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Unified Diff: content/browser/media/capture/video_capture_oracle_unittest.cc

Issue 1109603003: Clean-up: Break sampler classes into their own files. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 5 years, 8 months ago
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Index: content/browser/media/capture/video_capture_oracle_unittest.cc
diff --git a/content/browser/media/capture/video_capture_oracle_unittest.cc b/content/browser/media/capture/video_capture_oracle_unittest.cc
index 630e081bec37ec043b76a3d4783ab967aa7f4d43..456bc515aa87fe92b8fe5cd8801cda31a55b9d46 100644
--- a/content/browser/media/capture/video_capture_oracle_unittest.cc
+++ b/content/browser/media/capture/video_capture_oracle_unittest.cc
@@ -4,1055 +4,19 @@
#include "content/browser/media/capture/video_capture_oracle.h"
-#include <cstdlib>
-#include <utility>
-#include <vector>
-
-#include "base/logging.h"
#include "base/strings/stringprintf.h"
-#include "base/time/time.h"
#include "testing/gtest/include/gtest/gtest.h"
-#include "ui/gfx/geometry/rect.h"
namespace content {
-namespace {
-
-bool AddEventAndConsiderSampling(SmoothEventSampler* sampler,
- base::TimeTicks event_time) {
- sampler->ConsiderPresentationEvent(event_time);
- return sampler->ShouldSample();
-}
-void SteadyStateSampleAndAdvance(base::TimeDelta vsync,
- SmoothEventSampler* sampler,
- base::TimeTicks* t) {
- ASSERT_TRUE(AddEventAndConsiderSampling(sampler, *t));
- ASSERT_TRUE(sampler->HasUnrecordedEvent());
- sampler->RecordSample();
- ASSERT_FALSE(sampler->HasUnrecordedEvent());
- ASSERT_FALSE(sampler->IsOverdueForSamplingAt(*t));
- *t += vsync;
- ASSERT_FALSE(sampler->IsOverdueForSamplingAt(*t));
-}
-
-void SteadyStateNoSampleAndAdvance(base::TimeDelta vsync,
- SmoothEventSampler* sampler,
- base::TimeTicks* t) {
- ASSERT_FALSE(AddEventAndConsiderSampling(sampler, *t));
- ASSERT_TRUE(sampler->HasUnrecordedEvent());
- ASSERT_FALSE(sampler->IsOverdueForSamplingAt(*t));
- *t += vsync;
- ASSERT_FALSE(sampler->IsOverdueForSamplingAt(*t));
-}
+namespace {
base::TimeTicks InitialTestTimeTicks() {
return base::TimeTicks() + base::TimeDelta::FromSeconds(1);
}
-void TestRedundantCaptureStrategy(base::TimeDelta capture_period,
- int redundant_capture_goal,
- SmoothEventSampler* sampler,
- base::TimeTicks* t) {
- // Before any events have been considered, we're overdue for sampling.
- ASSERT_TRUE(sampler->IsOverdueForSamplingAt(*t));
-
- // Consider the first event. We want to sample that.
- ASSERT_FALSE(sampler->HasUnrecordedEvent());
- ASSERT_TRUE(AddEventAndConsiderSampling(sampler, *t));
- ASSERT_TRUE(sampler->HasUnrecordedEvent());
- sampler->RecordSample();
- ASSERT_FALSE(sampler->HasUnrecordedEvent());
-
- // After more than 250 ms has passed without considering an event, we should
- // repeatedly be overdue for sampling. However, once the redundant capture
- // goal is achieved, we should no longer be overdue for sampling.
- *t += base::TimeDelta::FromMilliseconds(250);
- for (int i = 0; i < redundant_capture_goal; i++) {
- SCOPED_TRACE(base::StringPrintf("Iteration %d", i));
- ASSERT_FALSE(sampler->HasUnrecordedEvent());
- ASSERT_TRUE(sampler->IsOverdueForSamplingAt(*t))
- << "Should sample until redundant capture goal is hit";
- sampler->RecordSample();
- *t += capture_period; // Timer fires once every capture period.
- }
- ASSERT_FALSE(sampler->IsOverdueForSamplingAt(*t))
- << "Should not be overdue once redundant capture goal achieved.";
-}
-
-} // namespace
-
-// 60Hz sampled at 30Hz should produce 30Hz. In addition, this test contains
-// much more comprehensive before/after/edge-case scenarios than the others.
-TEST(SmoothEventSamplerTest, Sample60HertzAt30Hertz) {
- const base::TimeDelta capture_period = base::TimeDelta::FromSeconds(1) / 30;
- const int redundant_capture_goal = 200;
- const base::TimeDelta vsync = base::TimeDelta::FromSeconds(1) / 60;
-
- SmoothEventSampler sampler(capture_period, redundant_capture_goal);
- base::TimeTicks t = InitialTestTimeTicks();
-
- TestRedundantCaptureStrategy(capture_period, redundant_capture_goal,
- &sampler, &t);
-
- // Steady state, we should capture every other vsync, indefinitely.
- for (int i = 0; i < 100; i++) {
- SCOPED_TRACE(base::StringPrintf("Iteration %d", i));
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateNoSampleAndAdvance(vsync, &sampler, &t);
- }
-
- // Now pretend we're limited by backpressure in the pipeline. In this scenario
- // case we are adding events but not sampling them.
- for (int i = 0; i < 20; i++) {
- SCOPED_TRACE(base::StringPrintf("Iteration %d", i));
- ASSERT_EQ(i >= 14, sampler.IsOverdueForSamplingAt(t));
- ASSERT_TRUE(AddEventAndConsiderSampling(&sampler, t));
- ASSERT_TRUE(sampler.HasUnrecordedEvent());
- t += vsync;
- }
-
- // Now suppose we can sample again. We should be back in the steady state,
- // but at a different phase.
- ASSERT_TRUE(sampler.IsOverdueForSamplingAt(t));
- for (int i = 0; i < 100; i++) {
- SCOPED_TRACE(base::StringPrintf("Iteration %d", i));
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateNoSampleAndAdvance(vsync, &sampler, &t);
- }
-}
-
-// 50Hz sampled at 30Hz should produce a sequence where some frames are skipped.
-TEST(SmoothEventSamplerTest, Sample50HertzAt30Hertz) {
- const base::TimeDelta capture_period = base::TimeDelta::FromSeconds(1) / 30;
- const int redundant_capture_goal = 2;
- const base::TimeDelta vsync = base::TimeDelta::FromSeconds(1) / 50;
-
- SmoothEventSampler sampler(capture_period, redundant_capture_goal);
- base::TimeTicks t = InitialTestTimeTicks();
-
- TestRedundantCaptureStrategy(capture_period, redundant_capture_goal,
- &sampler, &t);
-
- // Steady state, we should capture 1st, 2nd and 4th frames out of every five
- // frames, indefinitely.
- for (int i = 0; i < 100; i++) {
- SCOPED_TRACE(base::StringPrintf("Iteration %d", i));
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateNoSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateNoSampleAndAdvance(vsync, &sampler, &t);
- }
-
- // Now pretend we're limited by backpressure in the pipeline. In this scenario
- // case we are adding events but not sampling them.
- for (int i = 0; i < 20; i++) {
- SCOPED_TRACE(base::StringPrintf("Iteration %d", i));
- ASSERT_EQ(i >= 11, sampler.IsOverdueForSamplingAt(t));
- ASSERT_TRUE(AddEventAndConsiderSampling(&sampler, t));
- t += vsync;
- }
-
- // Now suppose we can sample again. We should be back in the steady state
- // again.
- ASSERT_TRUE(sampler.IsOverdueForSamplingAt(t));
- for (int i = 0; i < 100; i++) {
- SCOPED_TRACE(base::StringPrintf("Iteration %d", i));
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateNoSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateNoSampleAndAdvance(vsync, &sampler, &t);
- }
-}
-
-// 75Hz sampled at 30Hz should produce a sequence where some frames are skipped.
-TEST(SmoothEventSamplerTest, Sample75HertzAt30Hertz) {
- const base::TimeDelta capture_period = base::TimeDelta::FromSeconds(1) / 30;
- const int redundant_capture_goal = 32;
- const base::TimeDelta vsync = base::TimeDelta::FromSeconds(1) / 75;
-
- SmoothEventSampler sampler(capture_period, redundant_capture_goal);
- base::TimeTicks t = InitialTestTimeTicks();
-
- TestRedundantCaptureStrategy(capture_period, redundant_capture_goal,
- &sampler, &t);
-
- // Steady state, we should capture 1st and 3rd frames out of every five
- // frames, indefinitely.
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateNoSampleAndAdvance(vsync, &sampler, &t);
- for (int i = 0; i < 100; i++) {
- SCOPED_TRACE(base::StringPrintf("Iteration %d", i));
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateNoSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateNoSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateNoSampleAndAdvance(vsync, &sampler, &t);
- }
-
- // Now pretend we're limited by backpressure in the pipeline. In this scenario
- // case we are adding events but not sampling them.
- for (int i = 0; i < 20; i++) {
- SCOPED_TRACE(base::StringPrintf("Iteration %d", i));
- ASSERT_EQ(i >= 16, sampler.IsOverdueForSamplingAt(t));
- ASSERT_TRUE(AddEventAndConsiderSampling(&sampler, t));
- t += vsync;
- }
-
- // Now suppose we can sample again. We capture the next frame, and not the one
- // after that, and then we're back in the steady state again.
- ASSERT_TRUE(sampler.IsOverdueForSamplingAt(t));
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateNoSampleAndAdvance(vsync, &sampler, &t);
- for (int i = 0; i < 100; i++) {
- SCOPED_TRACE(base::StringPrintf("Iteration %d", i));
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateNoSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateNoSampleAndAdvance(vsync, &sampler, &t);
- SteadyStateNoSampleAndAdvance(vsync, &sampler, &t);
- }
-}
-
-// 30Hz sampled at 30Hz should produce 30Hz.
-TEST(SmoothEventSamplerTest, Sample30HertzAt30Hertz) {
- const base::TimeDelta capture_period = base::TimeDelta::FromSeconds(1) / 30;
- const int redundant_capture_goal = 1;
- const base::TimeDelta vsync = base::TimeDelta::FromSeconds(1) / 30;
-
- SmoothEventSampler sampler(capture_period, redundant_capture_goal);
- base::TimeTicks t = InitialTestTimeTicks();
-
- TestRedundantCaptureStrategy(capture_period, redundant_capture_goal,
- &sampler, &t);
-
- // Steady state, we should capture every vsync, indefinitely.
- for (int i = 0; i < 200; i++) {
- SCOPED_TRACE(base::StringPrintf("Iteration %d", i));
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- }
-
- // Now pretend we're limited by backpressure in the pipeline. In this scenario
- // case we are adding events but not sampling them.
- for (int i = 0; i < 10; i++) {
- SCOPED_TRACE(base::StringPrintf("Iteration %d", i));
- ASSERT_EQ(i >= 7, sampler.IsOverdueForSamplingAt(t));
- ASSERT_TRUE(AddEventAndConsiderSampling(&sampler, t));
- t += vsync;
- }
-
- // Now suppose we can sample again. We should be back in the steady state.
- ASSERT_TRUE(sampler.IsOverdueForSamplingAt(t));
- for (int i = 0; i < 100; i++) {
- SCOPED_TRACE(base::StringPrintf("Iteration %d", i));
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- }
-}
-
-// 24Hz sampled at 30Hz should produce 24Hz.
-TEST(SmoothEventSamplerTest, Sample24HertzAt30Hertz) {
- const base::TimeDelta capture_period = base::TimeDelta::FromSeconds(1) / 30;
- const int redundant_capture_goal = 333;
- const base::TimeDelta vsync = base::TimeDelta::FromSeconds(1) / 24;
-
- SmoothEventSampler sampler(capture_period, redundant_capture_goal);
- base::TimeTicks t = InitialTestTimeTicks();
-
- TestRedundantCaptureStrategy(capture_period, redundant_capture_goal,
- &sampler, &t);
-
- // Steady state, we should capture every vsync, indefinitely.
- for (int i = 0; i < 200; i++) {
- SCOPED_TRACE(base::StringPrintf("Iteration %d", i));
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- }
-
- // Now pretend we're limited by backpressure in the pipeline. In this scenario
- // case we are adding events but not sampling them.
- for (int i = 0; i < 10; i++) {
- SCOPED_TRACE(base::StringPrintf("Iteration %d", i));
- ASSERT_EQ(i >= 6, sampler.IsOverdueForSamplingAt(t));
- ASSERT_TRUE(AddEventAndConsiderSampling(&sampler, t));
- t += vsync;
- }
-
- // Now suppose we can sample again. We should be back in the steady state.
- ASSERT_TRUE(sampler.IsOverdueForSamplingAt(t));
- for (int i = 0; i < 100; i++) {
- SCOPED_TRACE(base::StringPrintf("Iteration %d", i));
- SteadyStateSampleAndAdvance(vsync, &sampler, &t);
- }
-}
-
-TEST(SmoothEventSamplerTest, DoubleDrawAtOneTimeStillDirties) {
- const base::TimeDelta capture_period = base::TimeDelta::FromSeconds(1) / 30;
- const base::TimeDelta overdue_period = base::TimeDelta::FromSeconds(1);
-
- SmoothEventSampler sampler(capture_period, 1);
- base::TimeTicks t = InitialTestTimeTicks();
-
- ASSERT_TRUE(AddEventAndConsiderSampling(&sampler, t));
- sampler.RecordSample();
- ASSERT_FALSE(sampler.IsOverdueForSamplingAt(t))
- << "Sampled last event; should not be dirty.";
- t += overdue_period;
-
- // Now simulate 2 events with the same clock value.
- ASSERT_TRUE(AddEventAndConsiderSampling(&sampler, t));
- sampler.RecordSample();
- ASSERT_FALSE(AddEventAndConsiderSampling(&sampler, t))
- << "Two events at same time -- expected second not to be sampled.";
- ASSERT_TRUE(sampler.IsOverdueForSamplingAt(t + overdue_period))
- << "Second event should dirty the capture state.";
- sampler.RecordSample();
- ASSERT_FALSE(sampler.IsOverdueForSamplingAt(t + overdue_period));
-}
-
-namespace {
-
-struct DataPoint {
- bool should_capture;
- double increment_ms;
-};
-
-void ReplayCheckingSamplerDecisions(const DataPoint* data_points,
- size_t num_data_points,
- SmoothEventSampler* sampler) {
- base::TimeTicks t = InitialTestTimeTicks();
- for (size_t i = 0; i < num_data_points; ++i) {
- t += base::TimeDelta::FromMicroseconds(
- static_cast<int64>(data_points[i].increment_ms * 1000));
- ASSERT_EQ(data_points[i].should_capture,
- AddEventAndConsiderSampling(sampler, t))
- << "at data_points[" << i << ']';
- if (data_points[i].should_capture)
- sampler->RecordSample();
- }
-}
-
-} // namespace
-
-TEST(SmoothEventSamplerTest, DrawingAt24FpsWith60HzVsyncSampledAt30Hertz) {
- // Actual capturing of timing data: Initial instability as a 24 FPS video was
- // started from a still screen, then clearly followed by steady-state.
- static const DataPoint data_points[] = {
- { true, 1437.93 }, { true, 150.484 }, { true, 217.362 }, { true, 50.161 },
- { true, 33.44 }, { false, 0 }, { true, 16.721 }, { true, 66.88 },
- { true, 50.161 }, { false, 0 }, { false, 0 }, { true, 50.16 },
- { true, 33.441 }, { true, 16.72 }, { false, 16.72 }, { true, 117.041 },
- { true, 16.72 }, { false, 16.72 }, { true, 50.161 }, { true, 50.16 },
- { true, 33.441 }, { true, 33.44 }, { true, 33.44 }, { true, 16.72 },
- { false, 0 }, { true, 50.161 }, { false, 0 }, { true, 33.44 },
- { true, 16.72 }, { false, 16.721 }, { true, 66.881 }, { false, 0 },
- { true, 33.441 }, { true, 16.72 }, { true, 50.16 }, { true, 16.72 },
- { false, 16.721 }, { true, 50.161 }, { true, 50.16 }, { false, 0 },
- { true, 33.441 }, { true, 50.337 }, { true, 50.183 }, { true, 16.722 },
- { true, 50.161 }, { true, 33.441 }, { true, 50.16 }, { true, 33.441 },
- { true, 50.16 }, { true, 33.441 }, { true, 50.16 }, { true, 33.44 },
- { true, 50.161 }, { true, 50.16 }, { true, 33.44 }, { true, 33.441 },
- { true, 50.16 }, { true, 50.161 }, { true, 33.44 }, { true, 33.441 },
- { true, 50.16 }, { true, 33.44 }, { true, 50.161 }, { true, 33.44 },
- { true, 50.161 }, { true, 33.44 }, { true, 50.161 }, { true, 33.44 },
- { true, 83.601 }, { true, 16.72 }, { true, 33.44 }, { false, 0 }
- };
-
- SmoothEventSampler sampler(base::TimeDelta::FromSeconds(1) / 30, 3);
- ReplayCheckingSamplerDecisions(data_points, arraysize(data_points), &sampler);
-}
-
-TEST(SmoothEventSamplerTest, DrawingAt30FpsWith60HzVsyncSampledAt30Hertz) {
- // Actual capturing of timing data: Initial instability as a 30 FPS video was
- // started from a still screen, then followed by steady-state. Drawing
- // framerate from the video rendering was a bit volatile, but averaged 30 FPS.
- static const DataPoint data_points[] = {
- { true, 2407.69 }, { true, 16.733 }, { true, 217.362 }, { true, 33.441 },
- { true, 33.44 }, { true, 33.44 }, { true, 33.441 }, { true, 33.44 },
- { true, 33.44 }, { true, 33.441 }, { true, 33.44 }, { true, 33.44 },
- { true, 16.721 }, { true, 33.44 }, { false, 0 }, { true, 50.161 },
- { true, 50.16 }, { false, 0 }, { true, 50.161 }, { true, 33.44 },
- { true, 16.72 }, { false, 0 }, { false, 16.72 }, { true, 66.881 },
- { false, 0 }, { true, 33.44 }, { true, 16.72 }, { true, 50.161 },
- { false, 0 }, { true, 33.538 }, { true, 33.526 }, { true, 33.447 },
- { true, 33.445 }, { true, 33.441 }, { true, 16.721 }, { true, 33.44 },
- { true, 33.44 }, { true, 50.161 }, { true, 16.72 }, { true, 33.44 },
- { true, 33.441 }, { true, 33.44 }, { false, 0 }, { false, 16.72 },
- { true, 66.881 }, { true, 16.72 }, { false, 16.72 }, { true, 50.16 },
- { true, 33.441 }, { true, 33.44 }, { true, 33.44 }, { true, 33.44 },
- { true, 33.441 }, { true, 33.44 }, { true, 50.161 }, { false, 0 },
- { true, 33.44 }, { true, 33.44 }, { true, 50.161 }, { true, 16.72 },
- { true, 33.44 }, { true, 33.441 }, { false, 0 }, { true, 66.88 },
- { true, 33.441 }, { true, 33.44 }, { true, 33.44 }, { false, 0 },
- { true, 33.441 }, { true, 33.44 }, { true, 33.44 }, { false, 0 },
- { true, 16.72 }, { true, 50.161 }, { false, 0 }, { true, 50.16 },
- { false, 0.001 }, { true, 16.721 }, { true, 66.88 }, { true, 33.44 },
- { true, 33.441 }, { true, 33.44 }, { true, 50.161 }, { true, 16.72 },
- { false, 0 }, { true, 33.44 }, { false, 16.72 }, { true, 66.881 },
- { true, 33.44 }, { true, 16.72 }, { true, 33.441 }, { false, 16.72 },
- { true, 66.88 }, { true, 16.721 }, { true, 50.16 }, { true, 33.44 },
- { true, 16.72 }, { true, 33.441 }, { true, 33.44 }, { true, 33.44 }
- };
-
- SmoothEventSampler sampler(base::TimeDelta::FromSeconds(1) / 30, 3);
- ReplayCheckingSamplerDecisions(data_points, arraysize(data_points), &sampler);
-}
-
-TEST(SmoothEventSamplerTest, DrawingAt60FpsWith60HzVsyncSampledAt30Hertz) {
- // Actual capturing of timing data: WebGL Acquarium demo
- // (http://webglsamples.googlecode.com/hg/aquarium/aquarium.html) which ran
- // between 55-60 FPS in the steady-state.
- static const DataPoint data_points[] = {
- { true, 16.72 }, { true, 16.72 }, { true, 4163.29 }, { true, 50.193 },
- { true, 117.041 }, { true, 50.161 }, { true, 50.16 }, { true, 33.441 },
- { true, 50.16 }, { true, 33.44 }, { false, 0 }, { false, 0 },
- { true, 50.161 }, { true, 83.601 }, { true, 50.16 }, { true, 16.72 },
- { true, 33.441 }, { false, 16.72 }, { true, 50.16 }, { true, 16.72 },
- { false, 0.001 }, { true, 33.441 }, { false, 16.72 }, { true, 16.72 },
- { true, 50.16 }, { false, 0 }, { true, 16.72 }, { true, 33.441 },
- { false, 0 }, { true, 33.44 }, { false, 16.72 }, { true, 16.72 },
- { true, 50.161 }, { false, 0 }, { true, 16.72 }, { true, 33.44 },
- { false, 0 }, { true, 33.44 }, { false, 16.721 }, { true, 16.721 },
- { true, 50.161 }, { false, 0 }, { true, 16.72 }, { true, 33.441 },
- { false, 0 }, { true, 33.44 }, { false, 16.72 }, { true, 33.44 },
- { false, 0 }, { true, 16.721 }, { true, 50.161 }, { false, 0 },
- { true, 33.44 }, { false, 0 }, { true, 16.72 }, { true, 33.441 },
- { false, 0 }, { true, 33.44 }, { false, 16.72 }, { true, 16.72 },
- { true, 50.16 }, { false, 0 }, { true, 16.721 }, { true, 33.44 },
- { false, 0 }, { true, 33.44 }, { false, 16.721 }, { true, 16.721 },
- { true, 50.161 }, { false, 0 }, { true, 16.72 }, { true, 33.44 },
- { false, 0 }, { true, 33.441 }, { false, 16.72 }, { true, 16.72 },
- { true, 50.16 }, { false, 0 }, { true, 16.72 }, { true, 33.441 },
- { true, 33.44 }, { false, 0 }, { true, 33.44 }, { true, 33.441 },
- { false, 0 }, { true, 33.44 }, { true, 33.441 }, { false, 0 },
- { true, 33.44 }, { false, 0 }, { true, 33.44 }, { false, 16.72 },
- { true, 16.721 }, { true, 50.161 }, { false, 0 }, { true, 16.72 },
- { true, 33.44 }, { true, 33.441 }, { false, 0 }, { true, 33.44 },
- { true, 33.44 }, { false, 0 }, { true, 33.441 }, { false, 16.72 },
- { true, 16.72 }, { true, 50.16 }, { false, 0 }, { true, 16.72 },
- { true, 33.441 }, { false, 0 }, { true, 33.44 }, { false, 16.72 },
- { true, 33.44 }, { false, 0 }, { true, 16.721 }, { true, 50.161 },
- { false, 0 }, { true, 16.72 }, { true, 33.44 }, { false, 0 },
- { true, 33.441 }, { false, 16.72 }, { true, 16.72 }, { true, 50.16 }
- };
-
- SmoothEventSampler sampler(base::TimeDelta::FromSeconds(1) / 30, 3);
- ReplayCheckingSamplerDecisions(data_points, arraysize(data_points), &sampler);
-}
-
-class AnimatedContentSamplerTest : public ::testing::Test {
- public:
- AnimatedContentSamplerTest() {}
- ~AnimatedContentSamplerTest() override {}
-
- void SetUp() override {
- const base::TimeDelta since_epoch =
- InitialTestTimeTicks() - base::TimeTicks::UnixEpoch();
- rand_seed_ = abs(static_cast<int>(since_epoch.InMicroseconds()));
- sampler_.reset(new AnimatedContentSampler(GetMinCapturePeriod()));
- }
-
- protected:
- // Overridden by subclass for parameterized tests.
- virtual base::TimeDelta GetMinCapturePeriod() const {
- return base::TimeDelta::FromSeconds(1) / 30;
- }
-
- AnimatedContentSampler* sampler() const {
- return sampler_.get();
- }
-
- int GetRandomInRange(int begin, int end) {
- const int len = end - begin;
- const int rand_offset = (len == 0) ? 0 : (NextRandomInt() % (end - begin));
- return begin + rand_offset;
- }
-
- gfx::Rect GetRandomDamageRect() {
- return gfx::Rect(0, 0, GetRandomInRange(1, 100), GetRandomInRange(1, 100));
- }
-
- gfx::Rect GetContentDamageRect() {
- // This must be distinct from anything GetRandomDamageRect() could return.
- return gfx::Rect(0, 0, 1280, 720);
- }
-
- // Directly inject an observation. Only used to test
- // ElectMajorityDamageRect().
- void ObserveDamageRect(const gfx::Rect& damage_rect) {
- sampler_->observations_.push_back(
- AnimatedContentSampler::Observation(damage_rect, base::TimeTicks()));
- }
-
- gfx::Rect ElectMajorityDamageRect() const {
- return sampler_->ElectMajorityDamageRect();
- }
-
- private:
- // Note: Not using base::RandInt() because it is horribly slow on debug
- // builds. The following is a very simple, deterministic LCG:
- int NextRandomInt() {
- rand_seed_ = (1103515245 * rand_seed_ + 12345) % (1 << 31);
- return rand_seed_;
- }
-
- int rand_seed_;
- scoped_ptr<AnimatedContentSampler> sampler_;
-};
-
-TEST_F(AnimatedContentSamplerTest, ElectsNoneFromZeroDamageRects) {
- EXPECT_EQ(gfx::Rect(), ElectMajorityDamageRect());
-}
-
-TEST_F(AnimatedContentSamplerTest, ElectsMajorityFromOneDamageRect) {
- const gfx::Rect the_one_rect(0, 0, 1, 1);
- ObserveDamageRect(the_one_rect);
- EXPECT_EQ(the_one_rect, ElectMajorityDamageRect());
-}
-
-TEST_F(AnimatedContentSamplerTest, ElectsNoneFromTwoDamageRectsOfSameArea) {
- const gfx::Rect one_rect(0, 0, 1, 1);
- const gfx::Rect another_rect(1, 1, 1, 1);
- ObserveDamageRect(one_rect);
- ObserveDamageRect(another_rect);
- EXPECT_EQ(gfx::Rect(), ElectMajorityDamageRect());
-}
-
-TEST_F(AnimatedContentSamplerTest, ElectsLargerOfTwoDamageRects_1) {
- const gfx::Rect one_rect(0, 0, 1, 1);
- const gfx::Rect another_rect(0, 0, 2, 2);
- ObserveDamageRect(one_rect);
- ObserveDamageRect(another_rect);
- EXPECT_EQ(another_rect, ElectMajorityDamageRect());
-}
-
-TEST_F(AnimatedContentSamplerTest, ElectsLargerOfTwoDamageRects_2) {
- const gfx::Rect one_rect(0, 0, 2, 2);
- const gfx::Rect another_rect(0, 0, 1, 1);
- ObserveDamageRect(one_rect);
- ObserveDamageRect(another_rect);
- EXPECT_EQ(one_rect, ElectMajorityDamageRect());
-}
-
-TEST_F(AnimatedContentSamplerTest, ElectsSameAsMooreDemonstration) {
- // A more complex sequence (from Moore's web site): Three different Rects with
- // the same area, but occurring a different number of times. C should win the
- // vote.
- const gfx::Rect rect_a(0, 0, 1, 4);
- const gfx::Rect rect_b(1, 1, 4, 1);
- const gfx::Rect rect_c(2, 2, 2, 2);
- for (int i = 0; i < 3; ++i)
- ObserveDamageRect(rect_a);
- for (int i = 0; i < 2; ++i)
- ObserveDamageRect(rect_c);
- for (int i = 0; i < 2; ++i)
- ObserveDamageRect(rect_b);
- for (int i = 0; i < 3; ++i)
- ObserveDamageRect(rect_c);
- ObserveDamageRect(rect_b);
- for (int i = 0; i < 2; ++i)
- ObserveDamageRect(rect_c);
- EXPECT_EQ(rect_c, ElectMajorityDamageRect());
-}
-
-TEST_F(AnimatedContentSamplerTest, Elects24FpsVideoInsteadOf48FpsSpinner) {
- // Scenario: 24 FPS 720x480 Video versus 48 FPS 96x96 "Busy Spinner"
- const gfx::Rect video_rect(100, 100, 720, 480);
- const gfx::Rect spinner_rect(360, 0, 96, 96);
- for (int i = 0; i < 100; ++i) {
- // |video_rect| occurs once for every two |spinner_rect|. Vary the order
- // of events between the two:
- ObserveDamageRect(video_rect);
- ObserveDamageRect(spinner_rect);
- ObserveDamageRect(spinner_rect);
- ObserveDamageRect(video_rect);
- ObserveDamageRect(spinner_rect);
- ObserveDamageRect(spinner_rect);
- ObserveDamageRect(spinner_rect);
- ObserveDamageRect(video_rect);
- ObserveDamageRect(spinner_rect);
- ObserveDamageRect(spinner_rect);
- ObserveDamageRect(video_rect);
- ObserveDamageRect(spinner_rect);
- }
- EXPECT_EQ(video_rect, ElectMajorityDamageRect());
-}
-
-namespace {
-
-// A test scenario for AnimatedContentSamplerParameterizedTest.
-struct Scenario {
- base::TimeDelta vsync_interval; // Reflects compositor's update rate.
- base::TimeDelta min_capture_period; // Reflects maximum capture rate.
- base::TimeDelta content_period; // Reflects content animation rate.
-
- Scenario(base::TimeDelta v, base::TimeDelta m, base::TimeDelta c)
- : vsync_interval(v), min_capture_period(m), content_period(c) {
- CHECK(content_period >= vsync_interval)
- << "Bad test params: Impossible to animate faster than the compositor.";
- }
-};
-
-// Value printer for Scenario.
-::std::ostream& operator<<(::std::ostream& os, const Scenario& s) {
- return os << "{ vsync_interval=" << s.vsync_interval.InMicroseconds()
- << ", min_capture_period=" << s.min_capture_period.InMicroseconds()
- << ", content_period=" << s.content_period.InMicroseconds()
- << " }";
-}
-
-base::TimeDelta FpsAsPeriod(int frame_rate) {
- return base::TimeDelta::FromSeconds(1) / frame_rate;
-}
-
} // namespace
-class AnimatedContentSamplerParameterizedTest
- : public AnimatedContentSamplerTest,
- public ::testing::WithParamInterface<Scenario> {
- public:
- AnimatedContentSamplerParameterizedTest()
- : count_dropped_frames_(0), count_sampled_frames_(0) {}
- virtual ~AnimatedContentSamplerParameterizedTest() {}
-
- protected:
- typedef std::pair<gfx::Rect, base::TimeTicks> Event;
-
- base::TimeDelta GetMinCapturePeriod() const override {
- return GetParam().min_capture_period;
- }
-
- // Generate a sequence of events from the compositor pipeline. The event
- // times will all be at compositor vsync boundaries.
- std::vector<Event> GenerateEventSequence(base::TimeTicks begin,
- base::TimeTicks end,
- bool include_content_frame_events,
- bool include_random_events) {
- DCHECK(GetParam().content_period >= GetParam().vsync_interval);
- base::TimeTicks next_content_time = begin - GetParam().content_period;
- std::vector<Event> events;
- for (base::TimeTicks compositor_time = begin; compositor_time < end;
- compositor_time += GetParam().vsync_interval) {
- if (include_content_frame_events && next_content_time < compositor_time) {
- events.push_back(Event(GetContentDamageRect(), compositor_time));
- next_content_time += GetParam().content_period;
- } else if (include_random_events && GetRandomInRange(0, 1) == 0) {
- events.push_back(Event(GetRandomDamageRect(), compositor_time));
- }
- }
-
- DCHECK(!events.empty());
- return events;
- }
-
- // Feed |events| through the sampler, and detect whether the expected
- // lock-in/out transition occurs. Also, track and measure the frame drop
- // ratio and check it against the expected drop rate.
- void RunEventSequence(const std::vector<Event> events,
- bool was_detecting_before,
- bool is_detecting_after,
- bool simulate_pipeline_back_pressure) {
- gfx::Rect first_detected_region;
-
- EXPECT_EQ(was_detecting_before, sampler()->HasProposal());
- bool has_detection_switched = false;
- ResetFrameCounters();
- for (std::vector<Event>::const_iterator i = events.begin();
- i != events.end(); ++i) {
- sampler()->ConsiderPresentationEvent(i->first, i->second);
-
- // Detect when the sampler locks in/out, and that it stays that way for
- // all further iterations of this loop.
- if (!has_detection_switched &&
- was_detecting_before != sampler()->HasProposal()) {
- has_detection_switched = true;
- }
- ASSERT_EQ(
- has_detection_switched ? is_detecting_after : was_detecting_before,
- sampler()->HasProposal());
-
- if (sampler()->HasProposal()) {
- // Make sure the sampler doesn't flip-flop and keep proposing sampling
- // based on locking into different regions.
- if (first_detected_region.IsEmpty()) {
- first_detected_region = sampler()->detected_region();
- ASSERT_FALSE(first_detected_region.IsEmpty());
- } else {
- EXPECT_EQ(first_detected_region, sampler()->detected_region());
- }
-
- if (simulate_pipeline_back_pressure && GetRandomInRange(0, 2) == 0)
- ClientCannotSampleFrame(*i);
- else
- ClientDoesWhatSamplerProposes(*i);
- } else {
- EXPECT_FALSE(sampler()->ShouldSample());
- if (!simulate_pipeline_back_pressure || GetRandomInRange(0, 2) == 1)
- sampler()->RecordSample(i->second);
- }
- }
- EXPECT_EQ(is_detecting_after, sampler()->HasProposal());
- ExpectFrameDropRatioIsCorrect();
- }
-
- void ResetFrameCounters() {
- count_dropped_frames_ = 0;
- count_sampled_frames_ = 0;
- }
-
- // Keep track what the sampler is proposing, and call RecordSample() if it
- // proposes sampling |event|.
- void ClientDoesWhatSamplerProposes(const Event& event) {
- if (sampler()->ShouldSample()) {
- EXPECT_EQ(GetContentDamageRect(), event.first);
- sampler()->RecordSample(sampler()->frame_timestamp());
- ++count_sampled_frames_;
- } else if (event.first == GetContentDamageRect()) {
- ++count_dropped_frames_;
- }
- }
-
- // RecordSample() is not called, but for testing, keep track of what the
- // sampler is proposing for |event|.
- void ClientCannotSampleFrame(const Event& event) {
- if (sampler()->ShouldSample()) {
- EXPECT_EQ(GetContentDamageRect(), event.first);
- ++count_sampled_frames_;
- } else if (event.first == GetContentDamageRect()) {
- ++count_dropped_frames_;
- }
- }
-
- // Confirm the AnimatedContentSampler is not dropping more frames than
- // expected, given current test parameters.
- void ExpectFrameDropRatioIsCorrect() {
- if (count_sampled_frames_ == 0) {
- EXPECT_EQ(0, count_dropped_frames_);
- return;
- }
- const double content_framerate =
- 1000000.0 / GetParam().content_period.InMicroseconds();
- const double capture_framerate =
- 1000000.0 / GetParam().min_capture_period.InMicroseconds();
- const double expected_drop_rate = std::max(
- 0.0, (content_framerate - capture_framerate) / capture_framerate);
- const double actual_drop_rate =
- static_cast<double>(count_dropped_frames_) / count_sampled_frames_;
- EXPECT_NEAR(expected_drop_rate, actual_drop_rate, 0.015);
- }
-
- private:
- // These counters only include the frames with the desired content.
- int count_dropped_frames_;
- int count_sampled_frames_;
-};
-
-// Tests that the implementation locks in/out of frames containing stable
-// animated content, whether or not random events are also simultaneously
-// present.
-TEST_P(AnimatedContentSamplerParameterizedTest, DetectsAnimatedContent) {
- // |begin| refers to the start of an event sequence in terms of the
- // Compositor's clock.
- base::TimeTicks begin = InitialTestTimeTicks();
-
- // Provide random events and expect no lock-in.
- base::TimeTicks end = begin + base::TimeDelta::FromSeconds(5);
- RunEventSequence(GenerateEventSequence(begin, end, false, true),
- false,
- false,
- false);
- begin = end;
-
- // Provide content frame events with some random events mixed-in, and expect
- // the sampler to lock-in.
- end = begin + base::TimeDelta::FromSeconds(5);
- RunEventSequence(GenerateEventSequence(begin, end, true, true),
- false,
- true,
- false);
- begin = end;
-
- // Continue providing content frame events without the random events mixed-in
- // and expect the lock-in to hold.
- end = begin + base::TimeDelta::FromSeconds(5);
- RunEventSequence(GenerateEventSequence(begin, end, true, false),
- true,
- true,
- false);
- begin = end;
-
- // Continue providing just content frame events and expect the lock-in to
- // hold. Also simulate the capture pipeline experiencing back pressure.
- end = begin + base::TimeDelta::FromSeconds(20);
- RunEventSequence(GenerateEventSequence(begin, end, true, false),
- true,
- true,
- true);
- begin = end;
-
- // Provide a half-second of random events only, and expect the lock-in to be
- // broken.
- end = begin + base::TimeDelta::FromMilliseconds(500);
- RunEventSequence(GenerateEventSequence(begin, end, false, true),
- true,
- false,
- false);
- begin = end;
-
- // Now, go back to providing content frame events, and expect the sampler to
- // lock-in once again.
- end = begin + base::TimeDelta::FromSeconds(5);
- RunEventSequence(GenerateEventSequence(begin, end, true, false),
- false,
- true,
- false);
- begin = end;
-}
-
-// Tests that AnimatedContentSampler won't lock in to, nor flip-flop between,
-// two animations of the same pixel change rate. VideoCaptureOracle should
-// revert to using the SmoothEventSampler for these kinds of situations, as
-// there is no "right answer" as to which animation to lock into.
-TEST_P(AnimatedContentSamplerParameterizedTest,
- DoesNotLockInToTwoCompetingAnimations) {
- // Don't test when the event stream cannot indicate two separate content
- // animations under the current test parameters.
- if (GetParam().content_period < 2 * GetParam().vsync_interval)
- return;
-
- // Start the first animation and run for a bit, and expect the sampler to
- // lock-in.
- base::TimeTicks begin = InitialTestTimeTicks();
- base::TimeTicks end = begin + base::TimeDelta::FromSeconds(5);
- RunEventSequence(GenerateEventSequence(begin, end, true, false),
- false,
- true,
- false);
- begin = end;
-
- // Now, keep the first animation and blend in an second animation of the same
- // size and frame rate, but at a different position. This will should cause
- // the sampler to enter an "undetected" state since it's unclear which
- // animation should be locked into.
- end = begin + base::TimeDelta::FromSeconds(20);
- std::vector<Event> first_animation_events =
- GenerateEventSequence(begin, end, true, false);
- gfx::Rect second_animation_rect(
- gfx::Point(0, GetContentDamageRect().height()),
- GetContentDamageRect().size());
- std::vector<Event> both_animations_events;
- base::TimeDelta second_animation_offset = GetParam().vsync_interval;
- for (std::vector<Event>::const_iterator i = first_animation_events.begin();
- i != first_animation_events.end(); ++i) {
- both_animations_events.push_back(*i);
- both_animations_events.push_back(
- Event(second_animation_rect, i->second + second_animation_offset));
- }
- RunEventSequence(both_animations_events, true, false, false);
- begin = end;
-
- // Now, run just the first animation, and expect the sampler to lock-in once
- // again.
- end = begin + base::TimeDelta::FromSeconds(5);
- RunEventSequence(GenerateEventSequence(begin, end, true, false),
- false,
- true,
- false);
- begin = end;
-
- // Now, blend in the second animation again, but it has half the frame rate of
- // the first animation and damage Rects with twice the area. This will should
- // cause the sampler to enter an "undetected" state again. This tests that
- // pixel-weighting is being accounted for in the sampler's logic.
- end = begin + base::TimeDelta::FromSeconds(20);
- first_animation_events = GenerateEventSequence(begin, end, true, false);
- second_animation_rect.set_width(second_animation_rect.width() * 2);
- both_animations_events.clear();
- bool include_second_animation_frame = true;
- for (std::vector<Event>::const_iterator i = first_animation_events.begin();
- i != first_animation_events.end(); ++i) {
- both_animations_events.push_back(*i);
- if (include_second_animation_frame) {
- both_animations_events.push_back(
- Event(second_animation_rect, i->second + second_animation_offset));
- }
- include_second_animation_frame = !include_second_animation_frame;
- }
- RunEventSequence(both_animations_events, true, false, false);
- begin = end;
-}
-
-// Tests that the frame timestamps are smooth; meaning, that when run through a
-// simulated compositor, each frame is held displayed for the right number of
-// v-sync intervals.
-TEST_P(AnimatedContentSamplerParameterizedTest, FrameTimestampsAreSmooth) {
- // Generate 30 seconds of animated content events, run the events through
- // AnimatedContentSampler, and record all frame timestamps being proposed
- // once lock-in is continuous.
- base::TimeTicks begin = InitialTestTimeTicks();
- std::vector<Event> events = GenerateEventSequence(
- begin,
- begin + base::TimeDelta::FromSeconds(20),
- true,
- false);
- typedef std::vector<base::TimeTicks> Timestamps;
- Timestamps frame_timestamps;
- for (std::vector<Event>::const_iterator i = events.begin(); i != events.end();
- ++i) {
- sampler()->ConsiderPresentationEvent(i->first, i->second);
- if (sampler()->HasProposal()) {
- if (sampler()->ShouldSample()) {
- frame_timestamps.push_back(sampler()->frame_timestamp());
- sampler()->RecordSample(sampler()->frame_timestamp());
- }
- } else {
- frame_timestamps.clear(); // Reset until continuous lock-in.
- }
- }
- ASSERT_LE(2u, frame_timestamps.size());
-
- // Iterate through the |frame_timestamps|, building a histogram counting the
- // number of times each frame was displayed k times. For example, 10 frames
- // of 30 Hz content on a 60 Hz v-sync interval should result in
- // display_counts[2] == 10. Quit early if any one frame was obviously
- // repeated too many times.
- const int64 max_expected_repeats_per_frame = 1 +
- std::max(GetParam().min_capture_period, GetParam().content_period) /
- GetParam().vsync_interval;
- std::vector<size_t> display_counts(max_expected_repeats_per_frame + 1, 0);
- base::TimeTicks last_present_time = frame_timestamps.front();
- for (Timestamps::const_iterator i = frame_timestamps.begin() + 1;
- i != frame_timestamps.end(); ++i) {
- const size_t num_vsync_intervals = static_cast<size_t>(
- (*i - last_present_time) / GetParam().vsync_interval);
- ASSERT_LT(0u, num_vsync_intervals);
- ASSERT_GT(display_counts.size(), num_vsync_intervals); // Quit early.
- ++display_counts[num_vsync_intervals];
- last_present_time += num_vsync_intervals * GetParam().vsync_interval;
- }
-
- // Analyze the histogram for an expected result pattern. If the frame
- // timestamps are smooth, there should only be one or two buckets with
- // non-zero counts and they should be next to each other. Because the clock
- // precision for the event_times provided to the sampler is very granular
- // (i.e., the vsync_interval), it's okay if other buckets have a tiny "stray"
- // count in this test.
- size_t highest_count = 0;
- size_t second_highest_count = 0;
- for (size_t repeats = 1; repeats < display_counts.size(); ++repeats) {
- DVLOG(1) << "display_counts[" << repeats << "] is "
- << display_counts[repeats];
- if (display_counts[repeats] >= highest_count) {
- second_highest_count = highest_count;
- highest_count = display_counts[repeats];
- } else if (display_counts[repeats] > second_highest_count) {
- second_highest_count = display_counts[repeats];
- }
- }
- size_t stray_count_remaining =
- (frame_timestamps.size() - 1) - (highest_count + second_highest_count);
- // Expect no more than 0.75% of frames fall outside the two main buckets.
- EXPECT_GT(frame_timestamps.size() * 75 / 10000, stray_count_remaining);
- for (size_t repeats = 1; repeats < display_counts.size() - 1; ++repeats) {
- if (display_counts[repeats] == highest_count) {
- EXPECT_EQ(second_highest_count, display_counts[repeats + 1]);
- ++repeats;
- } else if (display_counts[repeats] == second_highest_count) {
- EXPECT_EQ(highest_count, display_counts[repeats + 1]);
- ++repeats;
- } else {
- EXPECT_GE(stray_count_remaining, display_counts[repeats]);
- stray_count_remaining -= display_counts[repeats];
- }
- }
-}
-
-// Tests that frame timestamps are "lightly pushed" back towards the original
-// presentation event times, which tells us the AnimatedContentSampler can
-// account for sources of timestamp drift and correct the drift.
-TEST_P(AnimatedContentSamplerParameterizedTest,
- FrameTimestampsConvergeTowardsEventTimes) {
- const int max_drift_increment_millis = 3;
-
- // Generate a full minute of events.
- const base::TimeTicks begin = InitialTestTimeTicks();
- const base::TimeTicks end = begin + base::TimeDelta::FromMinutes(1);
- std::vector<Event> events = GenerateEventSequence(begin, end, true, false);
-
- // Modify the event sequence so that 1-3 ms of additional drift is suddenly
- // present every 100 events. This is meant to simulate that, external to
- // AnimatedContentSampler, the video hardware vsync timebase is being
- // refreshed and is showing severe drift from the system clock.
- base::TimeDelta accumulated_drift;
- for (size_t i = 1; i < events.size(); ++i) {
- if (i % 100 == 0) {
- accumulated_drift += base::TimeDelta::FromMilliseconds(
- GetRandomInRange(1, max_drift_increment_millis + 1));
- }
- events[i].second += accumulated_drift;
- }
-
- // Run all the events through the sampler and track the last rewritten frame
- // timestamp.
- base::TimeTicks last_frame_timestamp;
- for (std::vector<Event>::const_iterator i = events.begin(); i != events.end();
- ++i) {
- sampler()->ConsiderPresentationEvent(i->first, i->second);
- if (sampler()->ShouldSample())
- last_frame_timestamp = sampler()->frame_timestamp();
- }
-
- // If drift was accounted for, the |last_frame_timestamp| should be close to
- // the last event's timestamp.
- const base::TimeDelta total_error =
- events.back().second - last_frame_timestamp;
- const base::TimeDelta max_acceptable_error = GetParam().min_capture_period +
- base::TimeDelta::FromMilliseconds(max_drift_increment_millis);
- EXPECT_NEAR(0.0,
- total_error.InMicroseconds(),
- max_acceptable_error.InMicroseconds());
-}
-
-INSTANTIATE_TEST_CASE_P(
- ,
- AnimatedContentSamplerParameterizedTest,
- ::testing::Values(
- // Typical frame rate content: Compositor runs at 60 Hz, capture at 30
- // Hz, and content video animates at 30, 25, or 24 Hz.
- Scenario(FpsAsPeriod(60), FpsAsPeriod(30), FpsAsPeriod(30)),
- Scenario(FpsAsPeriod(60), FpsAsPeriod(30), FpsAsPeriod(25)),
- Scenario(FpsAsPeriod(60), FpsAsPeriod(30), FpsAsPeriod(24)),
-
- // High frame rate content that leverages the Compositor's
- // capabilities, but capture is still at 30 Hz.
- Scenario(FpsAsPeriod(60), FpsAsPeriod(30), FpsAsPeriod(60)),
- Scenario(FpsAsPeriod(60), FpsAsPeriod(30), FpsAsPeriod(50)),
- Scenario(FpsAsPeriod(60), FpsAsPeriod(30), FpsAsPeriod(48)),
-
- // High frame rate content that leverages the Compositor's
- // capabilities, and capture is also a buttery 60 Hz.
- Scenario(FpsAsPeriod(60), FpsAsPeriod(60), FpsAsPeriod(60)),
- Scenario(FpsAsPeriod(60), FpsAsPeriod(60), FpsAsPeriod(50)),
- Scenario(FpsAsPeriod(60), FpsAsPeriod(60), FpsAsPeriod(48)),
-
- // On some platforms, the Compositor runs at 50 Hz.
- Scenario(FpsAsPeriod(50), FpsAsPeriod(30), FpsAsPeriod(30)),
- Scenario(FpsAsPeriod(50), FpsAsPeriod(30), FpsAsPeriod(25)),
- Scenario(FpsAsPeriod(50), FpsAsPeriod(30), FpsAsPeriod(24)),
- Scenario(FpsAsPeriod(50), FpsAsPeriod(30), FpsAsPeriod(50)),
- Scenario(FpsAsPeriod(50), FpsAsPeriod(30), FpsAsPeriod(48)),
-
- // Stable, but non-standard content frame rates.
- Scenario(FpsAsPeriod(60), FpsAsPeriod(30), FpsAsPeriod(16)),
- Scenario(FpsAsPeriod(60), FpsAsPeriod(30), FpsAsPeriod(20)),
- Scenario(FpsAsPeriod(60), FpsAsPeriod(30), FpsAsPeriod(23)),
- Scenario(FpsAsPeriod(60), FpsAsPeriod(30), FpsAsPeriod(26)),
- Scenario(FpsAsPeriod(60), FpsAsPeriod(30), FpsAsPeriod(27)),
- Scenario(FpsAsPeriod(60), FpsAsPeriod(30), FpsAsPeriod(28)),
- Scenario(FpsAsPeriod(60), FpsAsPeriod(30), FpsAsPeriod(29)),
- Scenario(FpsAsPeriod(60), FpsAsPeriod(30), FpsAsPeriod(31)),
- Scenario(FpsAsPeriod(60), FpsAsPeriod(30), FpsAsPeriod(32)),
- Scenario(FpsAsPeriod(60), FpsAsPeriod(30), FpsAsPeriod(33))));
-
// Tests that VideoCaptureOracle filters out events whose timestamps are
// decreasing.
TEST(VideoCaptureOracleTest, EnforcesEventTimeMonotonicity) {
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