255 lines
8.6 KiB
C
255 lines
8.6 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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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 AttackRate;
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ALfloat ReleaseRate;
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ALfloat GainCtrl;
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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 ALCdevice *device, 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->AttackRate = 0.0f;
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state->ReleaseRate = 0.0f;
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state->GainCtrl = 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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const ALfloat attackTime = device->Frequency * 0.2f; /* 200ms Attack */
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const ALfloat releaseTime = device->Frequency * 0.4f; /* 400ms Release */
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state->AttackRate = 1.0f / attackTime;
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state->ReleaseRate = 1.0f / releaseTime;
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return AL_TRUE;
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}
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static ALvoid ALcompressorState_update(ALcompressorState *state, const ALCdevice *device, const ALeffectslot *slot, const ALeffectProps *props)
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{
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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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ComputeFirstOrderGains(device->FOAOut, IdentityMatrixf.m[i],
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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 temps[64][4];
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ALsizei td = mini(64, SamplesToDo-base);
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/* Load samples into the temp buffer first. */
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for(j = 0;j < 4;j++)
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{
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for(i = 0;i < td;i++)
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temps[i][j] = SamplesIn[j][i+base];
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}
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if(state->Enabled)
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{
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ALfloat gain = state->GainCtrl;
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ALfloat output, amplitude;
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for(i = 0;i < td;i++)
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{
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/* Roughly calculate the maximum amplitude from the 4-channel
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* signal, and attack or release the gain control to reach it.
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*/
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amplitude = fabsf(temps[i][0]);
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amplitude = maxf(amplitude + fabsf(temps[i][1]),
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maxf(amplitude + fabsf(temps[i][2]),
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amplitude + fabsf(temps[i][3])));
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if(amplitude > gain)
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gain = minf(gain+state->AttackRate, amplitude);
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else if(amplitude < gain)
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gain = maxf(gain-state->ReleaseRate, amplitude);
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/* Apply the inverse of the gain control to normalize/compress
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* the volume. */
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output = 1.0f / clampf(gain, 0.5f, 2.0f);
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for(j = 0;j < 4;j++)
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temps[i][j] *= output;
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}
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state->GainCtrl = gain;
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}
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else
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{
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ALfloat gain = state->GainCtrl;
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ALfloat output, amplitude;
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for(i = 0;i < td;i++)
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{
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/* Same as above, except the amplitude is forced to 1. This
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* helps ensure smooth gain changes when the compressor is
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* turned on and off.
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*/
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amplitude = 1.0f;
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if(amplitude > gain)
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gain = minf(gain+state->AttackRate, amplitude);
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else if(amplitude < gain)
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gain = maxf(gain-state->ReleaseRate, amplitude);
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output = 1.0f / clampf(gain, 0.5f, 2.0f);
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for(j = 0;j < 4;j++)
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temps[i][j] *= output;
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}
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state->GainCtrl = gain;
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}
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/* Now mix to the output. */
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for(j = 0;j < 4;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] += gain * temps[i][j];
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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 ALcompressorStateFactory {
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DERIVE_FROM_TYPE(ALeffectStateFactory);
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} ALcompressorStateFactory;
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static ALeffectState *ALcompressorStateFactory_create(ALcompressorStateFactory *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_ALEFFECTSTATEFACTORY_VTABLE(ALcompressorStateFactory);
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ALeffectStateFactory *ALcompressorStateFactory_getFactory(void)
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{
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static ALcompressorStateFactory CompressorFactory = { { GET_VTABLE2(ALcompressorStateFactory, ALeffectStateFactory) } };
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return STATIC_CAST(ALeffectStateFactory, &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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SET_ERROR_AND_RETURN(context, AL_INVALID_VALUE);
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props->Compressor.OnOff = val;
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break;
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default:
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SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM);
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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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{
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ALcompressor_setParami(effect, context, param, vals[0]);
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}
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void ALcompressor_setParamf(ALeffect *UNUSED(effect), ALCcontext *context, ALenum UNUSED(param), ALfloat UNUSED(val))
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{ SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM); }
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void ALcompressor_setParamfv(ALeffect *effect, ALCcontext *context, ALenum param, const ALfloat *vals)
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{
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ALcompressor_setParamf(effect, context, param, vals[0]);
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}
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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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SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM);
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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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{
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ALcompressor_getParami(effect, context, param, vals);
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}
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void ALcompressor_getParamf(const ALeffect *UNUSED(effect), ALCcontext *context, ALenum UNUSED(param), ALfloat *UNUSED(val))
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{ SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM); }
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void ALcompressor_getParamfv(const ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *vals)
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{
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ALcompressor_getParamf(effect, context, param, vals);
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}
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DEFINE_ALEFFECT_VTABLE(ALcompressor);
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