jthedering
90ee2b0aa9
Added: Filter type "IIR", which allows to specify a user-defined IIR filter of arbitrary order with custom coefficients. Improved: For playback devices, the APO is now installed both as GFX (post-mix) and LFX (pre-mix) APO. Normally the filtering happens in GFX, but the command "Stage" allows to select LFX to apply effects based on the number of input channels. Added: Expression language. The commands "If", "ElseIf", "Else", "EndIf", "Eval" and inline expressions allow to change the filter behaviour based on runtime conditions. Added: Command "Copy", which copies audio data between channels. Added: Command "Delay", which delays the audio on the currently selected channels. Improved: Configuration files are now locked exclusively for writing while reading them. Improved: There is now a transition (10 ms) from old to new configuration after loading. Improved: Substantial internal restructuring to improve extensibility and maintainability. Filtering commands now work exactly in the order they were specified. Fixed: When the microphone input was in stereo but the application requested a mono stream, the audio was heavily distorted. Fixed: The sine sweep generated by the Benchmark application had floating-point precision issues leading to severe artifacts when certain filters were applied.
109 lines
3.2 KiB
C++
109 lines
3.2 KiB
C++
/*
|
|
This file is part of EqualizerAPO, a system-wide equalizer.
|
|
Copyright (C) 2014 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.
|
|
*/
|
|
|
|
#define _USE_MATH_DEFINES
|
|
#include <cmath>
|
|
#include <regex>
|
|
#include <sstream>
|
|
|
|
#include "helpers/MemoryHelper.h"
|
|
#include "helpers/StringHelper.h"
|
|
#include "helpers/LogHelper.h"
|
|
#include "IIRFilter.h"
|
|
#include "IIRFilterFactory.h"
|
|
|
|
using namespace std;
|
|
|
|
static wregex regexType(L"^\\s*ON\\s+([A-Za-z]+)");
|
|
static wregex regexOrder(L"\\s*Order\\s+([0-9]+)");
|
|
static wregex regexCoefficients(L"\\s+Coefficients((?: [-+0-9.eE]+)+)");
|
|
|
|
IIRFilterFactory::IIRFilterFactory()
|
|
{
|
|
}
|
|
|
|
vector<IFilter*> IIRFilterFactory::createFilter(const wstring& configPath, wstring& command, wstring& parameters)
|
|
{
|
|
IIRFilter* filter = NULL;
|
|
|
|
if(command.find(L"Filter") == 0)
|
|
{
|
|
wsmatch match;
|
|
wstring typeString;
|
|
|
|
bool found = regex_search(parameters, match, regexType);
|
|
if(found)
|
|
{
|
|
typeString = match.str(1);
|
|
if(typeString == L"IIR")
|
|
{
|
|
bool found = regex_search(parameters, match, regexOrder);
|
|
if(found)
|
|
{
|
|
wstring orderString = match.str(1);
|
|
unsigned order = wcstol(orderString.c_str(), NULL, 10);
|
|
|
|
if(order<1)
|
|
{
|
|
LogF(L"Order %d not supported, must at least be 1", order);
|
|
}
|
|
else
|
|
{
|
|
found = regex_search(parameters, match, regexCoefficients);
|
|
|
|
if(found)
|
|
{
|
|
wstring coefficientsString = match.str(1);
|
|
vector<wstring> coefficientStrings = StringHelper::split(coefficientsString, L' ');
|
|
if(coefficientStrings.size() != (order + 1) * 2)
|
|
{
|
|
LogF(L"Invalid number of coefficients. Expected %d coefficients instead of %d", (order + 1) * 2, coefficientStrings.size());
|
|
}
|
|
else
|
|
{
|
|
vector<double> coefficients;
|
|
for(auto it = coefficientStrings.begin(); it!=coefficientStrings.end(); it++)
|
|
{
|
|
coefficients.push_back(wcstod(it->c_str(), NULL));
|
|
}
|
|
|
|
wstringstream stream;
|
|
stream << L"Adding IIR filter of order " << order << " with coefficients";
|
|
for(unsigned i=0; i<=order; i++)
|
|
stream << L" b" << i << L"=" << coefficients[i];
|
|
for(unsigned i=0; i<=order; i++)
|
|
stream << L" a" << i << L"=" << coefficients[i + order + 1];
|
|
|
|
TraceF(L"%s", stream.str().c_str());
|
|
|
|
void* mem = MemoryHelper::alloc(sizeof(IIRFilter));
|
|
filter = new(mem) IIRFilter(coefficients);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if(filter == NULL)
|
|
return vector<IFilter*>(0);
|
|
return vector<IFilter*>(1, filter);
|
|
}
|