openwebrx-clone/owrx/wsjt.py

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import threading
import wave
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from datetime import datetime, timedelta, date, timezone
import time
import sched
import subprocess
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import os
from multiprocessing.connection import Pipe
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from owrx.map import Map, LocatorLocation
import re
from owrx.config import PropertyManager
from owrx.bands import Bandplan
import logging
logger = logging.getLogger(__name__)
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class WsjtChopper(threading.Thread):
def __init__(self, source):
self.source = source
self.tmp_dir = PropertyManager.getSharedInstance()["temporary_directory"]
(self.wavefilename, self.wavefile) = self.getWaveFile()
self.switchingLock = threading.Lock()
self.scheduler = sched.scheduler(time.time, time.sleep)
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self.fileQueue = []
(self.outputReader, self.outputWriter) = Pipe()
self.doRun = True
super().__init__()
def getWaveFile(self):
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filename = "{tmp_dir}/openwebrx-wsjtchopper-{id}-{timestamp}.wav".format(
tmp_dir=self.tmp_dir, id=id(self), timestamp=datetime.utcnow().strftime(self.fileTimestampFormat)
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)
wavefile = wave.open(filename, "wb")
wavefile.setnchannels(1)
wavefile.setsampwidth(2)
wavefile.setframerate(12000)
return (filename, wavefile)
def getNextDecodingTime(self):
t = datetime.now()
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zeroed = t.replace(minute=0, second=0, microsecond=0)
delta = t - zeroed
seconds = (int(delta.total_seconds() / self.interval) + 1) * self.interval
t = zeroed + timedelta(seconds=seconds)
logger.debug("scheduling: {0}".format(t))
return t.timestamp()
def startScheduler(self):
self._scheduleNextSwitch()
threading.Thread(target=self.scheduler.run).start()
def emptyScheduler(self):
for event in self.scheduler.queue:
self.scheduler.cancel(event)
def _scheduleNextSwitch(self):
self.scheduler.enterabs(self.getNextDecodingTime(), 1, self.switchFiles)
def switchFiles(self):
self.switchingLock.acquire()
file = self.wavefile
filename = self.wavefilename
(self.wavefilename, self.wavefile) = self.getWaveFile()
self.switchingLock.release()
file.close()
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self.fileQueue.append(filename)
self._scheduleNextSwitch()
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def decoder_commandline(self, file):
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"""
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must be overridden in child classes
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"""
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return []
def decode(self):
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def decode_and_unlink(file):
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decoder = subprocess.Popen(self.decoder_commandline(file), stdout=subprocess.PIPE, cwd=self.tmp_dir)
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while True:
line = decoder.stdout.readline()
if line is None or (isinstance(line, bytes) and len(line) == 0):
break
self.outputWriter.send(line)
rc = decoder.wait()
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if rc != 0:
logger.warning("decoder return code: %i", rc)
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os.unlink(file)
if self.fileQueue:
file = self.fileQueue.pop()
logger.debug("processing file {0}".format(file))
threading.Thread(target=decode_and_unlink, args=[file]).start()
def run(self) -> None:
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logger.debug("WSJT chopper starting up")
self.startScheduler()
while self.doRun:
data = self.source.read(256)
if data is None or (isinstance(data, bytes) and len(data) == 0):
self.doRun = False
else:
self.switchingLock.acquire()
self.wavefile.writeframes(data)
self.switchingLock.release()
self.decode()
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logger.debug("WSJT chopper shutting down")
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self.outputReader.close()
self.outputWriter.close()
self.emptyScheduler()
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try:
os.unlink(self.wavefilename)
except Exception:
logger.exception("error removing undecoded file")
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def read(self):
try:
return self.outputReader.recv()
except EOFError:
return None
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class Ft8Chopper(WsjtChopper):
def __init__(self, source):
self.interval = 15
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self.fileTimestampFormat = "%y%m%d_%H%M%S"
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super().__init__(source)
def decoder_commandline(self, file):
# TODO expose decoding quality parameters through config
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return ["jt9", "--ft8", "-d", "3", file]
class WsprChopper(WsjtChopper):
def __init__(self, source):
self.interval = 120
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self.fileTimestampFormat = "%y%m%d_%H%M"
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super().__init__(source)
def decoder_commandline(self, file):
# TODO expose decoding quality parameters through config
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return ["wsprd", "-d", file]
class Jt65Chopper(WsjtChopper):
def __init__(self, source):
self.interval = 60
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self.fileTimestampFormat = "%y%m%d_%H%M"
super().__init__(source)
def decoder_commandline(self, file):
# TODO expose decoding quality parameters through config
return ["jt9", "--jt65", "-d", "3", file]
class Jt9Chopper(WsjtChopper):
def __init__(self, source):
self.interval = 60
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self.fileTimestampFormat = "%y%m%d_%H%M"
super().__init__(source)
def decoder_commandline(self, file):
# TODO expose decoding quality parameters through config
return ["jt9", "--jt9", "-d", "3", file]
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class Ft4Chopper(WsjtChopper):
def __init__(self, source):
self.interval = 7.5
self.fileTimestampFormat = "%y%m%d_%H%M%S"
super().__init__(source)
def decoder_commandline(self, file):
# TODO expose decoding quality parameters through config
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return ["jt9", "--ft4", "-d", "3", file]
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class WsjtParser(object):
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locator_pattern = re.compile(".*\\s([A-Z0-9]+)\\s([A-R]{2}[0-9]{2})$")
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wspr_splitter_pattern = re.compile("([A-Z0-9]*)\\s([A-R]{2}[0-9]{2})\\s([0-9]+)")
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def __init__(self, handler):
self.handler = handler
self.dial_freq = None
self.band = None
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modes = {"~": "FT8", "#": "JT65", "@": "JT9", "+": "FT4"}
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def parse(self, data):
try:
msg = data.decode().rstrip()
# known debug messages we know to skip
if msg.startswith("<DecodeFinished>"):
return
if msg.startswith(" EOF on input file"):
return
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modes = list(WsjtParser.modes.keys())
if msg[21] in modes or msg[19] in modes:
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out = self.parse_from_jt9(msg)
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else:
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out = self.parse_from_wsprd(msg)
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self.handler.write_wsjt_message(out)
except ValueError:
logger.exception("error while parsing wsjt message")
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def parse_timestamp(self, instring, dateformat):
ts = datetime.strptime(instring, dateformat)
return int(datetime.combine(date.today(), ts.time()).replace(tzinfo=timezone.utc).timestamp() * 1000)
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def parse_from_jt9(self, msg):
# ft8 sample
# '222100 -15 -0.0 508 ~ CQ EA7MJ IM66'
# jt65 sample
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# '2352 -7 0.4 1801 # R0WAS R2ABM KO85'
# '0003 -4 0.4 1762 # CQ R2ABM KO85'
modes = list(WsjtParser.modes.keys())
if msg[19] in modes:
dateformat = "%H%M"
else:
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dateformat = "%H%M%S"
timestamp = self.parse_timestamp(msg[0 : len(dateformat)], dateformat)
msg = msg[len(dateformat) + 1 :]
modeChar = msg[14:15]
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mode = WsjtParser.modes[modeChar] if modeChar in WsjtParser.modes else "unknown"
wsjt_msg = msg[17:53].strip()
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self.parseLocator(wsjt_msg, mode)
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return {
"timestamp": timestamp,
"db": float(msg[0:3]),
"dt": float(msg[4:8]),
"freq": int(msg[9:13]),
"mode": mode,
"msg": wsjt_msg,
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}
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def parseLocator(self, msg, mode):
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m = WsjtParser.locator_pattern.match(msg)
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if m is None:
return
# this is a valid locator in theory, but it's somewhere in the arctic ocean, near the north pole, so it's very
# likely this just means roger roger goodbye.
if m.group(2) == "RR73":
return
Map.getSharedInstance().updateLocation(m.group(1), LocatorLocation(m.group(2)), mode, self.band)
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def parse_from_wsprd(self, msg):
# wspr sample
# '2600 -24 0.4 0.001492 -1 G8AXA JO01 33'
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# '0052 -29 2.6 0.001486 0 G02CWT IO92 23'
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wsjt_msg = msg[29:].strip()
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self.parseWsprMessage(wsjt_msg)
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return {
"timestamp": self.parse_timestamp(msg[0:4], "%H%M"),
"db": float(msg[5:8]),
"dt": float(msg[9:13]),
"freq": float(msg[14:24]),
"drift": int(msg[25:28]),
"mode": "WSPR",
"msg": wsjt_msg,
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}
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def parseWsprMessage(self, msg):
m = WsjtParser.wspr_splitter_pattern.match(msg)
if m is None:
return
Map.getSharedInstance().updateLocation(m.group(1), LocatorLocation(m.group(2)), "WSPR", self.band)
def setDialFrequency(self, freq):
self.dial_freq = freq
self.band = Bandplan.getSharedInstance().findBand(freq)