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521 lines
18 KiB
521 lines
18 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 <cstdlib>
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#include <cmath>
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#include <algorithm>
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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 "vector.h"
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namespace {
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static_assert(AL_CHORUS_WAVEFORM_SINUSOID == AL_FLANGER_WAVEFORM_SINUSOID, "Chorus/Flanger waveform value mismatch");
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static_assert(AL_CHORUS_WAVEFORM_TRIANGLE == AL_FLANGER_WAVEFORM_TRIANGLE, "Chorus/Flanger waveform value mismatch");
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enum class WaveForm {
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Sinusoid,
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Triangle
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};
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void GetTriangleDelays(ALint *delays, ALsizei offset, ALsizei lfo_range, ALfloat lfo_scale,
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ALfloat depth, ALsizei delay, ALsizei todo)
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{
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std::generate_n<ALint*RESTRICT>(delays, todo,
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[&offset,lfo_range,lfo_scale,depth,delay]() -> ALint
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{
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offset = (offset+1)%lfo_range;
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return fastf2i((1.0f - std::abs(2.0f - lfo_scale*offset)) * depth) + delay;
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}
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);
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}
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void GetSinusoidDelays(ALint *delays, ALsizei offset, ALsizei lfo_range, ALfloat lfo_scale,
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ALfloat depth, ALsizei delay, ALsizei todo)
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{
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std::generate_n<ALint*RESTRICT>(delays, todo,
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[&offset,lfo_range,lfo_scale,depth,delay]() -> ALint
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{
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offset = (offset+1)%lfo_range;
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return fastf2i(std::sin(lfo_scale*offset) * depth) + delay;
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}
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);
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}
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struct ChorusState final : public EffectState {
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al::vector<ALfloat,16> mSampleBuffer;
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ALsizei mOffset{0};
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ALsizei mLfoOffset{0};
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ALsizei mLfoRange{1};
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ALfloat mLfoScale{0.0f};
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ALint mLfoDisp{0};
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/* Gains for left and right sides */
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struct {
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ALfloat Current[MAX_OUTPUT_CHANNELS]{};
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ALfloat Target[MAX_OUTPUT_CHANNELS]{};
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} mGains[2];
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/* effect parameters */
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WaveForm mWaveform{};
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ALint mDelay{0};
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ALfloat mDepth{0.0f};
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ALfloat mFeedback{0.0f};
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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(ChorusState)
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};
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ALboolean ChorusState::deviceUpdate(const ALCdevice *Device)
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{
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const ALfloat max_delay = maxf(AL_CHORUS_MAX_DELAY, AL_FLANGER_MAX_DELAY);
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size_t maxlen;
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maxlen = NextPowerOf2(float2int(max_delay*2.0f*Device->Frequency) + 1u);
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if(maxlen <= 0) return AL_FALSE;
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if(maxlen != mSampleBuffer.size())
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{
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mSampleBuffer.resize(maxlen);
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mSampleBuffer.shrink_to_fit();
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}
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std::fill(mSampleBuffer.begin(), mSampleBuffer.end(), 0.0f);
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for(auto &e : mGains)
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{
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std::fill(std::begin(e.Current), std::end(e.Current), 0.0f);
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std::fill(std::begin(e.Target), std::end(e.Target), 0.0f);
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}
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return AL_TRUE;
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}
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void ChorusState::update(const ALCcontext *Context, const ALeffectslot *Slot, const EffectProps *props, const EffectTarget target)
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{
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static constexpr ALsizei mindelay = MAX_RESAMPLE_PADDING << FRACTIONBITS;
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switch(props->Chorus.Waveform)
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{
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case AL_CHORUS_WAVEFORM_TRIANGLE:
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mWaveform = WaveForm::Triangle;
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break;
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case AL_CHORUS_WAVEFORM_SINUSOID:
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mWaveform = WaveForm::Sinusoid;
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break;
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}
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/* The LFO depth is scaled to be relative to the sample delay. Clamp the
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* delay and depth to allow enough padding for resampling.
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*/
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const ALCdevice *device{Context->Device};
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const auto frequency = static_cast<ALfloat>(device->Frequency);
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mDelay = maxi(float2int(props->Chorus.Delay*frequency*FRACTIONONE + 0.5f), mindelay);
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mDepth = minf(props->Chorus.Depth * mDelay, static_cast<ALfloat>(mDelay - mindelay));
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mFeedback = props->Chorus.Feedback;
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/* Gains for left and right sides */
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ALfloat coeffs[2][MAX_AMBI_CHANNELS];
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CalcDirectionCoeffs({-1.0f, 0.0f, 0.0f}, 0.0f, coeffs[0]);
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CalcDirectionCoeffs({ 1.0f, 0.0f, 0.0f}, 0.0f, coeffs[1]);
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mOutBuffer = target.Main->Buffer;
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mOutChannels = target.Main->NumChannels;
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ComputePanGains(target.Main, coeffs[0], Slot->Params.Gain, mGains[0].Target);
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ComputePanGains(target.Main, coeffs[1], Slot->Params.Gain, mGains[1].Target);
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ALfloat rate{props->Chorus.Rate};
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if(!(rate > 0.0f))
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{
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mLfoOffset = 0;
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mLfoRange = 1;
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mLfoScale = 0.0f;
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mLfoDisp = 0;
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}
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else
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{
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/* Calculate LFO coefficient (number of samples per cycle). Limit the
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* max range to avoid overflow when calculating the displacement.
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*/
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ALsizei lfo_range = float2int(minf(frequency/rate + 0.5f, static_cast<ALfloat>(INT_MAX/360 - 180)));
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mLfoOffset = float2int(static_cast<ALfloat>(mLfoOffset)/mLfoRange*lfo_range + 0.5f) % lfo_range;
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mLfoRange = lfo_range;
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switch(mWaveform)
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{
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case WaveForm::Triangle:
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mLfoScale = 4.0f / mLfoRange;
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break;
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case WaveForm::Sinusoid:
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mLfoScale = al::MathDefs<float>::Tau() / mLfoRange;
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break;
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}
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/* Calculate lfo phase displacement */
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ALint phase{props->Chorus.Phase};
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if(phase < 0) phase = 360 + phase;
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mLfoDisp = (mLfoRange*phase + 180) / 360;
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}
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}
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void ChorusState::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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const auto bufmask = static_cast<ALsizei>(mSampleBuffer.size()-1);
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const ALfloat feedback{mFeedback};
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const ALsizei avgdelay{(mDelay + (FRACTIONONE>>1)) >> FRACTIONBITS};
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ALfloat *RESTRICT delaybuf{mSampleBuffer.data()};
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ALsizei offset{mOffset};
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ALsizei i, c;
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ALsizei base;
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for(base = 0;base < samplesToDo;)
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{
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const ALsizei todo = mini(256, samplesToDo-base);
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ALint moddelays[2][256];
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alignas(16) ALfloat temps[2][256];
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if(mWaveform == WaveForm::Sinusoid)
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{
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GetSinusoidDelays(moddelays[0], mLfoOffset, mLfoRange, mLfoScale, mDepth, mDelay,
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todo);
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GetSinusoidDelays(moddelays[1], (mLfoOffset+mLfoDisp)%mLfoRange, mLfoRange, mLfoScale,
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mDepth, mDelay, todo);
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}
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else /*if(mWaveform == WaveForm::Triangle)*/
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{
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GetTriangleDelays(moddelays[0], mLfoOffset, mLfoRange, mLfoScale, mDepth, mDelay,
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todo);
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GetTriangleDelays(moddelays[1], (mLfoOffset+mLfoDisp)%mLfoRange, mLfoRange, mLfoScale,
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mDepth, mDelay, todo);
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}
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mLfoOffset = (mLfoOffset+todo) % mLfoRange;
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for(i = 0;i < todo;i++)
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{
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// Feed the buffer's input first (necessary for delays < 1).
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delaybuf[offset&bufmask] = samplesIn[0][base+i];
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// Tap for the left output.
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ALint delay{offset - (moddelays[0][i]>>FRACTIONBITS)};
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ALfloat mu{(moddelays[0][i]&FRACTIONMASK) * (1.0f/FRACTIONONE)};
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temps[0][i] = cubic(delaybuf[(delay+1) & bufmask], delaybuf[(delay ) & bufmask],
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delaybuf[(delay-1) & bufmask], delaybuf[(delay-2) & bufmask],
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mu);
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// Tap for the right output.
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delay = offset - (moddelays[1][i]>>FRACTIONBITS);
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mu = (moddelays[1][i]&FRACTIONMASK) * (1.0f/FRACTIONONE);
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temps[1][i] = cubic(delaybuf[(delay+1) & bufmask], delaybuf[(delay ) & bufmask],
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delaybuf[(delay-1) & bufmask], delaybuf[(delay-2) & bufmask],
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mu);
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// Accumulate feedback from the average delay of the taps.
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delaybuf[offset&bufmask] += delaybuf[(offset-avgdelay) & bufmask] * feedback;
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offset++;
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}
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for(c = 0;c < 2;c++)
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MixSamples(temps[c], numOutput, samplesOut, mGains[c].Current, mGains[c].Target,
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samplesToDo-base, base, todo);
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base += todo;
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}
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mOffset = offset;
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}
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void Chorus_setParami(EffectProps *props, ALCcontext *context, ALenum param, ALint val)
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{
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switch(param)
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{
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case AL_CHORUS_WAVEFORM:
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if(!(val >= AL_CHORUS_MIN_WAVEFORM && val <= AL_CHORUS_MAX_WAVEFORM))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Invalid chorus waveform");
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props->Chorus.Waveform = val;
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break;
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case AL_CHORUS_PHASE:
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if(!(val >= AL_CHORUS_MIN_PHASE && val <= AL_CHORUS_MAX_PHASE))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Chorus phase out of range");
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props->Chorus.Phase = val;
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break;
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default:
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alSetError(context, AL_INVALID_ENUM, "Invalid chorus integer property 0x%04x", param);
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}
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}
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void Chorus_setParamiv(EffectProps *props, ALCcontext *context, ALenum param, const ALint *vals)
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{ Chorus_setParami(props, context, param, vals[0]); }
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void Chorus_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_CHORUS_RATE:
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if(!(val >= AL_CHORUS_MIN_RATE && val <= AL_CHORUS_MAX_RATE))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Chorus rate out of range");
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props->Chorus.Rate = val;
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break;
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case AL_CHORUS_DEPTH:
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if(!(val >= AL_CHORUS_MIN_DEPTH && val <= AL_CHORUS_MAX_DEPTH))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Chorus depth out of range");
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props->Chorus.Depth = val;
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break;
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case AL_CHORUS_FEEDBACK:
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if(!(val >= AL_CHORUS_MIN_FEEDBACK && val <= AL_CHORUS_MAX_FEEDBACK))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Chorus feedback out of range");
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props->Chorus.Feedback = val;
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break;
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case AL_CHORUS_DELAY:
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if(!(val >= AL_CHORUS_MIN_DELAY && val <= AL_CHORUS_MAX_DELAY))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Chorus delay out of range");
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props->Chorus.Delay = val;
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break;
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default:
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alSetError(context, AL_INVALID_ENUM, "Invalid chorus float property 0x%04x", param);
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}
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}
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void Chorus_setParamfv(EffectProps *props, ALCcontext *context, ALenum param, const ALfloat *vals)
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{ Chorus_setParamf(props, context, param, vals[0]); }
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void Chorus_getParami(const EffectProps *props, ALCcontext *context, ALenum param, ALint *val)
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{
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switch(param)
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{
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case AL_CHORUS_WAVEFORM:
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*val = props->Chorus.Waveform;
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break;
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case AL_CHORUS_PHASE:
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*val = props->Chorus.Phase;
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break;
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default:
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alSetError(context, AL_INVALID_ENUM, "Invalid chorus integer property 0x%04x", param);
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}
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}
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void Chorus_getParamiv(const EffectProps *props, ALCcontext *context, ALenum param, ALint *vals)
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{ Chorus_getParami(props, context, param, vals); }
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void Chorus_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_CHORUS_RATE:
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*val = props->Chorus.Rate;
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break;
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case AL_CHORUS_DEPTH:
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*val = props->Chorus.Depth;
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break;
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case AL_CHORUS_FEEDBACK:
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*val = props->Chorus.Feedback;
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break;
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case AL_CHORUS_DELAY:
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*val = props->Chorus.Delay;
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break;
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default:
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alSetError(context, AL_INVALID_ENUM, "Invalid chorus float property 0x%04x", param);
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}
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}
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void Chorus_getParamfv(const EffectProps *props, ALCcontext *context, ALenum param, ALfloat *vals)
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{ Chorus_getParamf(props, context, param, vals); }
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DEFINE_ALEFFECT_VTABLE(Chorus);
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struct ChorusStateFactory final : public EffectStateFactory {
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EffectState *create() override { return new ChorusState{}; }
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EffectProps getDefaultProps() const noexcept override;
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const EffectVtable *getEffectVtable() const noexcept override { return &Chorus_vtable; }
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};
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EffectProps ChorusStateFactory::getDefaultProps() const noexcept
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{
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EffectProps props{};
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props.Chorus.Waveform = AL_CHORUS_DEFAULT_WAVEFORM;
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props.Chorus.Phase = AL_CHORUS_DEFAULT_PHASE;
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props.Chorus.Rate = AL_CHORUS_DEFAULT_RATE;
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props.Chorus.Depth = AL_CHORUS_DEFAULT_DEPTH;
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props.Chorus.Feedback = AL_CHORUS_DEFAULT_FEEDBACK;
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props.Chorus.Delay = AL_CHORUS_DEFAULT_DELAY;
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return props;
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}
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void Flanger_setParami(EffectProps *props, ALCcontext *context, ALenum param, ALint val)
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{
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switch(param)
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{
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case AL_FLANGER_WAVEFORM:
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if(!(val >= AL_FLANGER_MIN_WAVEFORM && val <= AL_FLANGER_MAX_WAVEFORM))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Invalid flanger waveform");
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props->Chorus.Waveform = val;
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break;
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case AL_FLANGER_PHASE:
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if(!(val >= AL_FLANGER_MIN_PHASE && val <= AL_FLANGER_MAX_PHASE))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Flanger phase out of range");
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props->Chorus.Phase = val;
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break;
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default:
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alSetError(context, AL_INVALID_ENUM, "Invalid flanger integer property 0x%04x", param);
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}
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}
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void Flanger_setParamiv(EffectProps *props, ALCcontext *context, ALenum param, const ALint *vals)
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{ Flanger_setParami(props, context, param, vals[0]); }
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void Flanger_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_FLANGER_RATE:
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if(!(val >= AL_FLANGER_MIN_RATE && val <= AL_FLANGER_MAX_RATE))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Flanger rate out of range");
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props->Chorus.Rate = val;
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break;
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case AL_FLANGER_DEPTH:
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if(!(val >= AL_FLANGER_MIN_DEPTH && val <= AL_FLANGER_MAX_DEPTH))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Flanger depth out of range");
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props->Chorus.Depth = val;
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break;
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case AL_FLANGER_FEEDBACK:
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if(!(val >= AL_FLANGER_MIN_FEEDBACK && val <= AL_FLANGER_MAX_FEEDBACK))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Flanger feedback out of range");
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props->Chorus.Feedback = val;
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break;
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case AL_FLANGER_DELAY:
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if(!(val >= AL_FLANGER_MIN_DELAY && val <= AL_FLANGER_MAX_DELAY))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Flanger delay out of range");
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props->Chorus.Delay = val;
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break;
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default:
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alSetError(context, AL_INVALID_ENUM, "Invalid flanger float property 0x%04x", param);
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}
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}
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void Flanger_setParamfv(EffectProps *props, ALCcontext *context, ALenum param, const ALfloat *vals)
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{ Flanger_setParamf(props, context, param, vals[0]); }
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void Flanger_getParami(const EffectProps *props, ALCcontext *context, ALenum param, ALint *val)
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{
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switch(param)
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{
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case AL_FLANGER_WAVEFORM:
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*val = props->Chorus.Waveform;
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break;
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case AL_FLANGER_PHASE:
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*val = props->Chorus.Phase;
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break;
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default:
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alSetError(context, AL_INVALID_ENUM, "Invalid flanger integer property 0x%04x", param);
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}
|
|
}
|
|
void Flanger_getParamiv(const EffectProps *props, ALCcontext *context, ALenum param, ALint *vals)
|
|
{ Flanger_getParami(props, context, param, vals); }
|
|
void Flanger_getParamf(const EffectProps *props, ALCcontext *context, ALenum param, ALfloat *val)
|
|
{
|
|
switch(param)
|
|
{
|
|
case AL_FLANGER_RATE:
|
|
*val = props->Chorus.Rate;
|
|
break;
|
|
|
|
case AL_FLANGER_DEPTH:
|
|
*val = props->Chorus.Depth;
|
|
break;
|
|
|
|
case AL_FLANGER_FEEDBACK:
|
|
*val = props->Chorus.Feedback;
|
|
break;
|
|
|
|
case AL_FLANGER_DELAY:
|
|
*val = props->Chorus.Delay;
|
|
break;
|
|
|
|
default:
|
|
alSetError(context, AL_INVALID_ENUM, "Invalid flanger float property 0x%04x", param);
|
|
}
|
|
}
|
|
void Flanger_getParamfv(const EffectProps *props, ALCcontext *context, ALenum param, ALfloat *vals)
|
|
{ Flanger_getParamf(props, context, param, vals); }
|
|
|
|
DEFINE_ALEFFECT_VTABLE(Flanger);
|
|
|
|
|
|
/* Flanger is basically a chorus with a really short delay. They can both use
|
|
* the same processing functions, so piggyback flanger on the chorus functions.
|
|
*/
|
|
struct FlangerStateFactory final : public EffectStateFactory {
|
|
EffectState *create() override { return new ChorusState{}; }
|
|
EffectProps getDefaultProps() const noexcept override;
|
|
const EffectVtable *getEffectVtable() const noexcept override { return &Flanger_vtable; }
|
|
};
|
|
|
|
EffectProps FlangerStateFactory::getDefaultProps() const noexcept
|
|
{
|
|
EffectProps props{};
|
|
props.Chorus.Waveform = AL_FLANGER_DEFAULT_WAVEFORM;
|
|
props.Chorus.Phase = AL_FLANGER_DEFAULT_PHASE;
|
|
props.Chorus.Rate = AL_FLANGER_DEFAULT_RATE;
|
|
props.Chorus.Depth = AL_FLANGER_DEFAULT_DEPTH;
|
|
props.Chorus.Feedback = AL_FLANGER_DEFAULT_FEEDBACK;
|
|
props.Chorus.Delay = AL_FLANGER_DEFAULT_DELAY;
|
|
return props;
|
|
}
|
|
|
|
} // namespace
|
|
|
|
EffectStateFactory *ChorusStateFactory_getFactory()
|
|
{
|
|
static ChorusStateFactory ChorusFactory{};
|
|
return &ChorusFactory;
|
|
}
|
|
|
|
EffectStateFactory *FlangerStateFactory_getFactory()
|
|
{
|
|
static FlangerStateFactory FlangerFactory{};
|
|
return &FlangerFactory;
|
|
}
|