AudioBufferAmplifier.hxx

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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
 *
 */

#ifndef _AudioBufferAmplifier_
#define _AudioBufferAmplifier_

#include "Processing.hxx"
#include "ProcessingConfig.hxx"
#include "Audio.hxx"
#include "InPort.hxx"
#include "OutPort.hxx"
#include "InControl.hxx"

namespace CLAM{

        class AudioAmplifierConfig : public ProcessingConfig
        {
        public:
                DYNAMIC_TYPE_USING_INTERFACE( AudioAmplifierConfig, 3, ProcessingConfig );
                DYN_ATTRIBUTE( 0, public, double, MaxGain );
                DYN_ATTRIBUTE( 1, public, double, InitGain);
                DYN_ATTRIBUTE( 2, public, int, PortsNumber);

        protected:
                void DefaultInit();
        };


        class AudioBufferAmplifier: public Processing
        {
                const char *GetClassName() const { return "AudioBufferAmplifier"; }

                std::vector<InPort<Audio>*> _inputs;
                std::vector<OutPort<Audio>*> _outputs;

                FloatInControl _gainControl; 

        public:
                AudioBufferAmplifier(const ProcessingConfig & config=Config())
                        : _gainControl("Gain", this)
                {
                        Configure(config);
                }

                ~AudioBufferAmplifier()
                {
                        ResizePorts(0);
                }

                bool Do()
                {
                        bool result=true;
                        TData gain = _gainControl.GetLastValue();
                        for (unsigned i=0; i<_inputs.size(); i++)
                        {
                                result &= Do( _inputs[i]->GetData(), _outputs[i]->GetData(), gain );
                                _inputs[i]->Consume();
                                _outputs[i]->Produce();
                        }
                        _previousGain = gain;
                        return result;
                }

                bool Do(const Audio& in, Audio& out, float gain)
                {
                        int size = in.GetSize();
                        out.SetSize(size);
                        const TData * inb = in.GetBuffer().GetPtr();
                        TData * outb = out.GetBuffer().GetPtr();
                        TData gainDelta=(gain-_previousGain)/size;
                        TData rampedGain = _previousGain;

                        for (int i=0;i<size;i++)
                        {
                                outb[i] = inb[i]*rampedGain;
                                rampedGain+=gainDelta;
                        }
                        return true;
                }

                typedef AudioAmplifierConfig Config;

        virtual bool SupportsVariableAudioSize() const {return true;}

        protected:
                const ProcessingConfig& GetConfig() const { return _config; }
                bool ConcreteConfigure(const ProcessingConfig& config) {

                        CopyAsConcreteConfig( _config, config );
                        double max_gain = _config.GetMaxGain();
                        double init_gain = _config.HasInitGain() ? _config.GetInitGain() : 1. ;
                        _gainControl.SetBounds(0.,max_gain);
                        _gainControl.SetDefaultValue(init_gain);
                        _gainControl.DoControl(init_gain);
                        _previousGain = init_gain;
                        ResizePorts(_config.HasPortsNumber()?_config.GetPortsNumber():1);
                        return true;
                }
        private:
                void ResizePorts(unsigned newSize);

                Config _config;
                TData _previousGain;
        };

};//namespace CLAM

#endif // AudioBufferAmplifier