mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-13 13:50:40 +01:00
8037fc6ffa
Bug: webrtc:342905193 No-Try: True Change-Id: Icc968be43b8830038ea9a1f5f604307220457807 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/361021 Auto-Submit: Florent Castelli <orphis@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Florent Castelli <orphis@webrtc.org> Cr-Commit-Position: refs/heads/main@{#42911}
57 lines
2.1 KiB
C++
57 lines
2.1 KiB
C++
/*
|
|
* Copyright (c) 2021 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.
|
|
*/
|
|
|
|
#ifndef MODULES_RTP_RTCP_SOURCE_CAPTURE_CLOCK_OFFSET_UPDATER_H_
|
|
#define MODULES_RTP_RTCP_SOURCE_CAPTURE_CLOCK_OFFSET_UPDATER_H_
|
|
|
|
#include <stdint.h>
|
|
|
|
#include <optional>
|
|
|
|
#include "api/units/time_delta.h"
|
|
|
|
namespace webrtc {
|
|
|
|
//
|
|
// Helper class for calculating the clock offset against the capturer's clock.
|
|
//
|
|
// This is achieved by adjusting the estimated capture clock offset in received
|
|
// Absolute Capture Time RTP header extension (see
|
|
// https://webrtc.org/experiments/rtp-hdrext/abs-capture-time/), which
|
|
// represents the clock offset between a remote sender and the capturer, by
|
|
// adding local-to-remote clock offset.
|
|
|
|
class CaptureClockOffsetUpdater {
|
|
public:
|
|
// Adjusts remote_capture_clock_offset, which originates from Absolute Capture
|
|
// Time RTP header extension, to get the local clock offset against the
|
|
// capturer's clock.
|
|
std::optional<int64_t> AdjustEstimatedCaptureClockOffset(
|
|
std::optional<int64_t> remote_capture_clock_offset) const;
|
|
|
|
// Sets the NTP clock offset between the sender system (which may be different
|
|
// from the capture system) and the local system. This information is normally
|
|
// provided by passing half the value of the Round-Trip Time estimation given
|
|
// by RTCP sender reports (see DLSR/DLRR).
|
|
//
|
|
// Note that the value must be in Q32.32-formatted fixed-point seconds.
|
|
void SetRemoteToLocalClockOffset(std::optional<int64_t> offset_q32x32);
|
|
|
|
// Converts a signed Q32.32-formatted fixed-point to a TimeDelta.
|
|
static std::optional<TimeDelta> ConvertsToTimeDela(
|
|
std::optional<int64_t> q32x32);
|
|
|
|
private:
|
|
std::optional<int64_t> remote_to_local_clock_offset_;
|
|
};
|
|
|
|
} // namespace webrtc
|
|
|
|
#endif // MODULES_RTP_RTCP_SOURCE_CAPTURE_CLOCK_OFFSET_UPDATER_H_
|