/usr/include/svxlink/AsyncAudioAmp.h is in libasyncaudio-dev 14.08.1-2.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 | /**
@file AsyncAudioAmp.h
@brief Contains an audio pipe class for amplification/attenuation
@author Tobias Blomberg / SM0SVX
@date 2006-07-08
\verbatim
Async - A library for programming event driven applications
Copyright (C) 2004-2008 Tobias Blomberg / SM0SVX
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
\endverbatim
*/
#ifndef ASYNC_AUDIO_AMP_INCLUDED
#define ASYNC_AUDIO_AMP_INCLUDED
/****************************************************************************
*
* System Includes
*
****************************************************************************/
#include <cmath>
/****************************************************************************
*
* Project Includes
*
****************************************************************************/
#include <AsyncAudioProcessor.h>
/****************************************************************************
*
* Local Includes
*
****************************************************************************/
/****************************************************************************
*
* Forward declarations
*
****************************************************************************/
/****************************************************************************
*
* Namespace
*
****************************************************************************/
namespace Async
{
/****************************************************************************
*
* Forward declarations of classes inside of the declared namespace
*
****************************************************************************/
/****************************************************************************
*
* Defines & typedefs
*
****************************************************************************/
/****************************************************************************
*
* Exported Global Variables
*
****************************************************************************/
/****************************************************************************
*
* Class definitions
*
****************************************************************************/
/**
@brief An audio pipe class for amplification/attenuation of an audio stream
@author Tobias Blomberg / SM0SVX
@date 2006-07-08
Use this class to amplify or attenuate an audio stream.
*/
class AudioAmp : public Async::AudioProcessor
{
public:
/**
* @brief Default constuctor
*/
AudioAmp(void) : m_gain(1.0) {}
/**
* @brief Destructor
*/
~AudioAmp(void) {}
/**
* @brief Set the gain to use
* @param gain_db The gain given in dB
*/
void setGain(float gain_db) { m_gain = powf(10, gain_db / 20); }
/**
* @brief Read the gain
* @return Return the gain in dB
*/
float gain(void) const { return 20 * log10(m_gain); }
protected:
void processSamples(float *dest, const float *src, int count)
{
for (int i=0; i<count; ++i)
{
dest[i] = src[i] * m_gain;
}
}
private:
AudioAmp(const AudioAmp&);
AudioAmp& operator=(const AudioAmp&);
float m_gain;
}; /* class AudioAmp */
} /* namespace */
#endif /* ASYNC_AUDIO_AMP_INCLUDED */
/*
* This file has not been truncated
*/
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