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Diffstat (limited to 'Alc/effects/echo.cpp')
| -rw-r--r-- | Alc/effects/echo.cpp | 271 |
1 files changed, 0 insertions, 271 deletions
diff --git a/Alc/effects/echo.cpp b/Alc/effects/echo.cpp deleted file mode 100644 index c10f2eb2..00000000 --- a/Alc/effects/echo.cpp +++ /dev/null @@ -1,271 +0,0 @@ -/** - * OpenAL cross platform audio library - * Copyright (C) 2009 by Chris Robinson. - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Library General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Library General Public License for more details. - * - * You should have received a copy of the GNU Library General Public - * License along with this library; if not, write to the - * Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - * Or go to http://www.gnu.org/copyleft/lgpl.html - */ - -#include "config.h" - -#include <cmath> -#include <cstdlib> - -#include <algorithm> - -#include "alcmain.h" -#include "alcontext.h" -#include "alFilter.h" -#include "alAuxEffectSlot.h" -#include "alError.h" -#include "alu.h" -#include "filters/biquad.h" -#include "vector.h" - - -namespace { - -struct EchoState final : public EffectState { - al::vector<ALfloat,16> mSampleBuffer; - - // The echo is two tap. The delay is the number of samples from before the - // current offset - struct { - ALsizei delay{0}; - } mTap[2]; - ALsizei mOffset{0}; - - /* The panning gains for the two taps */ - struct { - ALfloat Current[MAX_OUTPUT_CHANNELS]{}; - ALfloat Target[MAX_OUTPUT_CHANNELS]{}; - } mGains[2]; - - BiquadFilter mFilter; - ALfloat mFeedGain{0.0f}; - - alignas(16) ALfloat mTempBuffer[2][BUFFERSIZE]; - - ALboolean deviceUpdate(const ALCdevice *device) override; - void update(const ALCcontext *context, const ALeffectslot *slot, const EffectProps *props, const EffectTarget target) override; - void process(const ALsizei samplesToDo, const FloatBufferLine *RESTRICT samplesIn, const ALsizei numInput, const al::span<FloatBufferLine> samplesOut) override; - - DEF_NEWDEL(EchoState) -}; - -ALboolean EchoState::deviceUpdate(const ALCdevice *Device) -{ - ALuint maxlen; - - // Use the next power of 2 for the buffer length, so the tap offsets can be - // wrapped using a mask instead of a modulo - maxlen = float2int(AL_ECHO_MAX_DELAY*Device->Frequency + 0.5f) + - float2int(AL_ECHO_MAX_LRDELAY*Device->Frequency + 0.5f); - maxlen = NextPowerOf2(maxlen); - if(maxlen <= 0) return AL_FALSE; - - if(maxlen != mSampleBuffer.size()) - { - mSampleBuffer.resize(maxlen); - mSampleBuffer.shrink_to_fit(); - } - - std::fill(mSampleBuffer.begin(), mSampleBuffer.end(), 0.0f); - for(auto &e : mGains) - { - std::fill(std::begin(e.Current), std::end(e.Current), 0.0f); - std::fill(std::begin(e.Target), std::end(e.Target), 0.0f); - } - - return AL_TRUE; -} - -void EchoState::update(const ALCcontext *context, const ALeffectslot *slot, const EffectProps *props, const EffectTarget target) -{ - const ALCdevice *device = context->Device; - const auto frequency = static_cast<ALfloat>(device->Frequency); - - mTap[0].delay = maxi(float2int(props->Echo.Delay*frequency + 0.5f), 1); - mTap[1].delay = float2int(props->Echo.LRDelay*frequency + 0.5f) + mTap[0].delay; - - const ALfloat gainhf{maxf(1.0f - props->Echo.Damping, 0.0625f)}; /* Limit -24dB */ - mFilter.setParams(BiquadType::HighShelf, gainhf, LOWPASSFREQREF/frequency, - mFilter.rcpQFromSlope(gainhf, 1.0f)); - - mFeedGain = props->Echo.Feedback; - - /* Convert echo spread (where 0 = center, +/-1 = sides) to angle. */ - const ALfloat angle{std::asin(props->Echo.Spread)}; - - ALfloat coeffs[2][MAX_AMBI_CHANNELS]; - CalcAngleCoeffs(-angle, 0.0f, 0.0f, coeffs[0]); - CalcAngleCoeffs( angle, 0.0f, 0.0f, coeffs[1]); - - mOutTarget = target.Main->Buffer; - ComputePanGains(target.Main, coeffs[0], slot->Params.Gain, mGains[0].Target); - ComputePanGains(target.Main, coeffs[1], slot->Params.Gain, mGains[1].Target); -} - -void EchoState::process(const ALsizei samplesToDo, const FloatBufferLine *RESTRICT samplesIn, const ALsizei /*numInput*/, const al::span<FloatBufferLine> samplesOut) -{ - const auto mask = static_cast<ALsizei>(mSampleBuffer.size()-1); - ALfloat *RESTRICT delaybuf{mSampleBuffer.data()}; - ALsizei offset{mOffset}; - ALsizei tap1{offset - mTap[0].delay}; - ALsizei tap2{offset - mTap[1].delay}; - ALfloat z1, z2; - - ASSUME(samplesToDo > 0); - ASSUME(mask > 0); - - std::tie(z1, z2) = mFilter.getComponents(); - for(ALsizei i{0};i < samplesToDo;) - { - offset &= mask; - tap1 &= mask; - tap2 &= mask; - - ALsizei td{mini(mask+1 - maxi(offset, maxi(tap1, tap2)), samplesToDo-i)}; - do { - /* Feed the delay buffer's input first. */ - delaybuf[offset] = samplesIn[0][i]; - - /* Get delayed output from the first and second taps. Use the - * second tap for feedback. - */ - mTempBuffer[0][i] = delaybuf[tap1++]; - mTempBuffer[1][i] = delaybuf[tap2++]; - const float feedb{mTempBuffer[1][i++]}; - - /* Add feedback to the delay buffer with damping and attenuation. */ - delaybuf[offset++] += mFilter.processOne(feedb, z1, z2) * mFeedGain; - } while(--td); - } - mFilter.setComponents(z1, z2); - mOffset = offset; - - for(ALsizei c{0};c < 2;c++) - MixSamples(mTempBuffer[c], samplesOut, mGains[c].Current, mGains[c].Target, samplesToDo, 0, - samplesToDo); -} - - -void Echo_setParami(EffectProps*, ALCcontext *context, ALenum param, ALint) -{ alSetError(context, AL_INVALID_ENUM, "Invalid echo integer property 0x%04x", param); } -void Echo_setParamiv(EffectProps*, ALCcontext *context, ALenum param, const ALint*) -{ alSetError(context, AL_INVALID_ENUM, "Invalid echo integer-vector property 0x%04x", param); } -void Echo_setParamf(EffectProps *props, ALCcontext *context, ALenum param, ALfloat val) -{ - switch(param) - { - case AL_ECHO_DELAY: - if(!(val >= AL_ECHO_MIN_DELAY && val <= AL_ECHO_MAX_DELAY)) - SETERR_RETURN(context, AL_INVALID_VALUE,, "Echo delay out of range"); - props->Echo.Delay = val; - break; - - case AL_ECHO_LRDELAY: - if(!(val >= AL_ECHO_MIN_LRDELAY && val <= AL_ECHO_MAX_LRDELAY)) - SETERR_RETURN(context, AL_INVALID_VALUE,, "Echo LR delay out of range"); - props->Echo.LRDelay = val; - break; - - case AL_ECHO_DAMPING: - if(!(val >= AL_ECHO_MIN_DAMPING && val <= AL_ECHO_MAX_DAMPING)) - SETERR_RETURN(context, AL_INVALID_VALUE,, "Echo damping out of range"); - props->Echo.Damping = val; - break; - - case AL_ECHO_FEEDBACK: - if(!(val >= AL_ECHO_MIN_FEEDBACK && val <= AL_ECHO_MAX_FEEDBACK)) - SETERR_RETURN(context, AL_INVALID_VALUE,, "Echo feedback out of range"); - props->Echo.Feedback = val; - break; - - case AL_ECHO_SPREAD: - if(!(val >= AL_ECHO_MIN_SPREAD && val <= AL_ECHO_MAX_SPREAD)) - SETERR_RETURN(context, AL_INVALID_VALUE,, "Echo spread out of range"); - props->Echo.Spread = val; - break; - - default: - alSetError(context, AL_INVALID_ENUM, "Invalid echo float property 0x%04x", param); - } -} -void Echo_setParamfv(EffectProps *props, ALCcontext *context, ALenum param, const ALfloat *vals) -{ Echo_setParamf(props, context, param, vals[0]); } - -void Echo_getParami(const EffectProps*, ALCcontext *context, ALenum param, ALint*) -{ alSetError(context, AL_INVALID_ENUM, "Invalid echo integer property 0x%04x", param); } -void Echo_getParamiv(const EffectProps*, ALCcontext *context, ALenum param, ALint*) -{ alSetError(context, AL_INVALID_ENUM, "Invalid echo integer-vector property 0x%04x", param); } -void Echo_getParamf(const EffectProps *props, ALCcontext *context, ALenum param, ALfloat *val) -{ - switch(param) - { - case AL_ECHO_DELAY: - *val = props->Echo.Delay; - break; - - case AL_ECHO_LRDELAY: - *val = props->Echo.LRDelay; - break; - - case AL_ECHO_DAMPING: - *val = props->Echo.Damping; - break; - - case AL_ECHO_FEEDBACK: - *val = props->Echo.Feedback; - break; - - case AL_ECHO_SPREAD: - *val = props->Echo.Spread; - break; - - default: - alSetError(context, AL_INVALID_ENUM, "Invalid echo float property 0x%04x", param); - } -} -void Echo_getParamfv(const EffectProps *props, ALCcontext *context, ALenum param, ALfloat *vals) -{ Echo_getParamf(props, context, param, vals); } - -DEFINE_ALEFFECT_VTABLE(Echo); - - -struct EchoStateFactory final : public EffectStateFactory { - EffectState *create() override { return new EchoState{}; } - EffectProps getDefaultProps() const noexcept override; - const EffectVtable *getEffectVtable() const noexcept override { return &Echo_vtable; } -}; - -EffectProps EchoStateFactory::getDefaultProps() const noexcept -{ - EffectProps props{}; - props.Echo.Delay = AL_ECHO_DEFAULT_DELAY; - props.Echo.LRDelay = AL_ECHO_DEFAULT_LRDELAY; - props.Echo.Damping = AL_ECHO_DEFAULT_DAMPING; - props.Echo.Feedback = AL_ECHO_DEFAULT_FEEDBACK; - props.Echo.Spread = AL_ECHO_DEFAULT_SPREAD; - return props; -} - -} // namespace - -EffectStateFactory *EchoStateFactory_getFactory() -{ - static EchoStateFactory EchoFactory{}; - return &EchoFactory; -} |