openwebrx-clone/csdr/module/m17.py
2021-12-21 21:18:17 +01:00

59 lines
1.5 KiB
Python

from csdr.module import PopenModule
from pycsdr.types import Format
from pycsdr.modules import Writer
from subprocess import Popen, PIPE
from threading import Thread
import re
import pickle
class M17Module(PopenModule):
lsfRegex = re.compile("SRC: ([a-zA-Z0-9]+), DEST: ([a-zA-Z0-9]+)")
def __init__(self):
super().__init__()
self.metawriter = None
def getInputFormat(self) -> Format:
return Format.SHORT
def getOutputFormat(self) -> Format:
return Format.SHORT
def getCommand(self):
return ["m17-demod", "-l"]
def _getProcess(self):
return Popen(self.getCommand(), stdin=PIPE, stdout=PIPE, stderr=PIPE)
def start(self):
super().start()
Thread(target=self._readOutput).start()
def _readOutput(self):
while True:
line = self.process.stderr.readline()
if not line:
break
self.parseOutput(line.decode())
def parseOutput(self, line):
if self.metawriter is None:
return
matches = self.lsfRegex.match(line)
msg = {"protocol": "M17"}
if matches:
# fake sync
msg["sync"] = "voice"
msg["source"] = matches.group(1)
msg["destination"] = matches.group(2)
elif line.startswith("EOS"):
pass
else:
return
self.metawriter.write(pickle.dumps(msg))
def setMetaWriter(self, writer: Writer) -> None:
self.metawriter = writer