352 lines
15 KiB
C++
352 lines
15 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 <math.h>
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#include <stdlib.h>
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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/defs.h"
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#include "vecmat.h"
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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 ALequalizerState final : public ALeffectState {
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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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} Chans[MAX_EFFECT_CHANNELS];
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ALfloat SampleBuffer[MAX_EFFECT_CHANNELS][BUFFERSIZE];
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};
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static ALvoid ALequalizerState_Destruct(ALequalizerState *state);
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static ALboolean ALequalizerState_deviceUpdate(ALequalizerState *state, ALCdevice *device);
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static ALvoid ALequalizerState_update(ALequalizerState *state, const ALCcontext *context, const ALeffectslot *slot, const ALeffectProps *props);
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static ALvoid ALequalizerState_process(ALequalizerState *state, ALsizei SamplesToDo, const ALfloat (*RESTRICT SamplesIn)[BUFFERSIZE], ALfloat (*RESTRICT SamplesOut)[BUFFERSIZE], ALsizei NumChannels);
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DECLARE_DEFAULT_ALLOCATORS(ALequalizerState)
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DEFINE_ALEFFECTSTATE_VTABLE(ALequalizerState);
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static void ALequalizerState_Construct(ALequalizerState *state)
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{
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new (state) ALequalizerState{};
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ALeffectState_Construct(STATIC_CAST(ALeffectState, state));
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SET_VTABLE2(ALequalizerState, ALeffectState, state);
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}
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static ALvoid ALequalizerState_Destruct(ALequalizerState *state)
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{
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ALeffectState_Destruct(STATIC_CAST(ALeffectState,state));
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state->~ALequalizerState();
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}
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static ALboolean ALequalizerState_deviceUpdate(ALequalizerState *state, ALCdevice *UNUSED(device))
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{
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ALsizei i, j;
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for(i = 0; i < MAX_EFFECT_CHANNELS;i++)
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{
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for(j = 0;j < 4;j++)
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BiquadFilter_clear(&state->Chans[i].filter[j]);
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for(j = 0;j < MAX_OUTPUT_CHANNELS;j++)
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state->Chans[i].CurrentGains[j] = 0.0f;
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}
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return AL_TRUE;
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}
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static ALvoid ALequalizerState_update(ALequalizerState *state, const ALCcontext *context, const ALeffectslot *slot, const ALeffectProps *props)
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{
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const ALCdevice *device = context->Device;
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ALfloat frequency = (ALfloat)device->Frequency;
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ALfloat gain, f0norm;
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ALuint i;
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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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BiquadFilter_setParams(&state->Chans[0].filter[0], BiquadType_LowShelf,
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gain, f0norm, calc_rcpQ_from_slope(gain, 0.75f)
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);
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gain = maxf(props->Equalizer.Mid1Gain, 0.0625f);
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f0norm = props->Equalizer.Mid1Center/frequency;
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BiquadFilter_setParams(&state->Chans[0].filter[1], BiquadType_Peaking,
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gain, f0norm, calc_rcpQ_from_bandwidth(
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f0norm, props->Equalizer.Mid1Width
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)
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);
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gain = maxf(props->Equalizer.Mid2Gain, 0.0625f);
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f0norm = props->Equalizer.Mid2Center/frequency;
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BiquadFilter_setParams(&state->Chans[0].filter[2], BiquadType_Peaking,
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gain, f0norm, calc_rcpQ_from_bandwidth(
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f0norm, props->Equalizer.Mid2Width
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)
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);
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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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BiquadFilter_setParams(&state->Chans[0].filter[3], BiquadType_HighShelf,
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gain, f0norm, calc_rcpQ_from_slope(gain, 0.75f)
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);
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/* Copy the filter coefficients for the other input channels. */
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for(i = 1;i < MAX_EFFECT_CHANNELS;i++)
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{
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BiquadFilter_copyParams(&state->Chans[i].filter[0], &state->Chans[0].filter[0]);
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BiquadFilter_copyParams(&state->Chans[i].filter[1], &state->Chans[0].filter[1]);
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BiquadFilter_copyParams(&state->Chans[i].filter[2], &state->Chans[0].filter[2]);
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BiquadFilter_copyParams(&state->Chans[i].filter[3], &state->Chans[0].filter[3]);
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}
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STATIC_CAST(ALeffectState,state)->OutBuffer = device->FOAOut.Buffer;
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STATIC_CAST(ALeffectState,state)->OutChannels = device->FOAOut.NumChannels;
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for(i = 0;i < MAX_EFFECT_CHANNELS;i++)
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ComputePanGains(&device->FOAOut, aluMatrixf::Identity.m[i], slot->Params.Gain,
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state->Chans[i].TargetGains);
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}
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static ALvoid ALequalizerState_process(ALequalizerState *state, ALsizei SamplesToDo, const ALfloat (*RESTRICT SamplesIn)[BUFFERSIZE], ALfloat (*RESTRICT SamplesOut)[BUFFERSIZE], ALsizei NumChannels)
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{
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ALfloat (*RESTRICT temps)[BUFFERSIZE] = state->SampleBuffer;
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ALsizei c;
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for(c = 0;c < MAX_EFFECT_CHANNELS;c++)
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{
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BiquadFilter_process(&state->Chans[c].filter[0], temps[0], SamplesIn[c], SamplesToDo);
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BiquadFilter_process(&state->Chans[c].filter[1], temps[1], temps[0], SamplesToDo);
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BiquadFilter_process(&state->Chans[c].filter[2], temps[2], temps[1], SamplesToDo);
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BiquadFilter_process(&state->Chans[c].filter[3], temps[3], temps[2], SamplesToDo);
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MixSamples(temps[3], NumChannels, SamplesOut,
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state->Chans[c].CurrentGains, state->Chans[c].TargetGains,
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SamplesToDo, 0, SamplesToDo
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);
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}
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}
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struct EqualizerStateFactory final : public EffectStateFactory {
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ALeffectState *create() override;
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};
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ALeffectState *EqualizerStateFactory::create()
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{
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ALequalizerState *state;
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NEW_OBJ0(state, ALequalizerState)();
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return state;
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}
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EffectStateFactory *EqualizerStateFactory_getFactory(void)
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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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void ALequalizer_setParami(ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALint UNUSED(val))
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{ alSetError(context, AL_INVALID_ENUM, "Invalid equalizer integer property 0x%04x", param); }
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void ALequalizer_setParamiv(ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, const ALint *UNUSED(vals))
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{ alSetError(context, AL_INVALID_ENUM, "Invalid equalizer integer-vector property 0x%04x", param); }
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void ALequalizer_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_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 ALequalizer_setParamfv(ALeffect *effect, ALCcontext *context, ALenum param, const ALfloat *vals)
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{ ALequalizer_setParamf(effect, context, param, vals[0]); }
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void ALequalizer_getParami(const ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALint *UNUSED(val))
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{ alSetError(context, AL_INVALID_ENUM, "Invalid equalizer integer property 0x%04x", param); }
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void ALequalizer_getParamiv(const ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALint *UNUSED(vals))
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{ alSetError(context, AL_INVALID_ENUM, "Invalid equalizer integer-vector property 0x%04x", param); }
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void ALequalizer_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_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 ALequalizer_getParamfv(const ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *vals)
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{ ALequalizer_getParamf(effect, context, param, vals); }
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DEFINE_ALEFFECT_VTABLE(ALequalizer);
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