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#include "balanceeffect.h"
#include "util/defs.h"
namespace {
const double kMaxCornerHz = 500;
const double kMinCornerHz = 16;
} // anonymous namespace
// static
QString BalanceEffect::getId() {
return "org.mixxx.effects.balance";
}
// static
EffectManifestPointer BalanceEffect::getManifest() {
EffectManifestPointer pManifest(new EffectManifest());
pManifest->setId(getId());
pManifest->setName(QObject::tr("Stereo Balance"));
pManifest->setShortName(QObject::tr("Balance"));
pManifest->setAuthor("The Mixxx Team");
pManifest->setVersion("1.0");
pManifest->setDescription(QObject::tr(
"Adjust the left/right balance and stereo width"));
pManifest->setEffectRampsFromDry(true);
EffectManifestParameterPointer balance = pManifest->addParameter();
balance->setId("balance");
balance->setName(QObject::tr("Balance"));
balance->setShortName(QObject::tr("Balance"));
balance->setDescription(QObject::tr(
"Adjust balance between left and right channels"));
balance->setControlHint(EffectManifestParameter::ControlHint::KNOB_LINEAR);
balance->setSemanticHint(EffectManifestParameter::SemanticHint::UNKNOWN);
balance->setUnitsHint(EffectManifestParameter::UnitsHint::UNKNOWN);
balance->setDefaultLinkType(EffectManifestParameter::LinkType::LINKED);
balance->setMinimum(-1.0);
balance->setMaximum(+1.0);
balance->setDefault(0.0);
EffectManifestParameterPointer midSide = pManifest->addParameter();
midSide->setId("midSide");
midSide->setName(QObject::tr("Mid/Side"));
midSide->setShortName(QObject::tr("Mid/Side"));
midSide->setDescription(QObject::tr(
"Adjust stereo width by changing balance between middle and side of the signal.\n"
"Fully left: mono\n"
"Fully right: only side ambiance\n"
"Center: does not change the original signal."));
midSide->setControlHint(EffectManifestParameter::ControlHint::KNOB_LINEAR);
midSide->setSemanticHint(EffectManifestParameter::SemanticHint::UNKNOWN);
midSide->setUnitsHint(EffectManifestParameter::UnitsHint::UNKNOWN);
midSide->setDefaultLinkType(EffectManifestParameter::LinkType::NONE);
midSide->setMinimum(-1.0);
midSide->setMaximum(+1.0);
midSide->setDefault(0.0);
EffectManifestParameterPointer midLowPass = pManifest->addParameter();
midLowPass->setId("bypassFreq");
midLowPass->setName(QObject::tr("Bypass Frequency"));
midLowPass->setShortName(QObject::tr("Bypass Fr."));
midLowPass->setDescription(QObject::tr(
"Frequencies below this cutoff are not adjusted in the stereo field"));
midLowPass->setControlHint(EffectManifestParameter::ControlHint::KNOB_LOGARITHMIC);
midLowPass->setSemanticHint(EffectManifestParameter::SemanticHint::UNKNOWN);
midLowPass->setUnitsHint(EffectManifestParameter::UnitsHint::UNKNOWN);
midLowPass->setDefaultLinkType(EffectManifestParameter::LinkType::NONE);
midLowPass->setNeutralPointOnScale(1);
midLowPass->setDefault(kMinCornerHz);
midLowPass->setMinimum(kMinCornerHz);
midLowPass->setMaximum(kMaxCornerHz);
return pManifest;
}
BalanceGroupState::BalanceGroupState(const mixxx::EngineParameters& bufferParameters)
: EffectState(bufferParameters),
m_pHighBuf(MAX_BUFFER_LEN),
m_oldSampleRate(bufferParameters.sampleRate()),
m_freq(kMinCornerHz),
m_oldBalance(0),
m_oldMidSide(0) {
m_low = std::make_unique<EngineFilterLinkwitzRiley4Low>(bufferParameters.sampleRate(),
kMinCornerHz);
m_high = std::make_unique<EngineFilterLinkwitzRiley4High>(bufferParameters.sampleRate(),
kMinCornerHz);
m_high->setStartFromDry(true);
}
BalanceGroupState::~BalanceGroupState() {
}
void BalanceGroupState::setFilters(int sampleRate, int freq) {
m_low->setFrequencyCorners(sampleRate, freq);
m_high->setFrequencyCorners(sampleRate, freq);
}
BalanceEffect::BalanceEffect(EngineEffect* pEffect)
: m_pBalanceParameter(pEffect->getParameterById("balance")),
m_pMidSideParameter(pEffect->getParameterById("midSide")),
m_pBypassFreqParameter(pEffect->getParameterById("bypassFreq")) {
}
BalanceEffect::~BalanceEffect() {
}
void BalanceEffect::processChannel(const ChannelHandle& handle,
BalanceGroupState* pGroupState,
const CSAMPLE* pInput, CSAMPLE* pOutput,
const mixxx::EngineParameters& bufferParameters,
const EffectEnableState enableState,
const GroupFeatureState& groupFeatures) {
Q_UNUSED(handle);
Q_UNUSED(groupFeatures);
CSAMPLE_GAIN balance = 0;
CSAMPLE_GAIN midSide = 0;
if (enableState != EffectEnableState::Disabling) {
balance = static_cast<decltype(balance)>(m_pBalanceParameter->value());
midSide = static_cast<decltype(midSide)>(m_pMidSideParameter->value());
}
CSAMPLE_GAIN balanceDelta = (balance - pGroupState->m_oldBalance)
/ CSAMPLE_GAIN(bufferParameters.framesPerBuffer());
CSAMPLE_GAIN midSideDelta = (midSide - pGroupState->m_oldMidSide)
/ CSAMPLE_GAIN(bufferParameters.framesPerBuffer());
CSAMPLE_GAIN balanceStart = pGroupState->m_oldBalance + balanceDelta;
CSAMPLE_GAIN midSideStart = pGroupState->m_oldMidSide + midSideDelta;
int freq = pGroupState->m_freq;
if (pGroupState->m_oldSampleRate != bufferParameters.sampleRate() ||
(freq != static_cast<int>(m_pBypassFreqParameter->value()))) {
freq = static_cast<int>(m_pBypassFreqParameter->value());
pGroupState->m_oldSampleRate = bufferParameters.sampleRate();
pGroupState->setFilters(bufferParameters.sampleRate(), pGroupState->m_freq);
}
if (pGroupState->m_freq > kMinCornerHz) {
if (freq > kMinCornerHz && enableState != EffectEnableState::Disabling) {
pGroupState->m_high->process(pInput, pGroupState->m_pHighBuf.data(), bufferParameters.samplesPerBuffer());
pGroupState->m_low->process(pInput, pOutput, bufferParameters.samplesPerBuffer());
} else {
pGroupState->m_high->processAndPauseFilter(pInput, pGroupState->m_pHighBuf.data(), bufferParameters.samplesPerBuffer());
pGroupState->m_low->processAndPauseFilter(pInput, pOutput, bufferParameters.samplesPerBuffer());
}
for (SINT i = 0; i < bufferParameters.samplesPerBuffer() / 2; ++i) {
CSAMPLE mid = (pGroupState->m_pHighBuf[i * 2] + pGroupState->m_pHighBuf[i * 2 + 1]) / 2.0f;
CSAMPLE side = (pGroupState->m_pHighBuf[i * 2 + 1] - pGroupState->m_pHighBuf[i * 2]) / 2.0f;
CSAMPLE_GAIN currentMidSide = midSideStart + midSideDelta * i;
if (currentMidSide > 0) {
mid *= (1 - currentMidSide);
} else {
side *= (1 + currentMidSide);
}
CSAMPLE_GAIN currentBalance = (balanceStart + balanceDelta * i);
if (currentBalance > 0) {
pOutput[i * 2] += (mid - side) * (1 - currentBalance);
pOutput[i * 2 + 1] += (mid + side);
} else {
pOutput[i * 2] += (mid - side);
pOutput[i * 2 + 1] += (mid + side) * (1 + currentBalance);
}
}
} else {
pGroupState->m_high->pauseFilter();
pGroupState->m_low->pauseFilter();
for (SINT i = 0; i < bufferParameters.samplesPerBuffer() / 2; ++i) {
CSAMPLE mid = (pInput[i * 2] + pInput[i * 2 + 1]) / 2.0f;
CSAMPLE side = (pInput[i * 2 + 1] - pInput[i * 2]) / 2.0f;
CSAMPLE_GAIN currentMidSide = midSideStart + midSideDelta * i;
if (currentMidSide > 0) {
mid *= (1 - currentMidSide);
} else {
side *= (1 + currentMidSide);
}
CSAMPLE_GAIN currentBalance = (balanceStart + balanceDelta * i);
if (currentBalance > 0) {
pOutput[i * 2] = (mid - side) * (1 - currentBalance);
pOutput[i * 2 + 1] = (mid + side);
} else {
pOutput[i * 2] = (mid - side);
pOutput[i * 2 + 1] = (mid + side) *
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