150 lines
5.0 KiB
Python
150 lines
5.0 KiB
Python
import threading
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import wave
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from datetime import datetime, timedelta, date
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import time
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import sched
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import subprocess
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import os
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from multiprocessing.connection import Pipe
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from owrx.map import Map, LocatorLocation
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import re
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import logging
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logger = logging.getLogger(__name__)
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class Ft8Chopper(threading.Thread):
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def __init__(self, source):
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self.source = source
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(self.wavefilename, self.wavefile) = self.getWaveFile()
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self.switchingLock = threading.Lock()
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self.scheduler = sched.scheduler(time.time, time.sleep)
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self.fileQueue = []
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(self.outputReader, self.outputWriter) = Pipe()
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self.doRun = True
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super().__init__()
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def getWaveFile(self):
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filename = "/tmp/openwebrx-ft8chopper-{0}.wav".format(datetime.now().strftime("%Y%m%d-%H%M%S"))
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wavefile = wave.open(filename, "wb")
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wavefile.setnchannels(1)
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wavefile.setsampwidth(2)
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wavefile.setframerate(12000)
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return (filename, wavefile)
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def getNextDecodingTime(self):
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t = datetime.now()
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seconds = (int(t.second / 15) + 1) * 15
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if seconds >= 60:
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t = t + timedelta(minutes = 1)
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seconds = 0
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t = t.replace(second = seconds, microsecond = 0)
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logger.debug("scheduling: {0}".format(t))
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return t.timestamp()
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def startScheduler(self):
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self._scheduleNextSwitch()
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threading.Thread(target = self.scheduler.run).start()
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def emptyScheduler(self):
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for event in self.scheduler.queue:
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self.scheduler.cancel(event)
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def _scheduleNextSwitch(self):
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self.scheduler.enterabs(self.getNextDecodingTime(), 1, self.switchFiles)
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def switchFiles(self):
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self.switchingLock.acquire()
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file = self.wavefile
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filename = self.wavefilename
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(self.wavefilename, self.wavefile) = self.getWaveFile()
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self.switchingLock.release()
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file.close()
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self.fileQueue.append(filename)
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self._scheduleNextSwitch()
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def decode(self):
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def decode_and_unlink(file):
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#TODO expose decoding quality parameters through config
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decoder = subprocess.Popen(["jt9", "--ft8", "-d", "3", file], stdout=subprocess.PIPE)
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while True:
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line = decoder.stdout.readline()
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if line is None or (isinstance(line, bytes) and len(line) == 0):
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break
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self.outputWriter.send(line)
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rc = decoder.wait()
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logger.debug("decoder return code: %i", rc)
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os.unlink(file)
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self.decoder = decoder
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if self.fileQueue:
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file = self.fileQueue.pop()
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logger.debug("processing file {0}".format(file))
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threading.Thread(target=decode_and_unlink, args=[file]).start()
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def run(self) -> None:
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logger.debug("FT8 chopper starting up")
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self.startScheduler()
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while self.doRun:
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data = self.source.read(256)
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if data is None or (isinstance(data, bytes) and len(data) == 0):
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logger.warning("zero read on ft8 chopper")
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self.doRun = False
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else:
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self.switchingLock.acquire()
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self.wavefile.writeframes(data)
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self.switchingLock.release()
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self.decode()
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logger.debug("FT8 chopper shutting down")
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self.outputReader.close()
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self.outputWriter.close()
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self.emptyScheduler()
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def read(self):
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try:
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return self.outputReader.recv()
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except EOFError:
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return None
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class WsjtParser(object):
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def __init__(self, handler):
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self.handler = handler
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self.locator_pattern = re.compile(".*\s([A-Z0-9]+)\s([A-R]{2}[0-9]{2})$")
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def parse(self, data):
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try:
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msg = data.decode().rstrip()
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# known debug messages we know to skip
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if msg.startswith("<DecodeFinished>"):
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return
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if msg.startswith(" EOF on input file"):
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return
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out = {}
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ts = datetime.strptime(msg[0:6], "%H%M%S")
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out["timestamp"] = int(datetime.combine(date.today(), ts.time(), datetime.now().tzinfo).timestamp() * 1000)
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out["db"] = float(msg[7:10])
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out["dt"] = float(msg[11:15])
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out["freq"] = int(msg[16:20])
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wsjt_msg = msg[24:60].strip()
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self.getLocator(wsjt_msg)
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out["msg"] = wsjt_msg
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self.handler.write_wsjt_message(out)
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except ValueError:
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logger.exception("error while parsing wsjt message")
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def getLocator(self, msg):
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m = self.locator_pattern.match(msg)
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if m is None:
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return
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# this is a valid locator in theory, but it's somewhere in the arctic ocean, near the north pole, so it's very
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# likely this just means roger roger goodbye.
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if m.group(2) == "RR73":
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return
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Map.getSharedInstance().updateLocation(m.group(1), LocatorLocation(m.group(2)))
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