diff options
Diffstat (limited to 'Alc')
| -rw-r--r-- | Alc/ALc.c | 7 | ||||
| -rw-r--r-- | Alc/effects/autowah.c | 266 |
2 files changed, 271 insertions, 2 deletions
@@ -555,9 +555,7 @@ static const struct { DECL(AL_EFFECT_VOCAL_MORPHER), #endif DECL(AL_EFFECT_RING_MODULATOR), -#if 0 DECL(AL_EFFECT_AUTOWAH), -#endif DECL(AL_EFFECT_COMPRESSOR), DECL(AL_EFFECT_EQUALIZER), DECL(AL_EFFECT_DEDICATED_LOW_FREQUENCY_EFFECT), @@ -658,6 +656,11 @@ static const struct { DECL(AL_DEDICATED_GAIN), + DECL(AL_AUTOWAH_ATTACK_TIME),
+ DECL(AL_AUTOWAH_RELEASE_TIME),
+ DECL(AL_AUTOWAH_RESONANCE),
+ DECL(AL_AUTOWAH_PEAK_GAIN), + DECL(AL_NUM_RESAMPLERS_SOFT), DECL(AL_DEFAULT_RESAMPLER_SOFT), DECL(AL_SOURCE_RESAMPLER_SOFT), diff --git a/Alc/effects/autowah.c b/Alc/effects/autowah.c new file mode 100644 index 00000000..e9dbf304 --- /dev/null +++ b/Alc/effects/autowah.c @@ -0,0 +1,266 @@ +/** + * OpenAL cross platform audio library + * Copyright (C) 2018 by Raul Herraiz. + * 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 "config.h" + +#include <math.h> +#include <stdlib.h> + +#include "alMain.h" +#include "alAuxEffectSlot.h" +#include "alError.h" +#include "alu.h" +#include "filters/defs.h" + +#define MIN_FREQ 20.0f +#define MAX_FREQ 2500.0f +#define Q_FACTOR 5.0f + + +typedef struct ALautowahState { + DERIVE_FROM_TYPE(ALeffectState); + + /* Effect parameters */ + ALfloat AttackRate; + ALfloat ReleaseRate; + ALfloat ResonanceGain; + ALfloat PeakGain; + ALfloat FreqMinNorm; + ALfloat BandwidthNorm; + ALfloat env_delay; + + BiquadFilter Filter; + + /*Effects buffers*/ + alignas(16) ALfloat BufferOut[BUFFERSIZE]; + + /* Effect gains for each output channel */ + ALfloat CurrentGains[MAX_OUTPUT_CHANNELS]; + ALfloat TargetGains[MAX_OUTPUT_CHANNELS]; +} ALautowahState; + +static ALvoid ALautowahState_Destruct(ALautowahState *state); +static ALboolean ALautowahState_deviceUpdate(ALautowahState *state, ALCdevice *device); +static ALvoid ALautowahState_update(ALautowahState *state, const ALCcontext *context, const ALeffectslot *slot, const ALeffectProps *props); +static ALvoid ALautowahState_process(ALautowahState *state, ALsizei SamplesToDo, const ALfloat (*restrict SamplesIn)[BUFFERSIZE], ALfloat (*restrict SamplesOut)[BUFFERSIZE], ALsizei NumChannels); +DECLARE_DEFAULT_ALLOCATORS(ALautowahState) + +DEFINE_ALEFFECTSTATE_VTABLE(ALautowahState); + +/*Envelope follewer described on the book: Audio Effects, Theory, Implementation and Application*/ +static inline ALfloat envelope_follower(ALautowahState *state, ALfloat SampleIn) +{ + ALfloat alpha, Sample; + + Sample = state->PeakGain*fabsf(SampleIn); + alpha = (Sample > state->env_delay) ? state->AttackRate : state->ReleaseRate; + state->env_delay = alpha*state->env_delay + (1.0f-alpha)*Sample; + + return state->env_delay; +} + +static void ALautowahState_Construct(ALautowahState *state) +{ + ALeffectState_Construct(STATIC_CAST(ALeffectState, state)); + SET_VTABLE2(ALautowahState, ALeffectState, state); +} + +static ALvoid ALautowahState_Destruct(ALautowahState *state) +{ + ALeffectState_Destruct(STATIC_CAST(ALeffectState,state)); +} + +static ALboolean ALautowahState_deviceUpdate(ALautowahState *state, ALCdevice *UNUSED(device)) +{ + /* (Re-)initializing parameters and clear the buffers. */ + state->AttackRate = 1.0f; + state->ReleaseRate = 1.0f; + state->ResonanceGain = 10.0f; + state->PeakGain = 4.5f; + state->FreqMinNorm = 4.5e-4f; + state->BandwidthNorm = 0.05f; + state->env_delay = 0.0f; + + BiquadFilter_clear(&state->Filter); + + memset(state->CurrentGains, 0, sizeof(state->CurrentGains)); + memset(state->TargetGains, 0, sizeof(state->TargetGains)); + + return AL_TRUE; +} + +static ALvoid ALautowahState_update(ALautowahState *state, const ALCcontext *context, const ALeffectslot *slot, const ALeffectProps *props) +{ + const ALCdevice *device = context->Device; + ALfloat coeffs[MAX_AMBI_COEFFS]; + ALfloat ReleaseTime; + + ReleaseTime = clampf(props->Autowah.ReleaseTime,0.001f,1.0f); + + state->AttackRate = expf(-1.0f/(props->Autowah.AttackTime*device->Frequency)); + state->ReleaseRate = expf(-1.0f/(ReleaseTime*device->Frequency)); + state->ResonanceGain = 10.0f/3.0f*log10f(props->Autowah.Resonance);/*0-20dB Resonance Peak gain*/ + state->PeakGain = 1.0f -log10f(props->Autowah.PeakGain/AL_AUTOWAH_MAX_PEAK_GAIN); + state->FreqMinNorm = MIN_FREQ/device->Frequency; + state->BandwidthNorm = (MAX_FREQ - MIN_FREQ)/device->Frequency; + + CalcAngleCoeffs(0.0f, 0.0f, 0.0f, coeffs); + ComputeDryPanGains(&device->Dry, coeffs, slot->Params.Gain, state->TargetGains); +} + +static ALvoid ALautowahState_process(ALautowahState *state, ALsizei SamplesToDo, const ALfloat (*restrict SamplesIn)[BUFFERSIZE], ALfloat (*restrict SamplesOut)[BUFFERSIZE], ALsizei NumChannels) +{ + ALfloat *restrict BufferOut = state->BufferOut; + ALsizei i; + + for(i = 0;i < SamplesToDo;i++) + { + ALfloat env_out, f0norm, temp; + + env_out = envelope_follower(state, SamplesIn[0][i]); + f0norm = state->BandwidthNorm*env_out + state->FreqMinNorm; + + BiquadFilter_setParams(&state->Filter, BiquadType_Peaking, state->ResonanceGain, + f0norm, 1.0f/Q_FACTOR); + BiquadFilter_process(&state->Filter, &temp, &SamplesIn[0][i], 1); + + BufferOut[i] = temp; + } + /* Now, mix the processed sound data to the output. */ + MixSamples(BufferOut, NumChannels, SamplesOut, state->CurrentGains, state->TargetGains, + SamplesToDo, 0, SamplesToDo); + +} + +typedef struct AutowahStateFactory { + DERIVE_FROM_TYPE(EffectStateFactory); +} AutowahStateFactory; + +static ALeffectState *AutowahStateFactory_create(AutowahStateFactory *UNUSED(factory)) +{ + ALautowahState *state; + + NEW_OBJ0(state, ALautowahState)(); + if(!state) return NULL; + + return STATIC_CAST(ALeffectState, state); +} + +DEFINE_EFFECTSTATEFACTORY_VTABLE(AutowahStateFactory); + +EffectStateFactory *AutowahStateFactory_getFactory(void) +{ + static AutowahStateFactory AutowahFactory = { { GET_VTABLE2(AutowahStateFactory, EffectStateFactory) } }; + + return STATIC_CAST(EffectStateFactory, &AutowahFactory); +} + +void ALautowah_setParamf(ALeffect *effect, ALCcontext *context, ALenum param, ALfloat val) +{ + ALeffectProps *props = &effect->Props; + switch(param) + { + case AL_AUTOWAH_ATTACK_TIME: + if(!(val >= AL_AUTOWAH_MIN_ATTACK_TIME && val <= AL_AUTOWAH_MAX_ATTACK_TIME)) + SETERR_RETURN(context, AL_INVALID_VALUE,,"Autowah attack time out of range"); + props->Autowah.AttackTime = val; + break; + + case AL_AUTOWAH_RELEASE_TIME: + if(!(val >= AL_AUTOWAH_MIN_RELEASE_TIME && val <= AL_AUTOWAH_MAX_RELEASE_TIME)) + SETERR_RETURN(context, AL_INVALID_VALUE,,"Autowah release time out of range"); + props->Autowah.ReleaseTime = val; + break; + + case AL_AUTOWAH_RESONANCE: + if(!(val >= AL_AUTOWAH_MIN_RESONANCE && val <= AL_AUTOWAH_MAX_RESONANCE)) + SETERR_RETURN(context, AL_INVALID_VALUE,,"Autowah resonance out of range"); + props->Autowah.Resonance = val; + break; + + case AL_AUTOWAH_PEAK_GAIN: + if(!(val >= AL_AUTOWAH_MIN_PEAK_GAIN && val <= AL_AUTOWAH_MAX_PEAK_GAIN)) + SETERR_RETURN(context, AL_INVALID_VALUE,,"Autowah peak gain out of range"); + props->Autowah.PeakGain = val; + break; + + default: + alSetError(context, AL_INVALID_ENUM, "Invalid autowah float property 0x%04x", param); + } +} + +void ALautowah_setParamfv(ALeffect *effect, ALCcontext *context, ALenum param, const ALfloat *vals) +{ + ALautowah_setParamf(effect, context, param, vals[0]); +} + +void ALautowah_setParami(ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALint UNUSED(val)) +{ + alSetError(context, AL_INVALID_ENUM, "Invalid autowah integer property 0x%04x", param); +} + +void ALautowah_setParamiv(ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, const ALint *UNUSED(vals)) +{ + alSetError(context, AL_INVALID_ENUM, "Invalid autowah integer vector property 0x%04x", param); +} + +void ALautowah_getParami(const ALeffect *effect, ALCcontext *context, ALenum param, ALint *val) +{ + alSetError(context, AL_INVALID_ENUM, "Invalid autowah integer property 0x%04x", param); +} +void ALautowah_getParamiv(const ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALint *UNUSED(vals)) +{ + alSetError(context, AL_INVALID_ENUM, "Invalid autowah integer vector property 0x%04x", param); +} + +void ALautowah_getParamf(const ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *val) +{ + + const ALeffectProps *props = &effect->Props; + switch(param) + { + case AL_AUTOWAH_ATTACK_TIME: + *val = props->Autowah.AttackTime; + break; + + case AL_AUTOWAH_RELEASE_TIME: + *val = props->Autowah.ReleaseTime; + break; + + case AL_AUTOWAH_RESONANCE: + *val = props->Autowah.Resonance; + break; + + case AL_AUTOWAH_PEAK_GAIN: + *val = props->Autowah.PeakGain; + break; + + default: + alSetError(context, AL_INVALID_ENUM, "Invalid autowah float property 0x%04x", param); + } + +} + +void ALautowah_getParamfv(const ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *vals) +{ + ALautowah_getParamf(effect, context, param, vals); +} + +DEFINE_ALEFFECT_VTABLE(ALautowah); |