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| 1 <!DOCTYPE html> | 1 <!DOCTYPE html> |
| 2 <!-- | 2 <!-- |
| 3 Copyright 2017 The Chromium Authors. All rights reserved. | 3 Copyright 2017 The Chromium Authors. All rights reserved. |
| 4 Use of this source code is governed by a BSD-style license that can be | 4 Use of this source code is governed by a BSD-style license that can be |
| 5 found in the LICENSE file. | 5 found in the LICENSE file. |
| 6 --> | 6 --> |
| 7 | 7 |
| 8 <link rel="import" href="/tracing/base/range.html"> | 8 <link rel="import" href="/tracing/base/math/range.html"> |
| 9 <link rel="import" href="/tracing/base/unit.html"> | 9 <link rel="import" href="/tracing/base/unit.html"> |
| 10 <link rel="import" href="/tracing/base/utils.html"> | 10 <link rel="import" href="/tracing/base/utils.html"> |
| 11 <link rel="import" href="/tracing/metrics/metric_registry.html"> | 11 <link rel="import" href="/tracing/metrics/metric_registry.html"> |
| 12 <link rel="import" href="/tracing/metrics/v8/utils.html"> | 12 <link rel="import" href="/tracing/metrics/v8/utils.html"> |
| 13 <link rel="import" href="/tracing/value/histogram.html"> | 13 <link rel="import" href="/tracing/value/histogram.html"> |
| 14 | 14 |
| 15 <script> | 15 <script> |
| 16 'use strict'; | 16 'use strict'; |
| 17 | 17 |
| 18 tr.exportTo('tr.metrics.webrtc', function() { | 18 tr.exportTo('tr.metrics.webrtc', function() { |
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| 259 let actualRenderBegin = event.args[ACTUAL_RENDER_BEGIN_NAME]; | 259 let actualRenderBegin = event.args[ACTUAL_RENDER_BEGIN_NAME]; |
| 260 // When was the frame rendered vs. when it would've been ideal. | 260 // When was the frame rendered vs. when it would've been ideal. |
| 261 driftTime.push(actualRenderBegin - currentIdealRender); | 261 driftTime.push(actualRenderBegin - currentIdealRender); |
| 262 // The discrepancy is the absolute difference between the current Ideal | 262 // The discrepancy is the absolute difference between the current Ideal |
| 263 // Render and the expected Ideal Render. | 263 // Render and the expected Ideal Render. |
| 264 discrepancy.push(Math.abs(currentIdealRender - expectedIdealRender)); | 264 discrepancy.push(Math.abs(currentIdealRender - expectedIdealRender)); |
| 265 expectedIdealRender = currentIdealRender; | 265 expectedIdealRender = currentIdealRender; |
| 266 oldIdealRender = currentIdealRender; | 266 oldIdealRender = currentIdealRender; |
| 267 } | 267 } |
| 268 | 268 |
| 269 let discrepancySum = tr.b.Statistics.sum(discrepancy) - discrepancy[0]; | 269 let discrepancySum = tr.b.math.Statistics.sum(discrepancy) - discrepancy[0]; |
| 270 let lastIdealRender = | 270 let lastIdealRender = |
| 271 events[events.length - 1].args[IDEAL_RENDER_INSTANT_NAME]; | 271 events[events.length - 1].args[IDEAL_RENDER_INSTANT_NAME]; |
| 272 let firstIdealRender = events[0].args[IDEAL_RENDER_INSTANT_NAME]; | 272 let firstIdealRender = events[0].args[IDEAL_RENDER_INSTANT_NAME]; |
| 273 let idealRenderSpan = lastIdealRender - firstIdealRender; | 273 let idealRenderSpan = lastIdealRender - firstIdealRender; |
| 274 | 274 |
| 275 let renderingLengthError = discrepancySum / idealRenderSpan; | 275 let renderingLengthError = discrepancySum / idealRenderSpan; |
| 276 | 276 |
| 277 return {driftTime, renderingLengthError}; | 277 return {driftTime, renderingLengthError}; |
| 278 } | 278 } |
| 279 | 279 |
| 280 /** | 280 /** |
| 281 * Get the smoothness stats from the normalized drift time. | 281 * Get the smoothness stats from the normalized drift time. |
| 282 * | 282 * |
| 283 * This method will calculate the smoothness score, along with the percentage | 283 * This method will calculate the smoothness score, along with the percentage |
| 284 * of frames badly out of sync and the percentage of frames out of sync. | 284 * of frames badly out of sync and the percentage of frames out of sync. |
| 285 * To be considered badly out of sync, a frame has to have missed rendering by | 285 * To be considered badly out of sync, a frame has to have missed rendering by |
| 286 * at least 2 * VSYNC_DURATION_US. | 286 * at least 2 * VSYNC_DURATION_US. |
| 287 * To be considered out of sync, a frame has to have missed rendering by at | 287 * To be considered out of sync, a frame has to have missed rendering by at |
| 288 * least one VSYNC_DURATION_US. | 288 * least one VSYNC_DURATION_US. |
| 289 * The smoothness score is a measure of how out of sync the frames are. | 289 * The smoothness score is a measure of how out of sync the frames are. |
| 290 * | 290 * |
| 291 * @param {Array.<Number>} driftTimes - See getDriftStats. | 291 * @param {Array.<Number>} driftTimes - See getDriftStats. |
| 292 * @returns {Object.<Number, Number, Number>} - The percentBadlyOutOfSync, | 292 * @returns {Object.<Number, Number, Number>} - The percentBadlyOutOfSync, |
| 293 * percentOutOfSync and smoothnesScore calculated from the driftTimes array. | 293 * percentOutOfSync and smoothnesScore calculated from the driftTimes array. |
| 294 */ | 294 */ |
| 295 function getSmoothnessStats(driftTimes) { | 295 function getSmoothnessStats(driftTimes) { |
| 296 let meanDriftTime = tr.b.Statistics.mean(driftTimes); | 296 let meanDriftTime = tr.b.math.Statistics.mean(driftTimes); |
| 297 let normDriftTimes = driftTimes.map(driftTime => | 297 let normDriftTimes = driftTimes.map(driftTime => |
| 298 Math.abs(driftTime - meanDriftTime)); | 298 Math.abs(driftTime - meanDriftTime)); |
| 299 | 299 |
| 300 // How many times is a frame later/earlier than T=2*VSYNC_DURATION_US. Time | 300 // How many times is a frame later/earlier than T=2*VSYNC_DURATION_US. Time |
| 301 // is in microseconds | 301 // is in microseconds |
| 302 let framesSeverelyOutOfSync = normDriftTimes | 302 let framesSeverelyOutOfSync = normDriftTimes |
| 303 .filter(driftTime => driftTime > 2 * VSYNC_DURATION_US) | 303 .filter(driftTime => driftTime > 2 * VSYNC_DURATION_US) |
| 304 .length; | 304 .length; |
| 305 // How many times is a frame later/earlier than VSYNC_DURATION_US. | 305 // How many times is a frame later/earlier than VSYNC_DURATION_US. |
| 306 let framesOutOfSync = normDriftTimes | 306 let framesOutOfSync = normDriftTimes |
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| 330 percentOutOfSync, | 330 percentOutOfSync, |
| 331 smoothnessScore | 331 smoothnessScore |
| 332 }; | 332 }; |
| 333 } | 333 } |
| 334 | 334 |
| 335 return { | 335 return { |
| 336 webrtcRenderingMetric, | 336 webrtcRenderingMetric, |
| 337 }; | 337 }; |
| 338 }); | 338 }); |
| 339 </script> | 339 </script> |
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Chromium Code Reviews
Issue 2771723003:
[tracing] Move math utilities from base into their own subdirectory (attempt 2) (Closed)
