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#include "effects/builtin/flangereffect.h"
#include <QtDebug>
#include "util/math.h"
namespace{
// Gain correction was verified with replay gain and default parameters
const double kGainCorrection = 1.4125375446227544; // 3 dB
inline CSAMPLE tanh_approx(CSAMPLE input) {
// return tanhf(input); // 142ns for process;
return input / (1 + input * input / (3 + input * input / 5)); // 119ns for process
}
}
// static
QString FlangerEffect::getId() {
return "org.mixxx.effects.flanger";
}
// static
EffectManifestPointer FlangerEffect::getManifest() {
EffectManifestPointer pManifest(new EffectManifest());
pManifest->setId(getId());
pManifest->setName(QObject::tr("Flanger"));
pManifest->setShortName(QObject::tr("Flanger"));
pManifest->setAuthor("The Mixxx Team");
pManifest->setVersion("1.0");
pManifest->setDescription(QObject::tr(
"Mixes the input with a delayed, pitch modulated copy of itself to create comb filtering"));
pManifest->setMetaknobDefault(1.0);
EffectManifestParameterPointer speed = pManifest->addParameter();
speed->setId("speed");
speed->setName(QObject::tr("Speed"));
speed->setShortName(QObject::tr("Speed"));
speed->setDescription(QObject::tr(
"Speed of the LFO (low frequency oscillator)\n"
"32 - 1/4 beats rounded to 1/2 beat per LFO cycle if tempo is detected\n"
"1/32 - 4 Hz if no tempo is detected"));
speed->setControlHint(EffectManifestParameter::ControlHint::KNOB_LOGARITHMIC_INVERSE);
speed->setSemanticHint(EffectManifestParameter::SemanticHint::UNKNOWN);
speed->setMinimum(kMinLfoBeats);
speed->setMaximum(kMaxLfoBeats);
speed->setDefault(8);
EffectManifestParameterPointer width = pManifest->addParameter();
width->setId("width");
width->setName(QObject::tr("Width"));
width->setShortName(QObject::tr("Width"));
width->setDescription(QObject::tr(
"Delay amplitude of the LFO (low frequency oscillator)"));
width->setControlHint(EffectManifestParameter::ControlHint::KNOB_LOGARITHMIC);
width->setSemanticHint(EffectManifestParameter::SemanticHint::UNKNOWN);
width->setUnitsHint(EffectManifestParameter::UnitsHint::UNKNOWN);
width->setDefault(kMaxLfoWidthMs / 2);
width->setMinimum(0.0);
width->setMaximum(kMaxLfoWidthMs);
EffectManifestParameterPointer manual = pManifest->addParameter();
manual->setId("manual");
manual->setName(QObject::tr("Manual"));
manual->setShortName(QObject::tr("Manual"));
manual->setDescription(QObject::tr(
"Delay offset of the LFO (low frequency oscillator).\n"
"With width at zero, this allows for manually sweeping over the entire delay range."));
manual->setControlHint(EffectManifestParameter::ControlHint::KNOB_LOGARITHMIC);
manual->setSemanticHint(EffectManifestParameter::SemanticHint::UNKNOWN);
manual->setUnitsHint(EffectManifestParameter::UnitsHint::UNKNOWN);
manual->setDefault(kCenterDelayMs);
manual->setMinimum(kMinDelayMs);
manual->setMaximum(kMaxDelayMs);
EffectManifestParameterPointer regen = pManifest->addParameter();
regen->setId("regen");
regen->setName(QObject::tr("Regeneration"));
regen->setShortName(QObject::tr("Regen"));
regen->setDescription(QObject::tr(
"How much of the delay output is feed back into the input"));
regen->setControlHint(EffectManifestParameter::ControlHint::KNOB_LINEAR);
regen->setSemanticHint(EffectManifestParameter::SemanticHint::UNKNOWN);
regen->setUnitsHint(EffectManifestParameter::UnitsHint::UNKNOWN);
regen->setDefault(0.25);
regen->setMinimum(0.0);
regen->setMaximum(1.0);
EffectManifestParameterPointer mix = pManifest->addParameter();
mix->setId("mix");
mix->setName(QObject::tr("Mix"));
mix->setShortName(QObject::tr("Mix"));
mix->setDescription(QObject::tr(
"Intensity of the effect"));
mix->setControlHint(EffectManifestParameter::ControlHint::KNOB_LINEAR);
mix->setSemanticHint(EffectManifestParameter::SemanticHint::UNKNOWN);
mix->setUnitsHint(EffectManifestParameter::UnitsHint::UNKNOWN);
mix->setDefaultLinkType(EffectManifestParameter::LinkType::LINKED);
mix->setDefault(1.0);
mix->setMinimum(0.0);
mix->setMaximum(1.0);
EffectManifestParameterPointer triplet = pManifest->addParameter();
triplet->setId("triplet");
triplet->setName(QObject::tr("Triplets"));
triplet->setShortName(QObject::tr("Triplets"));
triplet->setDescription(QObject::tr(
"Divide rounded 1/2 beats of the Period parameter by 3."));
triplet->setControlHint(EffectManifestParameter::ControlHint::TOGGLE_STEPPING);
triplet->setSemanticHint(EffectManifestParameter::SemanticHint::UNKNOWN);
triplet->setUnitsHint(EffectManifestParameter::UnitsHint::UNKNOWN);
triplet->setDefault(0);
triplet->setMinimum(0);
triplet->setMaximum(1);
return pManifest;
}
FlangerEffect::FlangerEffect(EngineEffect* pEffect)
: m_pSpeedParameter(pEffect->getParameterById("speed")),
m_pWidthParameter(pEffect->getParameterById("width")),
m_pManualParameter(pEffect->getParameterById("manual")),
m_pRegenParameter(pEffect->getParameterById("regen")),
m_pMixParameter(pEffect->getParameterById("mix")),
m_pTripletParameter(pEffect->getParameterById("triplet")) {
}
FlangerEffect::~FlangerEffect() {
//qDebug() << debugString() << "destroyed";
}
void FlangerEffect::processChannel(const ChannelHandle& handle,
FlangerGroupState* pState,
const CSAMPLE* pInput, CSAMPLE* pOutput,
const mixxx::EngineParameters& bufferParameters,
const EffectEnableState enableState,
const GroupFeatureState& groupFeatures) {
Q_UNUSED(handle);
double lfoPeriodParameter = m_pSpeedParameter->value();
double lfoPeriodFrames;
if (groupFeatures.has_beat_length_sec) {
// lfoPeriodParameter is a number of beats
lfoPeriodParameter = std::max(roundToFraction(lfoPeriodParameter, 2.0), kMinLfoBeats);
if (m_pTripletParameter->toBool()) {
lfoPeriodParameter /= 3.0;
}
lfoPeriodFrames = lfoPeriodParameter * groupFeatures.beat_length_sec
* bufferParameters.sampleRate();
} else {
// lfoPeriodParameter is a number of seconds
lfoPeriodFrames = std::max(lfoPeriodParameter, kMinLfoBeats)
* bufferParameters.sampleRate();
}
// When the period is changed, the position of the sound shouldn't
// so time need to be recalculated
if (pState->previousPeriodFrames != -1.0) {
pState->lfoFrames *= lfoPeriodFrames / pState->previousPeriodFrames;
}
pState->previousPeriodFrames = lfoPeriodFrames;
// lfoPeriodSamples is used to calculate the delay for each channel
// independently in the loop below, so do not multiply lfoPeriodSamples by
// the number of channels.
CSAMPLE_GAIN mix = m_pMixParameter->value();
RampingValue<CSAMPLE_GAIN> mixRamped(
pState->prev_mix, mix, bufferParameters.framesPerBuffer());
pState->prev_mix = mix;
CSAMPLE_GAIN regen = m_pRegenParameter->value();
RampingValue<CSAMPLE_GAIN> regenRamped(
pState->prev_regen, regen, bufferParameters.framesPerBuffer());
pState->prev_regen = regen;
// With and Manual is limited by amount of amplitude that remains from width
// to kMaxDelayMs
double width = m_pWidthParameter->value();
double manual = m_pManualParameter->value();
double maxManual = kCenterDelayMs + (kMaxLfoWidthMs - width) / 2;
double minManual = kCenterDelayMs - (kMaxLfoWidthMs - width) / 2;
manual = math_clamp(manual, minManual, maxManual);
RampingValue<double> widthRamped(
pState->prev_width, width, bufferParameters.framesPerBuffer());
pState->prev_width = width;
RampingValue<double> manualRamped(
pState->prev_manual, manual, bufferParameters.framesPerBuffer());
pState->prev_manual = manual;
CSAMPLE* delayLeft = pState->delayLeft;
CSAMPLE* delayRight = pState->delayRight;
for (unsigned int i = 0;
i < bufferParameters.samplesPerBuffer();
i += bufferParameters.channelCount()) {
CSAMPLE_GAIN mix_ramped = mixRamped.getNext();
CSAMPLE_GAIN regen_ramped = regenRamped.getNext();
double width_ramped = widthRamped.getNext();
double manual_ramped = manualRamped.getNext();
pState->lfoFrames++;
if (pState->lfoFrames >= lfoPeriodFrames) {
pState->lfoFrames = 0;
}
float periodFraction = static_cast<float>(pState->lfoFrames) / lfoPeriodFrames;
double delayMs = manual_ramped + width_ramped / 2 * sin(M_PI * 2.0f * periodFraction);
double delayFrames = delayMs * bufferParameters.sampleRate() / 1000;
SINT framePrev = (pState->delayPos - static_cast<SINT>(floor(delayFrames))
+ kBufferLenth) % kBufferLenth;
SINT frameNext = (pState->delayPos - static_cast<SINT>(ceil(delayFrames))
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