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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "content/browser/media/capture/video_capture_oracle.h" | |
| 6 | |
| 7 #include "base/strings/stringprintf.h" | |
| 8 #include "testing/gtest/include/gtest/gtest.h" | |
| 9 | |
| 10 namespace content { | |
| 11 | |
| 12 namespace { | |
| 13 | |
| 14 base::TimeTicks InitialTestTimeTicks() { | |
| 15 return base::TimeTicks() + base::TimeDelta::FromSeconds(1); | |
| 16 } | |
| 17 | |
| 18 } // namespace | |
| 19 | |
| 20 // Tests that VideoCaptureOracle filters out events whose timestamps are | |
| 21 // decreasing. | |
| 22 TEST(VideoCaptureOracleTest, EnforcesEventTimeMonotonicity) { | |
| 23 const base::TimeDelta min_capture_period = | |
| 24 base::TimeDelta::FromSeconds(1) / 30; | |
| 25 const gfx::Rect damage_rect(0, 0, 1280, 720); | |
| 26 const base::TimeDelta event_increment = min_capture_period * 2; | |
| 27 | |
| 28 VideoCaptureOracle oracle(min_capture_period); | |
| 29 | |
| 30 base::TimeTicks t = InitialTestTimeTicks(); | |
| 31 for (int i = 0; i < 10; ++i) { | |
| 32 t += event_increment; | |
| 33 ASSERT_TRUE(oracle.ObserveEventAndDecideCapture( | |
| 34 VideoCaptureOracle::kCompositorUpdate, | |
| 35 damage_rect, t)); | |
| 36 } | |
| 37 | |
| 38 base::TimeTicks furthest_event_time = t; | |
| 39 for (int i = 0; i < 10; ++i) { | |
| 40 t -= event_increment; | |
| 41 ASSERT_FALSE(oracle.ObserveEventAndDecideCapture( | |
| 42 VideoCaptureOracle::kCompositorUpdate, | |
| 43 damage_rect, t)); | |
| 44 } | |
| 45 | |
| 46 t = furthest_event_time; | |
| 47 for (int i = 0; i < 10; ++i) { | |
| 48 t += event_increment; | |
| 49 ASSERT_TRUE(oracle.ObserveEventAndDecideCapture( | |
| 50 VideoCaptureOracle::kCompositorUpdate, | |
| 51 damage_rect, t)); | |
| 52 } | |
| 53 } | |
| 54 | |
| 55 // Tests that VideoCaptureOracle is enforcing the requirement that captured | |
| 56 // frames are delivered in order. Otherwise, downstream consumers could be | |
| 57 // tripped-up by out-of-order frames or frame timestamps. | |
| 58 TEST(VideoCaptureOracleTest, EnforcesFramesDeliveredInOrder) { | |
| 59 const base::TimeDelta min_capture_period = | |
| 60 base::TimeDelta::FromSeconds(1) / 30; | |
| 61 const gfx::Rect damage_rect(0, 0, 1280, 720); | |
| 62 const base::TimeDelta event_increment = min_capture_period * 2; | |
| 63 | |
| 64 VideoCaptureOracle oracle(min_capture_period); | |
| 65 | |
| 66 // Most basic scenario: Frames delivered one at a time, with no additional | |
| 67 // captures in-between deliveries. | |
| 68 base::TimeTicks t = InitialTestTimeTicks(); | |
| 69 int last_frame_number; | |
| 70 base::TimeTicks ignored; | |
| 71 for (int i = 0; i < 10; ++i) { | |
| 72 t += event_increment; | |
| 73 ASSERT_TRUE(oracle.ObserveEventAndDecideCapture( | |
| 74 VideoCaptureOracle::kCompositorUpdate, | |
| 75 damage_rect, t)); | |
| 76 last_frame_number = oracle.RecordCapture(); | |
| 77 ASSERT_TRUE(oracle.CompleteCapture(last_frame_number, true, &ignored)); | |
| 78 } | |
| 79 | |
| 80 // Basic pipelined scenario: More than one frame in-flight at delivery points. | |
| 81 for (int i = 0; i < 50; ++i) { | |
| 82 const int num_in_flight = 1 + i % 3; | |
| 83 for (int j = 0; j < num_in_flight; ++j) { | |
| 84 t += event_increment; | |
| 85 ASSERT_TRUE(oracle.ObserveEventAndDecideCapture( | |
| 86 VideoCaptureOracle::kCompositorUpdate, | |
| 87 damage_rect, t)); | |
| 88 last_frame_number = oracle.RecordCapture(); | |
| 89 } | |
| 90 for (int j = num_in_flight - 1; j >= 0; --j) { | |
| 91 ASSERT_TRUE( | |
| 92 oracle.CompleteCapture(last_frame_number - j, true, &ignored)); | |
| 93 } | |
| 94 } | |
| 95 | |
| 96 // Pipelined scenario with out-of-order delivery attempts rejected. | |
| 97 for (int i = 0; i < 50; ++i) { | |
| 98 const int num_in_flight = 1 + i % 3; | |
| 99 for (int j = 0; j < num_in_flight; ++j) { | |
| 100 t += event_increment; | |
| 101 ASSERT_TRUE(oracle.ObserveEventAndDecideCapture( | |
| 102 VideoCaptureOracle::kCompositorUpdate, | |
| 103 damage_rect, t)); | |
| 104 last_frame_number = oracle.RecordCapture(); | |
| 105 } | |
| 106 ASSERT_TRUE(oracle.CompleteCapture(last_frame_number, true, &ignored)); | |
| 107 for (int j = 1; j < num_in_flight; ++j) { | |
| 108 ASSERT_FALSE( | |
| 109 oracle.CompleteCapture(last_frame_number - j, true, &ignored)); | |
| 110 } | |
| 111 } | |
| 112 } | |
| 113 | |
| 114 // Tests that VideoCaptureOracle transitions between using its two samplers in a | |
| 115 // way that does not introduce severe jank, pauses, etc. | |
| 116 TEST(VideoCaptureOracleTest, TransitionsSmoothlyBetweenSamplers) { | |
| 117 const base::TimeDelta min_capture_period = | |
| 118 base::TimeDelta::FromSeconds(1) / 30; | |
| 119 const gfx::Rect animation_damage_rect(0, 0, 1280, 720); | |
| 120 const base::TimeDelta event_increment = min_capture_period * 2; | |
| 121 | |
| 122 VideoCaptureOracle oracle(min_capture_period); | |
| 123 | |
| 124 // Run sequences of animation events and non-animation events through the | |
| 125 // oracle. As the oracle transitions between each sampler, make sure the | |
| 126 // frame timestamps won't trip-up downstream consumers. | |
| 127 base::TimeTicks t = InitialTestTimeTicks(); | |
| 128 base::TimeTicks last_frame_timestamp; | |
| 129 for (int i = 0; i < 1000; ++i) { | |
| 130 t += event_increment; | |
| 131 | |
| 132 // For every 100 events, provide 50 that will cause the | |
| 133 // AnimatedContentSampler to lock-in, followed by 50 that will cause it to | |
| 134 // lock-out (i.e., the oracle will use the SmoothEventSampler instead). | |
| 135 const bool provide_animated_content_event = | |
| 136 (i % 100) >= 25 && (i % 100) < 75; | |
| 137 | |
| 138 // Only the few events that trigger the lock-out transition should be | |
| 139 // dropped, because the AnimatedContentSampler doesn't yet realize the | |
| 140 // animation ended. Otherwise, the oracle should always decide to sample | |
| 141 // because one of its samplers says to. | |
| 142 const bool require_oracle_says_sample = (i % 100) < 75 || (i % 100) >= 78; | |
| 143 const bool oracle_says_sample = oracle.ObserveEventAndDecideCapture( | |
| 144 VideoCaptureOracle::kCompositorUpdate, | |
| 145 provide_animated_content_event ? animation_damage_rect : gfx::Rect(), | |
| 146 t); | |
| 147 if (require_oracle_says_sample) | |
| 148 ASSERT_TRUE(oracle_says_sample); | |
| 149 if (!oracle_says_sample) { | |
| 150 ASSERT_EQ(base::TimeDelta(), oracle.estimated_frame_duration()); | |
| 151 continue; | |
| 152 } | |
| 153 ASSERT_LT(base::TimeDelta(), oracle.estimated_frame_duration()); | |
| 154 | |
| 155 const int frame_number = oracle.RecordCapture(); | |
| 156 | |
| 157 base::TimeTicks frame_timestamp; | |
| 158 ASSERT_TRUE(oracle.CompleteCapture(frame_number, true, &frame_timestamp)); | |
| 159 ASSERT_FALSE(frame_timestamp.is_null()); | |
| 160 if (!last_frame_timestamp.is_null()) { | |
| 161 const base::TimeDelta delta = frame_timestamp - last_frame_timestamp; | |
| 162 EXPECT_LE(event_increment.InMicroseconds(), delta.InMicroseconds()); | |
| 163 // Right after the AnimatedContentSampler lock-out transition, there were | |
| 164 // a few frames dropped, so allow a gap in the timestamps. Otherwise, the | |
| 165 // delta between frame timestamps should never be more than 2X the | |
| 166 // |event_increment|. | |
| 167 const base::TimeDelta max_acceptable_delta = (i % 100) == 78 ? | |
| 168 event_increment * 5 : event_increment * 2; | |
| 169 EXPECT_GE(max_acceptable_delta.InMicroseconds(), delta.InMicroseconds()); | |
| 170 } | |
| 171 last_frame_timestamp = frame_timestamp; | |
| 172 } | |
| 173 } | |
| 174 | |
| 175 // Tests that VideoCaptureOracle prevents timer polling from initiating | |
| 176 // simultaneous captures. | |
| 177 TEST(VideoCaptureOracleTest, SamplesOnlyOneOverdueFrameAtATime) { | |
| 178 const base::TimeDelta min_capture_period = | |
| 179 base::TimeDelta::FromSeconds(1) / 30; | |
| 180 const base::TimeDelta vsync_interval = | |
| 181 base::TimeDelta::FromSeconds(1) / 60; | |
| 182 const base::TimeDelta timer_interval = base::TimeDelta::FromMilliseconds( | |
| 183 VideoCaptureOracle::kMinTimerPollPeriodMillis); | |
| 184 | |
| 185 VideoCaptureOracle oracle(min_capture_period); | |
| 186 | |
| 187 // Have the oracle observe some compositor events. Simulate that each capture | |
| 188 // completes successfully. | |
| 189 base::TimeTicks t = InitialTestTimeTicks(); | |
| 190 base::TimeTicks ignored; | |
| 191 bool did_complete_a_capture = false; | |
| 192 for (int i = 0; i < 10; ++i) { | |
| 193 t += vsync_interval; | |
| 194 if (oracle.ObserveEventAndDecideCapture( | |
| 195 VideoCaptureOracle::kCompositorUpdate, gfx::Rect(), t)) { | |
| 196 ASSERT_TRUE( | |
| 197 oracle.CompleteCapture(oracle.RecordCapture(), true, &ignored)); | |
| 198 did_complete_a_capture = true; | |
| 199 } | |
| 200 } | |
| 201 ASSERT_TRUE(did_complete_a_capture); | |
| 202 | |
| 203 // Start one more compositor-based capture, but do not notify of completion | |
| 204 // yet. | |
| 205 for (int i = 0; i <= 10; ++i) { | |
| 206 ASSERT_GT(10, i) << "BUG: Seems like it'll never happen!"; | |
| 207 t += vsync_interval; | |
| 208 if (oracle.ObserveEventAndDecideCapture( | |
| 209 VideoCaptureOracle::kCompositorUpdate, gfx::Rect(), t)) { | |
| 210 break; | |
| 211 } | |
| 212 } | |
| 213 int frame_number = oracle.RecordCapture(); | |
| 214 | |
| 215 // Stop providing the compositor events and start providing timer polling | |
| 216 // events. No overdue samplings should be recommended because of the | |
| 217 // not-yet-complete compositor-based capture. | |
| 218 for (int i = 0; i < 10; ++i) { | |
| 219 t += timer_interval; | |
| 220 ASSERT_FALSE(oracle.ObserveEventAndDecideCapture( | |
| 221 VideoCaptureOracle::kTimerPoll, gfx::Rect(), t)); | |
| 222 } | |
| 223 | |
| 224 // Now, complete the oustanding compositor-based capture and continue | |
| 225 // providing timer polling events. The oracle should start recommending | |
| 226 // sampling again. | |
| 227 ASSERT_TRUE(oracle.CompleteCapture(frame_number, true, &ignored)); | |
| 228 did_complete_a_capture = false; | |
| 229 for (int i = 0; i < 10; ++i) { | |
| 230 t += timer_interval; | |
| 231 if (oracle.ObserveEventAndDecideCapture( | |
| 232 VideoCaptureOracle::kTimerPoll, gfx::Rect(), t)) { | |
| 233 ASSERT_TRUE( | |
| 234 oracle.CompleteCapture(oracle.RecordCapture(), true, &ignored)); | |
| 235 did_complete_a_capture = true; | |
| 236 } | |
| 237 } | |
| 238 ASSERT_TRUE(did_complete_a_capture); | |
| 239 | |
| 240 // Start one more timer-based capture, but do not notify of completion yet. | |
| 241 for (int i = 0; i <= 10; ++i) { | |
| 242 ASSERT_GT(10, i) << "BUG: Seems like it'll never happen!"; | |
| 243 t += timer_interval; | |
| 244 if (oracle.ObserveEventAndDecideCapture( | |
| 245 VideoCaptureOracle::kTimerPoll, gfx::Rect(), t)) { | |
| 246 break; | |
| 247 } | |
| 248 } | |
| 249 frame_number = oracle.RecordCapture(); | |
| 250 | |
| 251 // Confirm that the oracle does not recommend sampling until the outstanding | |
| 252 // timer-based capture completes. | |
| 253 for (int i = 0; i < 10; ++i) { | |
| 254 t += timer_interval; | |
| 255 ASSERT_FALSE(oracle.ObserveEventAndDecideCapture( | |
| 256 VideoCaptureOracle::kTimerPoll, gfx::Rect(), t)); | |
| 257 } | |
| 258 ASSERT_TRUE(oracle.CompleteCapture(frame_number, true, &ignored)); | |
| 259 for (int i = 0; i <= 10; ++i) { | |
| 260 ASSERT_GT(10, i) << "BUG: Seems like it'll never happen!"; | |
| 261 t += timer_interval; | |
| 262 if (oracle.ObserveEventAndDecideCapture( | |
| 263 VideoCaptureOracle::kTimerPoll, gfx::Rect(), t)) { | |
| 264 break; | |
| 265 } | |
| 266 } | |
| 267 } | |
| 268 | |
| 269 } // namespace content | |
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Chromium Code Reviews
Issue 1162863003:
Move ContentVideoCaptureDeviceCore from src/content to src/media (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master