CircularShift.cxx

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/*
 * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * 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.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include "Audio.hxx"
#include "Spectrum.hxx"
#include "Complex.hxx"
#include "CircularShift.hxx"

namespace CLAM {

        /* Processing  object Method  implementations */

        CircularShift::CircularShift()
                : mInput( "Input samples", this ),
                  mOutput( "Shifted samples", this ),
                  mSteps( "Shift Steps", this )
        {
                Configure(CircularShiftConfig());
        }

        CircularShift::CircularShift(const CircularShiftConfig &c)
                : mInput( "Input samples", this ),
                  mOutput( "Shifted samples", this ),
                  mSteps("Shift Steps",this)
        {
                Configure(c);
        }

        CircularShift::~CircularShift()
        {}


        /* Configure the Processing Object according to the Config object */

        bool CircularShift::ConcreteConfigure(const ProcessingConfig& c)
        {
                CopyAsConcreteConfig(mConfig, c);
                mSteps.DoControl(TData(mConfig.GetAmount()));

                return true;
        }

        /* Setting Prototypes for faster processing */

        bool CircularShift::SetPrototypes(Spectrum& inputs,const Spectrum& out)
        {
                return false;
        }

        bool CircularShift::SetPrototypes()
        {
                return false;
        }

        bool CircularShift::UnsetPrototypes()
        {
                return false;
        }

        /* The supervised Do() function */

        bool CircularShift::Do(void)
        {
                return Do( mInput.GetAudio(), mOutput.GetAudio() );
                mInput.Consume();
                mOutput.Produce();

        }

        /* The  unsupervised Do() function */

        bool CircularShift::Do( const DataArray& in, DataArray& out)
        {

                int i;
                TData amount = mSteps.GetLastValue();
                int size = in.Size();
                const TData* inp = in.GetPtr();
                TData* outp = out.GetPtr();
                TData* tmp;

                CLAM_ASSERT(size == out.Size(),
                        "CircularShift::Do(): input and output vectors do not  match");

                if (amount > 0) {
                        int ia = (int)amount;
                        tmp = new TData[ia];
                        for (i=0;i<ia;i++)
                                tmp[i] = inp[size - ia + i];
                        for (i=size-ia-1;i>= 0;i--)
                                outp[i + ia] = inp[i];
                        for (i=0;i< ia;i++)
                                outp[i] = tmp[i];
                }
                else {
                        int ia = (int)-amount;
                        tmp = new TData[ia];
                        for (i=0;i<ia;i++)
                                tmp[i] = inp[i];
                        for (i=0;i< (size - ia);i++)
                                outp[i] = inp[i+ia];
                        for (i=0;i< ia;i++)
                                outp[i+size-ia] = tmp[i];
                }
                delete[] tmp;
                return true;
        }

        bool CircularShift::Do(Spectrum& in, Spectrum& out)
        {
                CLAM_ASSERT(!in.HasMagBuffer(),
                        "CircularShift::Do(): only implemented for Spectrums with MagBuffer");

                return Do(in.GetMagBuffer(),out.GetMagBuffer());
        }

        bool CircularShift::Do( const Audio& in, Audio& out)
        {
                Do(in.GetBuffer(),out.GetBuffer());
                return true;
        }


}