mirror of
https://github.com/TorqueGameEngines/Torque3D.git
synced 2026-03-04 13:00:33 +00:00
a745fc3757
added libraries: opus flac libsndfile updated: libvorbis libogg openal - Everything works as expected for now. Bare in mind libsndfile needed the check for whether or not it could find the xiph libraries removed in order for this to work.
204 lines
8.6 KiB
C++
204 lines
8.6 KiB
C++
/**
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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 <algorithm>
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#include <array>
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#include <cstdlib>
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#include <functional>
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#include <iterator>
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#include <utility>
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#include "alc/effects/base.h"
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#include "almalloc.h"
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#include "alspan.h"
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#include "core/ambidefs.h"
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#include "core/bufferline.h"
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#include "core/context.h"
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#include "core/devformat.h"
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#include "core/device.h"
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#include "core/effectslot.h"
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#include "core/filters/biquad.h"
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#include "core/mixer.h"
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#include "intrusive_ptr.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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uint mTargetChannel{InvalidChannelIndex};
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/* Effect parameters */
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BiquadFilter mFilter[4];
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/* Effect gains for each channel */
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float mCurrentGain{};
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float mTargetGain{};
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} mChans[MaxAmbiChannels];
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alignas(16) FloatBufferLine mSampleBuffer{};
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void deviceUpdate(const DeviceBase *device, const BufferStorage *buffer) override;
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void update(const ContextBase *context, const EffectSlot *slot, const EffectProps *props,
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const EffectTarget target) override;
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void process(const size_t samplesToDo, const al::span<const FloatBufferLine> samplesIn,
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const al::span<FloatBufferLine> samplesOut) override;
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DEF_NEWDEL(EqualizerState)
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};
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void EqualizerState::deviceUpdate(const DeviceBase*, const BufferStorage*)
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{
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for(auto &e : mChans)
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{
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e.mTargetChannel = InvalidChannelIndex;
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std::for_each(std::begin(e.mFilter), std::end(e.mFilter),
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std::mem_fn(&BiquadFilter::clear));
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e.mCurrentGain = 0.0f;
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}
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}
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void EqualizerState::update(const ContextBase *context, const EffectSlot *slot,
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const EffectProps *props, const EffectTarget target)
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{
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const DeviceBase *device{context->mDevice};
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auto frequency = static_cast<float>(device->Frequency);
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float gain, f0norm;
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/* Calculate coefficients for the each type of filter. Note that the shelf
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* and peaking filters' gain is for the centerpoint of the transition band,
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* while the effect property gains are for the shelf/peak itself. So the
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* property gains need their dB halved (sqrt of linear gain) for the
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* shelf/peak to reach the provided gain.
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*/
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gain = std::sqrt(props->Equalizer.LowGain);
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f0norm = props->Equalizer.LowCutoff / frequency;
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mChans[0].mFilter[0].setParamsFromSlope(BiquadType::LowShelf, f0norm, gain, 0.75f);
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gain = std::sqrt(props->Equalizer.Mid1Gain);
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f0norm = props->Equalizer.Mid1Center / frequency;
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mChans[0].mFilter[1].setParamsFromBandwidth(BiquadType::Peaking, f0norm, gain,
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props->Equalizer.Mid1Width);
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gain = std::sqrt(props->Equalizer.Mid2Gain);
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f0norm = props->Equalizer.Mid2Center / frequency;
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mChans[0].mFilter[2].setParamsFromBandwidth(BiquadType::Peaking, f0norm, gain,
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props->Equalizer.Mid2Width);
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gain = std::sqrt(props->Equalizer.HighGain);
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f0norm = props->Equalizer.HighCutoff / frequency;
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mChans[0].mFilter[3].setParamsFromSlope(BiquadType::HighShelf, f0norm, gain, 0.75f);
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/* Copy the filter coefficients for the other input channels. */
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for(size_t i{1u};i < slot->Wet.Buffer.size();++i)
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{
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mChans[i].mFilter[0].copyParamsFrom(mChans[0].mFilter[0]);
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mChans[i].mFilter[1].copyParamsFrom(mChans[0].mFilter[1]);
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mChans[i].mFilter[2].copyParamsFrom(mChans[0].mFilter[2]);
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mChans[i].mFilter[3].copyParamsFrom(mChans[0].mFilter[3]);
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}
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mOutTarget = target.Main->Buffer;
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auto set_channel = [this](size_t idx, uint outchan, float outgain)
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{
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mChans[idx].mTargetChannel = outchan;
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mChans[idx].mTargetGain = outgain;
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};
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target.Main->setAmbiMixParams(slot->Wet, slot->Gain, set_channel);
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}
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void EqualizerState::process(const size_t samplesToDo, const al::span<const FloatBufferLine> samplesIn, const al::span<FloatBufferLine> samplesOut)
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{
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const al::span<float> buffer{mSampleBuffer.data(), samplesToDo};
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auto chan = std::begin(mChans);
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for(const auto &input : samplesIn)
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{
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const size_t outidx{chan->mTargetChannel};
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if(outidx != InvalidChannelIndex)
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{
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const al::span<const float> inbuf{input.data(), samplesToDo};
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DualBiquad{chan->mFilter[0], chan->mFilter[1]}.process(inbuf, buffer.begin());
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DualBiquad{chan->mFilter[2], chan->mFilter[3]}.process(buffer, buffer.begin());
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MixSamples(buffer, samplesOut[outidx].data(), chan->mCurrentGain, chan->mTargetGain,
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samplesToDo);
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}
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++chan;
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}
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}
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struct EqualizerStateFactory final : public EffectStateFactory {
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al::intrusive_ptr<EffectState> create() override
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{ return al::intrusive_ptr<EffectState>{new EqualizerState{}}; }
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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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