1 files changed, 333 insertions, 0 deletions
diff --git a/Alc/effects/fshifter.cpp b/Alc/effects/fshifter.cpp
new file mode 100644
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--- /dev/null
+++ b/Alc/effects/fshifter.cpp
@@ -0,0 +1,333 @@
+/**
+ * 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"
+
+#include "alcomplex.h"
+
+#define HIL_SIZE 1024
+#define OVERSAMP (1<<2)
+
+#define HIL_STEP     (HIL_SIZE / OVERSAMP)
+#define FIFO_LATENCY (HIL_STEP * (OVERSAMP-1))
+
+
+struct ALfshifterState final : public ALeffectState {
+    /* Effect parameters */
+    ALsizei  count;
+    ALsizei  PhaseStep;
+    ALsizei  Phase;
+    ALdouble ld_sign;
+
+    /*Effects buffers*/ 
+    ALfloat   InFIFO[HIL_SIZE];
+    ALcomplex OutFIFO[HIL_SIZE];
+    ALcomplex OutputAccum[HIL_SIZE];
+    ALcomplex Analytic[HIL_SIZE];
+    ALcomplex Outdata[BUFFERSIZE];
+
+    alignas(16) ALfloat BufferOut[BUFFERSIZE];
+
+    /* Effect gains for each output channel */
+    ALfloat CurrentGains[MAX_OUTPUT_CHANNELS];
+    ALfloat TargetGains[MAX_OUTPUT_CHANNELS];
+};
+
+static ALvoid ALfshifterState_Destruct(ALfshifterState *state);
+static ALboolean ALfshifterState_deviceUpdate(ALfshifterState *state, ALCdevice *device);
+static ALvoid ALfshifterState_update(ALfshifterState *state, const ALCcontext *context, const ALeffectslot *slot, const ALeffectProps *props);
+static ALvoid ALfshifterState_process(ALfshifterState *state, ALsizei SamplesToDo, const ALfloat (*RESTRICT SamplesIn)[BUFFERSIZE], ALfloat (*RESTRICT SamplesOut)[BUFFERSIZE], ALsizei NumChannels);
+DECLARE_DEFAULT_ALLOCATORS(ALfshifterState)
+
+DEFINE_ALEFFECTSTATE_VTABLE(ALfshifterState);
+
+/* Define a Hann window, used to filter the HIL input and output. */
+alignas(16) static ALdouble HannWindow[HIL_SIZE];
+
+static void InitHannWindow(void)
+{
+    ALsizei i;
+
+    /* Create lookup table of the Hann window for the desired size, i.e. HIL_SIZE */
+    for(i = 0;i < HIL_SIZE>>1;i++)
+    {
+        ALdouble val = sin(M_PI * (ALdouble)i / (ALdouble)(HIL_SIZE-1));
+        HannWindow[i] = HannWindow[HIL_SIZE-1-i] = val * val;
+    }
+}
+
+static alonce_flag HannInitOnce = AL_ONCE_FLAG_INIT;
+
+static void ALfshifterState_Construct(ALfshifterState *state)
+{
+    new (state) ALfshifterState{};
+    ALeffectState_Construct(STATIC_CAST(ALeffectState, state));
+    SET_VTABLE2(ALfshifterState, ALeffectState, state);
+
+    alcall_once(&HannInitOnce, InitHannWindow);
+}
+
+static ALvoid ALfshifterState_Destruct(ALfshifterState *state)
+{
+    ALeffectState_Destruct(STATIC_CAST(ALeffectState,state));
+    state->~ALfshifterState();
+}
+
+static ALboolean ALfshifterState_deviceUpdate(ALfshifterState *state, ALCdevice *UNUSED(device))
+{
+    /* (Re-)initializing parameters and clear the buffers. */
+    state->count     = FIFO_LATENCY;
+    state->PhaseStep = 0;
+    state->Phase     = 0;
+    state->ld_sign   = 1.0;
+
+    memset(state->InFIFO,      0, sizeof(state->InFIFO));
+    memset(state->OutFIFO,     0, sizeof(state->OutFIFO));
+    memset(state->OutputAccum, 0, sizeof(state->OutputAccum));
+    memset(state->Analytic,    0, sizeof(state->Analytic));
+
+    memset(state->CurrentGains, 0, sizeof(state->CurrentGains));
+    memset(state->TargetGains,  0, sizeof(state->TargetGains));
+
+    return AL_TRUE;
+}
+
+static ALvoid ALfshifterState_update(ALfshifterState *state, const ALCcontext *context, const ALeffectslot *slot, const ALeffectProps *props)
+{
+    const ALCdevice *device = context->Device;
+    ALfloat coeffs[MAX_AMBI_COEFFS];
+    ALfloat step;
+
+    step = props->Fshifter.Frequency / (ALfloat)device->Frequency;
+    state->PhaseStep = fastf2i(minf(step, 0.5f) * FRACTIONONE);
+
+    switch(props->Fshifter.LeftDirection)
+    {
+        case AL_FREQUENCY_SHIFTER_DIRECTION_DOWN:
+            state->ld_sign = -1.0;
+            break;
+
+        case AL_FREQUENCY_SHIFTER_DIRECTION_UP:
+            state->ld_sign = 1.0;
+            break;
+
+        case AL_FREQUENCY_SHIFTER_DIRECTION_OFF:
+            state->Phase = 0;
+            state->PhaseStep = 0;
+            break;
+    }
+
+    CalcAngleCoeffs(0.0f, 0.0f, 0.0f, coeffs);
+    ComputePanGains(&device->Dry, coeffs, slot->Params.Gain, state->TargetGains);
+}
+
+static ALvoid ALfshifterState_process(ALfshifterState *state, ALsizei SamplesToDo, const ALfloat (*RESTRICT SamplesIn)[BUFFERSIZE], ALfloat (*RESTRICT SamplesOut)[BUFFERSIZE], ALsizei NumChannels)
+{
+    static const ALcomplex complex_zero = { 0.0, 0.0 };
+    ALfloat *RESTRICT BufferOut = state->BufferOut;
+    ALsizei j, k, base;
+
+    for(base = 0;base < SamplesToDo;)
+    {
+        ALsizei todo = mini(HIL_SIZE-state->count, SamplesToDo-base);
+
+        ASSUME(todo > 0);
+
+        /* Fill FIFO buffer with samples data */
+        k = state->count;
+        for(j = 0;j < todo;j++,k++)
+        {
+            state->InFIFO[k] = SamplesIn[0][base+j];
+            state->Outdata[base+j]  = state->OutFIFO[k-FIFO_LATENCY];
+        }
+        state->count += todo;
+        base += todo;
+
+        /* Check whether FIFO buffer is filled */
+        if(state->count < HIL_SIZE) continue;
+
+        state->count = FIFO_LATENCY;
+
+        /* Real signal windowing and store in Analytic buffer */
+        for(k = 0;k < HIL_SIZE;k++)
+        {
+            state->Analytic[k].Real = state->InFIFO[k] * HannWindow[k];
+            state->Analytic[k].Imag = 0.0;
+        }
+
+        /* Processing signal by Discrete Hilbert Transform (analytical signal). */
+        complex_hilbert(state->Analytic, HIL_SIZE);
+
+        /* Windowing and add to output accumulator */
+        for(k = 0;k < HIL_SIZE;k++)
+        {
+            state->OutputAccum[k].Real += 2.0/OVERSAMP*HannWindow[k]*state->Analytic[k].Real;
+            state->OutputAccum[k].Imag += 2.0/OVERSAMP*HannWindow[k]*state->Analytic[k].Imag;
+        }
+
+        /* Shift accumulator, input & output FIFO */
+        for(k = 0;k < HIL_STEP;k++) state->OutFIFO[k] = state->OutputAccum[k];
+        for(j = 0;k < HIL_SIZE;k++,j++) state->OutputAccum[j] = state->OutputAccum[k];
+        for(;j < HIL_SIZE;j++) state->OutputAccum[j] = complex_zero;
+        for(k = 0;k < FIFO_LATENCY;k++)
+            state->InFIFO[k] = state->InFIFO[k+HIL_STEP];
+    }
+
+    /* Process frequency shifter using the analytic signal obtained. */
+    for(k = 0;k < SamplesToDo;k++)
+    {
+        ALdouble phase = state->Phase * ((1.0/FRACTIONONE) * 2.0*M_PI);
+        BufferOut[k] = (ALfloat)(state->Outdata[k].Real*cos(phase) +
+                                 state->Outdata[k].Imag*sin(phase)*state->ld_sign);
+
+        state->Phase += state->PhaseStep;
+        state->Phase &= FRACTIONMASK;
+    }
+
+    /* Now, mix the processed sound data to the output. */
+    MixSamples(BufferOut, NumChannels, SamplesOut, state->CurrentGains, state->TargetGains,
+               maxi(SamplesToDo, 512), 0, SamplesToDo);
+}
+
+struct FshifterStateFactory final : public EffectStateFactory {
+    FshifterStateFactory() noexcept;
+};
+
+static ALeffectState *FshifterStateFactory_create(FshifterStateFactory *UNUSED(factory))
+{
+    ALfshifterState *state;
+
+    NEW_OBJ0(state, ALfshifterState)();
+    if(!state) return NULL;
+
+    return STATIC_CAST(ALeffectState, state);
+}
+
+DEFINE_EFFECTSTATEFACTORY_VTABLE(FshifterStateFactory);
+
+FshifterStateFactory::FshifterStateFactory() noexcept
+  : EffectStateFactory{GET_VTABLE2(FshifterStateFactory, EffectStateFactory)}
+{
+}
+
+EffectStateFactory *FshifterStateFactory_getFactory(void)
+{
+    static FshifterStateFactory FshifterFactory{};
+    return STATIC_CAST(EffectStateFactory, &FshifterFactory);
+}
+
+void ALfshifter_setParamf(ALeffect *effect, ALCcontext *context, ALenum param, ALfloat val)
+{
+    ALeffectProps *props = &effect->Props;
+    switch(param)
+    {
+        case AL_FREQUENCY_SHIFTER_FREQUENCY:
+            if(!(val >= AL_FREQUENCY_SHIFTER_MIN_FREQUENCY && val <= AL_FREQUENCY_SHIFTER_MAX_FREQUENCY))
+                SETERR_RETURN(context, AL_INVALID_VALUE,,"Frequency shifter frequency out of range");
+            props->Fshifter.Frequency = val;
+            break;
+
+        default:
+            alSetError(context, AL_INVALID_ENUM, "Invalid frequency shifter float property 0x%04x", param);
+    }
+}
+
+void ALfshifter_setParamfv(ALeffect *effect, ALCcontext *context, ALenum param, const ALfloat *vals)
+{
+    ALfshifter_setParamf(effect, context, param, vals[0]);
+}
+
+void ALfshifter_setParami(ALeffect *effect, ALCcontext *context, ALenum param, ALint val)
+{
+    ALeffectProps *props = &effect->Props;
+    switch(param)
+    {
+        case AL_FREQUENCY_SHIFTER_LEFT_DIRECTION:
+            if(!(val >= AL_FREQUENCY_SHIFTER_MIN_LEFT_DIRECTION && val <= AL_FREQUENCY_SHIFTER_MAX_LEFT_DIRECTION))
+                SETERR_RETURN(context, AL_INVALID_VALUE,,"Frequency shifter left direction out of range");
+            props->Fshifter.LeftDirection = val;
+            break;
+
+        case AL_FREQUENCY_SHIFTER_RIGHT_DIRECTION:
+            if(!(val >= AL_FREQUENCY_SHIFTER_MIN_RIGHT_DIRECTION && val <= AL_FREQUENCY_SHIFTER_MAX_RIGHT_DIRECTION))
+                SETERR_RETURN(context, AL_INVALID_VALUE,,"Frequency shifter right direction out of range");
+            props->Fshifter.RightDirection = val;
+            break;
+
+        default:
+            alSetError(context, AL_INVALID_ENUM, "Invalid frequency shifter integer property 0x%04x", param);
+    }
+}
+void ALfshifter_setParamiv(ALeffect *effect, ALCcontext *context, ALenum param, const ALint *vals)
+{
+    ALfshifter_setParami(effect, context, param, vals[0]);
+}
+
+void ALfshifter_getParami(const ALeffect *effect, ALCcontext *context, ALenum param, ALint *val)
+{
+    const ALeffectProps *props = &effect->Props;
+    switch(param)
+    {
+        case AL_FREQUENCY_SHIFTER_LEFT_DIRECTION:
+            *val = props->Fshifter.LeftDirection;
+            break;
+        case AL_FREQUENCY_SHIFTER_RIGHT_DIRECTION:
+            *val = props->Fshifter.RightDirection;
+            break;
+        default:
+            alSetError(context, AL_INVALID_ENUM, "Invalid frequency shifter integer property 0x%04x", param);
+    }
+}
+void ALfshifter_getParamiv(const ALeffect *effect, ALCcontext *context, ALenum param, ALint *vals)
+{
+    ALfshifter_getParami(effect, context, param, vals);
+}
+
+void ALfshifter_getParamf(const ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *val)
+{
+
+    const ALeffectProps *props = &effect->Props;
+    switch(param)
+    {
+        case AL_FREQUENCY_SHIFTER_FREQUENCY:
+            *val = props->Fshifter.Frequency;
+            break;
+
+        default:
+            alSetError(context, AL_INVALID_ENUM, "Invalid frequency shifter float property 0x%04x", param);
+    }
+
+}
+
+void ALfshifter_getParamfv(const ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *vals)
+{
+    ALfshifter_getParamf(effect, context, param, vals);
+}
+
+DEFINE_ALEFFECT_VTABLE(ALfshifter);