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
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/*
* Implementation of RTCP statistics reporting.
*/
#include "rtcp.h"
#include <string.h>
#include "signal_processing_library.h"
int WebRtcNetEQ_RTCPInit(WebRtcNetEQ_RTCP_t *RTCP_inst, uint16_t uw16_seqNo)
{
/*
* Initialize everything to zero and then set the start values for the RTP packet stream.
*/
WebRtcSpl_MemSetW16((int16_t*) RTCP_inst, 0,
sizeof(WebRtcNetEQ_RTCP_t) / sizeof(int16_t));
RTCP_inst->base_seq = uw16_seqNo;
RTCP_inst->max_seq = uw16_seqNo;
return 0;
}
int WebRtcNetEQ_RTCPUpdate(WebRtcNetEQ_RTCP_t *RTCP_inst, uint16_t uw16_seqNo,
uint32_t uw32_timeStamp, uint32_t uw32_recTime)
{
int16_t w16_SeqDiff;
int32_t w32_TimeDiff;
int32_t w32_JitterDiff;
/*
* Update number of received packets, and largest packet number received.
*/
RTCP_inst->received++;
w16_SeqDiff = uw16_seqNo - RTCP_inst->max_seq;
if (w16_SeqDiff >= 0)
{
if (uw16_seqNo < RTCP_inst->max_seq)
{
/* Wrap around detected */
RTCP_inst->cycles++;
}
RTCP_inst->max_seq = uw16_seqNo;
}
/* Calculate Jitter, and update previous timestamps */
/* Note that the value in RTCP_inst->jitter is in Q4. */
if (RTCP_inst->received > 1)
{
w32_TimeDiff = (uw32_recTime - (uw32_timeStamp - RTCP_inst->transit));
w32_TimeDiff = WEBRTC_SPL_ABS_W32(w32_TimeDiff);
w32_JitterDiff = WEBRTC_SPL_LSHIFT_W16(w32_TimeDiff, 4) - RTCP_inst->jitter;
RTCP_inst->jitter = RTCP_inst->jitter + WEBRTC_SPL_RSHIFT_W32((w32_JitterDiff + 8), 4);
}
RTCP_inst->transit = (uw32_timeStamp - uw32_recTime);
return 0;
}
int WebRtcNetEQ_RTCPGetStats(WebRtcNetEQ_RTCP_t *RTCP_inst,
uint16_t *puw16_fraction_lost,
uint32_t *puw32_cum_lost, uint32_t *puw32_ext_max,
uint32_t *puw32_jitter, int16_t doNotReset)
{
uint32_t uw32_exp_nr, uw32_exp_interval, uw32_rec_interval;
int32_t w32_lost;
/* Extended highest sequence number received */
*puw32_ext_max
= (uint32_t) WEBRTC_SPL_LSHIFT_W32((uint32_t)RTCP_inst->cycles, 16)
+ RTCP_inst->max_seq;
/*
* Calculate expected number of packets and compare it to the number of packets that
* were actually received => the cumulative number of packets lost can be extracted.
*/
uw32_exp_nr = *puw32_ext_max - RTCP_inst->base_seq + 1;
if (RTCP_inst->received == 0)
{
/* no packets received, assume none lost */
*puw32_cum_lost = 0;
}
else if (uw32_exp_nr > RTCP_inst->received)
{
*puw32_cum_lost = uw32_exp_nr - RTCP_inst->received;
if (*puw32_cum_lost > (uint32_t) 0xFFFFFF)
{
*puw32_cum_lost = 0xFFFFFF;
}
}
else
{
*puw32_cum_lost = 0;
}
/* Fraction lost (Since last report) */
uw32_exp_interval = uw32_exp_nr - RTCP_inst->exp_prior;
if (!doNotReset)
{
RTCP_inst->exp_prior = uw32_exp_nr;
}
uw32_rec_interval = RTCP_inst->received - RTCP_inst->rec_prior;
if (!doNotReset)
{
RTCP_inst->rec_prior = RTCP_inst->received;
}
w32_lost = (int32_t) (uw32_exp_interval - uw32_rec_interval);
if (uw32_exp_interval == 0 || w32_lost <= 0 || RTCP_inst->received == 0)
{
*puw16_fraction_lost = 0;
}
else
{
*puw16_fraction_lost = (uint16_t) (WEBRTC_SPL_LSHIFT_W32(w32_lost, 8)
/ uw32_exp_interval);
}
if (*puw16_fraction_lost > 0xFF)
{
*puw16_fraction_lost = 0xFF;
}
/* Inter-arrival jitter */
*puw32_jitter = (RTCP_inst->jitter) >> 4; /* scaling from Q4 */
return 0;
}
|
