diff options
Diffstat (limited to 'Alc/effects/flanger.c')
| -rw-r--r-- | Alc/effects/flanger.c | 398 |
1 files changed, 0 insertions, 398 deletions
diff --git a/Alc/effects/flanger.c b/Alc/effects/flanger.c deleted file mode 100644 index f6191abd..00000000 --- a/Alc/effects/flanger.c +++ /dev/null @@ -1,398 +0,0 @@ -/** - * OpenAL cross platform audio library - * Copyright (C) 2013 by Mike Gorchak - * 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 "alFilter.h" -#include "alAuxEffectSlot.h" -#include "alError.h" -#include "alu.h" - - -enum FlangerWaveForm { - FWF_Triangle = AL_FLANGER_WAVEFORM_TRIANGLE, - FWF_Sinusoid = AL_FLANGER_WAVEFORM_SINUSOID -}; - -typedef struct ALflangerState { - DERIVE_FROM_TYPE(ALeffectState); - - ALfloat *SampleBuffer[2]; - ALuint BufferLength; - ALuint offset; - ALuint lfo_range; - ALfloat lfo_scale; - ALint lfo_disp; - - /* Gains for left and right sides */ - ALfloat Gain[2][MAX_OUTPUT_CHANNELS]; - - /* effect parameters */ - enum FlangerWaveForm waveform; - ALint delay; - ALfloat depth; - ALfloat feedback; -} ALflangerState; - -static ALvoid ALflangerState_Destruct(ALflangerState *state) -{ - free(state->SampleBuffer[0]); - state->SampleBuffer[0] = NULL; - state->SampleBuffer[1] = NULL; -} - -static ALboolean ALflangerState_deviceUpdate(ALflangerState *state, ALCdevice *Device) -{ - ALuint maxlen; - ALuint it; - - maxlen = fastf2u(AL_FLANGER_MAX_DELAY * 3.0f * Device->Frequency) + 1; - maxlen = NextPowerOf2(maxlen); - - if(maxlen != state->BufferLength) - { - void *temp; - - temp = realloc(state->SampleBuffer[0], maxlen * sizeof(ALfloat) * 2); - if(!temp) return AL_FALSE; - state->SampleBuffer[0] = temp; - state->SampleBuffer[1] = state->SampleBuffer[0] + maxlen; - - state->BufferLength = maxlen; - } - - for(it = 0;it < state->BufferLength;it++) - { - state->SampleBuffer[0][it] = 0.0f; - state->SampleBuffer[1][it] = 0.0f; - } - - return AL_TRUE; -} - -static ALvoid ALflangerState_update(ALflangerState *state, ALCdevice *Device, const ALeffectslot *Slot) -{ - static const ALfloat left_dir[3] = { -1.0f, 0.0f, 0.0f }; - static const ALfloat right_dir[3] = { 1.0f, 0.0f, 0.0f }; - ALfloat frequency = (ALfloat)Device->Frequency; - ALfloat rate; - ALint phase; - - switch(Slot->EffectProps.Flanger.Waveform) - { - case AL_FLANGER_WAVEFORM_TRIANGLE: - state->waveform = FWF_Triangle; - break; - case AL_FLANGER_WAVEFORM_SINUSOID: - state->waveform = FWF_Sinusoid; - break; - } - state->depth = Slot->EffectProps.Flanger.Depth; - state->feedback = Slot->EffectProps.Flanger.Feedback; - state->delay = fastf2i(Slot->EffectProps.Flanger.Delay * frequency); - - /* Gains for left and right sides */ - ComputeDirectionalGains(Device, left_dir, Slot->Gain, state->Gain[0]); - ComputeDirectionalGains(Device, right_dir, Slot->Gain, state->Gain[1]); - - phase = Slot->EffectProps.Flanger.Phase; - rate = Slot->EffectProps.Flanger.Rate; - if(!(rate > 0.0f)) - { - state->lfo_scale = 0.0f; - state->lfo_range = 1; - state->lfo_disp = 0; - } - else - { - /* Calculate LFO coefficient */ - state->lfo_range = fastf2u(frequency/rate + 0.5f); - switch(state->waveform) - { - case FWF_Triangle: - state->lfo_scale = 4.0f / state->lfo_range; - break; - case FWF_Sinusoid: - state->lfo_scale = F_TAU / state->lfo_range; - break; - } - - /* Calculate lfo phase displacement */ - state->lfo_disp = fastf2i(state->lfo_range * (phase/360.0f)); - } -} - -static inline void Triangle(ALint *delay_left, ALint *delay_right, ALuint offset, const ALflangerState *state) -{ - ALfloat lfo_value; - - lfo_value = 2.0f - fabsf(2.0f - state->lfo_scale*(offset%state->lfo_range)); - lfo_value *= state->depth * state->delay; - *delay_left = fastf2i(lfo_value) + state->delay; - - offset += state->lfo_disp; - lfo_value = 2.0f - fabsf(2.0f - state->lfo_scale*(offset%state->lfo_range)); - lfo_value *= state->depth * state->delay; - *delay_right = fastf2i(lfo_value) + state->delay; -} - -static inline void Sinusoid(ALint *delay_left, ALint *delay_right, ALuint offset, const ALflangerState *state) -{ - ALfloat lfo_value; - - lfo_value = 1.0f + sinf(state->lfo_scale*(offset%state->lfo_range)); - lfo_value *= state->depth * state->delay; - *delay_left = fastf2i(lfo_value) + state->delay; - - offset += state->lfo_disp; - lfo_value = 1.0f + sinf(state->lfo_scale*(offset%state->lfo_range)); - lfo_value *= state->depth * state->delay; - *delay_right = fastf2i(lfo_value) + state->delay; -} - -#define DECL_TEMPLATE(Func) \ -static void Process##Func(ALflangerState *state, const ALuint SamplesToDo, \ - const ALfloat *restrict SamplesIn, ALfloat (*restrict out)[2]) \ -{ \ - const ALuint bufmask = state->BufferLength-1; \ - ALfloat *restrict leftbuf = state->SampleBuffer[0]; \ - ALfloat *restrict rightbuf = state->SampleBuffer[1]; \ - ALuint offset = state->offset; \ - const ALfloat feedback = state->feedback; \ - ALuint it; \ - \ - for(it = 0;it < SamplesToDo;it++) \ - { \ - ALint delay_left, delay_right; \ - Func(&delay_left, &delay_right, offset, state); \ - \ - out[it][0] = leftbuf[(offset-delay_left)&bufmask]; \ - leftbuf[offset&bufmask] = (out[it][0]+SamplesIn[it]) * feedback; \ - \ - out[it][1] = rightbuf[(offset-delay_right)&bufmask]; \ - rightbuf[offset&bufmask] = (out[it][1]+SamplesIn[it]) * feedback; \ - \ - offset++; \ - } \ - state->offset = offset; \ -} - -DECL_TEMPLATE(Triangle) -DECL_TEMPLATE(Sinusoid) - -#undef DECL_TEMPLATE - -static ALvoid ALflangerState_process(ALflangerState *state, ALuint SamplesToDo, const ALfloat *restrict SamplesIn, ALfloat (*restrict SamplesOut)[BUFFERSIZE], ALuint NumChannels) -{ - ALuint it, kt; - ALuint base; - - for(base = 0;base < SamplesToDo;) - { - ALfloat temps[128][2]; - ALuint td = minu(128, SamplesToDo-base); - - switch(state->waveform) - { - case FWF_Triangle: - ProcessTriangle(state, td, SamplesIn+base, temps); - break; - case FWF_Sinusoid: - ProcessSinusoid(state, td, SamplesIn+base, temps); - break; - } - - for(kt = 0;kt < NumChannels;kt++) - { - ALfloat gain = state->Gain[0][kt]; - if(fabsf(gain) > GAIN_SILENCE_THRESHOLD) - { - for(it = 0;it < td;it++) - SamplesOut[kt][it+base] += temps[it][0] * gain; - } - - gain = state->Gain[1][kt]; - if(fabsf(gain) > GAIN_SILENCE_THRESHOLD) - { - for(it = 0;it < td;it++) - SamplesOut[kt][it+base] += temps[it][1] * gain; - } - } - - base += td; - } -} - -DECLARE_DEFAULT_ALLOCATORS(ALflangerState) - -DEFINE_ALEFFECTSTATE_VTABLE(ALflangerState); - - -typedef struct ALflangerStateFactory { - DERIVE_FROM_TYPE(ALeffectStateFactory); -} ALflangerStateFactory; - -ALeffectState *ALflangerStateFactory_create(ALflangerStateFactory *UNUSED(factory)) -{ - ALflangerState *state; - - state = ALflangerState_New(sizeof(*state)); - if(!state) return NULL; - SET_VTABLE2(ALflangerState, ALeffectState, state); - - state->BufferLength = 0; - state->SampleBuffer[0] = NULL; - state->SampleBuffer[1] = NULL; - state->offset = 0; - state->lfo_range = 1; - state->waveform = FWF_Triangle; - - return STATIC_CAST(ALeffectState, state); -} - -DEFINE_ALEFFECTSTATEFACTORY_VTABLE(ALflangerStateFactory); - -ALeffectStateFactory *ALflangerStateFactory_getFactory(void) -{ - static ALflangerStateFactory FlangerFactory = { { GET_VTABLE2(ALflangerStateFactory, ALeffectStateFactory) } }; - - return STATIC_CAST(ALeffectStateFactory, &FlangerFactory); -} - - -void ALflanger_setParami(ALeffect *effect, ALCcontext *context, ALenum param, ALint val) -{ - ALeffectProps *props = &effect->Props; - switch(param) - { - case AL_FLANGER_WAVEFORM: - if(!(val >= AL_FLANGER_MIN_WAVEFORM && val <= AL_FLANGER_MAX_WAVEFORM)) - SET_ERROR_AND_RETURN(context, AL_INVALID_VALUE); - props->Flanger.Waveform = val; - break; - - case AL_FLANGER_PHASE: - if(!(val >= AL_FLANGER_MIN_PHASE && val <= AL_FLANGER_MAX_PHASE)) - SET_ERROR_AND_RETURN(context, AL_INVALID_VALUE); - props->Flanger.Phase = val; - break; - - default: - SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM); - } -} -void ALflanger_setParamiv(ALeffect *effect, ALCcontext *context, ALenum param, const ALint *vals) -{ - ALflanger_setParami(effect, context, param, vals[0]); -} -void ALflanger_setParamf(ALeffect *effect, ALCcontext *context, ALenum param, ALfloat val) -{ - ALeffectProps *props = &effect->Props; - switch(param) - { - case AL_FLANGER_RATE: - if(!(val >= AL_FLANGER_MIN_RATE && val <= AL_FLANGER_MAX_RATE)) - SET_ERROR_AND_RETURN(context, AL_INVALID_VALUE); - props->Flanger.Rate = val; - break; - - case AL_FLANGER_DEPTH: - if(!(val >= AL_FLANGER_MIN_DEPTH && val <= AL_FLANGER_MAX_DEPTH)) - SET_ERROR_AND_RETURN(context, AL_INVALID_VALUE); - props->Flanger.Depth = val; - break; - - case AL_FLANGER_FEEDBACK: - if(!(val >= AL_FLANGER_MIN_FEEDBACK && val <= AL_FLANGER_MAX_FEEDBACK)) - SET_ERROR_AND_RETURN(context, AL_INVALID_VALUE); - props->Flanger.Feedback = val; - break; - - case AL_FLANGER_DELAY: - if(!(val >= AL_FLANGER_MIN_DELAY && val <= AL_FLANGER_MAX_DELAY)) - SET_ERROR_AND_RETURN(context, AL_INVALID_VALUE); - props->Flanger.Delay = val; - break; - - default: - SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM); - } -} -void ALflanger_setParamfv(ALeffect *effect, ALCcontext *context, ALenum param, const ALfloat *vals) -{ - ALflanger_setParamf(effect, context, param, vals[0]); -} - -void ALflanger_getParami(const ALeffect *effect, ALCcontext *context, ALenum param, ALint *val) -{ - const ALeffectProps *props = &effect->Props; - switch(param) - { - case AL_FLANGER_WAVEFORM: - *val = props->Flanger.Waveform; - break; - - case AL_FLANGER_PHASE: - *val = props->Flanger.Phase; - break; - - default: - SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM); - } -} -void ALflanger_getParamiv(const ALeffect *effect, ALCcontext *context, ALenum param, ALint *vals) -{ - ALflanger_getParami(effect, context, param, vals); -} -void ALflanger_getParamf(const ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *val) -{ - const ALeffectProps *props = &effect->Props; - switch(param) - { - case AL_FLANGER_RATE: - *val = props->Flanger.Rate; - break; - - case AL_FLANGER_DEPTH: - *val = props->Flanger.Depth; - break; - - case AL_FLANGER_FEEDBACK: - *val = props->Flanger.Feedback; - break; - - case AL_FLANGER_DELAY: - *val = props->Flanger.Delay; - break; - - default: - SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM); - } -} -void ALflanger_getParamfv(const ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *vals) -{ - ALflanger_getParamf(effect, context, param, vals); -} - -DEFINE_ALEFFECT_VTABLE(ALflanger); |