chaos/NTP-Timeturner
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fix: correct timecode drift at non-25fps frame rates

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Co-authored-by: aider (deepseek/deepseek-reasoner) <aider@aider.chat>
This commit is contained in:
Chaos Rogers 2025-07-31 16:26:35 +01:00
parent ee3bbbe29f
commit 60d57f74d8
2 changed files with 12 additions and 11 deletions
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1
src/sync_logic.rs
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@ -32,6 +32,7 @@ impl LtcFrame {
/// Compare just HH:MM:SS against local time.
pub fn matches_system_time(&self) -> bool {
let local = Local::now();
// We only compare hours, minutes and seconds - frames are not considered in this comparison
local.hour() == self.hours
&& local.minute() == self.minutes
&& local.second() == self.seconds

22
static/script.js
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@ -101,22 +101,22 @@ document.addEventListener('DOMContentLoaded', () => {
let s = parseInt(tcParts[2], 10);
let f = parseInt(tcParts[3], 10);
const frameRateInt = Math.round(frameRate);
const msPerFrame = 1000.0 / frameRate;
const elapsedFrames = Math.floor(elapsedMs / msPerFrame);
f += elapsedFrames;
// Compute total seconds including fractional part
let totalSeconds = h * 3600 + m * 60 + s + f / frameRateInt;
totalSeconds += elapsedMs / 1000.0;
const frameRateInt = Math.round(frameRate);
s += Math.floor(f / frameRateInt);
f %= frameRateInt;
m += Math.floor(s / 60);
s %= 60;
h += Math.floor(m / 60);
m %= 60;
// Convert back to components
let newSeconds = Math.floor(totalSeconds);
f = Math.round((totalSeconds - newSeconds) * frameRateInt) % frameRateInt;
h = Math.floor(newSeconds / 3600);
newSeconds %= 3600;
m = Math.floor(newSeconds / 60);
s = Math.floor(newSeconds % 60);
h %= 24;
statusElements.ltcTimecode.textContent =