273 lines
9.2 KiB
C++
273 lines
9.2 KiB
C++
/**
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* OpenAL cross platform audio library
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* Copyright (C) 2009 by Chris Robinson.
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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 <math.h>
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#include <stdlib.h>
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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 "alFilter.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/defs.h"
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#include "vector.h"
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struct ALechoState final : public EffectState {
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al::vector<ALfloat,16> mSampleBuffer;
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// The echo is two tap. The delay is the number of samples from before the
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// current offset
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struct {
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ALsizei delay{0};
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} mTap[2];
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ALsizei mOffset{0};
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/* The panning gains for the two taps */
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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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ALfloat mFeedGain{0.0f};
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BiquadFilter mFilter;
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ALboolean deviceUpdate(const ALCdevice *device) override;
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void update(const ALCcontext *context, const ALeffectslot *slot, const ALeffectProps *props, const EffectTarget target) override;
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void process(ALsizei samplesToDo, const ALfloat (*RESTRICT samplesIn)[BUFFERSIZE], ALfloat (*RESTRICT samplesOut)[BUFFERSIZE], ALsizei numChannels) override;
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DEF_NEWDEL(ALechoState)
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};
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ALboolean ALechoState::deviceUpdate(const ALCdevice *Device)
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{
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ALuint maxlen;
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// Use the next power of 2 for the buffer length, so the tap offsets can be
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// wrapped using a mask instead of a modulo
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maxlen = float2int(AL_ECHO_MAX_DELAY*Device->Frequency + 0.5f) +
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float2int(AL_ECHO_MAX_LRDELAY*Device->Frequency + 0.5f);
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maxlen = NextPowerOf2(maxlen);
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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 ALechoState::update(const ALCcontext *context, const ALeffectslot *slot, const ALeffectProps *props, const EffectTarget target)
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{
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const ALCdevice *device = context->Device;
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ALuint frequency = device->Frequency;
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ALfloat gainhf, lrpan, spread;
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mTap[0].delay = maxi(float2int(props->Echo.Delay*frequency + 0.5f), 1);
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mTap[1].delay = float2int(props->Echo.LRDelay*frequency + 0.5f);
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mTap[1].delay += mTap[0].delay;
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spread = props->Echo.Spread;
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if(spread < 0.0f) lrpan = -1.0f;
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else lrpan = 1.0f;
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/* Convert echo spread (where 0 = omni, +/-1 = directional) to coverage
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* spread (where 0 = point, tau = omni).
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*/
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spread = asinf(1.0f - fabsf(spread))*4.0f;
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mFeedGain = props->Echo.Feedback;
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gainhf = maxf(1.0f - props->Echo.Damping, 0.0625f); /* Limit -24dB */
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mFilter.setParams(BiquadType::HighShelf, gainhf, LOWPASSFREQREF/frequency,
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calc_rcpQ_from_slope(gainhf, 1.0f)
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);
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ALfloat coeffs[2][MAX_AMBI_COEFFS];
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CalcAngleCoeffs(-F_PI_2*lrpan, 0.0f, spread, coeffs[0]);
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CalcAngleCoeffs( F_PI_2*lrpan, 0.0f, spread, 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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}
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void ALechoState::process(ALsizei SamplesToDo, const ALfloat (*RESTRICT SamplesIn)[BUFFERSIZE], ALfloat (*RESTRICT SamplesOut)[BUFFERSIZE], ALsizei NumChannels)
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{
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const auto mask = static_cast<ALsizei>(mSampleBuffer.size()-1);
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const ALsizei tap1{mTap[0].delay};
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const ALsizei tap2{mTap[1].delay};
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ALfloat *RESTRICT delaybuf{mSampleBuffer.data()};
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ALsizei offset{mOffset};
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ALfloat z1, z2;
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ALsizei base;
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ALsizei c, i;
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std::tie(z1, z2) = mFilter.getComponents();
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for(base = 0;base < SamplesToDo;)
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{
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alignas(16) ALfloat temps[2][128];
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ALsizei td = mini(128, SamplesToDo-base);
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for(i = 0;i < td;i++)
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{
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/* Feed the delay buffer's input first. */
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delaybuf[offset&mask] = SamplesIn[0][i+base];
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/* First tap */
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temps[0][i] = delaybuf[(offset-tap1) & mask];
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/* Second tap */
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temps[1][i] = delaybuf[(offset-tap2) & mask];
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/* Apply damping to the second tap, then add it to the buffer with
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* feedback attenuation.
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*/
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float out{mFilter.processOne(temps[1][i], z1, z2)};
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delaybuf[offset&mask] += out * mFeedGain;
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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], NumChannels, SamplesOut, mGains[c].Current,
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mGains[c].Target, SamplesToDo-base, base, td);
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base += td;
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}
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mFilter.setComponents(z1, z2);
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mOffset = offset;
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}
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struct EchoStateFactory final : public EffectStateFactory {
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EffectState *create() override;
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};
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EffectState *EchoStateFactory::create()
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{ return new ALechoState{}; }
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EffectStateFactory *EchoStateFactory_getFactory(void)
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{
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static EchoStateFactory EchoFactory{};
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return &EchoFactory;
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}
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void ALecho_setParami(ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALint UNUSED(val))
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{ alSetError(context, AL_INVALID_ENUM, "Invalid echo integer property 0x%04x", param); }
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void ALecho_setParamiv(ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, const ALint *UNUSED(vals))
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{ alSetError(context, AL_INVALID_ENUM, "Invalid echo integer-vector property 0x%04x", param); }
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void ALecho_setParamf(ALeffect *effect, ALCcontext *context, ALenum param, ALfloat val)
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{
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ALeffectProps *props = &effect->Props;
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switch(param)
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{
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case AL_ECHO_DELAY:
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if(!(val >= AL_ECHO_MIN_DELAY && val <= AL_ECHO_MAX_DELAY))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Echo delay out of range");
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props->Echo.Delay = val;
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break;
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case AL_ECHO_LRDELAY:
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if(!(val >= AL_ECHO_MIN_LRDELAY && val <= AL_ECHO_MAX_LRDELAY))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Echo LR delay out of range");
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props->Echo.LRDelay = val;
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break;
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case AL_ECHO_DAMPING:
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if(!(val >= AL_ECHO_MIN_DAMPING && val <= AL_ECHO_MAX_DAMPING))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Echo damping out of range");
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props->Echo.Damping = val;
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break;
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case AL_ECHO_FEEDBACK:
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if(!(val >= AL_ECHO_MIN_FEEDBACK && val <= AL_ECHO_MAX_FEEDBACK))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Echo feedback out of range");
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props->Echo.Feedback = val;
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break;
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case AL_ECHO_SPREAD:
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if(!(val >= AL_ECHO_MIN_SPREAD && val <= AL_ECHO_MAX_SPREAD))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Echo spread out of range");
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props->Echo.Spread = val;
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break;
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default:
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alSetError(context, AL_INVALID_ENUM, "Invalid echo float property 0x%04x", param);
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}
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}
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void ALecho_setParamfv(ALeffect *effect, ALCcontext *context, ALenum param, const ALfloat *vals)
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{ ALecho_setParamf(effect, context, param, vals[0]); }
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void ALecho_getParami(const ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALint *UNUSED(val))
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{ alSetError(context, AL_INVALID_ENUM, "Invalid echo integer property 0x%04x", param); }
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void ALecho_getParamiv(const ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALint *UNUSED(vals))
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{ alSetError(context, AL_INVALID_ENUM, "Invalid echo integer-vector property 0x%04x", param); }
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void ALecho_getParamf(const ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *val)
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{
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const ALeffectProps *props = &effect->Props;
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switch(param)
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{
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case AL_ECHO_DELAY:
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*val = props->Echo.Delay;
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break;
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case AL_ECHO_LRDELAY:
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*val = props->Echo.LRDelay;
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break;
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case AL_ECHO_DAMPING:
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*val = props->Echo.Damping;
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break;
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case AL_ECHO_FEEDBACK:
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*val = props->Echo.Feedback;
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break;
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case AL_ECHO_SPREAD:
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*val = props->Echo.Spread;
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break;
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default:
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alSetError(context, AL_INVALID_ENUM, "Invalid echo float property 0x%04x", param);
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}
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}
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void ALecho_getParamfv(const ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *vals)
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{ ALecho_getParamf(effect, context, param, vals); }
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DEFINE_ALEFFECT_VTABLE(ALecho);
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