chaos/NTP-Timeturner
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refactor: Use rational numbers for accurate frame rate calculations

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Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>
This commit is contained in:
Chris Frankland-Wright 2025-08-02 12:26:17 +01:00
parent b71e13d4c4
commit a1da396874
6 changed files with 41 additions and 17 deletions
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18
timeturner.py
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@ -9,10 +9,11 @@ import threading
import queue
import json
from collections import deque
from fractions import Fraction
SERIAL_PORT = None
BAUD_RATE = 115200
FRAME_RATE = 25.0
FRAME_RATE = Fraction(25, 1)
CONFIG_PATH = "config.json"
sync_pending = False
@ -30,6 +31,14 @@ sync_enabled = False
last_match_check = 0
timecode_match_status = "UNKNOWN"
def framerate_str_to_fraction(s):
if s == "23.98": return Fraction(24000, 1001)
if s == "24.00": return Fraction(24, 1)
if s == "25.00": return Fraction(25, 1)
if s == "29.97": return Fraction(30000, 1001)
if s == "30.00": return Fraction(30, 1)
return None
def load_config():
global hardware_offset_ms
try:
@ -50,13 +59,16 @@ def parse_ltc_line(line):
if not match:
return None
status, hh, mm, ss, ff, fps = match.groups()
rate = framerate_str_to_fraction(fps)
if not rate:
return None
return {
"status": status,
"hours": int(hh),
"minutes": int(mm),
"seconds": int(ss),
"frames": int(ff),
"frame_rate": float(fps)
"frame_rate": rate
}
def serial_thread(port, baud, q):
@ -154,7 +166,7 @@ def run_curses(stdscr):
parsed, arrival_time = latest_ltc
stdscr.addstr(3, 2, f"LTC Status : {parsed['status']}")
stdscr.addstr(4, 2, f"LTC Timecode : {parsed['hours']:02}:{parsed['minutes']:02}:{parsed['seconds']:02}:{parsed['frames']:02}")
stdscr.addstr(5, 2, f"Frame Rate : {FRAME_RATE:.2f}fps")
stdscr.addstr(5, 2, f"Frame Rate : {float(FRAME_RATE):.2f}fps")
stdscr.addstr(6, 2, f"System Clock : {format_time(get_system_time())}")
if ltc_locked and sync_enabled and offset_history: