296 lines
9.8 KiB
Python
296 lines
9.8 KiB
Python
import threading
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from owrx.source import SdrSource, SdrSourceEventClient
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from owrx.sdr import SdrService
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from owrx.bands import Bandplan
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from csdr.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.js8 import Js8Parser
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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
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from js8py import Js8Frame
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from abc import ABCMeta, abstractmethod
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from .schedule import ServiceScheduler
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from owrx.modes import Modes
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import logging
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logger = logging.getLogger(__name__)
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class ServiceOutput(output, metaclass=ABCMeta):
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def __init__(self, frequency):
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self.frequency = frequency
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@abstractmethod
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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, name="service_output_receive").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 Js8ServiceOutput(ServiceOutput):
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def getParser(self):
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return Js8Parser(Js8Handler())
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def supports_type(self, t):
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return t == "js8_demod"
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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.scheduler = None
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self.source.addClient(self)
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props = self.source.getProps()
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props.filter("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 or "scheduler" in props:
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self.scheduler = ServiceScheduler(self.source)
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def getClientClass(self):
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return SdrSource.CLIENT_INACTIVE
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def onStateChange(self, state):
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if state == SdrSource.STATE_RUNNING:
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self.scheduleServiceStartup()
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elif state == SdrSource.STATE_STOPPING:
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logger.debug("sdr source becoming unavailable; stopping services.")
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self.stopServices()
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elif state == SdrSource.STATE_FAILED:
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logger.debug("sdr source failed; stopping services.")
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self.stopServices()
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if self.scheduler:
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self.scheduler.shutdown()
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def onBusyStateChange(self, state):
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pass
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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.stopServices()
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self.source.removeClient(self)
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if self.scheduler:
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self.scheduler.shutdown()
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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 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 updateServices(self):
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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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self.services.append(self.setupService(dial["mode"], dial["frequency"], self.source))
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else:
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for group in groups:
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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("group center frequency: {0}, bandwidth: {1}".format(cf, bw))
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resampler_props = PropertyLayer()
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resampler_props["center_freq"] = cf
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resampler_props["samp_rate"] = bw
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resampler = Resampler(resampler_props, self.source)
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resampler.start()
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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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# resampler goes in after the services since it must not be shutdown as long as the services are still running
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self.services.append(resampler)
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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, 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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return bandwidth + len(group) * self.get_bandwidth(group)
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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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# 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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elif mode == "js8":
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output = Js8ServiceOutput(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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center_freq = source.getProps()["center_freq"]
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d.set_offset_freq(frequency - center_freq)
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d.set_center_freq(center_freq)
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modeObject = Modes.findByModulation(mode)
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d.set_demodulator(modeObject.get_modulation())
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d.set_bandpass(modeObject.get_bandpass())
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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_temporary_directory(Config.get()["temporary_directory"])
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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 Js8Handler(object):
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def write_js8_message(self, frame: Js8Frame, freq: int):
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pass
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class Services(object):
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handlers = []
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@staticmethod
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def start():
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if not Config.get()["services_enabled"]:
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return
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for source in SdrService.getSources().values():
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props = source.getProps()
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if "services" not in props or props["services"] is not False:
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Services.handlers.append(ServiceHandler(source))
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@staticmethod
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def stop():
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for handler in Services.handlers:
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handler.shutdown()
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Services.handlers = []
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