355 lines
13 KiB
Python
355 lines
13 KiB
Python
import threading
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from owrx.source import SdrSourceEventClient, SdrSourceState, SdrClientClass
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from owrx.sdr import SdrService
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from owrx.bands import Bandplan
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from owrx.config import Config
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from owrx.source.resampler import Resampler
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from owrx.property import PropertyLayer, PropertyDeleted
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from owrx.service.schedule import ServiceScheduler
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from owrx.service.chain import ServiceDemodulatorChain
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from owrx.modes import Modes, DigitalMode
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from typing import Union, Optional
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from csdr.chain.demodulator import BaseDemodulatorChain, ServiceDemodulator, DialFrequencyReceiver
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from pycsdr.modules import Buffer
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import logging
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logger = logging.getLogger(__name__)
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class ServiceHandler(SdrSourceEventClient):
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def __init__(self, source):
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self.lock = threading.RLock()
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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.activitySub = None
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self.running = False
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props = self.source.getProps()
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self.enabledSub = props.wireProperty("services", self._receiveEvent)
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self.decodersSub = None
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# need to call _start() manually if property is not set since the default is True, but the initial call is only
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# made if the property is present
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if "services" not in props:
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self._start()
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def _receiveEvent(self, state):
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# deletion means fall back to default, which is True
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if state is PropertyDeleted:
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state = True
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if self.running == state:
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return
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if state:
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self._start()
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else:
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self._stop()
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def _start(self):
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self.running = True
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self.source.addClient(self)
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props = self.source.getProps()
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self.activitySub = props.filter("center_freq", "samp_rate").wire(self.onFrequencyChange)
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self.decodersSub = Config.get().wireProperty("services_decoders", self.onFrequencyChange)
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if self.source.isAvailable():
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self._scheduleServiceStartup()
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def _stop(self):
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if self.activitySub is not None:
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self.activitySub.cancel()
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self.activitySub = None
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if self.decodersSub is not None:
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self.decodersSub.cancel()
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self.decodersSub = None
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self._cancelStartupTimer()
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self.source.removeClient(self)
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self.stopServices()
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self.running = False
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def getClientClass(self) -> SdrClientClass:
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return SdrClientClass.INACTIVE
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def onStateChange(self, state: SdrSourceState):
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if state is SdrSourceState.RUNNING:
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self._scheduleServiceStartup()
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elif state is SdrSourceState.STOPPING:
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logger.debug("sdr source becoming unavailable; stopping services.")
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self.stopServices()
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def onFail(self):
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logger.debug("sdr source failed; stopping services.")
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self.stopServices()
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def onShutdown(self):
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logger.debug("sdr source is shutting down; shutting down service handler, too.")
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self.shutdown()
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def onEnable(self):
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self._scheduleServiceStartup()
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def isSupported(self, mode):
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configured = Config.get()["services_decoders"]
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available = [m.modulation for m in Modes.getAvailableServices()]
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return mode in configured and mode in available
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def shutdown(self):
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self._stop()
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if self.enabledSub is not None:
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self.enabledSub.cancel()
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self.enabledSub = None
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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, changes):
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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 _cancelStartupTimer(self):
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if self.startupTimer:
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self.startupTimer.cancel()
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self.startupTimer = None
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def _scheduleServiceStartup(self):
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self._cancelStartupTimer()
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self.startupTimer = threading.Timer(10, self.updateServices)
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self.startupTimer.start()
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def updateServices(self):
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def addService(dial, source):
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mode = dial["mode"]
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frequency = dial["frequency"]
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try:
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service = self.setupService(mode, frequency, source)
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self.services.append(service)
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except Exception:
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logger.exception("Error setting up service %s on frequency %d", mode, frequency)
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with self.lock:
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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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groups = self.optimizeResampling(dials, sr)
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if groups is None:
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for dial in dials:
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addService(dial, self.source)
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else:
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for group in groups:
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if len(group) > 1:
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cf = self.get_center_frequency(group)
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bw = self.get_bandwidth(group)
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logger.debug("setting up resampler on center frequency: {0}, bandwidth: {1}".format(cf, bw))
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resampler_props = PropertyLayer(center_freq=cf, samp_rate=bw)
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resampler = Resampler(resampler_props, self.source)
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for dial in group:
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addService(dial, resampler)
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# resampler goes in after the services since it must not be shutdown as long as the services are
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# still running
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self.services.append(resampler)
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else:
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dial = group[0]
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addService(dial, self.source)
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def get_min_max(self, group):
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frequencies = sorted(group, key=lambda f: f["frequency"])
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lowest = frequencies[0]
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min = lowest["frequency"] + Modes.findByModulation(lowest["mode"]).get_bandpass().low_cut
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highest = frequencies[-1]
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max = highest["frequency"] + Modes.findByModulation(highest["mode"]).get_bandpass().high_cut
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return min, max
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def get_center_frequency(self, group):
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min, max = self.get_min_max(group)
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return (min + max) / 2
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def get_bandwidth(self, group):
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minFreq, maxFreq = self.get_min_max(group)
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# minimum bandwidth for a resampler: 25kHz
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return max((maxFreq - minFreq) * 1.15, 25000)
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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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{
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"frequency": freqs[i]["frequency"],
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"distance": freqs[i + 1]["frequency"] - freqs[i]["frequency"],
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}
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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_total_bandwidth(group):
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if len(group) > 1:
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return bandwidth + len(group) * self.get_bandwidth(group)
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else:
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return bandwidth
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total_bandwidth = sum([get_total_bandwidth(group) for group in groups])
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return {
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"num_splits": num_splits,
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"total_bandwidth": total_bandwidth,
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"groups": groups,
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}
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usages = [calculate_usage(i) for i in range(0, len(freqs))]
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# another possible outcome might be that it's best not to resample at all. this is a special case.
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usages += [
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{
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"num_splits": None,
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"total_bandwidth": bandwidth * len(freqs),
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"groups": [freqs],
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}
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]
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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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best = results[0]
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if best["num_splits"] is None:
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return None
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return best["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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modeObject = Modes.findByModulation(mode)
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if not isinstance(modeObject, DigitalMode):
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logger.warning("mode is not a digimode: %s", mode)
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return None
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demod = self._getDemodulator(modeObject.get_modulation())
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secondaryDemod = self._getSecondaryDemodulator(modeObject.modulation)
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center_freq = source.getProps()["center_freq"]
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sampleRate = source.getProps()["samp_rate"]
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bandpass = modeObject.get_bandpass()
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if isinstance(secondaryDemod, DialFrequencyReceiver):
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secondaryDemod.setDialFrequency(frequency)
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chain = ServiceDemodulatorChain(demod, secondaryDemod, sampleRate, frequency - center_freq)
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chain.setBandPass(bandpass.low_cut, bandpass.high_cut)
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chain.setReader(source.getBuffer().getReader())
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# dummy buffer, we don't use the output right now
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buffer = Buffer(chain.getOutputFormat())
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chain.setWriter(buffer)
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return chain
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# TODO move this elsewhere
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def _getDemodulator(self, demod: Union[str, BaseDemodulatorChain]):
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if isinstance(demod, BaseDemodulatorChain):
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return demod
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# TODO: move this to Modes
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if demod == "nfm":
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from csdr.chain.analog import NFm
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return NFm(48000)
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elif demod in ["usb", "lsb", "cw"]:
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from csdr.chain.analog import Ssb
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return Ssb()
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# TODO move this elsewhere
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def _getSecondaryDemodulator(self, mod) -> Optional[ServiceDemodulator]:
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if isinstance(mod, ServiceDemodulatorChain):
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return mod
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if mod in ["ft8", "wspr", "jt65", "jt9", "ft4", "fst4", "fst4w", "q65"]:
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from csdr.chain.digimodes import AudioChopperDemodulator
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from owrx.wsjt import WsjtParser
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return AudioChopperDemodulator(mod, WsjtParser())
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elif mod == "msk144":
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from csdr.chain.digimodes import Msk144Demodulator
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return Msk144Demodulator()
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elif mod == "js8":
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from csdr.chain.digimodes import AudioChopperDemodulator
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from owrx.js8 import Js8Parser
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return AudioChopperDemodulator(mod, Js8Parser())
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elif mod == "packet":
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from csdr.chain.digimodes import PacketDemodulator
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return PacketDemodulator(service=True)
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raise ValueError("unsupported service modulation: {}".format(mod))
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class Services(object):
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handlers = {}
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schedulers = {}
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@staticmethod
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def start():
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config = Config.get()
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config.wireProperty("services_enabled", Services._receiveEnabledEvent)
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activeSources = SdrService.getActiveSources()
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activeSources.wire(Services._receiveDeviceEvent)
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for key, source in activeSources.items():
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Services.schedulers[key] = ServiceScheduler(source)
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@staticmethod
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def _receiveEnabledEvent(state):
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if state:
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for key, source in SdrService.getActiveSources().__dict__().items():
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Services.handlers[key] = ServiceHandler(source)
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else:
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for handler in list(Services.handlers.values()):
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handler.shutdown()
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Services.handlers = {}
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@staticmethod
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def _receiveDeviceEvent(changes):
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for key, source in changes.items():
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if source is PropertyDeleted:
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if key in Services.handlers:
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Services.handlers[key].shutdown()
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del Services.handlers[key]
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if key in Services.schedulers:
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Services.schedulers[key].shutdown()
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del Services.schedulers[key]
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else:
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Services.schedulers[key] = ServiceScheduler(source)
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if Config.get()["services_enabled"]:
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Services.handlers[key] = ServiceHandler(source)
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@staticmethod
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def stop():
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for handler in list(Services.handlers.values()):
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handler.shutdown()
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Services.handlers = {}
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for scheduler in list(Services.schedulers.values()):
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scheduler.shutdown()
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Services.schedulers = {}
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