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Use environment monotonic timestamps (i.e. not UTC) in RTCStats.

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Add media config for using environment monotonic timestamps (i.e. not UTC) in RTCStats constructor, and implemented the usage of the flag.

Bug: chromium:369369568
Change-Id: Ia93d048742c28af201164fe7b2152b791bb6d0b6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/363946
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Commit-Queue: Olov Brändström <brandstrom@google.com>
Cr-Commit-Position: refs/heads/main@{#43156}
This commit is contained in:
Olov Brändström 2024-10-02 16:42:05 +02:00 committed by WebRTC LUCI CQ
parent 208491c8b9
commit 4baeed3b97
12 changed files with 110 additions and 33 deletions
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7
api/peer_connection_interface.h
View File

@ -351,6 +351,13 @@ class RTC_EXPORT PeerConnectionInterface : public webrtc::RefCountInterface {
bool dscp() const { return media_config.enable_dscp; }
void set_dscp(bool enable) { media_config.enable_dscp = enable; }
bool stats_timestamp_with_environment_clock() const {
return media_config.stats_timestamp_with_environment_clock;
}
void set_stats_timestamp_with_environment_clock(bool enable) {
media_config.stats_timestamp_with_environment_clock = enable;
}
bool cpu_adaptation() const {
return media_config.video.enable_cpu_adaptation;
}

11
media/base/media_config.h
View File

@ -22,6 +22,17 @@ struct MediaConfig {
// and delete this flag.
bool enable_dscp = true;
// If true, RTCStats timestamps are sourced from the monotonically increasing
// environment Clock, where the epoch is unspecified (i.e. up to the Clock
// implementation). If false, RTCStats timestamps are either sourced from
// system clock via rtc::TimeUTCMicros() which is relative to 1970 but not
// necessarily monotonically increasing, or from a monotonic clock that is
// set to rtc::TimeUTCMicros() at first call, and then procceeds to increase
// monotonically.
// TODO(webrtc:370535296): Change default value to true and delete this flag
// once downstream projects have migrated.
bool stats_timestamp_with_environment_clock = false;
// Video-specific config.
struct Video {
// Enable WebRTC CPU Overuse Detection. This flag comes from the

6
media/engine/webrtc_video_engine_unittest.cc
View File

@ -6035,7 +6035,8 @@ TEST_F(WebRtcVideoChannelTest, GetAggregatedStatsReportForSubStreams) {
report_block.SetCumulativeLost(17);
report_block.SetFractionLost(18);
webrtc::ReportBlockData report_block_data;
report_block_data.SetReportBlock(0, report_block, webrtc::Timestamp::Zero());
report_block_data.SetReportBlock(0, report_block, webrtc::Timestamp::Zero(),
webrtc::Timestamp::Zero());
report_block_data.AddRoundTripTimeSample(webrtc::TimeDelta::Millis(19));
substream.report_block_data = report_block_data;
substream.encode_frame_rate = 20.0;
@ -6159,7 +6160,8 @@ TEST_F(WebRtcVideoChannelTest, GetPerLayerStatsReportForSubStreams) {
report_block.SetCumulativeLost(17);
report_block.SetFractionLost(18);
webrtc::ReportBlockData report_block_data;
report_block_data.SetReportBlock(0, report_block, webrtc::Timestamp::Zero());
report_block_data.SetReportBlock(0, report_block, webrtc::Timestamp::Zero(),
webrtc::Timestamp::Zero());
report_block_data.AddRoundTripTimeSample(webrtc::TimeDelta::Millis(19));
substream.report_block_data = report_block_data;
substream.encode_frame_rate = 20.0;

6
modules/rtp_rtcp/include/report_block_data.cc
View File

@ -21,9 +21,12 @@ TimeDelta ReportBlockData::jitter(int rtp_clock_rate_hz) const {
return TimeDelta::Seconds(jitter()) / rtp_clock_rate_hz;
}
// TODO(webrtc:370535296): When (webrtc:370535296) is fixed, we don't need the
// utc timestamp.
void ReportBlockData::SetReportBlock(uint32_t sender_ssrc,
const rtcp::ReportBlock& report_block,
Timestamp report_block_timestamp_utc) {
Timestamp report_block_timestamp_utc,
Timestamp report_block_timestamp) {
sender_ssrc_ = sender_ssrc;
source_ssrc_ = report_block.source_ssrc();
fraction_lost_raw_ = report_block.fraction_lost();
@ -31,6 +34,7 @@ void ReportBlockData::SetReportBlock(uint32_t sender_ssrc,
extended_highest_sequence_number_ = report_block.extended_high_seq_num();
jitter_ = report_block.jitter();
report_block_timestamp_utc_ = report_block_timestamp_utc;
report_block_timestamp_ = report_block_timestamp;
}
void ReportBlockData::AddRoundTripTimeSample(TimeDelta rtt) {

16
modules/rtp_rtcp/include/report_block_data.h
View File

@ -72,10 +72,15 @@ class ReportBlockData {
TimeDelta jitter(int rtp_clock_rate_hz) const;
// Time in utc epoch (Jan 1st, 1970) the report block was received.
// TODO(webrtc:370535296): When (webrtc:370535296) is fixed, we don't need the
// utc timestamp.
Timestamp report_block_timestamp_utc() const {
return report_block_timestamp_utc_;
}
// Monotonic time when the report block was received.
Timestamp report_block_timestamp() const { return report_block_timestamp_; }
// Round Trip Time measurments for given (sender_ssrc, source_ssrc) pair.
// Min, max, sum, number of measurements are since beginning of the call.
TimeDelta last_rtt() const { return last_rtt_; }
@ -91,13 +96,19 @@ class ReportBlockData {
extended_highest_sequence_number_ = sn;
}
void set_jitter(uint32_t jitter) { jitter_ = jitter; }
// TODO(webrtc:370535296): When (webrtc:370535296) is fixed, we don't need the
// utc timestamp.
void set_report_block_timestamp_utc(Timestamp arrival_time) {
report_block_timestamp_utc_ = arrival_time;
}
void set_report_block_timestamp(Timestamp arrival_time) {
report_block_timestamp_ = arrival_time;
}
void SetReportBlock(uint32_t sender_ssrc,
const rtcp::ReportBlock& report_block,
Timestamp report_block_timestamp_utc);
Timestamp report_block_timestamp_utc,
Timestamp report_block_timestamp);
void AddRoundTripTimeSample(TimeDelta rtt);
private:
@ -107,7 +118,10 @@ class ReportBlockData {
int32_t cumulative_lost_ = 0;
uint32_t extended_highest_sequence_number_ = 0;
uint32_t jitter_ = 0;
// TODO(webrtc:370535296): When (webrtc:370535296) is fixed, we don't need the
// utc timestamp.
Timestamp report_block_timestamp_utc_ = Timestamp::Zero();
Timestamp report_block_timestamp_ = Timestamp::Zero();
TimeDelta last_rtt_ = TimeDelta::Zero();
TimeDelta sum_rtt_ = TimeDelta::Zero();
size_t num_rtts_ = 0;

2
modules/rtp_rtcp/source/rtcp_receiver.cc
View File

@ -624,7 +624,7 @@ void RTCPReceiver::HandleReportBlock(const ReportBlock& report_block,
// https://tools.ietf.org/html/rfc868).
report_block_data->SetReportBlock(
remote_ssrc, report_block,
Timestamp::Millis(now_ntp.ToMs() - rtc::kNtpJan1970Millisecs));
Timestamp::Millis(now_ntp.ToMs() - rtc::kNtpJan1970Millisecs), now);
uint32_t send_time_ntp = report_block.last_sr();
// RFC3550, section 6.4.1, LSR field discription states:

4
modules/rtp_rtcp/source/rtcp_transceiver_impl.cc
View File

@ -375,7 +375,7 @@ void RtcpTransceiverImpl::HandleReportBlocks(
auto sender_it = local_senders_by_ssrc_.find(block.source_ssrc());
if (sender_it != local_senders_by_ssrc_.end()) {
LocalSenderState& state = *sender_it->second;
state.report_block.SetReportBlock(sender_ssrc, block, now_utc);
state.report_block.SetReportBlock(sender_ssrc, block, now_utc, now);
if (rtt.has_value()) {
state.report_block.AddRoundTripTimeSample(*rtt);
}
@ -385,7 +385,7 @@ void RtcpTransceiverImpl::HandleReportBlocks(
// No registered sender for this report block, still report it to the
// network link.
ReportBlockData report_block;
report_block.SetReportBlock(sender_ssrc, block, now_utc);
report_block.SetReportBlock(sender_ssrc, block, now_utc, now);
if (rtt.has_value()) {
report_block.AddRoundTripTimeSample(*rtt);
}

2
pc/peer_connection.cc
View File

@ -762,7 +762,7 @@ RTCError PeerConnection::Initialize(
configuration_ = configuration;
legacy_stats_ = std::make_unique<LegacyStatsCollector>(this);
stats_collector_ = RTCStatsCollector::Create(this);
stats_collector_ = RTCStatsCollector::Create(this, env_);
sdp_handler_ =
SdpOfferAnswerHandler::Create(this, configuration, dependencies,

35
pc/rtc_stats_collector.cc
View File

@ -843,14 +843,18 @@ ProduceRemoteInboundRtpStreamStatsFromReportBlockData(
const ReportBlockData& report_block,
cricket::MediaType media_type,
const std::map<std::string, RTCOutboundRtpStreamStats*>& outbound_rtps,
const RTCStatsReport& report) {
const RTCStatsReport& report,
const bool stats_timestamp_with_environment_clock) {
// RTCStats' timestamp generally refers to when the metric was sampled, but
// for "remote-[outbound/inbound]-rtp" it refers to the local time when the
// Report Block was received.
Timestamp arrival_timestamp = stats_timestamp_with_environment_clock
? report_block.report_block_timestamp()
: report_block.report_block_timestamp_utc();
auto remote_inbound = std::make_unique<RTCRemoteInboundRtpStreamStats>(
RTCRemoteInboundRtpStreamStatsIdFromSourceSsrc(
media_type, report_block.source_ssrc()),
report_block.report_block_timestamp_utc());
arrival_timestamp);
remote_inbound->ssrc = report_block.source_ssrc();
remote_inbound->kind =
media_type == cricket::MEDIA_TYPE_AUDIO ? "audio" : "video";
@ -1114,13 +1118,18 @@ RTCStatsCollector::RequestInfo::RequestInfo(
rtc::scoped_refptr<RTCStatsCollector> RTCStatsCollector::Create(
PeerConnectionInternal* pc,
const Environment& env,
int64_t cache_lifetime_us) {
return rtc::make_ref_counted<RTCStatsCollector>(pc, cache_lifetime_us);
return rtc::make_ref_counted<RTCStatsCollector>(pc, env, cache_lifetime_us);
}
RTCStatsCollector::RTCStatsCollector(PeerConnectionInternal* pc,
const Environment& env,
int64_t cache_lifetime_us)
: pc_(pc),
env_(env),
stats_timestamp_with_environment_clock_(
pc->GetConfiguration().stats_timestamp_with_environment_clock()),
signaling_thread_(pc->signaling_thread()),
worker_thread_(pc->worker_thread()),
network_thread_(pc->network_thread()),
@ -1179,10 +1188,16 @@ void RTCStatsCollector::GetStatsReportInternal(
// case of already gathering stats, `callback_` will be invoked when there
// are no more pending partial reports.
// "Now" using a system clock, relative to the UNIX epoch (Jan 1, 1970,
// UTC), in microseconds. The system clock could be modified and is not
// necessarily monotonically increasing.
Timestamp timestamp = Timestamp::Micros(rtc::TimeUTCMicros());
Timestamp timestamp =
stats_timestamp_with_environment_clock_
?
// "Now" using a monotonically increasing timer.
env_.clock().CurrentTime()
:
// "Now" using a system clock, relative to the UNIX epoch (Jan 1,
// 1970, UTC), in microseconds. The system clock could be modified
// and is not necessarily monotonically increasing.
Timestamp::Micros(rtc::TimeUTCMicros());
num_pending_partial_reports_ = 2;
partial_report_timestamp_us_ = cache_now_us;
@ -1767,7 +1782,8 @@ void RTCStatsCollector::ProduceAudioRTPStreamStats_n(
for (const auto& report_block_data : voice_sender_info.report_block_datas) {
report->AddStats(ProduceRemoteInboundRtpStreamStatsFromReportBlockData(
transport_id, report_block_data, cricket::MEDIA_TYPE_AUDIO,
audio_outbound_rtps, *report));
audio_outbound_rtps, *report,
stats_timestamp_with_environment_clock_));
}
}
}
@ -1861,7 +1877,8 @@ void RTCStatsCollector::ProduceVideoRTPStreamStats_n(
for (const auto& report_block_data : video_sender_info.report_block_datas) {
report->AddStats(ProduceRemoteInboundRtpStreamStatsFromReportBlockData(
transport_id, report_block_data, cricket::MEDIA_TYPE_VIDEO,
video_outbound_rtps, *report));
video_outbound_rtps, *report,
stats_timestamp_with_environment_clock_));
}
}
}

7
pc/rtc_stats_collector.h
View File

@ -60,6 +60,7 @@ class RTCStatsCollector : public RefCountInterface {
public:
static rtc::scoped_refptr<RTCStatsCollector> Create(
PeerConnectionInternal* pc,
const Environment& env,
int64_t cache_lifetime_us = 50 * rtc::kNumMicrosecsPerMillisec);
// Gets a recent stats report. If there is a report cached that is still fresh
@ -95,7 +96,9 @@ class RTCStatsCollector : public RefCountInterface {
DataChannelInterface::DataState state);
protected:
RTCStatsCollector(PeerConnectionInternal* pc, int64_t cache_lifetime_us);
RTCStatsCollector(PeerConnectionInternal* pc,
const Environment& env,
int64_t cache_lifetime_us);
~RTCStatsCollector();
struct CertificateStatsPair {
@ -252,6 +255,8 @@ class RTCStatsCollector : public RefCountInterface {
rtc::scoped_refptr<RtpReceiverInternal> receiver_selector);
PeerConnectionInternal* const pc_;
const Environment env_;
const bool stats_timestamp_with_environment_clock_;
rtc::Thread* const signaling_thread_;
rtc::Thread* const worker_thread_;
rtc::Thread* const network_thread_;

37
pc/rtc_stats_collector_unittest.cc
View File

@ -427,10 +427,12 @@ rtc::scoped_refptr<MockRtpReceiverInternal> CreateMockReceiver(
class RTCStatsCollectorWrapper {
public:
explicit RTCStatsCollectorWrapper(
rtc::scoped_refptr<FakePeerConnectionForStats> pc)
rtc::scoped_refptr<FakePeerConnectionForStats> pc,
const Environment& env)
: pc_(pc),
stats_collector_(
RTCStatsCollector::Create(pc.get(),
env,
50 * rtc::kNumMicrosecsPerMillisec)) {}
rtc::scoped_refptr<RTCStatsCollector> stats_collector() {
@ -662,7 +664,7 @@ class RTCStatsCollectorTest : public ::testing::Test {
public:
RTCStatsCollectorTest()
: pc_(rtc::make_ref_counted<FakePeerConnectionForStats>()),
stats_(new RTCStatsCollectorWrapper(pc_)),
stats_(new RTCStatsCollectorWrapper(pc_, CreateEnvironment())),
data_channel_controller_(
new FakeDataChannelController(pc_->network_thread())) {}
@ -3294,6 +3296,7 @@ class RTCStatsCollectorTestWithParamKind
TEST_P(RTCStatsCollectorTestWithParamKind,
RTCRemoteInboundRtpStreamStatsCollectedFromReportBlock) {
const Timestamp kReportBlockTimestampUtc = Timestamp::Micros(123456789);
const Timestamp kReportBlockTimestamp = Timestamp::Micros(12345678);
const uint8_t kFractionLost = 12;
const TimeDelta kRoundTripTimeSample1 = TimeDelta::Millis(1'234);
const TimeDelta kRoundTripTimeSample2 = TimeDelta::Seconds(13);
@ -3311,7 +3314,8 @@ TEST_P(RTCStatsCollectorTestWithParamKind,
report_block.SetCumulativeLost(7);
report_block.SetFractionLost(kFractionLost);
ReportBlockData report_block_data;
report_block_data.SetReportBlock(0, report_block, kReportBlockTimestampUtc);
report_block_data.SetReportBlock(0, report_block, kReportBlockTimestampUtc,
kReportBlockTimestamp);
report_block_data.AddRoundTripTimeSample(kRoundTripTimeSample1);
// Only the last sample should be exposed as the
// `RTCRemoteInboundRtpStreamStats::round_trip_time`.
@ -3361,13 +3365,15 @@ TEST_P(RTCStatsCollectorTestWithParamKind,
TEST_P(RTCStatsCollectorTestWithParamKind,
RTCRemoteInboundRtpStreamStatsRttMissingBeforeMeasurement) {
constexpr Timestamp kReportBlockTimestampUtc = Timestamp::Micros(123456789);
const Timestamp kReportBlockTimestamp = Timestamp::Micros(12345678);
rtcp::ReportBlock report_block;
// The remote-inbound-rtp SSRC and the outbound-rtp SSRC is the same as the
// `source_ssrc`, "SSRC of the RTP packet sender".
report_block.SetMediaSsrc(12);
ReportBlockData report_block_data; // AddRoundTripTimeSample() not called.
report_block_data.SetReportBlock(0, report_block, kReportBlockTimestampUtc);
report_block_data.SetReportBlock(0, report_block, kReportBlockTimestampUtc,
kReportBlockTimestamp);
AddSenderInfoAndMediaChannel("TransportName", {report_block_data},
std::nullopt);
@ -3387,6 +3393,7 @@ TEST_P(RTCStatsCollectorTestWithParamKind,
TEST_P(RTCStatsCollectorTestWithParamKind,
RTCRemoteInboundRtpStreamStatsWithTimestampFromReportBlock) {
const Timestamp kReportBlockTimestampUtc = Timestamp::Micros(123456789);
const Timestamp kReportBlockTimestamp = Timestamp::Micros(12345678);
fake_clock_.SetTime(kReportBlockTimestampUtc);
rtcp::ReportBlock report_block;
@ -3394,7 +3401,8 @@ TEST_P(RTCStatsCollectorTestWithParamKind,
// `source_ssrc`, "SSRC of the RTP packet sender".
report_block.SetMediaSsrc(12);
ReportBlockData report_block_data;
report_block_data.SetReportBlock(0, report_block, kReportBlockTimestampUtc);
report_block_data.SetReportBlock(0, report_block, kReportBlockTimestampUtc,
kReportBlockTimestamp);
AddSenderInfoAndMediaChannel("TransportName", {report_block_data},
std::nullopt);
@ -3419,6 +3427,7 @@ TEST_P(RTCStatsCollectorTestWithParamKind,
TEST_P(RTCStatsCollectorTestWithParamKind,
RTCRemoteInboundRtpStreamStatsWithCodecBasedMembers) {
const Timestamp kReportBlockTimestampUtc = Timestamp::Micros(123456789);
const Timestamp kReportBlockTimestamp = Timestamp::Micros(12345678);
fake_clock_.SetTime(kReportBlockTimestampUtc);
rtcp::ReportBlock report_block;
@ -3427,7 +3436,8 @@ TEST_P(RTCStatsCollectorTestWithParamKind,
report_block.SetMediaSsrc(12);
report_block.SetJitter(5000);
ReportBlockData report_block_data;
report_block_data.SetReportBlock(0, report_block, kReportBlockTimestampUtc);
report_block_data.SetReportBlock(0, report_block, kReportBlockTimestampUtc,
kReportBlockTimestamp);
RtpCodecParameters codec;
codec.payload_type = 3;
@ -3455,6 +3465,7 @@ TEST_P(RTCStatsCollectorTestWithParamKind,
TEST_P(RTCStatsCollectorTestWithParamKind,
RTCRemoteInboundRtpStreamStatsWithRtcpTransport) {
const Timestamp kReportBlockTimestampUtc = Timestamp::Micros(123456789);
const Timestamp kReportBlockTimestamp = Timestamp::Micros(12345678);
fake_clock_.SetTime(kReportBlockTimestampUtc);
rtcp::ReportBlock report_block;
@ -3462,7 +3473,8 @@ TEST_P(RTCStatsCollectorTestWithParamKind,
// `source_ssrc`, "SSRC of the RTP packet sender".
report_block.SetMediaSsrc(12);
ReportBlockData report_block_data;
report_block_data.SetReportBlock(0, report_block, kReportBlockTimestampUtc);
report_block_data.SetReportBlock(0, report_block, kReportBlockTimestampUtc,
kReportBlockTimestamp);
cricket::TransportChannelStats rtp_transport_channel_stats;
rtp_transport_channel_stats.component = cricket::ICE_CANDIDATE_COMPONENT_RTP;
@ -3747,9 +3759,10 @@ class FakeRTCStatsCollector : public RTCStatsCollector,
public:
static rtc::scoped_refptr<FakeRTCStatsCollector> Create(
PeerConnectionInternal* pc,
const Environment& env,
int64_t cache_lifetime_us) {
return rtc::scoped_refptr<FakeRTCStatsCollector>(
new rtc::RefCountedObject<FakeRTCStatsCollector>(pc,
new rtc::RefCountedObject<FakeRTCStatsCollector>(pc, env,
cache_lifetime_us));
}
@ -3794,8 +3807,10 @@ class FakeRTCStatsCollector : public RTCStatsCollector,
}
protected:
FakeRTCStatsCollector(PeerConnectionInternal* pc, int64_t cache_lifetime)
: RTCStatsCollector(pc, cache_lifetime),
FakeRTCStatsCollector(PeerConnectionInternal* pc,
const Environment& env,
int64_t cache_lifetime)
: RTCStatsCollector(pc, env, cache_lifetime),
signaling_thread_(pc->signaling_thread()),
worker_thread_(pc->worker_thread()),
network_thread_(pc->network_thread()) {}
@ -3845,7 +3860,7 @@ TEST(RTCStatsCollectorTestWithFakeCollector, ThreadUsageAndResultsMerging) {
rtc::AutoThread main_thread_;
auto pc = rtc::make_ref_counted<FakePeerConnectionForStats>();
rtc::scoped_refptr<FakeRTCStatsCollector> stats_collector(
FakeRTCStatsCollector::Create(pc.get(),
FakeRTCStatsCollector::Create(pc.get(), CreateEnvironment(),
50 * rtc::kNumMicrosecsPerMillisec));
stats_collector->VerifyThreadUsageAndResultsMerging();
}

10
video/send_statistics_proxy_unittest.cc
View File

@ -199,7 +199,8 @@ TEST_F(SendStatisticsProxyTest, ReportBlockDataObserver) {
report_block.SetFractionLost(offset + 2);
report_block.SetJitter(offset + 3);
ReportBlockData data;
data.SetReportBlock(/*sender_ssrc=*/0, report_block, Timestamp::Zero());
data.SetReportBlock(/*sender_ssrc=*/0, report_block, Timestamp::Zero(),
Timestamp::Zero());
expected_.substreams[ssrc].report_block_data = data;
callback->OnReportBlockDataUpdated(data);
@ -214,7 +215,8 @@ TEST_F(SendStatisticsProxyTest, ReportBlockDataObserver) {
report_block.SetFractionLost(offset + 2);
report_block.SetJitter(offset + 3);
ReportBlockData data;
data.SetReportBlock(/*sender_ssrc=*/0, report_block, Timestamp::Zero());
data.SetReportBlock(/*sender_ssrc=*/0, report_block, Timestamp::Zero(),
Timestamp::Zero());
expected_.substreams[ssrc].report_block_data = data;
callback->OnReportBlockDataUpdated(data);
@ -2319,7 +2321,7 @@ TEST_F(SendStatisticsProxyTest, NoSubstreams) {
rtcp::ReportBlock report_block;
report_block.SetMediaSsrc(excluded_ssrc);
ReportBlockData data;
data.SetReportBlock(0, report_block, Timestamp::Zero());
data.SetReportBlock(0, report_block, Timestamp::Zero(), Timestamp::Zero());
rtcp_callback->OnReportBlockDataUpdated(data);
// From BitrateStatisticsObserver.
@ -2372,7 +2374,7 @@ TEST_F(SendStatisticsProxyTest, EncodedResolutionTimesOut) {
rtcp::ReportBlock report_block;
report_block.SetMediaSsrc(config_.rtp.ssrcs[0]);
ReportBlockData data;
data.SetReportBlock(0, report_block, Timestamp::Zero());
data.SetReportBlock(0, report_block, Timestamp::Zero(), Timestamp::Zero());
rtcp_callback->OnReportBlockDataUpdated(data);
// Report stats for second SSRC to make sure it's not outdated along with the