library (or a
     *  modified version of that library), containing parts covered by the
     *  terms of the OpenSSL or SSLeay licenses, Savoir-Faire Linux Inc.
     *  grants you additional permission to convey the resulting work.
     *  Corresponding Source for a non-source form of such a combination
     *  shall include the source code for the parts of OpenSSL used as well
     *  as that of the covered work.
     */
    
    #include "dcblocker.h"
    
    DcBlocker::DcBlocker() : _y (0), _x (0), _xm1 (0), _ym1 (0) {}
    
    DcBlocker::~DcBlocker() {}
    
    void DcBlocker::reset()
    {
        _y = 0;
        _x = 0;
        _xm1 = 0;
        _ym1 = 0;
    }
    
    void DcBlocker::putData (SFLDataFormat *inputData UNUSED, int nbBytes UNUSED) {}
    
    int DcBlocker::getData (SFLDataFormat *outputData UNUSED)
    {
        return 0;
    }
    
    void DcBlocker::process (SFLDataFormat *data, int nbBytes)
    {
        // y(n) = x(n) - x(n-1) + R y(n-1) , R = 0.9999
    
        int nbSamples = nbBytes / sizeof (SFLDataFormat);
    
        for (int i = 0; i < nbSamples; i++) {
            _x = data[i];
    
            _y = (SFLDataFormat) ( (float) _x - (float) _xm1 + 0.995 * (float) _ym1);
            _xm1 = _x;
            _ym1 = _y;
    
            data[i] = _y;
    
        }
    }
    
    int DcBlocker::process (SFLDataFormat *inputData, SFLDataFormat *outputData, int nbBytes)
    {
    
        int nbSamples = nbBytes / sizeof (SFLDataFormat);
    
        for (int i = 0; i < nbSamples; i++) {
    
            _x = inputData[i];
    
            _y = (SFLDataFormat) ( (float) _x - (float) _xm1 + 0.9999 * (float) _ym1);
            _xm1 = _x;
            _ym1 = _y;
    
            outputData[i] = _y;
        }
    
        return 0;
    
    }