blob: af325e91b12d5d05054d4b88e2d7dd5d12968e32 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
/*
* Copyright (C) 2005-2013 Team XBMC
* http://xbmc.org
*
* 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, or (at your option)
* any later version.
*
* This Program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with XBMC; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#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();
}
BitstreamStats::~BitstreamStats()
{
}
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();
}
}
|
