/usr/include/CLAM/AudioBufferAmplifier.hxx is in libclam-dev 1.4.0-7.
This file is owned by root:root, with mode 0o644.
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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{
/**
* AudioBufferAmplifier configuration object.
*/
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();
};
/** \brief Time-domain audio gain
*
* Very simple time-domain linear audio amplifier. For lower the volume choose values between 0 and 1.
* Values over 1 will amplify the audio signal. Gain=1 means no change.
*/
class AudioBufferAmplifier: public Processing
{
/** This method returns the name of the object
* @return Char pointer with the name of object
*/
const char *GetClassName() const { return "AudioBufferAmplifier"; }
/** Ports **/
std::vector<InPort<Audio>*> _inputs;
std::vector<OutPort<Audio>*> _outputs;
/** Controls **/
FloatInControl _gainControl; ///< gain control
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
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