joshpatra/videospeed
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general performance updates

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This commit is contained in:
Josh Patra
2025-11-25 10:44:52 -05:00
parent 5009e83f62
commit ef86a70ca5
2 changed files with 135 additions and 93 deletions
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120
inject.js
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@@ -24,8 +24,8 @@ var tc = {
`.replace(regStrip, ""),
defaultLogLevel: 4,
logLevel: 5, // Set to 5 to see your debug logs
enableSubtitleNudge: true,
subtitleNudgeInterval: 25,
enableSubtitleNudge: true, // Enabled by default, but only activates on YouTube
subtitleNudgeInterval: 100, // Reduced from 25ms to 100ms (10x/sec instead of 40x/sec)
subtitleNudgeAmount: 0.001
},
mediaElements: [],
@@ -123,7 +123,7 @@ chrome.storage.sync.get(tc.settings, function (storage) {
? Boolean(storage.enableSubtitleNudge)
: tc.settings.enableSubtitleNudge;
tc.settings.subtitleNudgeInterval =
Number(storage.subtitleNudgeInterval) || 25;
Number(storage.subtitleNudgeInterval) || 100; // Default 100ms for better performance
tc.settings.subtitleNudgeAmount =
Number(storage.subtitleNudgeAmount) || tc.settings.subtitleNudgeAmount;
if (
@@ -378,6 +378,9 @@ function defineVideoController() {
return;
}
// Store the target speed so we can always revert to it
this.targetSpeed = this.video.playbackRate;
const performNudge = () => {
// Check if we should stop
if (!this.video || this.video.paused || this.video.playbackRate === 1.0) {
@@ -385,20 +388,31 @@ function defineVideoController() {
return;
}
const currentRate = this.video.playbackRate;
// CRITICAL: Don't nudge if tab is hidden - prevents speed drift
if (document.hidden) {
this.nudgeAnimationId = setTimeout(performNudge, tc.settings.subtitleNudgeInterval);
return;
}
// Set flag to prevent ratechange listener from interfering
tc.isNudging = true;
// Cache values to avoid repeated property access
const targetSpeed = this.targetSpeed;
const nudgeAmount = tc.settings.subtitleNudgeAmount;
// Apply nudge
this.video.playbackRate = currentRate + nudgeAmount;
// Apply nudge from the stored target speed (not current rate)
this.video.playbackRate = targetSpeed + nudgeAmount;
// Revert on next frame
requestAnimationFrame(() => {
if (this.video) {
this.video.playbackRate = currentRate;
// Revert synchronously after a microtask to ensure it happens immediately
Promise.resolve().then(() => {
if (this.video && targetSpeed) {
this.video.playbackRate = targetSpeed;
}
tc.isNudging = false;
});
// Schedule next nudge using setTimeout instead of continuous RAF loop
// Schedule next nudge
this.nudgeAnimationId = setTimeout(performNudge, tc.settings.subtitleNudgeInterval);
};
@@ -413,6 +427,8 @@ function defineVideoController() {
this.nudgeAnimationId = null;
log(`Nudge: Stopping.`, 5);
}
// Clear the target speed when stopping
this.targetSpeed = null;
};
tc.videoController.prototype.performImmediateNudge = function () {
@@ -427,25 +443,27 @@ function defineVideoController() {
!tc.settings.enableSubtitleNudge ||
!this.video ||
this.video.paused ||
this.video.playbackRate === 1.0
this.video.playbackRate === 1.0 ||
document.hidden
) {
return;
}
const currentRate = this.video.playbackRate;
const targetRate = this.targetSpeed || this.video.playbackRate;
const nudgeAmount = tc.settings.subtitleNudgeAmount;
// Apply nudge
this.video.playbackRate = currentRate + nudgeAmount;
tc.isNudging = true;
this.video.playbackRate = targetRate + nudgeAmount;
// Revert on next frame
requestAnimationFrame(() => {
// Revert synchronously via microtask
Promise.resolve().then(() => {
if (this.video) {
this.video.playbackRate = currentRate;
this.video.playbackRate = targetRate;
}
tc.isNudging = false;
});
log(`Immediate nudge performed at rate ${currentRate.toFixed(2)}`, 5);
log(`Immediate nudge performed at rate ${targetRate.toFixed(2)}`, 5);
};
tc.videoController.prototype.initializeControls = function () {
@@ -734,10 +752,21 @@ function initializeNow(doc, forceReinit = false) {
});
if (!doc.vscMutationObserverAttached) {
// Throttle mutation processing to reduce CPU usage
let mutationProcessingScheduled = false;
let pendingMutations = [];
const observer = new MutationObserver(function (mutations) {
pendingMutations.push(...mutations);
if (!mutationProcessingScheduled) {
mutationProcessingScheduled = true;
requestIdleCallback(
(_) => {
mutations.forEach(function (mutation) {
const mutationsToProcess = pendingMutations.splice(0);
mutationProcessingScheduled = false;
mutationsToProcess.forEach(function (mutation) {
switch (mutation.type) {
case "childList":
mutation.addedNodes.forEach(function (node) {
@@ -765,6 +794,7 @@ function initializeNow(doc, forceReinit = false) {
target.attributes["aria-hidden"] &&
target.attributes["aria-hidden"].value == "false"
) {
// Only scan shadow DOM if absolutely necessary (expensive operation)
var flattenedNodes = getShadow(document.body);
var node = flattenedNodes.filter(
(x) => x.tagName == "VIDEO"
@@ -784,6 +814,7 @@ function initializeNow(doc, forceReinit = false) {
},
{ timeout: 1000 }
);
}
});
function checkForVideo(node, parent, added) {
if (!added && document.body.contains(node)) return;
@@ -825,7 +856,7 @@ function initializeNow(doc, forceReinit = false) {
}
}
observer.observe(doc, {
attributeFilter: ["aria-hidden", "src", "currentSrc", "style", "class"],
attributeFilter: ["aria-hidden", "src", "currentSrc"], // Removed "style" and "class" for better performance
childList: true,
subtree: true,
attributes: true
@@ -955,11 +986,17 @@ function initializeNow(doc, forceReinit = false) {
// Listen for hashchange as well
window.addEventListener('hashchange', () => handleNavigation('hashchange'));
// Also intercept fetch and XMLHttpRequest for AJAX-heavy sites
// Throttle fetch-based video scanning to reduce CPU usage
let lastFetchScanTime = 0;
const FETCH_SCAN_THROTTLE = 2000; // Only scan once every 2 seconds max
const originalFetch = window.fetch;
window.fetch = function (...args) {
return originalFetch.apply(this, args).then(response => {
// After any fetch completes, check for new videos
// Throttle video scanning after fetch to avoid excessive CPU usage
const now = Date.now();
if (now - lastFetchScanTime > FETCH_SCAN_THROTTLE) {
lastFetchScanTime = now;
setTimeout(() => {
const q = tc.settings.audioBoolean ? "video,audio" : "video";
const videos = document.querySelectorAll(q);
@@ -970,6 +1007,7 @@ function initializeNow(doc, forceReinit = false) {
}
});
}, 200);
}
return response;
});
};
@@ -982,27 +1020,27 @@ function initializeNow(doc, forceReinit = false) {
const periodicScan = () => {
const q = tc.settings.audioBoolean ? "video,audio" : "video";
const allVideos = doc.querySelectorAll(q);
let foundNew = false;
let foundNewCount = 0;
allVideos.forEach(video => {
if (!video.vsc && (video.src || video.currentSrc || video.readyState > 0)) {
log(`Periodic scan found missed ${video.tagName.toLowerCase()}`, 4);
checkForVideo(video, video.parentElement, true);
foundNew = true;
foundNewCount++;
}
});
if (foundNew) {
log(`Periodic scan found ${foundNew} new videos`, 4);
if (foundNewCount > 0) {
log(`Periodic scan found ${foundNewCount} new videos`, 4);
}
};
// Run periodic scan every 3 seconds, but only if we have videos on the page
// Run periodic scan every 5 seconds (reduced frequency), only if we have videos
setInterval(() => {
if (tc.mediaElements.length > 0 || doc.querySelector(tc.settings.audioBoolean ? "video,audio" : "video")) {
periodicScan();
}
}, 3000);
}, 5000); // Increased from 3s to 5s for better performance
doc.vscPeriodicScanAttached = true;
}
@@ -1022,6 +1060,9 @@ function setSpeed(video, speed, isInitialCall = false, isUserKeyPress = false) {
tc.settings.lastSpeed = numericSpeed;
video.vsc.speedIndicator.textContent = numericSpeed.toFixed(2);
// Update the target speed for nudge so it knows what to revert to
video.vsc.targetSpeed = numericSpeed;
if (isUserKeyPress && !isInitialCall && video.vsc && video.vsc.div) {
runAction("blink", 1000, null, video); // Pass video to blink
}
@@ -1108,18 +1149,19 @@ function runAction(action, value, e) {
v.currentTime += numValue;
break;
case "faster":
setSpeed(
v,
Math.min(
(v.playbackRate < 0.07 ? 0.07 : v.playbackRate) + numValue,
16
),
false,
true
);
// Round to the step precision to avoid floating-point issues (e.g., 1.80 + 0.1 = 1.9000000000000001)
var fasterStep = numValue;
var fasterPrecision = Math.round(1 / fasterStep); // e.g., 0.1 -> 10, 0.05 -> 20, 0.25 -> 4
var newFasterSpeed = (v.playbackRate < 0.07 ? 0.07 : v.playbackRate) + fasterStep;
newFasterSpeed = Math.round(newFasterSpeed * fasterPrecision) / fasterPrecision;
setSpeed(v, Math.min(newFasterSpeed, 16), false, true);
break;
case "slower":
setSpeed(v, Math.max(v.playbackRate - numValue, 0.07), false, true);
var slowerStep = numValue;
var slowerPrecision = Math.round(1 / slowerStep);
var newSlowerSpeed = v.playbackRate - slowerStep;
newSlowerSpeed = Math.round(newSlowerSpeed * slowerPrecision) / slowerPrecision;
setSpeed(v, Math.max(newSlowerSpeed, 0.07), false, true);
break;
case "reset":
resetSpeed(v, 1.0, false); // Use enhanced resetSpeed

2
manifest.json
View File

@@ -1,7 +1,7 @@
{
"name": "Video Speed Controller",
"short_name": "videospeed",
"version": "2.0.1",
"version": "2.1.0",
"manifest_version": 2,
"description": "Speed up, slow down, advance and rewind HTML5 audio/video with shortcuts",
"homepage_url": "https://github.com/SoPat712/videospeed",