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243 lines
8.9 KiB
C
243 lines
8.9 KiB
C
/**
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* OpenAL cross platform audio library
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* Copyright (C) 2013 by Anis A. Hireche
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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 <stdlib.h>
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#include "config.h"
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#include "alError.h"
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#include "alMain.h"
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#include "alAuxEffectSlot.h"
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#include "alu.h"
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#define AMP_ENVELOPE_MIN 0.5f
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#define AMP_ENVELOPE_MAX 2.0f
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#define ATTACK_TIME 0.1f /* 100ms to rise from min to max */
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#define RELEASE_TIME 0.2f /* 200ms to drop from max to min */
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typedef struct ALcompressorState {
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DERIVE_FROM_TYPE(ALeffectState);
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/* Effect gains for each channel */
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ALfloat Gain[MAX_EFFECT_CHANNELS][MAX_OUTPUT_CHANNELS];
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/* Effect parameters */
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ALboolean Enabled;
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ALfloat AttackMult;
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ALfloat ReleaseMult;
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ALfloat EnvFollower;
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} ALcompressorState;
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static ALvoid ALcompressorState_Destruct(ALcompressorState *state);
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static ALboolean ALcompressorState_deviceUpdate(ALcompressorState *state, ALCdevice *device);
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static ALvoid ALcompressorState_update(ALcompressorState *state, const ALCcontext *context, const ALeffectslot *slot, const ALeffectProps *props);
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static ALvoid ALcompressorState_process(ALcompressorState *state, ALsizei SamplesToDo, const ALfloat (*restrict SamplesIn)[BUFFERSIZE], ALfloat (*restrict SamplesOut)[BUFFERSIZE], ALsizei NumChannels);
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DECLARE_DEFAULT_ALLOCATORS(ALcompressorState)
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DEFINE_ALEFFECTSTATE_VTABLE(ALcompressorState);
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static void ALcompressorState_Construct(ALcompressorState *state)
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{
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ALeffectState_Construct(STATIC_CAST(ALeffectState, state));
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SET_VTABLE2(ALcompressorState, ALeffectState, state);
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state->Enabled = AL_TRUE;
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state->AttackMult = 1.0f;
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state->ReleaseMult = 1.0f;
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state->EnvFollower = 1.0f;
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}
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static ALvoid ALcompressorState_Destruct(ALcompressorState *state)
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{
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ALeffectState_Destruct(STATIC_CAST(ALeffectState,state));
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}
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static ALboolean ALcompressorState_deviceUpdate(ALcompressorState *state, ALCdevice *device)
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{
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/* Number of samples to do a full attack and release (non-integer sample
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* counts are okay).
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*/
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const ALfloat attackCount = (ALfloat)device->Frequency * ATTACK_TIME;
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const ALfloat releaseCount = (ALfloat)device->Frequency * RELEASE_TIME;
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/* Calculate per-sample multipliers to attack and release at the desired
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* rates.
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*/
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state->AttackMult = powf(AMP_ENVELOPE_MAX/AMP_ENVELOPE_MIN, 1.0f/attackCount);
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state->ReleaseMult = powf(AMP_ENVELOPE_MIN/AMP_ENVELOPE_MAX, 1.0f/releaseCount);
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return AL_TRUE;
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}
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static ALvoid ALcompressorState_update(ALcompressorState *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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ALuint i;
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state->Enabled = props->Compressor.OnOff;
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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 < 4;i++)
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ComputePanGains(&device->FOAOut, IdentityMatrixf.m[i], slot->Params.Gain, state->Gain[i]);
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}
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static ALvoid ALcompressorState_process(ALcompressorState *state, ALsizei SamplesToDo, const ALfloat (*restrict SamplesIn)[BUFFERSIZE], ALfloat (*restrict SamplesOut)[BUFFERSIZE], ALsizei NumChannels)
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{
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ALsizei i, j, k;
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ALsizei base;
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for(base = 0;base < SamplesToDo;)
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{
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ALfloat gains[256];
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ALsizei td = mini(256, SamplesToDo-base);
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ALfloat env = state->EnvFollower;
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/* Generate the per-sample gains from the signal envelope. */
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if(state->Enabled)
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{
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for(i = 0;i < td;++i)
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{
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/* Clamp the absolute amplitude to the defined envelope limits,
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* then attack or release the envelope to reach it.
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*/
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ALfloat amplitude = clampf(fabsf(SamplesIn[0][base+i]),
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AMP_ENVELOPE_MIN, AMP_ENVELOPE_MAX);
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if(amplitude > env)
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env = minf(env*state->AttackMult, amplitude);
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else if(amplitude < env)
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env = maxf(env*state->ReleaseMult, amplitude);
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/* Apply the reciprocal of the envelope to normalize the volume
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* (compress the dynamic range).
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*/
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gains[i] = 1.0f / env;
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}
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}
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else
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{
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/* Same as above, except the amplitude is forced to 1. This helps
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* ensure smooth gain changes when the compressor is turned on and
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* off.
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*/
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for(i = 0;i < td;++i)
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{
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ALfloat amplitude = 1.0f;
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if(amplitude > env)
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env = minf(env*state->AttackMult, amplitude);
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else if(amplitude < env)
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env = maxf(env*state->ReleaseMult, amplitude);
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gains[i] = 1.0f / env;
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}
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}
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state->EnvFollower = env;
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/* Now compress the signal amplitude to output. */
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for(j = 0;j < MAX_EFFECT_CHANNELS;j++)
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{
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for(k = 0;k < NumChannels;k++)
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{
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ALfloat gain = state->Gain[j][k];
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if(!(fabsf(gain) > GAIN_SILENCE_THRESHOLD))
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continue;
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for(i = 0;i < td;i++)
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SamplesOut[k][base+i] += SamplesIn[j][base+i] * gains[i] * gain;
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}
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}
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base += td;
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}
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}
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typedef struct CompressorStateFactory {
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DERIVE_FROM_TYPE(EffectStateFactory);
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} CompressorStateFactory;
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static ALeffectState *CompressorStateFactory_create(CompressorStateFactory *UNUSED(factory))
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{
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ALcompressorState *state;
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NEW_OBJ0(state, ALcompressorState)();
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if(!state) return NULL;
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return STATIC_CAST(ALeffectState, state);
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}
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DEFINE_EFFECTSTATEFACTORY_VTABLE(CompressorStateFactory);
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EffectStateFactory *CompressorStateFactory_getFactory(void)
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{
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static CompressorStateFactory CompressorFactory = { { GET_VTABLE2(CompressorStateFactory, EffectStateFactory) } };
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return STATIC_CAST(EffectStateFactory, &CompressorFactory);
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}
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void ALcompressor_setParami(ALeffect *effect, ALCcontext *context, ALenum param, ALint 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_COMPRESSOR_ONOFF:
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if(!(val >= AL_COMPRESSOR_MIN_ONOFF && val <= AL_COMPRESSOR_MAX_ONOFF))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Compressor state out of range");
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props->Compressor.OnOff = val;
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break;
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default:
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alSetError(context, AL_INVALID_ENUM, "Invalid compressor integer property 0x%04x",
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param);
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}
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}
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void ALcompressor_setParamiv(ALeffect *effect, ALCcontext *context, ALenum param, const ALint *vals)
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{ ALcompressor_setParami(effect, context, param, vals[0]); }
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void ALcompressor_setParamf(ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALfloat UNUSED(val))
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{ alSetError(context, AL_INVALID_ENUM, "Invalid compressor float property 0x%04x", param); }
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void ALcompressor_setParamfv(ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, const ALfloat *UNUSED(vals))
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{ alSetError(context, AL_INVALID_ENUM, "Invalid compressor float-vector property 0x%04x", param); }
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void ALcompressor_getParami(const ALeffect *effect, ALCcontext *context, ALenum param, ALint *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_COMPRESSOR_ONOFF:
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*val = props->Compressor.OnOff;
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break;
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default:
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alSetError(context, AL_INVALID_ENUM, "Invalid compressor integer property 0x%04x",
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param);
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}
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}
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void ALcompressor_getParamiv(const ALeffect *effect, ALCcontext *context, ALenum param, ALint *vals)
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{ ALcompressor_getParami(effect, context, param, vals); }
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void ALcompressor_getParamf(const ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALfloat *UNUSED(val))
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{ alSetError(context, AL_INVALID_ENUM, "Invalid compressor float property 0x%04x", param); }
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void ALcompressor_getParamfv(const ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALfloat *UNUSED(vals))
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{ alSetError(context, AL_INVALID_ENUM, "Invalid compressor float-vector property 0x%04x", param); }
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DEFINE_ALEFFECT_VTABLE(ALcompressor);
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