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
|
// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_PEERCONNECTION_PEER_CONNECTION_UTIL_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_PEERCONNECTION_PEER_CONNECTION_UTIL_H_
#include <stdint.h>
#include "base/time/time.h"
#include "third_party/blink/renderer/core/dom/dom_high_res_time_stamp.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/modules/modules_export.h"
namespace blink {
// This structure represents a capture time as a timestamp together with the
// type of clock from where there timestamp comes.
// Different sources of frames use different clocks (e.g., monotonic pausable
// vs. adjustable wall clock), with different epochs (e.g., Unix, NTP,
// system startup).
struct CaptureTimeInfo {
enum class ClockType {
// The timestamp uses a monotonic base::TimeTicks clock and is relative to
// the same platform-dependent epoch as base::TimeTicks::Now().
kTimeTicks,
// The timestamp uses a real-world clock and is relative to the NTP epoch
// (1900-01-01). Commonly used by incoming frames using the the
// abs-capture-time RTP Header extension.
kNtpRealClock
};
base::TimeDelta capture_time;
ClockType clock_type;
};
// Returns a DOMHighResTimeStamp relative to Performance.timeOrigin.
MODULES_EXPORT DOMHighResTimeStamp
RTCEncodedFrameTimestampFromTimeTicks(ExecutionContext*, base::TimeTicks);
// Returns a DOMHighResTimeStamp relative to Performance.timeOrigin.
MODULES_EXPORT DOMHighResTimeStamp
RTCEncodedFrameTimestampFromCaptureTimeInfo(ExecutionContext*, CaptureTimeInfo);
// Converts a DOMHighResTimeStamp relative to Performance.timeOrigin to a
// base::TimeDelta representing the time elapsed since the epoch associated
// with the given clock type.
MODULES_EXPORT base::TimeDelta RTCEncodedFrameTimestampToCaptureTime(
ExecutionContext*,
DOMHighResTimeStamp,
CaptureTimeInfo::ClockType);
// Returns a DOMHighResTimeStamp equivalent to the given delta.
MODULES_EXPORT DOMHighResTimeStamp
CalculateRTCEncodedFrameTimeDelta(ExecutionContext*, base::TimeDelta);
// These functions convert between an audio level in -dBov and a linear double
// value in the [0.0-1.0] range. The dBov audio level is in the [0,127] range
// as defined in RFC 6464.
MODULES_EXPORT double ToLinearAudioLevel(uint8_t audio_level_dbov);
MODULES_EXPORT uint8_t FromLinearAudioLevel(double linear_audio_level);
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_PEERCONNECTION_PEER_CONNECTION_UTIL_H_
|
