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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*!********************************************************************
Audacity: A Digital Audio Editor
DownwardMeterValueProvider.cpp
Matthieu Hodgkinson
**********************************************************************/
#include "DownwardMeterValueProvider.h"
#include <algorithm>
#include <cassert>
namespace
{
constexpr auto decayPerSecondDb = 10.f;
constexpr auto decayPerTickDb =
decayPerSecondDb * compressorMeterUpdatePeriodMs / 1000.f;
constexpr auto maxDelayMs = 5000;
constexpr auto maxTickCount = maxDelayMs / compressorMeterUpdatePeriodMs;
} // namespace
DownwardMeterValueProvider::DownwardMeterValueProvider(float upperValue)
: mUpperValue { upperValue }
, mGlobalMin { upperValue }
, mCurrentMin { upperValue }
, mFiveSecMinState { upperValue }
{
mRingBuffer.fill(upperValue);
}
void DownwardMeterValueProvider::Update(float newValue, bool alsoFiveSecondMax)
{
++mTimerCount;
const auto value = mRingBuffer[mRingBufferIndex];
mRingBuffer[mRingBufferIndex] = newValue;
mRingBufferIndex = (mRingBufferIndex + 1) % ringBufferLength;
if (value < mCurrentMin)
{
mCurrentMin = value;
mGlobalMin = std::min(mGlobalMin, value);
}
else
mCurrentMin = std::min(mCurrentMin + decayPerTickDb, mUpperValue);
mLastFiveSeconds.emplace_back(mTimerCount, value);
while (!mLastFiveSeconds.empty() &&
mLastFiveSeconds.front().first < mTimerCount - maxTickCount)
mLastFiveSeconds.erase(mLastFiveSeconds.begin());
if (!mLastFiveSeconds.empty() && alsoFiveSecondMax)
{
const auto rawMin =
std::min_element(
mLastFiveSeconds.begin(), mLastFiveSeconds.end(),
[](const auto& a, const auto& b) { return a.second < b.second; })
->second;
if (rawMin <= mFiveSecMinState)
mFiveSecMinState = rawMin;
else
mFiveSecMinState =
std::min(mFiveSecMinState + decayPerTickDb, mUpperValue);
}
}
float DownwardMeterValueProvider::GetGlobalMax() const
{
return mGlobalMin;
}
float DownwardMeterValueProvider::GetFiveSecMax() const
{
return mFiveSecMinState;
}
float DownwardMeterValueProvider::GetCurrentMax() const
{
return mCurrentMin;
}
DownwardMeterValueProvider::Direction
DownwardMeterValueProvider::GetDirection() const
{
return Direction::Downwards;
}
bool DownwardMeterValueProvider::IsInvisible() const
{
return mCurrentMin >= mUpperValue;
}
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