import threading from owrx.source import SdrSourceEventClient, SdrSourceState, SdrClientClass from owrx.sdr import SdrService from owrx.bands import Bandplan from owrx.config import Config from owrx.source.resampler import Resampler from owrx.property import PropertyLayer, PropertyDeleted from owrx.service.schedule import ServiceScheduler from owrx.service.chain import ServiceDemodulatorChain from owrx.modes import Modes, DigitalMode from typing import Union, Optional from csdr.chain.demodulator import BaseDemodulatorChain, ServiceDemodulator, DialFrequencyReceiver from pycsdr.modules import Buffer import logging logger = logging.getLogger(__name__) class ServiceHandler(SdrSourceEventClient): def __init__(self, source): self.lock = threading.RLock() self.services = [] self.source = source self.startupTimer = None self.activitySub = None self.running = False props = self.source.getProps() self.enabledSub = props.wireProperty("services", self._receiveEvent) self.decodersSub = None # need to call _start() manually if property is not set since the default is True, but the initial call is only # made if the property is present if "services" not in props: self._start() def _receiveEvent(self, state): # deletion means fall back to default, which is True if state is PropertyDeleted: state = True if self.running == state: return if state: self._start() else: self._stop() def _start(self): self.running = True self.source.addClient(self) props = self.source.getProps() self.activitySub = props.filter("center_freq", "samp_rate").wire(self.onFrequencyChange) self.decodersSub = Config.get().wireProperty("services_decoders", self.onFrequencyChange) if self.source.isAvailable(): self._scheduleServiceStartup() def _stop(self): if self.activitySub is not None: self.activitySub.cancel() self.activitySub = None if self.decodersSub is not None: self.decodersSub.cancel() self.decodersSub = None self._cancelStartupTimer() self.source.removeClient(self) self.stopServices() self.running = False def getClientClass(self) -> SdrClientClass: return SdrClientClass.INACTIVE def onStateChange(self, state: SdrSourceState): if state is SdrSourceState.RUNNING: self._scheduleServiceStartup() elif state is SdrSourceState.STOPPING: logger.debug("sdr source becoming unavailable; stopping services.") self.stopServices() def onFail(self): logger.debug("sdr source failed; stopping services.") self.stopServices() def onShutdown(self): logger.debug("sdr source is shutting down; shutting down service handler, too.") self.shutdown() def onEnable(self): self._scheduleServiceStartup() def isSupported(self, mode): configured = Config.get()["services_decoders"] available = [m.modulation for m in Modes.getAvailableServices()] return mode in configured and mode in available def shutdown(self): self._stop() if self.enabledSub is not None: self.enabledSub.cancel() self.enabledSub = None def stopServices(self): with self.lock: services = self.services self.services = [] for service in services: service.stop() def onFrequencyChange(self, changes): self.stopServices() if not self.source.isAvailable(): return self._scheduleServiceStartup() def _cancelStartupTimer(self): if self.startupTimer: self.startupTimer.cancel() self.startupTimer = None def _scheduleServiceStartup(self): self._cancelStartupTimer() self.startupTimer = threading.Timer(10, self.updateServices) self.startupTimer.start() def updateServices(self): with self.lock: 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 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: if len(group) > 1: cf = self.get_center_frequency(group) bw = self.get_bandwidth(group) logger.debug("setting up resampler on center frequency: {0}, bandwidth: {1}".format(cf, bw)) resampler_props = PropertyLayer(center_freq=cf, samp_rate=bw) resampler = Resampler(resampler_props, self.source) 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) else: dial = group[0] self.services.append(self.setupService(dial["mode"], dial["frequency"], self.source)) def get_min_max(self, group): frequencies = sorted(group, key=lambda f: f["frequency"]) lowest = frequencies[0] min = lowest["frequency"] + Modes.findByModulation(lowest["mode"]).get_bandpass().low_cut highest = frequencies[-1] max = highest["frequency"] + Modes.findByModulation(highest["mode"]).get_bandpass().high_cut return min, max def get_center_frequency(self, group): min, max = self.get_min_max(group) return (min + max) / 2 def get_bandwidth(self, group): minFreq, maxFreq = self.get_min_max(group) # minimum bandwidth for a resampler: 25kHz return max((maxFreq - minFreq) * 1.15, 25000) 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_total_bandwidth(group): if len(group) > 1: return bandwidth + len(group) * self.get_bandwidth(group) else: return bandwidth total_bandwidth = sum([get_total_bandwidth(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)) modeObject = Modes.findByModulation(mode) if not isinstance(modeObject, DigitalMode): logger.warning("mode is not a digimode: %s", mode) return None demod = self._getDemodulator(modeObject.get_modulation()) secondaryDemod = self._getSecondaryDemodulator(modeObject.modulation) center_freq = source.getProps()["center_freq"] sampleRate = source.getProps()["samp_rate"] bandpass = modeObject.get_bandpass() if isinstance(secondaryDemod, DialFrequencyReceiver): secondaryDemod.setDialFrequency(frequency) chain = ServiceDemodulatorChain(demod, secondaryDemod, sampleRate, frequency - center_freq) chain.setBandPass(bandpass.low_cut, bandpass.high_cut) chain.setReader(source.getBuffer().getReader()) # dummy buffer, we don't use the output right now buffer = Buffer(chain.getOutputFormat()) chain.setWriter(buffer) return chain # TODO move this elsewhere def _getDemodulator(self, demod: Union[str, BaseDemodulatorChain]): if isinstance(demod, BaseDemodulatorChain): return demod # TODO: move this to Modes if demod == "nfm": from csdr.chain.analog import NFm return NFm(48000) elif demod in ["usb", "lsb", "cw"]: from csdr.chain.analog import Ssb return Ssb() # TODO move this elsewhere def _getSecondaryDemodulator(self, mod) -> Optional[ServiceDemodulator]: if isinstance(mod, ServiceDemodulatorChain): return mod # TODO add remaining modes if mod in ["ft8", "wspr", "jt65", "jt9", "ft4", "fst4", "fst4w", "q65"]: from csdr.chain.digimodes import AudioChopperDemodulator from owrx.wsjt import WsjtParser return AudioChopperDemodulator(mod, WsjtParser()) elif mod == "js8": from csdr.chain.digimodes import AudioChopperDemodulator from owrx.js8 import Js8Parser return AudioChopperDemodulator(mod, Js8Parser()) elif mod == "packet": from csdr.chain.digimodes import PacketDemodulator return PacketDemodulator(service=True) return None class Services(object): handlers = {} schedulers = {} @staticmethod def start(): config = Config.get() config.wireProperty("services_enabled", Services._receiveEnabledEvent) activeSources = SdrService.getActiveSources() activeSources.wire(Services._receiveDeviceEvent) for key, source in activeSources.items(): Services.schedulers[key] = ServiceScheduler(source) @staticmethod def _receiveEnabledEvent(state): if state: for key, source in SdrService.getActiveSources().__dict__().items(): Services.handlers[key] = ServiceHandler(source) else: for handler in list(Services.handlers.values()): handler.shutdown() Services.handlers = {} @staticmethod def _receiveDeviceEvent(changes): for key, source in changes.items(): if source is PropertyDeleted: if key in Services.handlers: Services.handlers[key].shutdown() del Services.handlers[key] if key in Services.schedulers: Services.schedulers[key].shutdown() del Services.schedulers[key] else: Services.schedulers[key] = ServiceScheduler(source) if Config.get()["services_enabled"]: Services.handlers[key] = ServiceHandler(source) @staticmethod def stop(): for handler in list(Services.handlers.values()): handler.shutdown() Services.handlers = {} for scheduler in list(Services.schedulers.values()): scheduler.shutdown() Services.schedulers = {}