360 lines
11 KiB
Python
360 lines
11 KiB
Python
import threading
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import socket
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from datetime import datetime, timezone, timedelta
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from owrx.source import SdrService
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from owrx.bands import Bandplan
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from csdr import dsp, output
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from owrx.wsjt import WsjtParser
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from owrx.aprs import AprsParser
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from owrx.config import PropertyManager
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from owrx.source import Resampler
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import logging
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logger = logging.getLogger(__name__)
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class ServiceOutput(output):
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def __init__(self, frequency):
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self.frequency = frequency
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def getParser(self):
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# abstract method; implement in subclasses
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pass
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def receive_output(self, t, read_fn):
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parser = self.getParser()
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parser.setDialFrequency(self.frequency)
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target = self.pump(read_fn, parser.parse)
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threading.Thread(target=target).start()
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class WsjtServiceOutput(ServiceOutput):
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def getParser(self):
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return WsjtParser(WsjtHandler())
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def supports_type(self, t):
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return t == "wsjt_demod"
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class AprsServiceOutput(ServiceOutput):
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def getParser(self):
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return AprsParser(AprsHandler())
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def supports_type(self, t):
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return t == "packet_demod"
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class ScheduleEntry(object):
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def __init__(self, startTime, endTime, profile):
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self.startTime = startTime
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self.endTime = endTime
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self.profile = profile
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def isCurrent(self, time):
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if self.startTime < self.endTime:
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return self.startTime <= time < self.endTime
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else:
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return self.startTime <= time or time < self.endTime
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def getProfile(self):
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return self.profile
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def getScheduledEnd(self):
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now = datetime.utcnow()
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end = now.combine(date=now.date(), time=self.endTime)
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while end < now:
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end += timedelta(days=1)
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return end
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def getNextActivation(self):
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now = datetime.utcnow()
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start = now.combine(date=now.date(), time=self.startTime)
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while start < now:
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start += timedelta(days=1)
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return start
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class Schedule(object):
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@staticmethod
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def parse(scheduleDict):
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entries = []
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for time, profile in scheduleDict.items():
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if len(time) != 9:
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logger.warning("invalid schedule spec: %s", time)
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continue
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startTime = datetime.strptime(time[0:4], "%H%M").replace(tzinfo=timezone.utc).time()
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endTime = datetime.strptime(time[5:9], "%H%M").replace(tzinfo=timezone.utc).time()
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entries.append(ScheduleEntry(startTime, endTime, profile))
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return Schedule(entries)
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def __init__(self, entries):
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self.entries = entries
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def getCurrentEntry(self):
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current = [p for p in self.entries if p.isCurrent(datetime.utcnow().time())]
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if current:
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return current[0]
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return None
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def getNextEntry(self):
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s = sorted(self.entries, key=lambda e: e.getNextActivation())
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if s:
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return s[0]
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return None
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class ServiceScheduler(object):
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def __init__(self, source, schedule):
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self.source = source
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self.schedule = Schedule.parse(schedule)
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self.active = False
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self.source.addClient(self)
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self.selectionTimer = None
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self.scheduleSelection()
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def scheduleSelection(self, time=None):
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seconds = 10
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if time is not None:
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delta = time - datetime.utcnow()
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seconds = delta.total_seconds()
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self.cancelTimer()
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self.selectionTimer = threading.Timer(seconds, self.selectProfile)
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self.selectionTimer.start()
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def cancelTimer(self):
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if self.selectionTimer:
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self.selectionTimer.cancel()
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def isActive(self):
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return self.active
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def onSdrAvailable(self):
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pass
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def onSdrUnavailable(self):
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self.scheduleSelection()
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def onSdrFailed(self):
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self.cancelTimer()
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def selectProfile(self):
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self.active = False
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if self.source.hasActiveClients():
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logger.debug("source has active clients; not touching")
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return
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logger.debug("source seems to be idle, selecting profile for background services")
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entry = self.schedule.getCurrentEntry()
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if entry is None:
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logger.debug("schedule did not return a profile. checking next entry...")
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nextEntry = self.schedule.getNextEntry()
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if nextEntry is not None:
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self.scheduleSelection(nextEntry.getNextActivation())
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return
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logger.debug("scheduling end for current profile: %s", entry.getScheduledEnd())
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self.scheduleSelection(entry.getScheduledEnd())
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try:
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self.active = True
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self.source.activateProfile(entry.getProfile())
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self.source.start()
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except KeyError:
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pass
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class ServiceHandler(object):
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def __init__(self, source):
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self.lock = threading.Lock()
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self.services = []
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self.source = source
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self.startupTimer = None
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self.source.addClient(self)
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props = self.source.getProps()
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props.collect("center_freq", "samp_rate").wire(self.onFrequencyChange)
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if self.source.isAvailable():
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self.scheduleServiceStartup()
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if "schedule" in props:
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ServiceScheduler(self.source, props["schedule"])
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def isActive(self):
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return False
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def onSdrAvailable(self):
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self.scheduleServiceStartup()
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def onSdrUnavailable(self):
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logger.debug("sdr source becoming unavailable; stopping services.")
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self.stopServices()
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def onSdrFailed(self):
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logger.debug("sdr source failed; stopping services.")
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self.stopServices()
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def isSupported(self, mode):
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return mode in PropertyManager.getSharedInstance()["services_decoders"]
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def stopServices(self):
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with self.lock:
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services = self.services
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self.services = []
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for service in services:
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service.stop()
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def onFrequencyChange(self, key, value):
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self.stopServices()
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if not self.source.isAvailable():
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return
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self.scheduleServiceStartup()
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def scheduleServiceStartup(self):
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if self.startupTimer:
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self.startupTimer.cancel()
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self.startupTimer = threading.Timer(10, self.updateServices)
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self.startupTimer.start()
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def getAvailablePort(self):
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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s.bind(("", 0))
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s.listen(1)
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port = s.getsockname()[1]
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s.close()
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return port
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def updateServices(self):
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logger.debug("re-scheduling services due to sdr changes")
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self.stopServices()
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if not self.source.isAvailable():
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logger.debug("sdr source is unavailable")
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return
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cf = self.source.getProps()["center_freq"]
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sr = self.source.getProps()["samp_rate"]
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srh = sr / 2
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frequency_range = (cf - srh, cf + srh)
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dials = [
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dial
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for dial in Bandplan.getSharedInstance().collectDialFrequencies(frequency_range)
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if self.isSupported(dial["mode"])
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]
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if not dials:
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logger.debug("no services available")
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return
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with self.lock:
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self.services = []
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for group in self.optimizeResampling(dials, sr):
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frequencies = sorted([f["frequency"] for f in group])
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min = frequencies[0]
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max = frequencies[-1]
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cf = (min + max) / 2
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bw = max - min
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logger.debug("group center frequency: {0}, bandwidth: {1}".format(cf, bw))
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resampler_props = PropertyManager()
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resampler_props["center_freq"] = cf
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# TODO the + 24000 is a temporary fix since the resampling optimizer does not account for required bandwidths
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resampler_props["samp_rate"] = bw + 24000
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resampler = Resampler(resampler_props, self.getAvailablePort(), self.source)
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resampler.start()
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self.services.append(resampler)
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for dial in group:
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self.services.append(self.setupService(dial["mode"], dial["frequency"], resampler))
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def optimizeResampling(self, freqs, bandwidth):
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freqs = sorted(freqs, key=lambda f: f["frequency"])
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distances = [
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{"frequency": freqs[i]["frequency"], "distance": freqs[i + 1]["frequency"] - freqs[i]["frequency"]}
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for i in range(0, len(freqs) - 1)
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]
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distances = [d for d in distances if d["distance"] > 0]
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distances = sorted(distances, key=lambda f: f["distance"], reverse=True)
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def calculate_usage(num_splits):
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splits = sorted([f["frequency"] for f in distances[0:num_splits]])
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previous = 0
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groups = []
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for split in splits:
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groups.append([f for f in freqs if previous < f["frequency"] <= split])
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previous = split
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groups.append([f for f in freqs if previous < f["frequency"]])
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def get_bandwitdh(group):
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freqs = sorted([f["frequency"] for f in group])
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# the group will process the full BW once, plus the reduced BW once for each group member
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return bandwidth + len(group) * (freqs[-1] - freqs[0] + 24000)
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total_bandwidth = sum([get_bandwitdh(group) for group in groups])
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return {"num_splits": num_splits, "total_bandwidth": total_bandwidth, "groups": groups}
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usages = [calculate_usage(i) for i in range(0, len(freqs))]
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# this is simulating no resampling. i haven't seen this as the best result yet
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usages += [{"num_splits": None, "total_bandwidth": bandwidth * len(freqs), "groups": [freqs]}]
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results = sorted(usages, key=lambda f: f["total_bandwidth"])
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for r in results:
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logger.debug("splits: {0}, total: {1}".format(r["num_splits"], r["total_bandwidth"]))
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return results[0]["groups"]
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def setupService(self, mode, frequency, source):
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logger.debug("setting up service {0} on frequency {1}".format(mode, frequency))
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# TODO selecting outputs will need some more intelligence here
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if mode == "packet":
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output = AprsServiceOutput(frequency)
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else:
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output = WsjtServiceOutput(frequency)
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d = dsp(output)
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d.nc_port = source.getPort()
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d.set_offset_freq(frequency - source.getProps()["center_freq"])
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if mode == "packet":
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d.set_demodulator("nfm")
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d.set_bpf(-4000, 4000)
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elif mode == "wspr":
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d.set_demodulator("usb")
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# WSPR only samples between 1400 and 1600 Hz
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d.set_bpf(1350, 1650)
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else:
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d.set_demodulator("usb")
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d.set_bpf(0, 3000)
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d.set_secondary_demodulator(mode)
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d.set_audio_compression("none")
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d.set_samp_rate(source.getProps()["samp_rate"])
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d.set_service()
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d.start()
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return d
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class WsjtHandler(object):
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def write_wsjt_message(self, msg):
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pass
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class AprsHandler(object):
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def write_aprs_data(self, data):
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pass
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class Services(object):
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@staticmethod
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def start():
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if not PropertyManager.getSharedInstance()["services_enabled"]:
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return
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for source in SdrService.getSources().values():
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ServiceHandler(source)
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class Service(object):
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pass
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class WsjtService(Service):
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pass
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