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.
74 lines
1.8 KiB
C++
74 lines
1.8 KiB
C++
/*
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This file is part of EqualizerAPO, a system-wide equalizer.
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Copyright (C) 2013 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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#pragma once
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#include <string>
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#define IS_DENORMAL(f) (((*(unsigned int *)&(f))&0x7f800000) == 0)
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class BiQuad
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{
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public:
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enum Type
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{
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LOW_PASS, HIGH_PASS, BAND_PASS, NOTCH, ALL_PASS, PEAKING, LOW_SHELF, HIGH_SHELF
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};
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BiQuad() {}
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BiQuad(Type type, double dbGain, double freq, double srate, double bandwidthOrQOrS, bool isBandwidth);
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__forceinline
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void removeDenormals()
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{
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if(IS_DENORMAL(x1))
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x1 = 0.0f;
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if(IS_DENORMAL(x2))
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x2 = 0.0f;
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if(IS_DENORMAL(y1))
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y1 = 0.0f;
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if(IS_DENORMAL(y2))
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y2 = 0.0f;
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}
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__forceinline
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float process(float sample)
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{
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// changed order of additions leads to better pipelining
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float result = a0 * sample + a[1] * x2 + a[0] * x1 - a[3] * y2 - a[2] * y1;
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x2 = x1;
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x1 = sample;
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y2 = y1;
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y1 = result;
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return result;
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}
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float gainAt(float freq, float srate);
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private:
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__declspec(align(16)) float a[4];
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float a0;
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float x1, x2;
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float y1, y2;
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};
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