chaos/NTP-Timeturner
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increase curses refresh rate

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Chris Frankland-Wright 2025-06-24 23:00:35 +01:00
parent 632c5be35e
commit 4e181f7fe3
1 changed files with 20 additions and 16 deletions
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36
timeturner.py
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@ -4,9 +4,9 @@ import curses
import subprocess
import shutil
import time
import select
def start_ltc_stream():
# Launch ffmpeg piped into ltcdump
ffmpeg = subprocess.Popen(
["ffmpeg", "-f", "alsa", "-i", "default", "-ac", "1", "-ar", "48000", "-f", "s16le", "-"],
stdout=subprocess.PIPE,
@ -17,39 +17,43 @@ def start_ltc_stream():
stdin=ffmpeg.stdout,
stdout=subprocess.PIPE,
stderr=subprocess.DEVNULL,
text=True
text=True,
bufsize=1 # Line-buffered
)
ffmpeg.stdout.close() # Let ltcdump consume the pipe
ffmpeg.stdout.close()
return ffmpeg, ltcdump
def main(stdscr):
curses.curs_set(0)
stdscr.nodelay(True)
stdscr.addstr(1, 2, "🌀 NTP Timeturner Status")
stdscr.addstr(3, 4, "Streaming LTC from default input...")
ffmpeg_proc, ltcdump_proc = start_ltc_stream()
latest_tc = "⌛ Waiting for LTC..."
last_refresh = time.time()
last_update = time.time()
try:
while True:
stdscr.clear()
# Check for new output from ltcdump (non-blocking)
rlist, _, _ = select.select([ltcdump_proc.stdout], [], [], 0)
if rlist:
line = ltcdump_proc.stdout.readline().strip()
if line and line[0].isdigit():
latest_tc = line
last_update = time.time()
# Detect stale or missing LTC
if time.time() - last_update > 1:
latest_tc = "⚠️ No LTC signal"
# UI
stdscr.erase()
stdscr.addstr(1, 2, "🌀 NTP Timeturner Status")
stdscr.addstr(3, 4, "Streaming LTC from default input...")
stdscr.addstr(5, 6, f"🕰️ LTC Timecode: {latest_tc}")
stdscr.refresh()
# Check if new LTC line available
if ltcdump_proc.stdout.readable():
line = ltcdump_proc.stdout.readline().strip()
if line and line[0].isdigit():
latest_tc = line
# Limit screen redraw to ~10fps
time.sleep(0.1)
time.sleep(0.04) # ~25 FPS
except KeyboardInterrupt:
stdscr.addstr(8, 6, "🔚 Shutting down...")