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338 lines
15 KiB
338 lines
15 KiB
/**
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* OpenAL cross platform audio library
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* Copyright (C) 2013 by Mike Gorchak
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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* Or go to http://www.gnu.org/copyleft/lgpl.html
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*/
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#include "config.h"
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#include <cmath>
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#include <cstdlib>
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#include <algorithm>
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#include <functional>
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#include "alMain.h"
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#include "alcontext.h"
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#include "alAuxEffectSlot.h"
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#include "alError.h"
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#include "alu.h"
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#include "filters/biquad.h"
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#include "vecmat.h"
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namespace {
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/* The document "Effects Extension Guide.pdf" says that low and high *
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* frequencies are cutoff frequencies. This is not fully correct, they *
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* are corner frequencies for low and high shelf filters. If they were *
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* just cutoff frequencies, there would be no need in cutoff frequency *
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* gains, which are present. Documentation for "Creative Proteus X2" *
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* software describes 4-band equalizer functionality in a much better *
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* way. This equalizer seems to be a predecessor of OpenAL 4-band *
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* equalizer. With low and high shelf filters we are able to cutoff *
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* frequencies below and/or above corner frequencies using attenuation *
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* gains (below 1.0) and amplify all low and/or high frequencies using *
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* gains above 1.0. *
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* *
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* Low-shelf Low Mid Band High Mid Band High-shelf *
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* corner center center corner *
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* frequency frequency frequency frequency *
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* 50Hz..800Hz 200Hz..3000Hz 1000Hz..8000Hz 4000Hz..16000Hz *
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* *
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* | | | | *
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* | | | | *
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* B -----+ /--+--\ /--+--\ +----- *
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* O |\ | | | | | | /| *
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* O | \ - | - - | - / | *
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* S + | \ | | | | | | / | *
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* T | | | | | | | | | | *
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* ---------+---------------+------------------+---------------+-------- *
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* C | | | | | | | | | | *
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* U - | / | | | | | | \ | *
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* T | / - | - - | - \ | *
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* O |/ | | | | | | \| *
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* F -----+ \--+--/ \--+--/ +----- *
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* F | | | | *
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* | | | | *
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* *
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* Gains vary from 0.126 up to 7.943, which means from -18dB attenuation *
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* up to +18dB amplification. Band width varies from 0.01 up to 1.0 in *
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* octaves for two mid bands. *
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* *
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* Implementation is based on the "Cookbook formulae for audio EQ biquad *
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* filter coefficients" by Robert Bristow-Johnson *
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* http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt */
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struct EqualizerState final : public EffectState {
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struct {
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/* Effect parameters */
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BiquadFilter filter[4];
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/* Effect gains for each channel */
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ALfloat CurrentGains[MAX_OUTPUT_CHANNELS]{};
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ALfloat TargetGains[MAX_OUTPUT_CHANNELS]{};
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} mChans[MAX_AMBI_CHANNELS];
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ALfloat mSampleBuffer[BUFFERSIZE]{};
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ALboolean deviceUpdate(const ALCdevice *device) override;
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void update(const ALCcontext *context, const ALeffectslot *slot, const EffectProps *props, const EffectTarget target) override;
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void process(ALsizei samplesToDo, const ALfloat (*RESTRICT samplesIn)[BUFFERSIZE], const ALsizei numInput, ALfloat (*RESTRICT samplesOut)[BUFFERSIZE], const ALsizei numOutput) override;
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DEF_NEWDEL(EqualizerState)
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};
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ALboolean EqualizerState::deviceUpdate(const ALCdevice *UNUSED(device))
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{
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for(auto &e : mChans)
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{
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std::for_each(std::begin(e.filter), std::end(e.filter),
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std::mem_fn(&BiquadFilter::clear));
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std::fill(std::begin(e.CurrentGains), std::end(e.CurrentGains), 0.0f);
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}
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return AL_TRUE;
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}
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void EqualizerState::update(const ALCcontext *context, const ALeffectslot *slot, const EffectProps *props, const EffectTarget target)
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{
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const ALCdevice *device = context->Device;
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auto frequency = static_cast<ALfloat>(device->Frequency);
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ALfloat gain, f0norm;
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/* Calculate coefficients for the each type of filter. Note that the shelf
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* filters' gain is for the reference frequency, which is the centerpoint
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* of the transition band.
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*/
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gain = maxf(sqrtf(props->Equalizer.LowGain), 0.0625f); /* Limit -24dB */
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f0norm = props->Equalizer.LowCutoff/frequency;
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mChans[0].filter[0].setParams(BiquadType::LowShelf, gain, f0norm,
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calc_rcpQ_from_slope(gain, 0.75f));
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gain = maxf(props->Equalizer.Mid1Gain, 0.0625f);
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f0norm = props->Equalizer.Mid1Center/frequency;
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mChans[0].filter[1].setParams(BiquadType::Peaking, gain, f0norm,
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calc_rcpQ_from_bandwidth(f0norm, props->Equalizer.Mid1Width));
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gain = maxf(props->Equalizer.Mid2Gain, 0.0625f);
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f0norm = props->Equalizer.Mid2Center/frequency;
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mChans[0].filter[2].setParams(BiquadType::Peaking, gain, f0norm,
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calc_rcpQ_from_bandwidth(f0norm, props->Equalizer.Mid2Width));
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gain = maxf(sqrtf(props->Equalizer.HighGain), 0.0625f);
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f0norm = props->Equalizer.HighCutoff/frequency;
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mChans[0].filter[3].setParams(BiquadType::HighShelf, gain, f0norm,
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calc_rcpQ_from_slope(gain, 0.75f));
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/* Copy the filter coefficients for the other input channels. */
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for(ALsizei i{1};i < slot->Wet.NumChannels;++i)
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{
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mChans[i].filter[0].copyParamsFrom(mChans[0].filter[0]);
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mChans[i].filter[1].copyParamsFrom(mChans[0].filter[1]);
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mChans[i].filter[2].copyParamsFrom(mChans[0].filter[2]);
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mChans[i].filter[3].copyParamsFrom(mChans[0].filter[3]);
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}
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mOutBuffer = target.Main->Buffer;
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mOutChannels = target.Main->NumChannels;
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for(ALsizei i{0};i < slot->Wet.NumChannels;++i)
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{
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auto coeffs = GetAmbiIdentityRow(i);
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ComputePanGains(target.Main, coeffs.data(), slot->Params.Gain, mChans[i].TargetGains);
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}
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}
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void EqualizerState::process(ALsizei samplesToDo, const ALfloat (*RESTRICT samplesIn)[BUFFERSIZE], const ALsizei numInput, ALfloat (*RESTRICT samplesOut)[BUFFERSIZE], const ALsizei numOutput)
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{
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ASSUME(numInput > 0);
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for(ALsizei c{0};c < numInput;c++)
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{
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mChans[c].filter[0].process(mSampleBuffer, samplesIn[c], samplesToDo);
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mChans[c].filter[1].process(mSampleBuffer, mSampleBuffer, samplesToDo);
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mChans[c].filter[2].process(mSampleBuffer, mSampleBuffer, samplesToDo);
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mChans[c].filter[3].process(mSampleBuffer, mSampleBuffer, samplesToDo);
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MixSamples(mSampleBuffer, numOutput, samplesOut, mChans[c].CurrentGains,
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mChans[c].TargetGains, samplesToDo, 0, samplesToDo);
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}
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}
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void Equalizer_setParami(EffectProps*, ALCcontext *context, ALenum param, ALint)
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{ alSetError(context, AL_INVALID_ENUM, "Invalid equalizer integer property 0x%04x", param); }
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void Equalizer_setParamiv(EffectProps*, ALCcontext *context, ALenum param, const ALint*)
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{ alSetError(context, AL_INVALID_ENUM, "Invalid equalizer integer-vector property 0x%04x", param); }
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void Equalizer_setParamf(EffectProps *props, ALCcontext *context, ALenum param, ALfloat val)
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{
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switch(param)
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{
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case AL_EQUALIZER_LOW_GAIN:
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if(!(val >= AL_EQUALIZER_MIN_LOW_GAIN && val <= AL_EQUALIZER_MAX_LOW_GAIN))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer low-band gain out of range");
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props->Equalizer.LowGain = val;
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break;
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case AL_EQUALIZER_LOW_CUTOFF:
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if(!(val >= AL_EQUALIZER_MIN_LOW_CUTOFF && val <= AL_EQUALIZER_MAX_LOW_CUTOFF))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer low-band cutoff out of range");
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props->Equalizer.LowCutoff = val;
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break;
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case AL_EQUALIZER_MID1_GAIN:
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if(!(val >= AL_EQUALIZER_MIN_MID1_GAIN && val <= AL_EQUALIZER_MAX_MID1_GAIN))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer mid1-band gain out of range");
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props->Equalizer.Mid1Gain = val;
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break;
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case AL_EQUALIZER_MID1_CENTER:
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if(!(val >= AL_EQUALIZER_MIN_MID1_CENTER && val <= AL_EQUALIZER_MAX_MID1_CENTER))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer mid1-band center out of range");
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props->Equalizer.Mid1Center = val;
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break;
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case AL_EQUALIZER_MID1_WIDTH:
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if(!(val >= AL_EQUALIZER_MIN_MID1_WIDTH && val <= AL_EQUALIZER_MAX_MID1_WIDTH))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer mid1-band width out of range");
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props->Equalizer.Mid1Width = val;
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break;
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case AL_EQUALIZER_MID2_GAIN:
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if(!(val >= AL_EQUALIZER_MIN_MID2_GAIN && val <= AL_EQUALIZER_MAX_MID2_GAIN))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer mid2-band gain out of range");
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props->Equalizer.Mid2Gain = val;
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break;
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case AL_EQUALIZER_MID2_CENTER:
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if(!(val >= AL_EQUALIZER_MIN_MID2_CENTER && val <= AL_EQUALIZER_MAX_MID2_CENTER))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer mid2-band center out of range");
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props->Equalizer.Mid2Center = val;
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break;
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case AL_EQUALIZER_MID2_WIDTH:
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if(!(val >= AL_EQUALIZER_MIN_MID2_WIDTH && val <= AL_EQUALIZER_MAX_MID2_WIDTH))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer mid2-band width out of range");
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props->Equalizer.Mid2Width = val;
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break;
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case AL_EQUALIZER_HIGH_GAIN:
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if(!(val >= AL_EQUALIZER_MIN_HIGH_GAIN && val <= AL_EQUALIZER_MAX_HIGH_GAIN))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer high-band gain out of range");
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props->Equalizer.HighGain = val;
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break;
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case AL_EQUALIZER_HIGH_CUTOFF:
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if(!(val >= AL_EQUALIZER_MIN_HIGH_CUTOFF && val <= AL_EQUALIZER_MAX_HIGH_CUTOFF))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer high-band cutoff out of range");
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props->Equalizer.HighCutoff = val;
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break;
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default:
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alSetError(context, AL_INVALID_ENUM, "Invalid equalizer float property 0x%04x", param);
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}
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}
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void Equalizer_setParamfv(EffectProps *props, ALCcontext *context, ALenum param, const ALfloat *vals)
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{ Equalizer_setParamf(props, context, param, vals[0]); }
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void Equalizer_getParami(const EffectProps*, ALCcontext *context, ALenum param, ALint*)
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{ alSetError(context, AL_INVALID_ENUM, "Invalid equalizer integer property 0x%04x", param); }
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void Equalizer_getParamiv(const EffectProps*, ALCcontext *context, ALenum param, ALint*)
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{ alSetError(context, AL_INVALID_ENUM, "Invalid equalizer integer-vector property 0x%04x", param); }
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void Equalizer_getParamf(const EffectProps *props, ALCcontext *context, ALenum param, ALfloat *val)
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{
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switch(param)
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{
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case AL_EQUALIZER_LOW_GAIN:
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*val = props->Equalizer.LowGain;
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break;
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case AL_EQUALIZER_LOW_CUTOFF:
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*val = props->Equalizer.LowCutoff;
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break;
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case AL_EQUALIZER_MID1_GAIN:
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*val = props->Equalizer.Mid1Gain;
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break;
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case AL_EQUALIZER_MID1_CENTER:
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*val = props->Equalizer.Mid1Center;
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break;
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case AL_EQUALIZER_MID1_WIDTH:
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*val = props->Equalizer.Mid1Width;
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break;
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case AL_EQUALIZER_MID2_GAIN:
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*val = props->Equalizer.Mid2Gain;
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break;
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case AL_EQUALIZER_MID2_CENTER:
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*val = props->Equalizer.Mid2Center;
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break;
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case AL_EQUALIZER_MID2_WIDTH:
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*val = props->Equalizer.Mid2Width;
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break;
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case AL_EQUALIZER_HIGH_GAIN:
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*val = props->Equalizer.HighGain;
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break;
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case AL_EQUALIZER_HIGH_CUTOFF:
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*val = props->Equalizer.HighCutoff;
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break;
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default:
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alSetError(context, AL_INVALID_ENUM, "Invalid equalizer float property 0x%04x", param);
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}
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}
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void Equalizer_getParamfv(const EffectProps *props, ALCcontext *context, ALenum param, ALfloat *vals)
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{ Equalizer_getParamf(props, context, param, vals); }
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DEFINE_ALEFFECT_VTABLE(Equalizer);
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struct EqualizerStateFactory final : public EffectStateFactory {
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EffectState *create() override { return new EqualizerState{}; }
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EffectProps getDefaultProps() const noexcept override;
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const EffectVtable *getEffectVtable() const noexcept override { return &Equalizer_vtable; }
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};
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EffectProps EqualizerStateFactory::getDefaultProps() const noexcept
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{
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EffectProps props{};
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props.Equalizer.LowCutoff = AL_EQUALIZER_DEFAULT_LOW_CUTOFF;
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props.Equalizer.LowGain = AL_EQUALIZER_DEFAULT_LOW_GAIN;
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props.Equalizer.Mid1Center = AL_EQUALIZER_DEFAULT_MID1_CENTER;
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props.Equalizer.Mid1Gain = AL_EQUALIZER_DEFAULT_MID1_GAIN;
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props.Equalizer.Mid1Width = AL_EQUALIZER_DEFAULT_MID1_WIDTH;
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props.Equalizer.Mid2Center = AL_EQUALIZER_DEFAULT_MID2_CENTER;
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props.Equalizer.Mid2Gain = AL_EQUALIZER_DEFAULT_MID2_GAIN;
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props.Equalizer.Mid2Width = AL_EQUALIZER_DEFAULT_MID2_WIDTH;
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props.Equalizer.HighCutoff = AL_EQUALIZER_DEFAULT_HIGH_CUTOFF;
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props.Equalizer.HighGain = AL_EQUALIZER_DEFAULT_HIGH_GAIN;
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return props;
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}
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} // namespace
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EffectStateFactory *EqualizerStateFactory_getFactory()
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{
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static EqualizerStateFactory EqualizerFactory{};
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return &EqualizerFactory;
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}
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