openwebrx-clone/owrx/fft.py
2021-04-09 18:16:25 +02:00

91 lines
2.7 KiB
Python

from owrx.config.core import CoreConfig
from owrx.config import Config
import csdr
from csdr.output import Output
import threading
from owrx.source import SdrSourceEventClient, SdrSourceState, SdrClientClass
from owrx.property import PropertyStack
import logging
logger = logging.getLogger(__name__)
class SpectrumThread(Output, SdrSourceEventClient):
def __init__(self, sdrSource):
self.sdrSource = sdrSource
super().__init__()
stack = PropertyStack()
stack.addLayer(0, self.sdrSource.props)
stack.addLayer(1, Config.get())
self.props = props = stack.filter(
"samp_rate",
"fft_size",
"fft_fps",
"fft_voverlap_factor",
"fft_compression",
)
self.dsp = dsp = csdr.Dsp(self)
dsp.nc_port = self.sdrSource.getPort()
dsp.set_demodulator("fft")
def set_fft_averages(changes=None):
samp_rate = props["samp_rate"]
fft_size = props["fft_size"]
fft_fps = props["fft_fps"]
fft_voverlap_factor = props["fft_voverlap_factor"]
dsp.set_fft_averages(
int(round(1.0 * samp_rate / fft_size / fft_fps / (1.0 - fft_voverlap_factor)))
if fft_voverlap_factor > 0
else 0
)
self.subscriptions = [
props.wireProperty("samp_rate", dsp.set_samp_rate),
props.wireProperty("fft_size", dsp.set_fft_size),
props.wireProperty("fft_fps", dsp.set_fft_fps),
props.wireProperty("fft_compression", dsp.set_fft_compression),
props.filter("samp_rate", "fft_size", "fft_fps", "fft_voverlap_factor").wire(set_fft_averages),
]
set_fft_averages()
dsp.set_temporary_directory(CoreConfig().get_temporary_directory())
logger.debug("Spectrum thread initialized successfully.")
def start(self):
self.sdrSource.addClient(self)
if self.sdrSource.isAvailable():
self.dsp.start()
def supports_type(self, t):
return t == "audio"
def receive_output(self, type, read_fn):
threading.Thread(target=self.pump(read_fn, self.sdrSource.writeSpectrumData)).start()
def stop(self):
self.dsp.stop()
self.sdrSource.removeClient(self)
for c in self.subscriptions:
c.cancel()
self.subscriptions = []
def getClientClass(self) -> SdrClientClass:
return SdrClientClass.USER
def onStateChange(self, state: SdrSourceState):
if state is SdrSourceState.STOPPING:
self.dsp.stop()
elif state is SdrSourceState.RUNNING:
self.dsp.start()
def onFail(self):
self.dsp.stop()
def onShutdown(self):
self.dsp.stop()