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pitch shift for formant filters

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This commit is contained in:
Anis 2019-07-18 21:42:59 +02:00
parent 2b21a08f89
commit 31055f48d6
1 changed files with 81 additions and 78 deletions
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159
Alc/effects/vmorpher.cpp
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@ -30,13 +30,16 @@
#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 NUM_FORMANTS 4
#define NUM_FILTERS 2
#define Q_FACTOR 5.0f
#define VOWEL_A_INDEX 0
#define VOWEL_B_INDEX 1
#define WAVEFORM_FRACBITS 24
#define WAVEFORM_FRACONE (1<<WAVEFORM_FRACBITS)
@ -82,14 +85,14 @@ struct FormantFilter
/* A state variable filter from a topology-preserving transform.
* Based on a talk given by Ivan Cohen: https://www.youtube.com/watch?v=esjHXGPyrhg
*/
const float g = std::tan(al::MathDefs<float>::Pi() * f0norm);
const float h = 1.0f / (1 + (g / Q_FACTOR) + (g * g));
const ALfloat g = std::tan(al::MathDefs<float>::Pi() * f0norm);
const ALfloat 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;
const ALfloat H = h * (samplesIn[i] - (1.0f / Q_FACTOR + g) * s1 - s2);
const ALfloat B = g * H + s1;
const ALfloat L = g * B + s2;
s1 = g * H + B;
s2 = g * B + L;
@ -105,19 +108,17 @@ struct FormantFilter
s2 = 0.0f;
}
float f0norm;
float fGain;
float s1;
float s2;
ALfloat f0norm;
ALfloat fGain;
ALfloat s1;
ALfloat s2;
};
struct VmorpherState final : public EffectState {
struct {
struct {
/* Effect parameters */
FormantFilter Formants[NUM_FORMANTS];
} Filters[2];
/* Effect parameters */
FormantFilter Formants[NUM_FILTERS][NUM_FORMANTS];
/* Effect gains for each channel */
ALfloat CurrentGains[MAX_OUTPUT_CHANNELS]{};
@ -144,9 +145,9 @@ ALboolean VmorpherState::deviceUpdate(const ALCdevice* /*device*/)
{
for(auto &e : mChans)
{
std::for_each(std::begin(e.Filters[0].Formants), std::end(e.Filters[0].Formants),
std::for_each(std::begin(e.Formants[VOWEL_A_INDEX]), std::end(e.Formants[VOWEL_A_INDEX]),
std::mem_fn(&FormantFilter::clear));
std::for_each(std::begin(e.Filters[1].Formants), std::end(e.Filters[1].Formants),
std::for_each(std::begin(e.Formants[VOWEL_B_INDEX]), std::end(e.Formants[VOWEL_B_INDEX]),
std::mem_fn(&FormantFilter::clear));
std::fill(std::begin(e.CurrentGains), std::end(e.CurrentGains), 0.0f);
}
@ -156,10 +157,9 @@ ALboolean VmorpherState::deviceUpdate(const ALCdevice* /*device*/)
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)};
const ALCdevice *device{context->Device};
const ALfloat frequency{static_cast<ALfloat>(device->Frequency)};
const ALfloat step{props->Vmorpher.Rate / static_cast<ALfloat>(device->Frequency)};
mStep = fastf2i(clampf(step*WAVEFORM_FRACONE, 0.0f, ALfloat{WAVEFORM_FRACONE-1}));
if(mStep == 0)
@ -171,8 +171,11 @@ void VmorpherState::update(const ALCcontext *context, const ALeffectslot *slot,
else /*if(props->Vmorpher.Waveform == AL_VOCAL_MORPHER_WAVEFORM_TRIANGLE)*/
mGetSamples = Oscillate<Triangle>;
auto& vowelA = mChans[0].Filters[0].Formants;
auto& vowelB = mChans[0].Filters[1].Formants;
auto& vowelA = mChans[0].Formants[VOWEL_A_INDEX];
auto& vowelB = mChans[0].Formants[VOWEL_B_INDEX];
const ALfloat pitchA{fastf2i(std::pow(2.0f, props->Vmorpher.PhonemeACoarseTuning*100.0f / 2400.0f)*FRACTIONONE) * (1.0f/FRACTIONONE)};
const ALfloat pitchB{fastf2i(std::pow(2.0f, props->Vmorpher.PhonemeBCoarseTuning*100.0f / 2400.0f)*FRACTIONONE) * (1.0f/FRACTIONONE)};
/* Using soprano formant set of values to
* better match mid-range frequency space.
@ -182,10 +185,10 @@ void VmorpherState::update(const ALCcontext *context, const ALeffectslot *slot,
switch(props->Vmorpher.PhonemeA)
{
case AL_VOCAL_MORPHER_PHONEME_A:
vowelA[0].f0norm = 800 / frequency;
vowelA[1].f0norm = 1150 / frequency;
vowelA[2].f0norm = 2900 / frequency;
vowelA[3].f0norm = 3900 / frequency;
vowelA[0].f0norm = (800 * pitchA) / frequency;
vowelA[1].f0norm = (1150 * pitchA) / frequency;
vowelA[2].f0norm = (2900 * pitchA) / frequency;
vowelA[3].f0norm = (3900 * pitchA) / frequency;
vowelA[0].fGain = 1.000000f; /* std::pow(10.0f, 0 / 20.0f); */
vowelA[1].fGain = 0.501187f; /* std::pow(10.0f, -6 / 20.0f); */
@ -193,10 +196,10 @@ void VmorpherState::update(const ALCcontext *context, const ALeffectslot *slot,
vowelA[3].fGain = 0.100000f; /* std::pow(10.0f, -20 / 20.0f); */
break;
case AL_VOCAL_MORPHER_PHONEME_E:
vowelA[0].f0norm = 350 / frequency;
vowelA[1].f0norm = 2000 / frequency;
vowelA[2].f0norm = 2800 / frequency;
vowelA[3].f0norm = 3600 / frequency;
vowelA[0].f0norm = (350 * pitchA) / frequency;
vowelA[1].f0norm = (2000 * pitchA) / frequency;
vowelA[2].f0norm = (2800 * pitchA) / frequency;
vowelA[3].f0norm = (3600 * pitchA) / frequency;
vowelA[0].fGain = 1.000000f; /* std::pow(10.0f, 0 / 20.0f); */
vowelA[1].fGain = 0.100000f; /* std::pow(10.0f, -20 / 20.0f); */
@ -204,10 +207,10 @@ void VmorpherState::update(const ALCcontext *context, const ALeffectslot *slot,
vowelA[3].fGain = 0.009999f; /* std::pow(10.0f, -40 / 20.0f); */
break;
case AL_VOCAL_MORPHER_PHONEME_I:
vowelA[0].f0norm = 270 / frequency;
vowelA[1].f0norm = 2140 / frequency;
vowelA[2].f0norm = 2950 / frequency;
vowelA[3].f0norm = 3900 / frequency;
vowelA[0].f0norm = (270 * pitchA) / frequency;
vowelA[1].f0norm = (2140 * pitchA) / frequency;
vowelA[2].f0norm = (2950 * pitchA) / frequency;
vowelA[3].f0norm = (3900 * pitchA) / frequency;
vowelA[0].fGain = 1.000000f; /* std::pow(10.0f, 0 / 20.0f); */
vowelA[1].fGain = 0.251188f; /* std::pow(10.0f, -12 / 20.0f); */
@ -215,10 +218,10 @@ void VmorpherState::update(const ALCcontext *context, const ALeffectslot *slot,
vowelA[3].fGain = 0.050118f; /* std::pow(10.0f, -26 / 20.0f); */
break;
case AL_VOCAL_MORPHER_PHONEME_O:
vowelA[0].f0norm = 450 / frequency;
vowelA[1].f0norm = 800 / frequency;
vowelA[2].f0norm = 2830 / frequency;
vowelA[3].f0norm = 3800 / frequency;
vowelA[0].f0norm = (450 * pitchA) / frequency;
vowelA[1].f0norm = (800 * pitchA) / frequency;
vowelA[2].f0norm = (2830 * pitchA) / frequency;
vowelA[3].f0norm = (3800 * pitchA) / frequency;
vowelA[0].fGain = 1.000000f; /* std::pow(10.0f, 0 / 20.0f); */
vowelA[1].fGain = 0.281838f; /* std::pow(10.0f, -11 / 20.0f); */
@ -226,10 +229,10 @@ void VmorpherState::update(const ALCcontext *context, const ALeffectslot *slot,
vowelA[3].fGain = 0.079432f; /* std::pow(10.0f, -22 / 20.0f); */
break;
case AL_VOCAL_MORPHER_PHONEME_U:
vowelA[0].f0norm = 325 / frequency;
vowelA[1].f0norm = 700 / frequency;
vowelA[2].f0norm = 2700 / frequency;
vowelA[3].f0norm = 3800 / frequency;
vowelA[0].f0norm = (325 * pitchA) / frequency;
vowelA[1].f0norm = (700 * pitchA) / frequency;
vowelA[2].f0norm = (2700 * pitchA) / frequency;
vowelA[3].f0norm = (3800 * pitchA) / frequency;
vowelA[0].fGain = 1.000000f; /* std::pow(10.0f, 0 / 20.0f); */
vowelA[1].fGain = 0.158489f; /* std::pow(10.0f, -16 / 20.0f); */
@ -241,10 +244,10 @@ void VmorpherState::update(const ALCcontext *context, const ALeffectslot *slot,
switch(props->Vmorpher.PhonemeB)
{
case AL_VOCAL_MORPHER_PHONEME_A:
vowelB[0].f0norm = 800 / frequency;
vowelB[1].f0norm = 1150 / frequency;
vowelB[2].f0norm = 2900 / frequency;
vowelB[3].f0norm = 3900 / frequency;
vowelB[0].f0norm = (800 * pitchB) / frequency;
vowelB[1].f0norm = (1150 * pitchB) / frequency;
vowelB[2].f0norm = (2900 * pitchB) / frequency;
vowelB[3].f0norm = (3900 * pitchB) / frequency;
vowelB[0].fGain = 1.000000f; /* std::pow(10.0f, 0 / 20.0f); */
vowelB[1].fGain = 0.501187f; /* std::pow(10.0f, -6 / 20.0f); */
@ -252,10 +255,10 @@ void VmorpherState::update(const ALCcontext *context, const ALeffectslot *slot,
vowelB[3].fGain = 0.100000f; /* std::pow(10.0f, -20 / 20.0f); */
break;
case AL_VOCAL_MORPHER_PHONEME_E:
vowelB[0].f0norm = 350 / frequency;
vowelB[1].f0norm = 2000 / frequency;
vowelB[2].f0norm = 2800 / frequency;
vowelB[3].f0norm = 3600 / frequency;
vowelB[0].f0norm = (350 * pitchB) / frequency;
vowelB[1].f0norm = (2000 * pitchB) / frequency;
vowelB[2].f0norm = (2800 * pitchB) / frequency;
vowelB[3].f0norm = (3600 * pitchB) / frequency;
vowelB[0].fGain = 1.000000f; /* std::pow(10.0f, 0 / 20.0f); */
vowelB[1].fGain = 0.100000f; /* std::pow(10.0f, -20 / 20.0f); */
@ -263,10 +266,10 @@ void VmorpherState::update(const ALCcontext *context, const ALeffectslot *slot,
vowelB[3].fGain = 0.009999f; /* std::pow(10.0f, -40 / 20.0f); */
break;
case AL_VOCAL_MORPHER_PHONEME_I:
vowelB[0].f0norm = 270 / frequency;
vowelB[1].f0norm = 2140 / frequency;
vowelB[2].f0norm = 2950 / frequency;
vowelB[3].f0norm = 3900 / frequency;
vowelB[0].f0norm = (270 * pitchB) / frequency;
vowelB[1].f0norm = (2140 * pitchB) / frequency;
vowelB[2].f0norm = (2950 * pitchB) / frequency;
vowelB[3].f0norm = (3900 * pitchB) / frequency;
vowelB[0].fGain = 1.000000f; /* std::pow(10.0f, 0 / 20.0f); */
vowelB[1].fGain = 0.251188f; /* std::pow(10.0f, -12 / 20.0f); */
@ -274,10 +277,10 @@ void VmorpherState::update(const ALCcontext *context, const ALeffectslot *slot,
vowelB[3].fGain = 0.050118f; /* std::pow(10.0f, -26 / 20.0f); */
break;
case AL_VOCAL_MORPHER_PHONEME_O:
vowelB[0].f0norm = 450 / frequency;
vowelB[1].f0norm = 800 / frequency;
vowelB[2].f0norm = 2830 / frequency;
vowelB[3].f0norm = 3800 / frequency;
vowelB[0].f0norm = (450 * pitchB) / frequency;
vowelB[1].f0norm = (800 * pitchB) / frequency;
vowelB[2].f0norm = (2830 * pitchB) / frequency;
vowelB[3].f0norm = (3800 * pitchB) / frequency;
vowelB[0].fGain = 1.000000f; /* std::pow(10.0f, 0 / 20.0f); */
vowelB[1].fGain = 0.281838f; /* std::pow(10.0f, -11 / 20.0f); */
@ -285,10 +288,10 @@ void VmorpherState::update(const ALCcontext *context, const ALeffectslot *slot,
vowelB[3].fGain = 0.079432f; /* std::pow(10.0f, -22 / 20.0f); */
break;
case AL_VOCAL_MORPHER_PHONEME_U:
vowelB[0].f0norm = 325 / frequency;
vowelB[1].f0norm = 700 / frequency;
vowelB[2].f0norm = 2700 / frequency;
vowelB[3].f0norm = 3800 / frequency;
vowelB[0].f0norm = (325 * pitchB) / frequency;
vowelB[1].f0norm = (700 * pitchB) / frequency;
vowelB[2].f0norm = (2700 * pitchB) / frequency;
vowelB[3].f0norm = (3800 * pitchB) / frequency;
vowelB[0].fGain = 1.000000f; /* std::pow(10.0f, 0 / 20.0f); */
vowelB[1].fGain = 0.158489f; /* std::pow(10.0f, -16 / 20.0f); */
@ -300,15 +303,15 @@ void VmorpherState::update(const ALCcontext *context, const ALeffectslot *slot,
/* Copy the filter coefficients for the other input channels. */
for(ALuint i{1u};i < slot->Wet.Buffer.size();++i)
{
mChans[i].Filters[0].Formants[0] = vowelA[0];
mChans[i].Filters[0].Formants[1] = vowelA[1];
mChans[i].Filters[0].Formants[2] = vowelA[2];
mChans[i].Filters[0].Formants[3] = vowelA[3];
mChans[i].Formants[VOWEL_A_INDEX][0] = vowelA[0];
mChans[i].Formants[VOWEL_A_INDEX][1] = vowelA[1];
mChans[i].Formants[VOWEL_A_INDEX][2] = vowelA[2];
mChans[i].Formants[VOWEL_A_INDEX][3] = vowelA[3];
mChans[i].Filters[1].Formants[0] = vowelB[0];
mChans[i].Filters[1].Formants[1] = vowelB[1];
mChans[i].Filters[1].Formants[2] = vowelB[2];
mChans[i].Filters[1].Formants[3] = vowelB[3];
mChans[i].Formants[VOWEL_B_INDEX][0] = vowelB[0];
mChans[i].Formants[VOWEL_B_INDEX][1] = vowelB[1];
mChans[i].Formants[VOWEL_B_INDEX][2] = vowelB[2];
mChans[i].Formants[VOWEL_B_INDEX][3] = vowelB[3];
}
mOutTarget = target.Main->Buffer;
@ -342,8 +345,8 @@ void VmorpherState::process(const ALsizei samplesToDo, const FloatBufferLine *RE
mSampleBufferB[i] = 0.0f;
}
auto& vowelA = mChans[c].Filters[0].Formants;
auto& vowelB = mChans[c].Filters[1].Formants;
auto& vowelA = mChans[c].Formants[VOWEL_A_INDEX];
auto& vowelB = mChans[c].Formants[VOWEL_B_INDEX];
/* Process first vowel. */
vowelA[0].process(&samplesIn[c][base], mSampleBufferA, td);
@ -486,12 +489,12 @@ struct VmorpherStateFactory final : public EffectStateFactory {
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.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;
props.Vmorpher.Waveform = AL_VOCAL_MORPHER_DEFAULT_WAVEFORM;
return props;
}