michael@0: ////////////////////////////////////////////////////////////////////////////////
michael@0: /// 
michael@0: /// Linear interpolation routine.
michael@0: ///
michael@0: /// Author        : Copyright (c) Olli Parviainen
michael@0: /// Author e-mail : oparviai 'at' iki.fi
michael@0: /// SoundTouch WWW: http://www.surina.net/soundtouch
michael@0: ///
michael@0: ////////////////////////////////////////////////////////////////////////////////
michael@0: //
michael@0: // $Id: InterpolateLinear.h 179 2014-01-06 18:41:42Z oparviai $
michael@0: //
michael@0: ////////////////////////////////////////////////////////////////////////////////
michael@0: //
michael@0: // License :
michael@0: //
michael@0: //  SoundTouch audio processing library
michael@0: //  Copyright (c) Olli Parviainen
michael@0: //
michael@0: //  This library is free software; you can redistribute it and/or
michael@0: //  modify it under the terms of the GNU Lesser General Public
michael@0: //  License as published by the Free Software Foundation; either
michael@0: //  version 2.1 of the License, or (at your option) any later version.
michael@0: //
michael@0: //  This library is distributed in the hope that it will be useful,
michael@0: //  but WITHOUT ANY WARRANTY; without even the implied warranty of
michael@0: //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
michael@0: //  Lesser General Public License for more details.
michael@0: //
michael@0: //  You should have received a copy of the GNU Lesser General Public
michael@0: //  License along with this library; if not, write to the Free Software
michael@0: //  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
michael@0: //
michael@0: ////////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: #ifndef _InterpolateLinear_H_
michael@0: #define _InterpolateLinear_H_
michael@0: 
michael@0: #include "RateTransposer.h"
michael@0: #include "STTypes.h"
michael@0: 
michael@0: namespace soundtouch
michael@0: {
michael@0: 
michael@0: /// Linear transposer class that uses integer arithmetics
michael@0: class InterpolateLinearInteger : public TransposerBase
michael@0: {
michael@0: protected:
michael@0:     int iFract;
michael@0:     int iRate;
michael@0: 
michael@0:     virtual void resetRegisters();
michael@0: 
michael@0:     virtual int transposeMono(SAMPLETYPE *dest, 
michael@0:                        const SAMPLETYPE *src, 
michael@0:                        int &srcSamples);
michael@0:     virtual int transposeStereo(SAMPLETYPE *dest, 
michael@0:                          const SAMPLETYPE *src, 
michael@0:                          int &srcSamples);
michael@0:     virtual int transposeMulti(SAMPLETYPE *dest, const SAMPLETYPE *src, int &srcSamples);
michael@0: public:
michael@0:     InterpolateLinearInteger();
michael@0: 
michael@0:     /// Sets new target rate. Normal rate = 1.0, smaller values represent slower 
michael@0:     /// rate, larger faster rates.
michael@0:     virtual void setRate(float newRate);
michael@0: };
michael@0: 
michael@0: 
michael@0: /// Linear transposer class that uses floating point arithmetics
michael@0: class InterpolateLinearFloat : public TransposerBase
michael@0: {
michael@0: protected:
michael@0:     float fract;
michael@0: 
michael@0:     virtual void resetRegisters();
michael@0: 
michael@0:     virtual int transposeMono(SAMPLETYPE *dest, 
michael@0:                        const SAMPLETYPE *src, 
michael@0:                        int &srcSamples);
michael@0:     virtual int transposeStereo(SAMPLETYPE *dest, 
michael@0:                          const SAMPLETYPE *src, 
michael@0:                          int &srcSamples);
michael@0:     virtual int transposeMulti(SAMPLETYPE *dest, const SAMPLETYPE *src, int &srcSamples);
michael@0: 
michael@0: public:
michael@0:     InterpolateLinearFloat();
michael@0: };
michael@0: 
michael@0: }
michael@0: 
michael@0: #endif