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// 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.
#include "third_party/blink/renderer/modules/peerconnection/peer_connection_util.h"
#include <cstdint>
#include <cstdlib>
#include <ctime>
#include <vector>
#include "base/time/time.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_binding_for_testing.h"
#include "third_party/blink/renderer/core/dom/dom_high_res_time_stamp.h"
#include "third_party/blink/renderer/core/timing/dom_window_performance.h"
#include "third_party/blink/renderer/platform/testing/task_environment.h"
namespace blink {
namespace {
base::TimeTicks GetTimeOriginTimeTicks(V8TestingScope& v8_scope) {
return DOMWindowPerformance::performance(v8_scope.GetWindow())
->GetTimeOriginInternal();
}
DOMHighResTimeStamp GetTimeOriginNtp(V8TestingScope& v8_scope) {
return DOMWindowPerformance::performance(v8_scope.GetWindow())->timeOrigin() +
2208988800000.0;
}
} // namespace
TEST(PeerConnectionUtilTest, RTCEncodedFrameTimestampFromTimeTicks) {
test::TaskEnvironment task_environment;
V8TestingScope v8_scope;
// Use timestamps precise to 0.1ms, since that is the precision of
// DOMHighResTimeStamp without cross-origin isolation.
std::vector<double> timestamps_ms = {123.4, -123.4};
for (double timestamp_ms : timestamps_ms) {
DOMHighResTimeStamp timestamp = RTCEncodedFrameTimestampFromTimeTicks(
v8_scope.GetExecutionContext(),
GetTimeOriginTimeTicks(v8_scope) + base::Milliseconds(timestamp_ms));
// Use 0.2ms as tolerance to account for the 0.1ms precision.
EXPECT_LE(std::abs(timestamp - timestamp_ms), 0.2);
}
}
TEST(PeerConnectionUtilTest, CalculateRTCEncodedFrameTimeDelta) {
test::TaskEnvironment task_environment;
V8TestingScope v8_scope;
// Use timestamps precise to 0.1ms, since that is the precision of
// DOMHighResTimeStamp without cross-origin isolation.
std::vector<double> timedeltas_ms = {123.4, -123.4};
for (double timedelta_ms : timedeltas_ms) {
DOMHighResTimeStamp timestamp = CalculateRTCEncodedFrameTimeDelta(
v8_scope.GetExecutionContext(), base::Milliseconds(timedelta_ms));
// Use 0.2ms as tolerance to account for the 0.1ms precision.
EXPECT_LE(std::abs(timestamp - timedelta_ms), 0.2);
}
}
TEST(PeerConnectionUtilTest,
RTCEncodedFrameTimestampFromCaptureTimeInfoTimeTicks) {
test::TaskEnvironment task_environment;
V8TestingScope v8_scope;
std::vector<double> timestamps_ms = {123.4, -123.4};
for (double timestamp_ms : timestamps_ms) {
DOMHighResTimeStamp timestamp = RTCEncodedFrameTimestampFromCaptureTimeInfo(
v8_scope.GetExecutionContext(),
{.capture_time = (GetTimeOriginTimeTicks(v8_scope) +
base::Milliseconds(timestamp_ms))
.since_origin(),
.clock_type = CaptureTimeInfo::ClockType::kTimeTicks});
// Use 0.2ms as tolerance to account for the 0.1ms precision.
EXPECT_LE(std::abs(timestamp - timestamp_ms), 0.2);
}
}
TEST(PeerConnectionUtilTest, RTCEncodedFrameTimestampFromCaptureTimeInfoNtp) {
test::TaskEnvironment task_environment;
V8TestingScope v8_scope;
std::vector<double> timestamps_ms = {123.4, -123.4};
for (double timestamp_ms : timestamps_ms) {
DOMHighResTimeStamp timestamp = RTCEncodedFrameTimestampFromCaptureTimeInfo(
v8_scope.GetExecutionContext(),
{.capture_time = base::Milliseconds(timestamp_ms),
.clock_type = CaptureTimeInfo::ClockType::kNtpRealClock});
DOMHighResTimeStamp expected_timestamp =
timestamp_ms - GetTimeOriginNtp(v8_scope);
// Use 0.2ms as tolerance to account for the 0.1ms precision.
EXPECT_LE(std::abs(timestamp - expected_timestamp), 0.2);
}
}
TEST(PeerConnectionUtilTest, RTCEncodedFrameTimestampToCaptureTimeTimeTicks) {
test::TaskEnvironment task_environment;
V8TestingScope v8_scope;
std::vector<double> timestamps_ms = {123.456, -123.456};
for (double timestamp_ms : timestamps_ms) {
base::TimeDelta capture_time = RTCEncodedFrameTimestampToCaptureTime(
v8_scope.GetExecutionContext(), timestamp_ms,
CaptureTimeInfo::ClockType::kTimeTicks);
base::TimeDelta expected_time =
GetTimeOriginTimeTicks(v8_scope).since_origin() +
base::Milliseconds(timestamp_ms);
EXPECT_LE((capture_time - expected_time).magnitude(),
base::Milliseconds(0.2));
}
}
TEST(PeerConnectionUtilTest, RTCEncodedFrameTimestampToCaptureTimeNtp) {
test::TaskEnvironment task_environment;
V8TestingScope v8_scope;
std::vector<double> timestamps_ms = {123.456, -123.456};
for (double timestamp_ms : timestamps_ms) {
base::TimeDelta capture_time = RTCEncodedFrameTimestampToCaptureTime(
v8_scope.GetExecutionContext(), timestamp_ms,
CaptureTimeInfo::ClockType::kNtpRealClock);
base::TimeDelta expected_time =
base::Milliseconds(GetTimeOriginNtp(v8_scope)) +
base::Milliseconds(timestamp_ms);
EXPECT_LE((capture_time - expected_time).magnitude(),
base::Milliseconds(0.2));
}
}
TEST(PeerConnectionUtilTest, AudioLevelConversionRangeEndpoints) {
EXPECT_EQ(ToLinearAudioLevel(0u), 1.0);
EXPECT_EQ(ToLinearAudioLevel(127u), 0.0);
EXPECT_EQ(FromLinearAudioLevel(1.0), 0u);
EXPECT_EQ(FromLinearAudioLevel(0.0), 127u);
}
TEST(PeerConnectionUtilTest, AudioLevelConversionOutsideRange) {
EXPECT_EQ(FromLinearAudioLevel(1.1), 0u);
EXPECT_EQ(FromLinearAudioLevel(-0.1), 127u);
}
TEST(PeerConnectionUtilTest,
AudioLevelConversionFromSmallLinearValueIsSilence) {
EXPECT_EQ(FromLinearAudioLevel(1e-30), 127u);
}
TEST(PeerConnectionUtilTest, AudioLevelConversionFromLinearIsNotTooLossy) {
constexpr double linear_audio_level = 0.34;
double converted_linear_audio_level =
ToLinearAudioLevel(FromLinearAudioLevel(linear_audio_level));
EXPECT_LE(std::abs(linear_audio_level - converted_linear_audio_level) /
linear_audio_level,
0.1);
}
TEST(PeerConnectionUtilTest, AudioLevelConversionFromUintIsLossless) {
constexpr uint8_t audio_level_dbov = 34u;
double converted_audio_level_dbov =
FromLinearAudioLevel(ToLinearAudioLevel(audio_level_dbov));
EXPECT_EQ(audio_level_dbov, converted_audio_level_dbov);
}
} // namespace blink
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