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EqualizerAPO/ParametricEQ.cpp
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/*
This file is part of EqualizerAPO, a system-wide equalizer.
Copyright (C) 2012 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 <cstdio>
#define _USE_MATH_DEFINES
#include <cmath>
#include <string>
#include <fstream>
#include <sstream>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <Shlwapi.h>
#include "StringHelper.h"
#include "RegistryHelper.h"
#include "LogHelper.h"
#include "ParametricEQ.h"
using namespace std;
BiQuad::BiQuad(float dbGain, float freq, float srate, float bandwidthOrQ, bool isQ)
{
float A = pow(10, dbGain / 40);
float omega = 2 * (float)M_PI * freq / srate;
float sn = sin(omega);
float cs = cos(omega);
float alpha;
if(isQ)
alpha = sn / (2 * bandwidthOrQ);
else
alpha = sn * sinh((float)M_LN2/2 * bandwidthOrQ * omega / sn);
float temp = 1 + (alpha /A);
a0 = (1 + (alpha * A)) / temp;
a[0] = (-2 * cs) / temp;
a[1] = (1 - (alpha * A)) / temp;
a[2] = - (-2 * cs) / temp;
a[3] = - (1 - (alpha /A)) / temp;
}
ParametricEQ::ParametricEQ()
{
filterCount = 0;
channelCount = 0;
preamp = 1.0f;
memset(sampleData, 0, 1000 * sizeof(float));
lastInputWasSilent = false;
threadHandle = NULL;
}
ParametricEQ::~ParametricEQ()
{
if(threadHandle != NULL)
{
SetEvent(shutdownEvent);
if(WaitForSingleObject(threadHandle, INFINITE) == WAIT_OBJECT_0)
{
TraceF(L"Successfully terminated directory change notification thread", configPath.c_str());
}
CloseHandle(shutdownEvent);
CloseHandle(threadHandle);
threadHandle = NULL;
}
}
void ParametricEQ::setDeviceInfo(const wstring& deviceName, const wstring& connectionName, const wstring& deviceGuid)
{
this->deviceName = deviceName;
this->connectionName = connectionName;
this->deviceGuid = deviceGuid;
}
void ParametricEQ::initialize(float sampleRate, unsigned channelCount)
{
this->sampleRate = sampleRate;
this->channelCount = channelCount;
memset(sampleData, 0, 1000 * sizeof(float));
filterCount = 0;
preamp = 1.0f;
try
{
configPath = RegistryHelper::readValue(APP_REGPATH, L"ConfigPath");
}
catch(RegistryException e)
{
LogF(L"Can't read config path because of: %s", e.getMessage());
return;
}
if(configPath != L"")
{
loadConfig();
if(threadHandle == NULL)
{
shutdownEvent = CreateEventW(NULL, true, false, NULL);
threadHandle = CreateThread(NULL, 0, notificationThread, this, 0, NULL);
if(threadHandle == INVALID_HANDLE_VALUE)
threadHandle = NULL;
else
{
TraceF(L"Successfully created directory change notification thread for %s and its subtree", configPath.c_str());
}
}
}
}
void ParametricEQ::loadConfig()
{
unsigned loadFilterCount = 0;
float loadPreamp = 1.0f;
loadConfig(configPath + L"\\config.txt", loadFilterCount, loadPreamp);
TraceF(L"%d filters loaded", loadFilterCount);
preamp = loadPreamp;
filterCount = loadFilterCount;
}
void ParametricEQ::loadConfig(wstring path, unsigned& loadFilterCount, float& loadPreamp)
{
TraceF(L"Loading configuration from %s", path.c_str());
ifstream inputStream(path);
if(!inputStream.good())
{
LogF(L"Config file not found at %s!", path.c_str());
return;
}
boolean deviceMatches = true;
wstring deviceString = StringHelper::toLowerCase(deviceName + L" " + connectionName + L" " + deviceGuid);
while(!inputStream.eof())
{
string encodedLine;
getline(inputStream, encodedLine);
wstring line = StringHelper::toWString(encodedLine, CP_UTF8);
if(line.find(L'\uFFFD') != -1)
line = StringHelper::toWString(encodedLine, CP_ACP);
size_t pos = line.find(L':');
if(pos != -1)
{
wstring key = line.substr(0, pos);
wstring value = line.substr(pos + 1);
if(key == L"Device")
{
value = value + L";";
vector<vector<wstring>> fullList;
vector<wstring> currentList;
wstring currentWord;
for(unsigned i=0; i<value.length(); i++)
{
wchar_t c = value[i];
if(c == L' ' || c == L';')
{
if(currentWord.length() > 0)
{
currentList.push_back(currentWord);
currentWord.clear();
}
if(c == L';' && currentList.size() > 0)
{
fullList.push_back(currentList);
currentList.clear();
}
}
else
{
currentWord += value[i];
}
}
boolean matches = false;
for(unsigned i=0; i<fullList.size(); i++)
{
matches = true;
if(fullList[i].size() == 1 && StringHelper::toLowerCase(fullList[i][0]) == L"all")
break;
for(unsigned j=0; j<fullList[i].size(); j++)
{
wstring word = StringHelper::toLowerCase(fullList[i][j]);
if(deviceString.find(word) == -1)
{
matches = false;
break;
}
}
if(matches)
break;
}
TraceF(L"%satching device \"%s\" \"%s\" \"%s\" with pattern \"%s\"", matches ? L"M" : L"Not m", deviceName.c_str(), connectionName.c_str(), deviceGuid.c_str(), value.c_str());
deviceMatches = matches;
}
if(!deviceMatches)
continue;
if(key.find(L"Filter") == 0)
{
//Conversion to period as decimal mark, if needed
value = StringHelper::replaceCharacters(value, L",", L'.');
if(loadFilterCount < (sizeof(filters)/sizeof(BiQuad)))
{
wchar_t freqString[10];
float freq, gain, bandwidth;
int matched = swscanf_s(value.c_str(), L" ON PEQ Fc %9s Hz Gain %f dB BW Oct %f", &freqString, 10, &gain, &bandwidth);
if(matched == 3 && (freq = getFreq(freqString)) != -1.0f)
{
filters[loadFilterCount++] = BiQuad(gain, freq, sampleRate, bandwidth, false);
TraceF(L"Adding filter with center frequency %g Hz, gain %g dB and bandwidth %g octaves", freq, gain, bandwidth);
}
else
{
float q;
matched = swscanf_s(value.c_str(), L" ON PK Fc %9s Hz Gain %f dB Q %f", &freqString, 10, &gain, &q);
if(matched == 3 && (freq = getFreq(freqString)) != -1.0f)
{
filters[loadFilterCount++] = BiQuad(gain, freq, sampleRate, q, true);
TraceF(L"Adding filter with center frequency %g Hz, gain %g dB and Q %g", freq, gain, q);
}
}
}
}
else if(key == L"Preamp")
{
//Conversion to period as decimal mark, if needed
value = StringHelper::replaceCharacters(value, L",", L'.');
float preamp_dB;
int matched = swscanf_s(value.c_str(), L" %f dB", &preamp_dB);
if(matched == 1)
{
loadPreamp = pow(10.0f, preamp_dB / 20.0f);
TraceF(L"Setting preamp to %g dB", preamp_dB);
}
}
else if(key == L"Include")
{
while(value.length() > 0 && iswspace(value[0]))
value = value.substr(1);
wstring includePath;
if(PathIsRelativeW(value.c_str()))
{
wchar_t filePath[MAX_PATH];
path._Copy_s(filePath, sizeof(filePath), MAX_PATH);
if(path.size() < MAX_PATH)
filePath[path.size()] = L'\0';
else
filePath[MAX_PATH - 1] = L'\0';
PathRemoveFileSpecW(filePath);
PathAppendW(filePath, value.c_str());
includePath = filePath;
}
else
includePath = value;
loadConfig(includePath, loadFilterCount, loadPreamp);
}
}
}
}
#define IS_DENORMAL(f) (((*(unsigned int *)&(f))&0x7f800000) == 0)
void ParametricEQ::process(float *output, float *input, unsigned frameCount)
{
bool inputSilent = true;
for (unsigned i = 0; i < frameCount * channelCount; i++)
{
if(input[i] != 0)
{
inputSilent = false;
break;
}
}
if(inputSilent)
{
if(lastInputWasSilent)
{
//Avoid processing cost if silence would be output anyway
if(input != output)
memset(output, 0, frameCount * channelCount * sizeof(float));
return;
}
else
lastInputWasSilent = true;
}
else
lastInputWasSilent = false;
//Avoid denormals
for(unsigned i = 0; i < (filterCount+1)*channelCount*2; i++)
if(IS_DENORMAL(sampleData[i]))
sampleData[i] = 0;
for (unsigned i = 0; i < frameCount * channelCount; i+=channelCount)
for (unsigned c=0; c<channelCount; c++)
{
float sample = input[i+c];
for(unsigned f=0; f<filterCount; f++)
{
unsigned dataIndex = (c*(filterCount+1) + f)*2;
float result = filters[f].a0 * sample + filters[f].a[0] * sampleData[dataIndex] + filters[f].a[1] * sampleData[dataIndex+1] +
filters[f].a[2] * sampleData[dataIndex+2] + filters[f].a[3] * sampleData[dataIndex+3];
sampleData[dataIndex+1] = sampleData[dataIndex];
sampleData[dataIndex] = sample;
//Input for next stage
sample = result;
}
unsigned lastIndex = (c*(filterCount+1) + filterCount)*2;
sampleData[lastIndex + 1] = sampleData[lastIndex];
sampleData[lastIndex] = sample;
output[i+c] = sample * preamp;
}
}
float ParametricEQ::getFreq(const wstring& freqString)
{
float result;
int matched = swscanf_s(freqString.c_str(), L"%f", &result);
if(matched == 1)
{
if(freqString.length() >= 5)
{
if(freqString[freqString.length() - 4] == L'.')
{
//Interpret as thousands separator because of Room EQ Wizard
result *= 1000.0f;
}
}
return result;
}
else
return -1.0f;
}
unsigned long __stdcall ParametricEQ::notificationThread(void* parameter)
{
ParametricEQ* peq = (ParametricEQ*)parameter;
HANDLE notificationHandle = FindFirstChangeNotificationW(peq->configPath.c_str(), true, FILE_NOTIFY_CHANGE_LAST_WRITE);
if(notificationHandle == INVALID_HANDLE_VALUE)
notificationHandle = NULL;
HANDLE handles[2] = {peq->shutdownEvent, notificationHandle};
while(true)
{
DWORD which = WaitForMultipleObjects(2, handles, false, INFINITE);
if(which == WAIT_OBJECT_0)
{
//Shutdown
break;
}
else
{
FindNextChangeNotification(notificationHandle);
//Wait for second event within 100 milliseconds to avoid loading twice
WaitForMultipleObjects(1, &notificationHandle, false, 100);
peq->loadConfig();
FindNextChangeNotification(notificationHandle);
}
}
FindCloseChangeNotification(notificationHandle);
return 0;
}
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