diff options
author | Chris Robinson <[email protected]> | 2018-11-17 07:08:41 -0800 |
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committer | Chris Robinson <[email protected]> | 2018-11-17 07:08:41 -0800 |
commit | 13478126cb7d41e8f6efebf020fb5a387c303f2d (patch) | |
tree | 5a37eaab19e25546df413209eab0ee41b6763d6d /Alc/effects/compressor.c | |
parent | 93d96ced9cef7200b04dbfec51325a3c9c55af19 (diff) |
Convert the remaining effects to C++
Diffstat (limited to 'Alc/effects/compressor.c')
-rw-r--r-- | Alc/effects/compressor.c | 243 |
1 files changed, 0 insertions, 243 deletions
diff --git a/Alc/effects/compressor.c b/Alc/effects/compressor.c deleted file mode 100644 index d9b9f1e0..00000000 --- a/Alc/effects/compressor.c +++ /dev/null @@ -1,243 +0,0 @@ -/** - * OpenAL cross platform audio library - * Copyright (C) 2013 by Anis A. Hireche - * 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 <stdlib.h> - -#include "config.h" -#include "alError.h" -#include "alMain.h" -#include "alAuxEffectSlot.h" -#include "alu.h" - - -#define AMP_ENVELOPE_MIN 0.5f -#define AMP_ENVELOPE_MAX 2.0f - -#define ATTACK_TIME 0.1f /* 100ms to rise from min to max */ -#define RELEASE_TIME 0.2f /* 200ms to drop from max to min */ - - -typedef struct ALcompressorState { - DERIVE_FROM_TYPE(ALeffectState); - - /* Effect gains for each channel */ - ALfloat Gain[MAX_EFFECT_CHANNELS][MAX_OUTPUT_CHANNELS]; - - /* Effect parameters */ - ALboolean Enabled; - ALfloat AttackMult; - ALfloat ReleaseMult; - ALfloat EnvFollower; -} ALcompressorState; - -static ALvoid ALcompressorState_Destruct(ALcompressorState *state); -static ALboolean ALcompressorState_deviceUpdate(ALcompressorState *state, ALCdevice *device); -static ALvoid ALcompressorState_update(ALcompressorState *state, const ALCcontext *context, const ALeffectslot *slot, const ALeffectProps *props); -static ALvoid ALcompressorState_process(ALcompressorState *state, ALsizei SamplesToDo, const ALfloat (*RESTRICT SamplesIn)[BUFFERSIZE], ALfloat (*RESTRICT SamplesOut)[BUFFERSIZE], ALsizei NumChannels); -DECLARE_DEFAULT_ALLOCATORS(ALcompressorState) - -DEFINE_ALEFFECTSTATE_VTABLE(ALcompressorState); - - -static void ALcompressorState_Construct(ALcompressorState *state) -{ - ALeffectState_Construct(STATIC_CAST(ALeffectState, state)); - SET_VTABLE2(ALcompressorState, ALeffectState, state); - - state->Enabled = AL_TRUE; - state->AttackMult = 1.0f; - state->ReleaseMult = 1.0f; - state->EnvFollower = 1.0f; -} - -static ALvoid ALcompressorState_Destruct(ALcompressorState *state) -{ - ALeffectState_Destruct(STATIC_CAST(ALeffectState,state)); -} - -static ALboolean ALcompressorState_deviceUpdate(ALcompressorState *state, ALCdevice *device) -{ - /* Number of samples to do a full attack and release (non-integer sample - * counts are okay). - */ - const ALfloat attackCount = (ALfloat)device->Frequency * ATTACK_TIME; - const ALfloat releaseCount = (ALfloat)device->Frequency * RELEASE_TIME; - - /* Calculate per-sample multipliers to attack and release at the desired - * rates. - */ - state->AttackMult = powf(AMP_ENVELOPE_MAX/AMP_ENVELOPE_MIN, 1.0f/attackCount); - state->ReleaseMult = powf(AMP_ENVELOPE_MIN/AMP_ENVELOPE_MAX, 1.0f/releaseCount); - - return AL_TRUE; -} - -static ALvoid ALcompressorState_update(ALcompressorState *state, const ALCcontext *context, const ALeffectslot *slot, const ALeffectProps *props) -{ - const ALCdevice *device = context->Device; - ALuint i; - - state->Enabled = props->Compressor.OnOff; - - STATIC_CAST(ALeffectState,state)->OutBuffer = device->FOAOut.Buffer; - STATIC_CAST(ALeffectState,state)->OutChannels = device->FOAOut.NumChannels; - for(i = 0;i < 4;i++) - ComputePanGains(&device->FOAOut, IdentityMatrixf.m[i], slot->Params.Gain, state->Gain[i]); -} - -static ALvoid ALcompressorState_process(ALcompressorState *state, ALsizei SamplesToDo, const ALfloat (*RESTRICT SamplesIn)[BUFFERSIZE], ALfloat (*RESTRICT SamplesOut)[BUFFERSIZE], ALsizei NumChannels) -{ - ALsizei i, j, k; - ALsizei base; - - for(base = 0;base < SamplesToDo;) - { - ALfloat gains[256]; - ALsizei td = mini(256, SamplesToDo-base); - ALfloat env = state->EnvFollower; - - /* Generate the per-sample gains from the signal envelope. */ - if(state->Enabled) - { - for(i = 0;i < td;++i) - { - /* Clamp the absolute amplitude to the defined envelope limits, - * then attack or release the envelope to reach it. - */ - ALfloat amplitude = clampf(fabsf(SamplesIn[0][base+i]), - AMP_ENVELOPE_MIN, AMP_ENVELOPE_MAX); - if(amplitude > env) - env = minf(env*state->AttackMult, amplitude); - else if(amplitude < env) - env = maxf(env*state->ReleaseMult, amplitude); - - /* Apply the reciprocal of the envelope to normalize the volume - * (compress the dynamic range). - */ - gains[i] = 1.0f / env; - } - } - else - { - /* Same as above, except the amplitude is forced to 1. This helps - * ensure smooth gain changes when the compressor is turned on and - * off. - */ - for(i = 0;i < td;++i) - { - ALfloat amplitude = 1.0f; - if(amplitude > env) - env = minf(env*state->AttackMult, amplitude); - else if(amplitude < env) - env = maxf(env*state->ReleaseMult, amplitude); - - gains[i] = 1.0f / env; - } - } - state->EnvFollower = env; - - /* Now compress the signal amplitude to output. */ - for(j = 0;j < MAX_EFFECT_CHANNELS;j++) - { - for(k = 0;k < NumChannels;k++) - { - ALfloat gain = state->Gain[j][k]; - if(!(fabsf(gain) > GAIN_SILENCE_THRESHOLD)) - continue; - - for(i = 0;i < td;i++) - SamplesOut[k][base+i] += SamplesIn[j][base+i] * gains[i] * gain; - } - } - - base += td; - } -} - - -typedef struct CompressorStateFactory { - DERIVE_FROM_TYPE(EffectStateFactory); -} CompressorStateFactory; - -static ALeffectState *CompressorStateFactory_create(CompressorStateFactory *UNUSED(factory)) -{ - ALcompressorState *state; - - NEW_OBJ0(state, ALcompressorState)(); - if(!state) return NULL; - - return STATIC_CAST(ALeffectState, state); -} - -DEFINE_EFFECTSTATEFACTORY_VTABLE(CompressorStateFactory); - -EffectStateFactory *CompressorStateFactory_getFactory(void) -{ - static CompressorStateFactory CompressorFactory = { { GET_VTABLE2(CompressorStateFactory, EffectStateFactory) } }; - - return STATIC_CAST(EffectStateFactory, &CompressorFactory); -} - - -void ALcompressor_setParami(ALeffect *effect, ALCcontext *context, ALenum param, ALint val) -{ - ALeffectProps *props = &effect->Props; - switch(param) - { - case AL_COMPRESSOR_ONOFF: - if(!(val >= AL_COMPRESSOR_MIN_ONOFF && val <= AL_COMPRESSOR_MAX_ONOFF)) - SETERR_RETURN(context, AL_INVALID_VALUE,, "Compressor state out of range"); - props->Compressor.OnOff = val; - break; - - default: - alSetError(context, AL_INVALID_ENUM, "Invalid compressor integer property 0x%04x", - param); - } -} -void ALcompressor_setParamiv(ALeffect *effect, ALCcontext *context, ALenum param, const ALint *vals) -{ ALcompressor_setParami(effect, context, param, vals[0]); } -void ALcompressor_setParamf(ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALfloat UNUSED(val)) -{ alSetError(context, AL_INVALID_ENUM, "Invalid compressor float property 0x%04x", param); } -void ALcompressor_setParamfv(ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, const ALfloat *UNUSED(vals)) -{ alSetError(context, AL_INVALID_ENUM, "Invalid compressor float-vector property 0x%04x", param); } - -void ALcompressor_getParami(const ALeffect *effect, ALCcontext *context, ALenum param, ALint *val) -{ - const ALeffectProps *props = &effect->Props; - switch(param) - { - case AL_COMPRESSOR_ONOFF: - *val = props->Compressor.OnOff; - break; - - default: - alSetError(context, AL_INVALID_ENUM, "Invalid compressor integer property 0x%04x", - param); - } -} -void ALcompressor_getParamiv(const ALeffect *effect, ALCcontext *context, ALenum param, ALint *vals) -{ ALcompressor_getParami(effect, context, param, vals); } -void ALcompressor_getParamf(const ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALfloat *UNUSED(val)) -{ alSetError(context, AL_INVALID_ENUM, "Invalid compressor float property 0x%04x", param); } -void ALcompressor_getParamfv(const ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALfloat *UNUSED(vals)) -{ alSetError(context, AL_INVALID_ENUM, "Invalid compressor float-vector property 0x%04x", param); } - -DEFINE_ALEFFECT_VTABLE(ALcompressor); |