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////////////////////////////////////////////////////////////////////////
// This file is part of the SndObj library
//
// 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
//
// Copyright (c)Victor Lazzarini, 1997-2004
// See License.txt for a disclaimer of all warranties
// and licensing information
//************************************************************//
// Gain.cpp: implementation of the Gain class //
// (Sound Object gain manipulator) //
// //
// //
//************************************************************//
#include "Gain.h"
#include <math.h>
//////////////// CONSTRUCTION / DESTRUCTION ////////////////////
Gain::Gain(){
m_gain = 0.f;
AddMsg("gain", 21);
AddMsg("multiplier", 22);
}
Gain::Gain(float gain, SndObj* InObj, int vecsize, float sr):
SndObj(InObj, vecsize, sr) {
m_gain = dBToAmp(gain);
AddMsg("gain", 21);
AddMsg("multiplier", 22);
}
Gain::~Gain(){
}
////////////////// OPERATIONS ///////////////////////////////
float
Gain::dBToAmp(float amp)
{
amp = (float) pow(10.0, (double) (amp/20));
return amp;
}
int
Gain::Set(char* mess, float value){
switch(FindMsg(mess)){
case 21:
SetGain(value);
return 1;
case 22:
SetGainM(value);
return 1;
default:
return SndObj::Set(mess, value);
}
}
void
Gain::SetGain(float gain)
{
m_gain = dBToAmp(gain);
}
short
Gain::DoProcess(){
if(!m_error){
if(m_input){
for(m_vecpos = 0; m_vecpos < m_vecsize; m_vecpos++){
if(m_enable) m_output[m_vecpos] = m_input->Output(m_vecpos)*m_gain;
else m_output[m_vecpos] = 0.f;
}
return 1;
} else {
m_error=3;
return 0;
}
}
else return 0;
}
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