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/***************************************************************************
enginedelay.cpp - description
-------------------
copyright : (C) 2002 by Tue and Ken Haste Andersen
email :
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "enginedelay.h"
#include "control/controlproxy.h"
#include "control/controlpotmeter.h"
#include "engine/engine.h"
#include "util/assert.h"
#include "util/sample.h"
namespace {
constexpr double kdMaxDelayPot = 500;
const int kiMaxDelay = (kdMaxDelayPot + 8) / 1000 *
mixxx::AudioSignal::SampleRate::kValueMax * mixxx::kEngineChannelCount;
} // anonymous namespace
EngineDelay::EngineDelay(const char* group, ConfigKey delayControl, bool bPersist)
: m_iDelayPos(0),
m_iDelay(0) {
m_pDelayBuffer = SampleUtil::alloc(kiMaxDelay);
SampleUtil::clear(m_pDelayBuffer, kiMaxDelay);
m_pDelayPot = new ControlPotmeter(delayControl, 0, kdMaxDelayPot, false, true, false, bPersist);
m_pDelayPot->setDefaultValue(0);
connect(m_pDelayPot, SIGNAL(valueChanged(double)), this,
SLOT(slotDelayChanged()), Qt::DirectConnection);
m_pSampleRate = new ControlProxy(group, "samplerate", this);
m_pSampleRate->connectValueChanged(SLOT(slotDelayChanged()), Qt::DirectConnection);
}
EngineDelay::~EngineDelay() {
SampleUtil::free(m_pDelayBuffer);
delete m_pDelayPot;
}
void EngineDelay::slotDelayChanged() {
double newDelay = m_pDelayPot->get();
double sampleRate = m_pSampleRate->get();
m_iDelay = (int)(sampleRate * newDelay / 1000);
m_iDelay *= 2;
if (m_iDelay > (kiMaxDelay - 2)) {
m_iDelay = (kiMaxDelay - 2);
}
if (m_iDelay <= 0) {
// We start bypassing, so clear buffer, to avoid noise in case of re-enable delay
SampleUtil::clear(m_pDelayBuffer, kiMaxDelay);
}
}
void EngineDelay::process(CSAMPLE* pInOut, const int iBufferSize) {
if (m_iDelay > 0) {
int iDelaySourcePos = (m_iDelayPos + kiMaxDelay - m_iDelay) % kiMaxDelay;
VERIFY_OR_DEBUG_ASSERT(iDelaySourcePos >= 0) {
return;
}
VERIFY_OR_DEBUG_ASSERT(iDelaySourcePos <= kiMaxDelay) {
return;
}
for (int i = 0; i < iBufferSize; ++i) {
// put sample into delay buffer:
m_pDelayBuffer[m_iDelayPos] = pInOut[i];
m_iDelayPos = (m_iDelayPos + 1) % kiMaxDelay;
// Take delayed sample from delay buffer and copy it to dest buffer:
pInOut[i] = m_pDelayBuffer[iDelaySourcePos];
iDelaySourcePos = (iDelaySourcePos + 1) % kiMaxDelay;
}
}
}
void EngineDelay::setDelay(double newDelay) {
m_pDelayPot->set(newDelay);
}
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