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.
112 lines
3.4 KiB
C++
112 lines
3.4 KiB
C++
/*
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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 <cmath>
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#include "helpers/MemoryHelper.h"
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#include "DelayFilter.h"
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using namespace std;
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DelayFilter::DelayFilter(double delay, bool isMs)
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:delay(delay), isMs(isMs)
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{
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buffers = NULL;
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}
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DelayFilter::~DelayFilter()
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{
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cleanup();
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}
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vector<wstring> DelayFilter::initialize(float sampleRate, unsigned maxFrameCount, vector<wstring> channelNames)
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{
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cleanup();
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channelCount = (unsigned)channelNames.size();
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if(isMs)
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bufferLength = (unsigned)(sampleRate * delay / 1000.0 + 0.5);
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else
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bufferLength = (unsigned)(delay + 0.5);
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buffers = (float**)MemoryHelper::alloc(sizeof(float*) * channelCount);
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for(unsigned i=0; i<channelCount; i++)
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{
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buffers[i] = (float*)MemoryHelper::alloc(sizeof(float) * bufferLength);
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memset(buffers[i], 0, sizeof(float) * bufferLength);
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}
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bufferOffset = 0;
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return channelNames;
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}
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#pragma AVRT_CODE_BEGIN
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void DelayFilter::process(float** output, float** input, unsigned frameCount)
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{
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for(unsigned i=0; i<channelCount; i++)
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{
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float* inputChannel = input[i];
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float* outputChannel = output[i];
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float* bufferChannel = buffers[i];
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if(bufferLength <= frameCount)
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{
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memcpy(outputChannel, bufferChannel + bufferOffset, (bufferLength - bufferOffset) * sizeof(float));
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memcpy(outputChannel + bufferLength - bufferOffset, bufferChannel, bufferOffset * sizeof(float));
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memcpy(outputChannel + bufferLength, inputChannel, (frameCount - bufferLength) * sizeof(float));
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memcpy(bufferChannel, inputChannel + frameCount - bufferLength, bufferLength * sizeof(float));
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}
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else
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{
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if(bufferLength < bufferOffset + frameCount)
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{
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memcpy(outputChannel, bufferChannel + bufferOffset, (bufferLength - bufferOffset) * sizeof(float));
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memcpy(outputChannel + bufferLength - bufferOffset, bufferChannel, (frameCount - (bufferLength - bufferOffset)) * sizeof(float));
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memcpy(bufferChannel + bufferOffset, inputChannel, (bufferLength - bufferOffset) * sizeof(float));
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memcpy(bufferChannel, inputChannel + bufferLength - bufferOffset, (frameCount - (bufferLength - bufferOffset)) * sizeof(float));
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}
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else
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{
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memcpy(outputChannel, bufferChannel + bufferOffset, frameCount * sizeof(float));
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memcpy(bufferChannel + bufferOffset, inputChannel, frameCount * sizeof(float));
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}
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}
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}
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if(bufferLength <= frameCount)
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bufferOffset = 0;
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else
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bufferOffset = (bufferOffset + frameCount) % bufferLength;
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}
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#pragma AVRT_CODE_END
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void DelayFilter::cleanup()
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{
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if(buffers != NULL)
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{
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for(unsigned i=0; i<channelCount; i++)
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MemoryHelper::free(buffers[i]);
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MemoryHelper::free(buffers);
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buffers = NULL;
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}
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} |