import threading from owrx.socket import getAvailablePort from datetime import datetime, timezone, timedelta from owrx.source import SdrService from owrx.bands import Bandplan from csdr import dsp, output from owrx.wsjt import WsjtParser from owrx.aprs import AprsParser from owrx.config import PropertyManager from owrx.source import Resampler from owrx.feature import FeatureDetector import logging logger = logging.getLogger(__name__) class ServiceOutput(output): def __init__(self, frequency): self.frequency = frequency def getParser(self): # abstract method; implement in subclasses pass def receive_output(self, t, read_fn): parser = self.getParser() parser.setDialFrequency(self.frequency) target = self.pump(read_fn, parser.parse) threading.Thread(target=target).start() class WsjtServiceOutput(ServiceOutput): def getParser(self): return WsjtParser(WsjtHandler()) def supports_type(self, t): return t == "wsjt_demod" class AprsServiceOutput(ServiceOutput): def getParser(self): return AprsParser(AprsHandler()) def supports_type(self, t): return t == "packet_demod" class ScheduleEntry(object): def __init__(self, startTime, endTime, profile): self.startTime = startTime self.endTime = endTime self.profile = profile def isCurrent(self, time): if self.startTime < self.endTime: return self.startTime <= time < self.endTime else: return self.startTime <= time or time < self.endTime def getProfile(self): return self.profile def getScheduledEnd(self): now = datetime.utcnow() end = now.combine(date=now.date(), time=self.endTime) while end < now: end += timedelta(days=1) return end def getNextActivation(self): now = datetime.utcnow() start = now.combine(date=now.date(), time=self.startTime) while start < now: start += timedelta(days=1) return start class Schedule(object): @staticmethod def parse(scheduleDict): entries = [] for time, profile in scheduleDict.items(): if len(time) != 9: logger.warning("invalid schedule spec: %s", time) continue startTime = datetime.strptime(time[0:4], "%H%M").replace(tzinfo=timezone.utc).time() endTime = datetime.strptime(time[5:9], "%H%M").replace(tzinfo=timezone.utc).time() entries.append(ScheduleEntry(startTime, endTime, profile)) return Schedule(entries) def __init__(self, entries): self.entries = entries def getCurrentEntry(self): current = [p for p in self.entries if p.isCurrent(datetime.utcnow().time())] if current: return current[0] return None def getNextEntry(self): s = sorted(self.entries, key=lambda e: e.getNextActivation()) if s: return s[0] return None class ServiceScheduler(object): def __init__(self, source, schedule): self.source = source self.schedule = Schedule.parse(schedule) self.active = False self.source.addClient(self) self.selectionTimer = None self.source.getProps().collect("center_freq", "samp_rate").wire(self.onFrequencyChange) self.scheduleSelection() def shutdown(self): self.cancelTimer() self.source.removeClient(self) def scheduleSelection(self, time=None): seconds = 10 if time is not None: delta = time - datetime.utcnow() seconds = delta.total_seconds() self.cancelTimer() self.selectionTimer = threading.Timer(seconds, self.selectProfile) self.selectionTimer.start() def cancelTimer(self): if self.selectionTimer: self.selectionTimer.cancel() def isActive(self): return self.active def onSdrAvailable(self): pass def onSdrUnavailable(self): self.scheduleSelection() def onSdrFailed(self): self.cancelTimer() def onFrequencyChange(self, name, value): self.scheduleSelection() def selectProfile(self): self.active = False if self.source.hasActiveClients(): logger.debug("source has active clients; not touching") return logger.debug("source seems to be idle, selecting profile for background services") entry = self.schedule.getCurrentEntry() if entry is None: logger.debug("schedule did not return a profile. checking next entry...") nextEntry = self.schedule.getNextEntry() if nextEntry is not None: self.scheduleSelection(nextEntry.getNextActivation()) return logger.debug("scheduling end for current profile: %s", entry.getScheduledEnd()) self.scheduleSelection(entry.getScheduledEnd()) try: self.active = True self.source.activateProfile(entry.getProfile()) self.source.start() except KeyError: pass class ServiceHandler(object): def __init__(self, source): self.lock = threading.Lock() self.services = [] self.source = source self.startupTimer = None self.source.addClient(self) props = self.source.getProps() props.collect("center_freq", "samp_rate").wire(self.onFrequencyChange) if self.source.isAvailable(): self.scheduleServiceStartup() self.scheduler = None if "schedule" in props: self.scheduler = ServiceScheduler(self.source, props["schedule"]) def isActive(self): return False def onSdrAvailable(self): self.scheduleServiceStartup() def onSdrUnavailable(self): logger.debug("sdr source becoming unavailable; stopping services.") self.stopServices() def onSdrFailed(self): logger.debug("sdr source failed; stopping services.") self.stopServices() def isSupported(self, mode): # TODO this should be in a more central place (the frontend also needs this) requirements = { 'ft8': 'wsjt-x', 'ft4': 'wsjt-x', 'jt65': 'wsjt-x', 'jt9': 'wsjt-x', 'wspr': 'wsjt-x', 'packet': 'packet', } fd = FeatureDetector() # this looks overly complicated... but i'd like modes with no requirements to be always available without # being listed in the hash above unavailable = [mode for mode, req in requirements.items() if not fd.is_available(req)] configured = PropertyManager.getSharedInstance()["services_decoders"] available = [mode for mode in configured if mode not in unavailable] return mode in available def shutdown(self): self.stopServices() self.source.removeClient(self) if self.scheduler: self.scheduler.shutdown() def stopServices(self): with self.lock: services = self.services self.services = [] for service in services: service.stop() def onFrequencyChange(self, key, value): self.stopServices() if not self.source.isAvailable(): return self.scheduleServiceStartup() def scheduleServiceStartup(self): if self.startupTimer: self.startupTimer.cancel() self.startupTimer = threading.Timer(10, self.updateServices) self.startupTimer.start() def updateServices(self): logger.debug("re-scheduling services due to sdr changes") self.stopServices() if not self.source.isAvailable(): logger.debug("sdr source is unavailable") return cf = self.source.getProps()["center_freq"] sr = self.source.getProps()["samp_rate"] srh = sr / 2 frequency_range = (cf - srh, cf + srh) dials = [ dial for dial in Bandplan.getSharedInstance().collectDialFrequencies(frequency_range) if self.isSupported(dial["mode"]) ] if not dials: logger.debug("no services available") return with self.lock: self.services = [] groups = self.optimizeResampling(dials, sr) if groups is None: for dial in dials: self.services.append(self.setupService(dial["mode"], dial["frequency"], self.source)) else: for group in groups: frequencies = sorted([f["frequency"] for f in group]) min = frequencies[0] max = frequencies[-1] cf = (min + max) / 2 bw = max - min logger.debug("group center frequency: {0}, bandwidth: {1}".format(cf, bw)) resampler_props = PropertyManager() resampler_props["center_freq"] = cf # TODO the + 24000 is a temporary fix since the resampling optimizer does not account for required bandwidths resampler_props["samp_rate"] = bw + 24000 resampler = Resampler(resampler_props, getAvailablePort(), self.source) resampler.start() for dial in group: self.services.append(self.setupService(dial["mode"], dial["frequency"], resampler)) # resampler goes in after the services since it must not be shutdown as long as the services are still running self.services.append(resampler) def optimizeResampling(self, freqs, bandwidth): freqs = sorted(freqs, key=lambda f: f["frequency"]) distances = [ {"frequency": freqs[i]["frequency"], "distance": freqs[i + 1]["frequency"] - freqs[i]["frequency"]} for i in range(0, len(freqs) - 1) ] distances = [d for d in distances if d["distance"] > 0] distances = sorted(distances, key=lambda f: f["distance"], reverse=True) def calculate_usage(num_splits): splits = sorted([f["frequency"] for f in distances[0:num_splits]]) previous = 0 groups = [] for split in splits: groups.append([f for f in freqs if previous < f["frequency"] <= split]) previous = split groups.append([f for f in freqs if previous < f["frequency"]]) def get_bandwitdh(group): freqs = sorted([f["frequency"] for f in group]) # the group will process the full BW once, plus the reduced BW once for each group member return bandwidth + len(group) * (freqs[-1] - freqs[0] + 24000) total_bandwidth = sum([get_bandwitdh(group) for group in groups]) return {"num_splits": num_splits, "total_bandwidth": total_bandwidth, "groups": groups} usages = [calculate_usage(i) for i in range(0, len(freqs))] # another possible outcome might be that it's best not to resample at all. this is a special case. usages += [{"num_splits": None, "total_bandwidth": bandwidth * len(freqs), "groups": [freqs]}] results = sorted(usages, key=lambda f: f["total_bandwidth"]) for r in results: logger.debug("splits: {0}, total: {1}".format(r["num_splits"], r["total_bandwidth"])) best = results[0] if best["num_splits"] is None: return None return best["groups"] def setupService(self, mode, frequency, source): logger.debug("setting up service {0} on frequency {1}".format(mode, frequency)) # TODO selecting outputs will need some more intelligence here if mode == "packet": output = AprsServiceOutput(frequency) else: output = WsjtServiceOutput(frequency) d = dsp(output) d.nc_port = source.getPort() d.set_offset_freq(frequency - source.getProps()["center_freq"]) if mode == "packet": d.set_demodulator("nfm") d.set_bpf(-4000, 4000) elif mode == "wspr": d.set_demodulator("usb") # WSPR only samples between 1400 and 1600 Hz d.set_bpf(1350, 1650) else: d.set_demodulator("usb") d.set_bpf(0, 3000) d.set_secondary_demodulator(mode) d.set_audio_compression("none") d.set_samp_rate(source.getProps()["samp_rate"]) d.set_service() d.start() return d class WsjtHandler(object): def write_wsjt_message(self, msg): pass class AprsHandler(object): def write_aprs_data(self, data): pass class Services(object): handlers = [] @staticmethod def start(): if not PropertyManager.getSharedInstance()["services_enabled"]: return for source in SdrService.getSources().values(): Services.handlers.append(ServiceHandler(source)) @staticmethod def stop(): for handler in Services.handlers: handler.shutdown() Services.handlers = [] class Service(object): pass class WsjtService(Service): pass