jthedering
b8cdd47f71
Added: Configuration Editor, which allows to edit configurations in a graphical user interface. Contains GUIs for most commands supported by E-APO, but as lines can also be edited directly, all commands can be used. Added: Command "GraphicEQ", which can act as a regular, fixed-band graphic equalizer (via the GUI) but also supports variable bands so that any desired frequency response can be specified. Internally, it is implemented via convolution with a generated IR. Added: Command "Convolution", which allows to convolve the signal with a user-provided impulse response to achieve e.g. equalization or reverberation effects. Improved: Configurator performs checks for registry values that are needed for the operation of E-APO, which may be changed by driver installations, fixing the values if necessary. Improved: Configurator shows which is the default device as a hint to the user.
93 lines
2.4 KiB
C++
93 lines
2.4 KiB
C++
/*
|
|
This file is part of EqualizerAPO, a system-wide equalizer.
|
|
Copyright (C) 2015 Jonas Thedering
|
|
|
|
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.,
|
|
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include "stdafx.h"
|
|
#include <algorithm>
|
|
|
|
#include "GainIterator.h"
|
|
|
|
using namespace std;
|
|
|
|
GainIterator::GainIterator(const vector<FilterNode>& nodes)
|
|
{
|
|
this->nodes = nodes;
|
|
nodeLeft = NULL;
|
|
nodeRight = NULL;
|
|
}
|
|
|
|
double GainIterator::gainAt(double freq)
|
|
{
|
|
if(nodeLeft == NULL && nodeRight == NULL || nodeLeft != NULL && freq < nodeLeft->freq)
|
|
{
|
|
FilterNode findNode(freq, 0);
|
|
vector<FilterNode>::iterator it = lower_bound(nodes.begin(), nodes.end(), findNode);
|
|
if(it != nodes.begin())
|
|
nodeLeft = &*(it - 1);
|
|
if(it != nodes.end())
|
|
nodeRight = &*it;
|
|
|
|
if(nodeLeft != NULL && nodeRight != NULL)
|
|
{
|
|
logLeft = log(nodeLeft->freq);
|
|
logRightMinusLeft = log(nodeRight->freq) - logLeft;
|
|
}
|
|
}
|
|
else if(nodeRight != NULL && freq > nodeRight->freq)
|
|
{
|
|
vector<FilterNode>::iterator it = nodes.begin() + (nodeRight - &*nodes.begin());
|
|
while(it != nodes.end() && freq > it->freq)
|
|
{
|
|
it++;
|
|
}
|
|
if(it == nodes.end())
|
|
nodeRight = NULL;
|
|
else
|
|
nodeRight = &*it;
|
|
|
|
if(it != nodes.begin())
|
|
nodeLeft = &*(it - 1);
|
|
|
|
if(nodeLeft != NULL && nodeRight != NULL)
|
|
{
|
|
logLeft = log(nodeLeft->freq);
|
|
logRightMinusLeft = log(nodeRight->freq) - logLeft;
|
|
}
|
|
}
|
|
|
|
double dbGain;
|
|
if(nodeLeft == NULL)
|
|
{
|
|
if(nodeRight == NULL)
|
|
dbGain = 0.0;
|
|
else
|
|
dbGain = nodeRight->dbGain;
|
|
}
|
|
else if(nodeRight == NULL)
|
|
{
|
|
dbGain = nodeLeft->dbGain;
|
|
}
|
|
else
|
|
{
|
|
double t = (log(freq) - logLeft) / logRightMinusLeft;
|
|
dbGain = nodeLeft->dbGain + t * (nodeRight->dbGain - nodeLeft->dbGain);
|
|
}
|
|
|
|
return dbGain;
|
|
}
|