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63b3095d2b
This also changes the meaning of |estimated_capture_clock_offset| in |absolute_capture_time_| to become a remote to capturer clock offset. Bug: chromium:1056230, webrtc:10739 Change-Id: Id658590e027bbe77ae0834ea224e1dc977a305f2 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/219163 Commit-Queue: Minyue Li <minyue@webrtc.org> Reviewed-by: Åsa Persson <asapersson@webrtc.org> Reviewed-by: Erik Språng <sprang@webrtc.org> Reviewed-by: Alessio Bazzica <alessiob@webrtc.org> Reviewed-by: Christoffer Rodbro <crodbro@webrtc.org> Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org> Reviewed-by: Chen Xing <chxg@google.com> Cr-Commit-Position: refs/heads/master@{#34067}
51 lines
1.9 KiB
C++
51 lines
1.9 KiB
C++
/*
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* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_RTP_RTCP_SOURCE_CAPTURE_CLOCK_OFFSET_UPDATER_H_
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#define MODULES_RTP_RTCP_SOURCE_CAPTURE_CLOCK_OFFSET_UPDATER_H_
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#include <stdint.h>
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#include "absl/types/optional.h"
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namespace webrtc {
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//
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// Helper class for calculating the clock offset against the capturer's clock.
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//
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// This is achieved by adjusting the estimated capture clock offset in received
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// Absolute Capture Time RTP header extension (see
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// https://webrtc.org/experiments/rtp-hdrext/abs-capture-time/), which
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// represents the clock offset between a remote sender and the capturer, by
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// adding local-to-remote clock offset.
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class CaptureClockOffsetUpdater {
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public:
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// Adjusts remote_capture_clock_offset, which originates from Absolute Capture
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// Time RTP header extension, to get the local clock offset against the
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// capturer's clock.
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absl::optional<int64_t> AdjustEstimatedCaptureClockOffset(
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absl::optional<int64_t> remote_capture_clock_offset) const;
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// Sets the NTP clock offset between the sender system (which may be different
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// from the capture system) and the local system. This information is normally
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// provided by passing half the value of the Round-Trip Time estimation given
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// by RTCP sender reports (see DLSR/DLRR).
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//
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// Note that the value must be in Q32.32-formatted fixed-point seconds.
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void SetRemoteToLocalClockOffset(absl::optional<int64_t> offset_q32x32);
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private:
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absl::optional<int64_t> remote_to_local_clock_offset_;
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};
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} // namespace webrtc
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#endif // MODULES_RTP_RTCP_SOURCE_CAPTURE_CLOCK_OFFSET_UPDATER_H_
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