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Fix Morse decoder not receiving PCM audio from rtl_fm

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Add bufsize=0 to Popen for raw FileIO instead of BufferedReader, and
start decoder/stderr threads immediately before sleep+poll so stdout
is read without delay — matching the working pager pattern.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Smittix
2026-02-26 10:21:14 +00:00
parent 9622a00ea1
commit 5d90c308a9
1 changed files with 23 additions and 20 deletions
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43
routes/morse.py
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@@ -136,28 +136,11 @@ def start_morse() -> Response:
rtl_cmd,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
bufsize=0,
)
register_process(rtl_process)
# Detect immediate startup failure (e.g. device busy, no device)
time.sleep(0.35)
if rtl_process.poll() is not None:
stderr_text = ''
try:
if rtl_process.stderr:
stderr_text = rtl_process.stderr.read().decode(
'utf-8', errors='replace'
).strip()
except Exception:
stderr_text = ''
msg = stderr_text or f'rtl_fm exited immediately (code {rtl_process.returncode})'
logger.error(f"Morse rtl_fm startup failed: {msg}")
unregister_process(rtl_process)
if morse_active_device is not None:
app_module.release_sdr_device(morse_active_device)
morse_active_device = None
return jsonify({'status': 'error', 'message': msg}), 500
# Start threads IMMEDIATELY so stdout is read before pipe fills.
# Forward rtl_fm stderr to queue so frontend can display diagnostics
def monitor_stderr():
for line in rtl_process.stderr:
@@ -174,7 +157,7 @@ def start_morse() -> Response:
stderr_thread.daemon = True
stderr_thread.start()
# Start Morse decoder thread
# Start Morse decoder thread before sleep so it reads stdout immediately
stop_event = threading.Event()
decoder_thread = threading.Thread(
target=morse_decoder_thread,
@@ -190,6 +173,26 @@ def start_morse() -> Response:
decoder_thread.daemon = True
decoder_thread.start()
# Detect immediate startup failure (e.g. device busy, no device)
time.sleep(0.35)
if rtl_process.poll() is not None:
stop_event.set()
stderr_text = ''
try:
if rtl_process.stderr:
stderr_text = rtl_process.stderr.read().decode(
'utf-8', errors='replace'
).strip()
except Exception:
stderr_text = ''
msg = stderr_text or f'rtl_fm exited immediately (code {rtl_process.returncode})'
logger.error(f"Morse rtl_fm startup failed: {msg}")
unregister_process(rtl_process)
if morse_active_device is not None:
app_module.release_sdr_device(morse_active_device)
morse_active_device = None
return jsonify({'status': 'error', 'message': msg}), 500
app_module.morse_process = rtl_process
app_module.morse_process._stop_decoder = stop_event
app_module.morse_process._decoder_thread = decoder_thread