/usr/include/CLAM/AudioBufferAmplifier.hxx is in libclam-dev 1.4.0-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | /*
* 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
|