EnvelopeModulator.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 "EnvelopeModulator.hxx"
#include "CLAM_Math.hxx"


namespace CLAM {

        void EnvModulatorConfig::DefaultInit()
        {
                AddAll();
                UpdateData();
                SetSampleRate(44100);
                SetFrameSize(512);
                SetEnvelopeCompression(true);
        }


        EnvelopeModulator::EnvelopeModulator(const EnvModulatorConfig& c)
                : InputEnvelope("Input Envelope",this),
                  InputAudio("Input Audio",this),
                  Output("Output Audio",this)
        {
                Configure(c);
        }

        bool EnvelopeModulator::ConcreteConfigure(const ProcessingConfig& c)
        {
                CopyAsConcreteConfig(mConfig, c);

                mDeltaX = 1000.0/((TTime)mConfig.GetSampleRate());

                mCompress = mConfig.GetEnvelopeCompression();

                InputAudio.SetSize(mConfig.GetFrameSize());
                Output.SetSize(mConfig.GetFrameSize());
                return true;
        }

        TData EnvelopeModulator::Compress(TData x)
        {
                if (x>=0)
                        return 1.0 - exp(-x);
                else
                        return - (1.0 - exp(x));
        }


        bool EnvelopeModulator::Do()
        {
                bool res = Do(InputEnvelope.GetData(),
                                          InputAudio.GetData(),
                                          Output.GetData());
                InputEnvelope.Consume();
                InputAudio.Consume();
                Output.Produce();         
                return res;
        }

        bool EnvelopeModulator::Do(const Envelope& env, const Audio& inp, Audio& out) 
        {
                Array<TData> &inputArray = inp.GetBuffer();
                Array<TData> &outputArray = out.GetBuffer();
                BPFTmpl<TTime,TData> &amplitudeBpf = env.GetAmplitudeBPF();
                TTime pos = 0.0;
                const int size = std::min(inp.GetSize(), out.GetSize());
                if (mCompress)
                        for (int i=0;i<size;i++) {
                                outputArray[i]=inputArray[i]*amplitudeBpf.GetValue(pos);
                                pos += mDeltaX;
                        }
                else
                        for (int i=0;i<size;i++) {
                                outputArray[i]=inputArray[i]*Compress(amplitudeBpf.GetValue(pos));
                                pos += mDeltaX;
                        }
                return true;
        }


}