1 // Copyright 2015 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "media/cast/common/rtp_time.h"
6
7 #include <limits>
8 #include <sstream>
9
10 namespace media {
11 namespace cast {
12
13 namespace {
14
15 // Returns the base::TimeDelta nearest to the time represented by a tick count
16 // in the given timebase.
TicksToTimeDelta(int64_t ticks,int timebase)17 base::TimeDelta TicksToTimeDelta(int64_t ticks, int timebase) {
18 DCHECK_GT(timebase, 0);
19 const double micros = static_cast<double>(ticks) / timebase *
20 base::Time::kMicrosecondsPerSecond +
21 0.5 /* rounding */;
22 DCHECK_LT(micros, static_cast<double>(std::numeric_limits<int64_t>::max()));
23 return base::TimeDelta::FromMicroseconds(static_cast<int64_t>(micros));
24 }
25
26 // Returns the tick count in the given timebase nearest to the base::TimeDelta.
TimeDeltaToTicks(base::TimeDelta delta,int timebase)27 int64_t TimeDeltaToTicks(base::TimeDelta delta, int timebase) {
28 DCHECK_GT(timebase, 0);
29 const double ticks = delta.InSecondsF() * timebase + 0.5 /* rounding */;
30 DCHECK_LT(ticks, static_cast<double>(std::numeric_limits<int64_t>::max()));
31 return static_cast<int64_t>(ticks);
32 }
33
34 } // namespace
35
operator <<(std::ostream & out,const RtpTimeDelta rhs)36 std::ostream& operator<<(std::ostream& out, const RtpTimeDelta rhs) {
37 if (rhs.value_ >= 0)
38 out << "RTP+";
39 else
40 out << "RTP";
41 return out << rhs.value_;
42 }
43
operator <<(std::ostream & out,const RtpTimeTicks rhs)44 std::ostream& operator<<(std::ostream& out, const RtpTimeTicks rhs) {
45 return out << "RTP@" << rhs.value_;
46 }
47
ToTimeDelta(int rtp_timebase) const48 base::TimeDelta RtpTimeDelta::ToTimeDelta(int rtp_timebase) const {
49 return TicksToTimeDelta(value_, rtp_timebase);
50 }
51
52 // static
FromTimeDelta(base::TimeDelta delta,int rtp_timebase)53 RtpTimeDelta RtpTimeDelta::FromTimeDelta(base::TimeDelta delta,
54 int rtp_timebase) {
55 return RtpTimeDelta(TimeDeltaToTicks(delta, rtp_timebase));
56 }
57
58 // static
FromTicks(int64_t ticks)59 RtpTimeDelta RtpTimeDelta::FromTicks(int64_t ticks) {
60 return RtpTimeDelta(ticks);
61 }
62
ToTimeDelta(int rtp_timebase) const63 base::TimeDelta RtpTimeTicks::ToTimeDelta(int rtp_timebase) const {
64 return TicksToTimeDelta(value_, rtp_timebase);
65 }
66
67 // static
FromTimeDelta(base::TimeDelta delta,int rtp_timebase)68 RtpTimeTicks RtpTimeTicks::FromTimeDelta(base::TimeDelta delta,
69 int rtp_timebase) {
70 return RtpTimeTicks(TimeDeltaToTicks(delta, rtp_timebase));
71 }
72
73 } // namespace cast
74 } // namespace media
75