media/libsoundtouch/src/InterpolateShannon.h
author Joel Maher <jmaher@mozilla.com>
Mon, 09 Oct 2017 11:10:33 -0400
changeset 432329 b92b69f3503e71ea7a7184f3f56526aafa57d999
parent 196448 a5f46ce505386d8c814ff6ab142069363734314a
permissions -rw-r--r--
Bug 1243263 - Disable browser_notification_tab_switching.js for frequency failures. r=me, a=test-only

////////////////////////////////////////////////////////////////////////////////
/// 
/// Sample interpolation routine using 8-tap band-limited Shannon interpolation 
/// with kaiser window.
///
/// Notice. This algorithm is remarkably much heavier than linear or cubic
/// interpolation, and not remarkably better than cubic algorithm. Thus mostly
/// for experimental purposes
///
/// Author        : Copyright (c) Olli Parviainen
/// Author e-mail : oparviai 'at' iki.fi
/// SoundTouch WWW: http://www.surina.net/soundtouch
///
////////////////////////////////////////////////////////////////////////////////
//
// $Id: InterpolateShannon.h 179 2014-01-06 18:41:42Z oparviai $
//
////////////////////////////////////////////////////////////////////////////////
//
// License :
//
//  SoundTouch audio processing library
//  Copyright (c) Olli Parviainen
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2.1 of the License, or (at your option) any later version.
//
//  This library 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
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
////////////////////////////////////////////////////////////////////////////////

#ifndef _InterpolateShannon_H_
#define _InterpolateShannon_H_

#include "RateTransposer.h"
#include "STTypes.h"

namespace soundtouch
{

class InterpolateShannon : public TransposerBase
{
protected:
    void resetRegisters();
    int transposeMono(SAMPLETYPE *dest, 
                        const SAMPLETYPE *src, 
                        int &srcSamples);
    int transposeStereo(SAMPLETYPE *dest, 
                        const SAMPLETYPE *src, 
                        int &srcSamples);
    int transposeMulti(SAMPLETYPE *dest, 
                        const SAMPLETYPE *src, 
                        int &srcSamples);

    float fract;

public:
    InterpolateShannon();
};

}

#endif