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/*
* Copyright (C) 2010-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#include "AELimiter.h"
#include "ServiceBroker.h"
#include "settings/AdvancedSettings.h"
#include "settings/SettingsComponent.h"
#include "utils/MathUtils.h"
#include <algorithm>
#include <math.h>
CAELimiter::CAELimiter()
{
m_amplify = 1.0f;
m_attenuation = 1.0f;
m_samplerate = 48000.0f;
m_holdcounter = 0;
m_increase = 0.0f;
}
float CAELimiter::Run(float* frame[AE_CH_MAX], int channels, int offset /*= 0*/, bool planar /*= false*/)
{
float highest = 0.0f;
if (!planar)
{
for(int i=0; i<channels; i++)
{
highest = std::max(highest, fabsf(*(frame[0]+offset+i)));
}
}
else
{
for(int i=0; i<channels; i++)
{
highest = std::max(highest, fabsf(*(frame[i]+offset)));
}
}
float sample = highest * m_amplify;
if (sample * m_attenuation > 1.0f)
{
m_attenuation = 1.0f / sample;
m_holdcounter = MathUtils::round_int(static_cast<double>(
m_samplerate *
CServiceBroker::GetSettingsComponent()->GetAdvancedSettings()->m_limiterHold));
m_increase = powf(std::min(sample, 10000.0f), 1.0f / (CServiceBroker::GetSettingsComponent()->GetAdvancedSettings()->m_limiterRelease * m_samplerate));
}
float attenuation = m_attenuation;
if (m_holdcounter > 0)
{
m_holdcounter--;
}
else
{
if (m_increase > 0.0f)
{
m_attenuation *= m_increase;
if (m_attenuation > 1.0f)
{
m_increase = 0.0f;
m_attenuation = 1.0f;
}
}
}
return attenuation * m_amplify;
}
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