Version 0.9
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.
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/*
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This file is part of EqualizerAPO, a system-wide equalizer.
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Copyright (C) 2014 Jonas Thedering
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <algorithm>
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#include <sstream>
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#include "helpers/LogHelper.h"
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#include "helpers/MemoryHelper.h"
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#include "CopyFilter.h"
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using namespace std;
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CopyFilter::CopyFilter(const vector<Assignment>& assignments)
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{
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this->assignments = assignments;
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internalAssignments = NULL;
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assignmentCount = 0;
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}
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CopyFilter::~CopyFilter()
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{
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cleanup();
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}
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vector<wstring> CopyFilter::initialize(float sampleRate, unsigned maxFrameCount, vector<wstring> channelNames)
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{
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cleanup();
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assignmentCount = (unsigned)assignments.size();
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internalAssignments = (InternalAssignment*)MemoryHelper::alloc(assignmentCount * sizeof(Assignment));
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vector<wstring> outChannelNames;
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for(unsigned i=0; i<assignmentCount; i++)
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{
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InternalAssignment& ia = internalAssignments[i];
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Assignment& a = assignments[i];
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wstring channelName = a.targetChannel;
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int channelIndex = getChannelIndex(a.targetChannel, channelNames, true);
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if(channelIndex != -1)
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channelName = channelNames[channelIndex];
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vector<wstring>::const_iterator it = find(outChannelNames.begin(), outChannelNames.end(), channelName);
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ia.targetChannel = (int)(it-outChannelNames.begin());
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if(it == outChannelNames.end())
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outChannelNames.push_back(channelName);
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ia.sourceCount = (unsigned)a.sourceSum.size();
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ia.sourceSum = (InternalAssignment::InternalSummand*)MemoryHelper::alloc(ia.sourceCount * sizeof(InternalAssignment::InternalSummand));
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for(unsigned j=0; j<ia.sourceCount; j++)
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{
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InternalAssignment::InternalSummand& is = ia.sourceSum[j];
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Assignment::Summand& s = a.sourceSum[j];
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if(s.channel != L"")
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is.channel = getChannelIndex(s.channel, channelNames);
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else
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is.channel = -1;
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if(s.isDecibel)
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is.factor = (float)pow(10.0, s.factor / 20.0);
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else
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is.factor = (float)s.factor;
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}
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}
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wstringstream stream;
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stream << "Copying ";
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for(unsigned i=0; i<assignmentCount; i++)
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{
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InternalAssignment& ia = internalAssignments[i];
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if(i > 0)
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stream << ", ";
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stream << L"to channel " << outChannelNames[ia.targetChannel].c_str() << " ";
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for(unsigned j=0; j<ia.sourceCount; j++)
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{
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InternalAssignment::InternalSummand& is = ia.sourceSum[j];
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if(j > 0)
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stream << ", ";
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if(is.channel != -1)
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stream << L"from channel " << channelNames[is.channel].c_str() << L" with factor " << is.factor;
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else
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stream << L"value " << is.factor;
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}
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}
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TraceF(L"%s", stream.str().c_str());
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return outChannelNames;
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}
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#pragma AVRT_CODE_BEGIN
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void CopyFilter::process(float** output, float** input, unsigned frameCount)
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{
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for(unsigned i=0; i<assignmentCount; i++)
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{
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InternalAssignment& ia = internalAssignments[i];
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if(ia.targetChannel == -1 || ia.sourceCount == 0)
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continue;
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{
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InternalAssignment::InternalSummand& is = ia.sourceSum[0];
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if(is.channel == -1)
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for(unsigned f=0; f<frameCount; f++)
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output[ia.targetChannel][f] = is.factor;
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else if(is.factor == 1.0)
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memcpy(output[ia.targetChannel], input[is.channel], frameCount * sizeof(float));
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else
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for(unsigned f=0; f<frameCount; f++)
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output[ia.targetChannel][f] = is.factor * input[is.channel][f];
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}
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for(unsigned j=1; j<ia.sourceCount; j++)
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{
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InternalAssignment::InternalSummand& is = ia.sourceSum[j];
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if(is.channel == -1)
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for(unsigned f=0; f<frameCount; f++)
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output[ia.targetChannel][f] += is.factor;
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else if(is.factor == 1.0)
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for(unsigned f=0; f<frameCount; f++)
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output[ia.targetChannel][f] += input[is.channel][f];
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else
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for(unsigned f=0; f<frameCount; f++)
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output[ia.targetChannel][f] += is.factor * input[is.channel][f];
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}
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}
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}
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#pragma AVRT_CODE_END
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void CopyFilter::cleanup()
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{
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if(internalAssignments != NULL)
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{
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for(unsigned i=0; i<assignmentCount; i++)
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{
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InternalAssignment& ia = internalAssignments[i];
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if(ia.sourceSum != NULL)
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{
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MemoryHelper::free(ia.sourceSum);
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ia.sourceSum = NULL;
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}
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}
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MemoryHelper::free(internalAssignments);
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internalAssignments = NULL;
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}
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}
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