vocal morpher implementation (#312)

* vocal morpher implementation

* compile fix for GCC

6 files changed, 506 insertions, 4 deletions

diff --git a/Alc/alc.cpp b/Alc/alc.cpp
index 7efa8514..3e176957 100644
--- a/Alc/alc.cpp
+++ b/Alc/alc.cpp
@@ -617,9 +617,7 @@ constexpr struct {
     DECL(AL_EFFECT_FLANGER),
     DECL(AL_EFFECT_PITCH_SHIFTER),
     DECL(AL_EFFECT_FREQUENCY_SHIFTER),
-#if 0
     DECL(AL_EFFECT_VOCAL_MORPHER),
-#endif
     DECL(AL_EFFECT_RING_MODULATOR),
     DECL(AL_EFFECT_AUTOWAH),
     DECL(AL_EFFECT_COMPRESSOR),
diff --git a/Alc/effects/base.h b/Alc/effects/base.h
index c2848f37..2b067f11 100644
--- a/Alc/effects/base.h
+++ b/Alc/effects/base.h
@@ -110,6 +110,15 @@ union EffectProps {
     } Pshifter;
 
     struct {
+        ALfloat Rate;
+        ALint PhonemeA;
+        ALint PhonemeB;
+        ALint PhonemeACoarseTuning;
+        ALint PhonemeBCoarseTuning;
+        ALint Waveform;
+    } Vmorpher;
+
+    struct {
         ALfloat Gain;
     } Dedicated;
 };
@@ -180,6 +189,7 @@ EffectStateFactory *FlangerStateFactory_getFactory(void);
 EffectStateFactory *FshifterStateFactory_getFactory(void);
 EffectStateFactory *ModulatorStateFactory_getFactory(void);
 EffectStateFactory *PshifterStateFactory_getFactory(void);
+EffectStateFactory* VmorpherStateFactory_getFactory(void);
 
 EffectStateFactory *DedicatedStateFactory_getFactory(void);
 
diff --git a/Alc/effects/vmorpher.cpp b/Alc/effects/vmorpher.cpp
new file mode 100644
index 00000000..c656a14e
--- /dev/null
+++ b/Alc/effects/vmorpher.cpp
@@ -0,0 +1,490 @@
+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 2019 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 "config.h"
+
+#include <cmath>
+#include <cstdlib>
+
+#include <algorithm>
+#include <functional>
+
+#include "alMain.h"
+#include "alcontext.h"
+#include "alAuxEffectSlot.h"
+#include "alError.h"
+#include "alu.h"
+#include "vecmat.h"
+
+
+namespace {
+
+#define MAX_UPDATE_SAMPLES 128
+#define Q_FACTOR 5.0f
+#define NUM_FORMANTS 4
+
+#define WAVEFORM_FRACBITS  24
+#define WAVEFORM_FRACONE   (1<<WAVEFORM_FRACBITS)
+#define WAVEFORM_FRACMASK  (WAVEFORM_FRACONE-1)
+
+inline ALfloat Sin(ALsizei index)
+{
+    return (std::sin(static_cast<ALfloat>(index) *
+        (al::MathDefs<float>::Tau() / ALfloat{WAVEFORM_FRACONE})))*0.5f+0.5f;
+}
+
+inline ALfloat Saw(ALsizei index)
+{
+    return (static_cast<ALfloat>(index)*(2.0f/WAVEFORM_FRACONE) - 1.0f)*0.5f+0.5f;
+}
+
+inline ALfloat Triangle(ALsizei index)
+{
+    return (std::fabs(static_cast<ALfloat>(index) * (al::MathDefs<float>::Tau() / WAVEFORM_FRACONE) -
+        al::MathDefs<float>::Pi()) / al::MathDefs<float>::Pi())*0.5f+0.5f;
+}
+
+inline ALfloat Half(ALsizei UNUSED(index))
+{
+    return 0.5f;
+}
+
+template<ALfloat func(ALsizei)>
+void Oscillate(ALfloat *RESTRICT dst, ALsizei index, const ALsizei step, ALsizei todo)
+{
+    for(ALsizei i{0};i < todo;i++)
+    {
+        index += step;
+        index &= WAVEFORM_FRACMASK;
+        dst[i] = func(index);
+    }
+}
+
+struct FormantFilter
+{
+    inline void process(const ALfloat* samplesIn, ALfloat* samplesOut, const ALsizei numInput)
+    {
+        const float g = std::tan(al::MathDefs<float>::Pi() * f0norm);
+        const float h = 1.0f / (1 + (g / Q_FACTOR) + (g * g));
+
+        for (ALsizei i{0};i < numInput;i++)
+        {
+            const float H = h * (samplesIn[i] - (1.0f / Q_FACTOR + g) * s1 - s2);
+            const float B = g * H + s1;
+            const float L = g * B + s2;
+
+            s1 = g * H + B;
+            s2 = g * B + L;
+
+            // Apply peak and accumulate samples.
+            samplesOut[i] += B * fGain;
+        }
+    }
+
+    inline void clear()
+    {
+        s1 = 0.0f;
+        s2 = 0.0f;
+    }
+
+    float f0norm;
+    float fGain;
+    float s1;
+    float s2;
+};
+
+struct VmorpherState final : public EffectState {
+    struct {
+        /* Effect parameters */
+        FormantFilter FormantsA[NUM_FORMANTS];
+        FormantFilter FormantsB[NUM_FORMANTS];
+
+        /* Effect gains for each channel */
+        ALfloat CurrentGains[MAX_OUTPUT_CHANNELS]{};
+        ALfloat TargetGains[MAX_OUTPUT_CHANNELS]{};
+    } mChans[MAX_AMBI_CHANNELS];
+
+    void (*mGetSamples)(ALfloat* RESTRICT, ALsizei, const ALsizei, ALsizei) {};
+
+    ALsizei mIndex{0};
+    ALsizei mStep{1};
+
+    ALfloat mSampleBufferA[MAX_UPDATE_SAMPLES]{};
+    ALfloat mSampleBufferB[MAX_UPDATE_SAMPLES]{};
+
+    ALboolean deviceUpdate(const ALCdevice *device) override;
+    void update(const ALCcontext *context, const ALeffectslot *slot, const EffectProps *props, const EffectTarget target) override;
+    void process(const ALsizei samplesToDo, const FloatBufferLine *RESTRICT samplesIn, const ALsizei numInput, const al::span<FloatBufferLine> samplesOut) override;
+
+    DEF_NEWDEL(VmorpherState)
+};
+
+ALboolean VmorpherState::deviceUpdate(const ALCdevice *UNUSED(device))
+{
+    for(auto &e : mChans)
+    {
+        std::for_each(std::begin(e.FormantsA), std::end(e.FormantsA),
+                      std::mem_fn(&FormantFilter::clear));
+        std::for_each(std::begin(e.FormantsB), std::end(e.FormantsB),
+                      std::mem_fn(&FormantFilter::clear));
+        std::fill(std::begin(e.CurrentGains), std::end(e.CurrentGains), 0.0f);
+    }
+    return AL_TRUE;
+}
+
+void VmorpherState::update(const ALCcontext *context, const ALeffectslot *slot, const EffectProps *props, const EffectTarget target)
+{
+    const ALCdevice *device = context->Device;
+    const ALfloat frequency = static_cast<ALfloat>(device->Frequency);
+
+    const float step{props->Vmorpher.Rate / static_cast<ALfloat>(device->Frequency)};
+    mStep = fastf2i(clampf(step*WAVEFORM_FRACONE, 0.0f, ALfloat{WAVEFORM_FRACONE-1}));
+
+    if(mStep == 0)
+        mGetSamples = Oscillate<Half>;
+    else if(props->Vmorpher.Waveform == AL_VOCAL_MORPHER_WAVEFORM_SINUSOID)
+        mGetSamples = Oscillate<Sin>;
+    else if(props->Vmorpher.Waveform == AL_VOCAL_MORPHER_WAVEFORM_SAWTOOTH)
+        mGetSamples = Oscillate<Saw>;
+    else /*if(props->Vmorpher.Waveform == AL_VOCAL_MORPHER_WAVEFORM_TRIANGLE)*/
+        mGetSamples = Oscillate<Triangle>;
+
+    /* Using soprano formant set of values to better match mid-range frequency space.
+     * See: https://www.classes.cs.uchicago.edu/archive/1999/spring/CS295/Computing_Resources/Csound/CsManual3.48b1.HTML/Appendices/table3.html
+     */
+    switch(props->Vmorpher.PhonemeA)
+    {
+        case AL_VOCAL_MORPHER_PHONEME_A:
+            mChans[0].FormantsA[0].f0norm = 800  / frequency;
+            mChans[0].FormantsA[1].f0norm = 1150 / frequency;
+            mChans[0].FormantsA[2].f0norm = 2900 / frequency;
+            mChans[0].FormantsA[3].f0norm = 3900 / frequency;
+
+            mChans[0].FormantsA[0].fGain = 1.000000f; /* std::pow(10.0f,   0 / 20.0f); */
+            mChans[0].FormantsA[1].fGain = 0.501187f; /* std::pow(10.0f,  -6 / 20.0f); */
+            mChans[0].FormantsA[2].fGain = 0.025118f; /* std::pow(10.0f, -32 / 20.0f); */
+            mChans[0].FormantsA[3].fGain = 0.100000f; /* std::pow(10.0f, -20 / 20.0f); */
+            break;
+        case AL_VOCAL_MORPHER_PHONEME_E:
+            mChans[0].FormantsA[0].f0norm = 350  / frequency;
+            mChans[0].FormantsA[1].f0norm = 2000 / frequency;
+            mChans[0].FormantsA[2].f0norm = 2800 / frequency;
+            mChans[0].FormantsA[3].f0norm = 3600 / frequency;
+
+            mChans[0].FormantsA[0].fGain = 1.000000f; /* std::pow(10.0f,   0 / 20.0f); */
+            mChans[0].FormantsA[1].fGain = 0.100000f; /* std::pow(10.0f, -20 / 20.0f); */
+            mChans[0].FormantsA[2].fGain = 0.177827f; /* std::pow(10.0f, -15 / 20.0f); */
+            mChans[0].FormantsA[3].fGain = 0.009999f; /* std::pow(10.0f, -40 / 20.0f); */
+            break;
+        case AL_VOCAL_MORPHER_PHONEME_I:
+            mChans[0].FormantsA[0].f0norm = 270  / frequency;
+            mChans[0].FormantsA[1].f0norm = 2140 / frequency;
+            mChans[0].FormantsA[2].f0norm = 2950 / frequency;
+            mChans[0].FormantsA[3].f0norm = 3900 / frequency;
+
+            mChans[0].FormantsA[0].fGain = 1.000000f; /* std::pow(10.0f,   0 / 20.0f); */
+            mChans[0].FormantsA[1].fGain = 0.251188f; /* std::pow(10.0f, -12 / 20.0f); */
+            mChans[0].FormantsA[2].fGain = 0.050118f; /* std::pow(10.0f, -26 / 20.0f); */
+            mChans[0].FormantsA[3].fGain = 0.050118f; /* std::pow(10.0f, -26 / 20.0f); */
+            break;
+        case AL_VOCAL_MORPHER_PHONEME_O:
+            mChans[0].FormantsA[0].f0norm = 450  / frequency;
+            mChans[0].FormantsA[1].f0norm = 800  / frequency;
+            mChans[0].FormantsA[2].f0norm = 2830 / frequency;
+            mChans[0].FormantsA[3].f0norm = 3800 / frequency;
+
+            mChans[0].FormantsA[0].fGain = 1.000000f; /* std::pow(10.0f,   0 / 20.0f); */
+            mChans[0].FormantsA[1].fGain = 0.281838f; /* std::pow(10.0f, -11 / 20.0f); */
+            mChans[0].FormantsA[2].fGain = 0.079432f; /* std::pow(10.0f, -22 / 20.0f); */
+            mChans[0].FormantsA[3].fGain = 0.079432f; /* std::pow(10.0f, -22 / 20.0f); */
+            break;
+        case AL_VOCAL_MORPHER_PHONEME_U:
+            mChans[0].FormantsA[0].f0norm = 325  / frequency;
+            mChans[0].FormantsA[1].f0norm = 700  / frequency;
+            mChans[0].FormantsA[2].f0norm = 2700 / frequency;
+            mChans[0].FormantsA[3].f0norm = 3800 / frequency;
+
+            mChans[0].FormantsA[0].fGain = 1.000000f; /* std::pow(10.0f,   0 / 20.0f); */
+            mChans[0].FormantsA[1].fGain = 0.158489f; /* std::pow(10.0f, -16 / 20.0f); */
+            mChans[0].FormantsA[2].fGain = 0.017782f; /* std::pow(10.0f, -35 / 20.0f); */
+            mChans[0].FormantsA[3].fGain = 0.009999f; /* std::pow(10.0f, -40 / 20.0f); */
+            break;
+    }
+
+    switch(props->Vmorpher.PhonemeB)
+    {
+        case AL_VOCAL_MORPHER_PHONEME_A:
+            mChans[0].FormantsB[0].f0norm = 800  / frequency;
+            mChans[0].FormantsB[1].f0norm = 1150 / frequency;
+            mChans[0].FormantsB[2].f0norm = 2900 / frequency;
+            mChans[0].FormantsB[3].f0norm = 3900 / frequency;
+
+            mChans[0].FormantsB[0].fGain = 1.000000f; /* std::pow(10.0f,   0 / 20.0f); */
+            mChans[0].FormantsB[1].fGain = 0.501187f; /* std::pow(10.0f,  -6 / 20.0f); */
+            mChans[0].FormantsB[2].fGain = 0.025118f; /* std::pow(10.0f, -32 / 20.0f); */
+            mChans[0].FormantsB[3].fGain = 0.100000f; /* std::pow(10.0f, -20 / 20.0f); */
+            break;
+        case AL_VOCAL_MORPHER_PHONEME_E:
+            mChans[0].FormantsB[0].f0norm = 350  / frequency;
+            mChans[0].FormantsB[1].f0norm = 2000 / frequency;
+            mChans[0].FormantsB[2].f0norm = 2800 / frequency;
+            mChans[0].FormantsB[3].f0norm = 3600 / frequency;
+
+            mChans[0].FormantsB[0].fGain = 1.000000f; /* std::pow(10.0f,   0 / 20.0f); */
+            mChans[0].FormantsB[1].fGain = 0.100000f; /* std::pow(10.0f, -20 / 20.0f); */
+            mChans[0].FormantsB[2].fGain = 0.177827f; /* std::pow(10.0f, -15 / 20.0f); */
+            mChans[0].FormantsB[3].fGain = 0.009999f; /* std::pow(10.0f, -40 / 20.0f); */
+            break;
+        case AL_VOCAL_MORPHER_PHONEME_I:
+            mChans[0].FormantsB[0].f0norm = 270  / frequency;
+            mChans[0].FormantsB[1].f0norm = 2140 / frequency;
+            mChans[0].FormantsB[2].f0norm = 2950 / frequency;
+            mChans[0].FormantsB[3].f0norm = 3900 / frequency;
+
+            mChans[0].FormantsB[0].fGain = 1.000000f; /* std::pow(10.0f,   0 / 20.0f); */
+            mChans[0].FormantsB[1].fGain = 0.251188f; /* std::pow(10.0f, -12 / 20.0f); */
+            mChans[0].FormantsB[2].fGain = 0.050118f; /* std::pow(10.0f, -26 / 20.0f); */
+            mChans[0].FormantsB[3].fGain = 0.050118f; /* std::pow(10.0f, -26 / 20.0f); */
+            break;
+        case AL_VOCAL_MORPHER_PHONEME_O:
+            mChans[0].FormantsB[0].f0norm = 450  / frequency;
+            mChans[0].FormantsB[1].f0norm = 800  / frequency;
+            mChans[0].FormantsB[2].f0norm = 2830 / frequency;
+            mChans[0].FormantsB[3].f0norm = 3800 / frequency;
+
+            mChans[0].FormantsB[0].fGain = 1.000000f; /* std::pow(10.0f,   0 / 20.0f); */
+            mChans[0].FormantsB[1].fGain = 0.281838f; /* std::pow(10.0f, -11 / 20.0f); */
+            mChans[0].FormantsB[2].fGain = 0.079432f; /* std::pow(10.0f, -22 / 20.0f); */
+            mChans[0].FormantsB[3].fGain = 0.079432f; /* std::pow(10.0f, -22 / 20.0f); */
+            break;
+        case AL_VOCAL_MORPHER_PHONEME_U:
+            mChans[0].FormantsB[0].f0norm = 325  / frequency;
+            mChans[0].FormantsB[1].f0norm = 700  / frequency;
+            mChans[0].FormantsB[2].f0norm = 2700 / frequency;
+            mChans[0].FormantsB[3].f0norm = 3800 / frequency;
+
+            mChans[0].FormantsB[0].fGain = 1.000000f; /* std::pow(10.0f,   0 / 20.0f); */
+            mChans[0].FormantsB[1].fGain = 0.158489f; /* std::pow(10.0f, -16 / 20.0f); */
+            mChans[0].FormantsB[2].fGain = 0.017782f; /* std::pow(10.0f, -35 / 20.0f); */
+            mChans[0].FormantsB[3].fGain = 0.009999f; /* std::pow(10.0f, -40 / 20.0f); */
+            break;
+    }
+
+    /* Copy the filter coefficients for the other input channels. */
+    for(ALuint i{1u};i < slot->Wet.Buffer.size();++i)
+    {
+        mChans[i].FormantsA[0] = mChans[0].FormantsA[0];
+        mChans[i].FormantsA[1] = mChans[0].FormantsA[0];
+        mChans[i].FormantsA[2] = mChans[0].FormantsA[0];
+        mChans[i].FormantsA[3] = mChans[0].FormantsA[0];
+
+        mChans[i].FormantsB[0] = mChans[0].FormantsB[0];
+        mChans[i].FormantsB[1] = mChans[0].FormantsB[0];
+        mChans[i].FormantsB[2] = mChans[0].FormantsB[0];
+        mChans[i].FormantsB[3] = mChans[0].FormantsB[0];
+    }
+
+    mOutTarget = target.Main->Buffer;
+    for(ALuint i{0u};i < slot->Wet.Buffer.size();++i)
+    {
+        auto coeffs = GetAmbiIdentityRow(i);
+        ComputePanGains(target.Main, coeffs.data(), slot->Params.Gain, mChans[i].TargetGains);
+    }
+}
+
+void VmorpherState::process(const ALsizei samplesToDo, const FloatBufferLine *RESTRICT samplesIn, const ALsizei numInput, const al::span<FloatBufferLine> samplesOut)
+{
+    /* Following the EFX specification for a conformant implementation which describes
+     * the effect as a pair of 4-band formant filters blended together using an LFO.
+     */
+    for(ALsizei base{0};base < samplesToDo;)
+    {
+        alignas(16) ALfloat lfo[MAX_UPDATE_SAMPLES];
+        const ALsizei td = mini(MAX_UPDATE_SAMPLES, samplesToDo-base);
+
+        mGetSamples(lfo, mIndex, mStep, td);
+        mIndex += (mStep * td) & WAVEFORM_FRACMASK;
+        mIndex &= WAVEFORM_FRACMASK;
+
+        ASSUME(numInput > 0);
+        for(ALsizei c{0};c < numInput;c++)
+        {
+            for (ALsizei i{0};i < td;i++)
+            {
+                mSampleBufferA[i] = 0.0f;
+                mSampleBufferB[i] = 0.0f;
+            }
+
+            /* Process first vowel. */
+            mChans[c].FormantsA[0].process(&samplesIn[c][base], mSampleBufferA, td);
+            mChans[c].FormantsA[1].process(&samplesIn[c][base], mSampleBufferA, td);
+            mChans[c].FormantsA[2].process(&samplesIn[c][base], mSampleBufferA, td);
+            mChans[c].FormantsA[3].process(&samplesIn[c][base], mSampleBufferA, td);
+
+            /* Process second vowel. */
+            mChans[c].FormantsB[0].process(&samplesIn[c][base], mSampleBufferB, td);
+            mChans[c].FormantsB[1].process(&samplesIn[c][base], mSampleBufferB, td);
+            mChans[c].FormantsB[2].process(&samplesIn[c][base], mSampleBufferB, td);
+            mChans[c].FormantsB[3].process(&samplesIn[c][base], mSampleBufferB, td);
+
+            alignas(16) ALfloat samplesBlended[MAX_UPDATE_SAMPLES];
+
+            for (ALsizei i{0};i < td;i++)
+                samplesBlended[i] = lerp(mSampleBufferA[i], mSampleBufferB[i], lfo[i]);
+
+            MixSamples(samplesBlended, samplesOut, mChans[c].CurrentGains, mChans[c].TargetGains,
+                samplesToDo-base, base, td);
+        }
+
+        base += td;
+    }
+}
+
+
+void Vmorpher_setParami(EffectProps* props, ALCcontext *context, ALenum param, ALint val)
+{
+    switch(param)
+    {
+        case AL_VOCAL_MORPHER_WAVEFORM:
+            if(val < AL_VOCAL_MORPHER_MIN_WAVEFORM || val > AL_VOCAL_MORPHER_MAX_WAVEFORM)
+                SETERR_RETURN(context, AL_INVALID_VALUE,, "Vocal morpher waveform out of range");
+            props->Vmorpher.Waveform = val;
+            break;
+
+        case AL_VOCAL_MORPHER_PHONEMEA:
+            if(val < AL_VOCAL_MORPHER_MIN_PHONEMEA || val > AL_VOCAL_MORPHER_MAX_PHONEMEA)
+                SETERR_RETURN(context, AL_INVALID_VALUE,, "Vocal morpher phoneme-a out of range");
+            props->Vmorpher.PhonemeA = val;
+            break;
+
+        case AL_VOCAL_MORPHER_PHONEMEB:
+            if(val < AL_VOCAL_MORPHER_MIN_PHONEMEB || val > AL_VOCAL_MORPHER_MAX_PHONEMEB)
+                SETERR_RETURN(context, AL_INVALID_VALUE,, "Vocal morpher phoneme-b out of range");
+            props->Vmorpher.PhonemeB = val;
+            break;
+
+        case AL_VOCAL_MORPHER_PHONEMEA_COARSE_TUNING:
+            if(val < AL_VOCAL_MORPHER_MIN_PHONEMEA_COARSE_TUNING || val > AL_VOCAL_MORPHER_MAX_PHONEMEA_COARSE_TUNING)
+                SETERR_RETURN(context, AL_INVALID_VALUE,, "Vocal morpher phoneme-a coarse tuning out of range");
+            props->Vmorpher.PhonemeACoarseTuning = val;
+            break;
+
+        case AL_VOCAL_MORPHER_PHONEMEB_COARSE_TUNING:
+            if(val < AL_VOCAL_MORPHER_MIN_PHONEMEB_COARSE_TUNING || val > AL_VOCAL_MORPHER_MAX_PHONEMEB_COARSE_TUNING)
+                SETERR_RETURN(context, AL_INVALID_VALUE,, "Vocal morpher phoneme-b coarse tuning out of range");
+            props->Vmorpher.PhonemeBCoarseTuning = val;
+            break;
+
+        default:
+            alSetError(context, AL_INVALID_ENUM, "Invalid vocal morpher integer property 0x%04x", param);
+    }
+}
+void Vmorpher_setParamiv(EffectProps*, ALCcontext *context, ALenum param, const ALint*)
+{ alSetError(context, AL_INVALID_ENUM, "Invalid vocal morpher integer-vector property 0x%04x", param); }
+void Vmorpher_setParamf(EffectProps *props, ALCcontext *context, ALenum param, ALfloat val)
+{
+    switch(param)
+    {
+        case AL_VOCAL_MORPHER_RATE:
+            if(val < AL_VOCAL_MORPHER_MIN_RATE || val > AL_VOCAL_MORPHER_MAX_RATE)
+              SETERR_RETURN(context, AL_INVALID_VALUE,, "Vocal morpher rate out of range");
+            props->Vmorpher.Rate = val;
+            break;
+
+        default:
+            alSetError(context, AL_INVALID_ENUM, "Invalid vocal morpher float property 0x%04x", param);
+    }
+}
+void Vmorpher_setParamfv(EffectProps *props, ALCcontext *context, ALenum param, const ALfloat *vals)
+{ Vmorpher_setParamf(props, context, param, vals[0]); }
+
+void Vmorpher_getParami(const EffectProps* props, ALCcontext *context, ALenum param, ALint* val)
+{
+    switch(param)
+    {
+        case AL_VOCAL_MORPHER_PHONEMEA:
+            *val = props->Vmorpher.PhonemeA;
+            break;
+
+        case AL_VOCAL_MORPHER_PHONEMEB:
+            *val = props->Vmorpher.PhonemeB;
+            break;
+
+        case AL_VOCAL_MORPHER_PHONEMEA_COARSE_TUNING:
+            *val = props->Vmorpher.PhonemeACoarseTuning;
+            break;
+
+        case AL_VOCAL_MORPHER_PHONEMEB_COARSE_TUNING:
+            *val = props->Vmorpher.PhonemeBCoarseTuning;
+            break;
+
+        case AL_VOCAL_MORPHER_WAVEFORM:
+            *val = props->Vmorpher.Waveform;
+            break;
+
+        default:
+            alSetError(context, AL_INVALID_ENUM, "Invalid vocal morpher integer property 0x%04x", param);
+    }
+}
+void Vmorpher_getParamiv(const EffectProps*, ALCcontext *context, ALenum param, ALint*)
+{ alSetError(context, AL_INVALID_ENUM, "Invalid vocal morpher integer-vector property 0x%04x", param); }
+void Vmorpher_getParamf(const EffectProps *props, ALCcontext *context, ALenum param, ALfloat *val)
+{
+    switch(param)
+    {
+        case AL_VOCAL_MORPHER_RATE:
+            *val = props->Vmorpher.Rate;
+            break;
+
+        default:
+            alSetError(context, AL_INVALID_ENUM, "Invalid vocal morpher float property 0x%04x", param);
+    }
+}
+void Vmorpher_getParamfv(const EffectProps *props, ALCcontext *context, ALenum param, ALfloat *vals)
+{ Vmorpher_getParamf(props, context, param, vals); }
+
+DEFINE_ALEFFECT_VTABLE(Vmorpher);
+
+
+struct VmorpherStateFactory final : public EffectStateFactory {
+    EffectState *create() override { return new VmorpherState{}; }
+    EffectProps getDefaultProps() const noexcept override;
+    const EffectVtable *getEffectVtable() const noexcept override { return &Vmorpher_vtable; }
+};
+
+EffectProps VmorpherStateFactory::getDefaultProps() const noexcept
+{
+    EffectProps props{};
+    props.Vmorpher.Rate = AL_VOCAL_MORPHER_DEFAULT_RATE;
+    props.Vmorpher.PhonemeA = AL_VOCAL_MORPHER_DEFAULT_PHONEMEA;
+    props.Vmorpher.PhonemeB = AL_VOCAL_MORPHER_DEFAULT_PHONEMEB;
+    props.Vmorpher.PhonemeACoarseTuning = AL_VOCAL_MORPHER_DEFAULT_PHONEMEA_COARSE_TUNING;
+    props.Vmorpher.PhonemeBCoarseTuning = AL_VOCAL_MORPHER_DEFAULT_PHONEMEB_COARSE_TUNING;
+    props.Vmorpher.Waveform = AL_VOCAL_MORPHER_DEFAULT_WAVEFORM;
+    return props;
+}
+
+} // namespace
+
+EffectStateFactory *VmorpherStateFactory_getFactory()
+{
+    static VmorpherStateFactory VmorpherFactory{};
+    return &VmorpherFactory;
+}
diff --git a/CMakeLists.txt b/CMakeLists.txt
index a2150846..3614ec29 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -697,6 +697,7 @@ SET(ALC_OBJS
     Alc/effects/modulator.cpp
     Alc/effects/null.cpp
     Alc/effects/pshifter.cpp
+    Alc/effects/vmorpher.cpp
     Alc/effects/reverb.cpp
     Alc/filters/biquad.h
     Alc/filters/biquad.cpp
diff --git a/OpenAL32/Include/alEffect.h b/OpenAL32/Include/alEffect.h
index 51d6a24f..d94317a4 100644
--- a/OpenAL32/Include/alEffect.h
+++ b/OpenAL32/Include/alEffect.h
@@ -18,6 +18,7 @@ enum {
     FSHIFTER_EFFECT,
     MODULATOR_EFFECT,
     PSHIFTER_EFFECT,
+    VMORPHER_EFFECT,
     DEDICATED_EFFECT,
 
     MAX_EFFECTS
@@ -31,7 +32,7 @@ struct EffectList {
     int type;
     ALenum val;
 };
-extern const EffectList gEffectList[14];
+extern const EffectList gEffectList[15];
 
 
 struct ALeffect {
diff --git a/OpenAL32/alEffect.cpp b/OpenAL32/alEffect.cpp
index a2a40ac5..0c4f9e72 100644
--- a/OpenAL32/alEffect.cpp
+++ b/OpenAL32/alEffect.cpp
@@ -38,7 +38,7 @@
 #include "effects/base.h"
 
 
-const EffectList gEffectList[14]{
+const EffectList gEffectList[15]{
     { "eaxreverb",  EAXREVERB_EFFECT,  AL_EFFECT_EAXREVERB },
     { "reverb",     REVERB_EFFECT,     AL_EFFECT_REVERB },
     { "autowah",    AUTOWAH_EFFECT,    AL_EFFECT_AUTOWAH },
@@ -51,6 +51,7 @@ const EffectList gEffectList[14]{
     { "fshifter",   FSHIFTER_EFFECT,   AL_EFFECT_FREQUENCY_SHIFTER },
     { "modulator",  MODULATOR_EFFECT,  AL_EFFECT_RING_MODULATOR },
     { "pshifter",   PSHIFTER_EFFECT,   AL_EFFECT_PITCH_SHIFTER },
+    { "vmorpher",   VMORPHER_EFFECT,   AL_EFFECT_VOCAL_MORPHER },
     { "dedicated",  DEDICATED_EFFECT,  AL_EFFECT_DEDICATED_LOW_FREQUENCY_EFFECT },
     { "dedicated",  DEDICATED_EFFECT,  AL_EFFECT_DEDICATED_DIALOGUE },
 };
@@ -76,6 +77,7 @@ constexpr struct FactoryItem {
     { AL_EFFECT_FREQUENCY_SHIFTER, FshifterStateFactory_getFactory },
     { AL_EFFECT_RING_MODULATOR, ModulatorStateFactory_getFactory },
     { AL_EFFECT_PITCH_SHIFTER, PshifterStateFactory_getFactory},
+    { AL_EFFECT_VOCAL_MORPHER, VmorpherStateFactory_getFactory},
     { AL_EFFECT_DEDICATED_DIALOGUE, DedicatedStateFactory_getFactory },
     { AL_EFFECT_DEDICATED_LOW_FREQUENCY_EFFECT, DedicatedStateFactory_getFactory }
 };