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92ea95e34a
In https://webrtc-review.googlesource.com/c/src/+/1560 we moved WebRTC from src/webrtc to src/ (in order to preserve an healthy git history). This CL takes care of fixing header guards, #include paths, etc... NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true TBR=tommi@webrtc.org Bug: chromium:611808 Change-Id: Iea91618212bee0af16aa3f05071eab8f93706578 Reviewed-on: https://webrtc-review.googlesource.com/1561 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Henrik Kjellander <kjellander@webrtc.org> Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#19846}
75 lines
2.9 KiB
C++
75 lines
2.9 KiB
C++
/*
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* Copyright (c) 2014 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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#include "modules/rtp_rtcp/include/remote_ntp_time_estimator.h"
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#include "rtc_base/logging.h"
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#include "system_wrappers/include/clock.h"
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#include "system_wrappers/include/timestamp_extrapolator.h"
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namespace webrtc {
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static const int kTimingLogIntervalMs = 10000;
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// TODO(wu): Refactor this class so that it can be shared with
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// vie_sync_module.cc.
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RemoteNtpTimeEstimator::RemoteNtpTimeEstimator(Clock* clock)
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: clock_(clock),
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ts_extrapolator_(new TimestampExtrapolator(clock_->TimeInMilliseconds())),
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last_timing_log_ms_(-1) {
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}
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RemoteNtpTimeEstimator::~RemoteNtpTimeEstimator() {}
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bool RemoteNtpTimeEstimator::UpdateRtcpTimestamp(int64_t rtt,
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uint32_t ntp_secs,
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uint32_t ntp_frac,
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uint32_t rtcp_timestamp) {
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bool new_rtcp_sr = false;
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if (!rtp_to_ntp_.UpdateMeasurements(ntp_secs, ntp_frac, rtcp_timestamp,
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&new_rtcp_sr)) {
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return false;
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}
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if (!new_rtcp_sr) {
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// No new RTCP SR since last time this function was called.
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return true;
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}
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// Update extrapolator with the new arrival time.
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// The extrapolator assumes the TimeInMilliseconds time.
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int64_t receiver_arrival_time_ms = clock_->TimeInMilliseconds();
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int64_t sender_send_time_ms = Clock::NtpToMs(ntp_secs, ntp_frac);
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int64_t sender_arrival_time_90k = (sender_send_time_ms + rtt / 2) * 90;
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ts_extrapolator_->Update(receiver_arrival_time_ms, sender_arrival_time_90k);
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return true;
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}
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int64_t RemoteNtpTimeEstimator::Estimate(uint32_t rtp_timestamp) {
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int64_t sender_capture_ntp_ms = 0;
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if (!rtp_to_ntp_.Estimate(rtp_timestamp, &sender_capture_ntp_ms)) {
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return -1;
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}
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uint32_t timestamp = sender_capture_ntp_ms * 90;
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int64_t receiver_capture_ms =
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ts_extrapolator_->ExtrapolateLocalTime(timestamp);
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int64_t ntp_offset =
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clock_->CurrentNtpInMilliseconds() - clock_->TimeInMilliseconds();
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int64_t receiver_capture_ntp_ms = receiver_capture_ms + ntp_offset;
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int64_t now_ms = clock_->TimeInMilliseconds();
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if (now_ms - last_timing_log_ms_ > kTimingLogIntervalMs) {
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LOG(LS_INFO) << "RTP timestamp: " << rtp_timestamp
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<< " in NTP clock: " << sender_capture_ntp_ms
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<< " estimated time in receiver clock: " << receiver_capture_ms
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<< " converted to NTP clock: " << receiver_capture_ntp_ms;
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last_timing_log_ms_ = now_ms;
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}
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return receiver_capture_ntp_ms;
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}
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} // namespace webrtc
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