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/*
* Copyright (C) 2005-2018 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 "BitstreamStats.h"
#include "utils/TimeUtils.h"
int64_t BitstreamStats::m_tmFreq;
BitstreamStats::BitstreamStats(unsigned int nEstimatedBitrate)
{
m_dBitrate = 0.0;
m_dMaxBitrate = 0.0;
m_dMinBitrate = -1.0;
m_nBitCount = 0;
m_nEstimatedBitrate = nEstimatedBitrate;
m_tmStart = 0LL;
if (m_tmFreq == 0LL)
m_tmFreq = CurrentHostFrequency();
}
void BitstreamStats::AddSampleBytes(unsigned int nBytes)
{
AddSampleBits(nBytes*8);
}
void BitstreamStats::AddSampleBits(unsigned int nBits)
{
m_nBitCount += nBits;
if (m_nBitCount >= m_nEstimatedBitrate)
CalculateBitrate();
}
void BitstreamStats::Start()
{
m_nBitCount = 0;
m_tmStart = CurrentHostCounter();
}
void BitstreamStats::CalculateBitrate()
{
int64_t tmNow;
tmNow = CurrentHostCounter();
double elapsed = (double)(tmNow - m_tmStart) / (double)m_tmFreq;
// only update once every 2 seconds
if (elapsed >= 2)
{
m_dBitrate = (double)m_nBitCount / elapsed;
if (m_dBitrate > m_dMaxBitrate)
m_dMaxBitrate = m_dBitrate;
if (m_dBitrate < m_dMinBitrate || m_dMinBitrate == -1)
m_dMinBitrate = m_dBitrate;
Start();
}
}
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