openwebrx-clone/owrx/fft.py

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from owrx.config import Config
from csdr.chain.fft import FftChain
from owrx.source import SdrSourceEventClient, SdrSourceState, SdrClientClass
from owrx.property import PropertyStack
from pycsdr.modules import Buffer
import threading
import logging
logger = logging.getLogger(__name__)
class SpectrumThread(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 = stack.filter(
"samp_rate",
"fft_size",
"fft_fps",
"fft_voverlap_factor",
"fft_compression",
)
self.dsp = None
self.reader = None
self.subscriptions = []
logger.debug("Spectrum thread initialized successfully.")
def start(self):
if self.dsp is not None:
return
self.dsp = FftChain(
self.props['samp_rate'],
self.props['fft_size'],
self.props['fft_voverlap_factor'],
self.props['fft_fps'],
self.props['fft_compression']
)
self.sdrSource.addClient(self)
self.subscriptions += [
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self.props.filter("fft_size").wire(self.restart),
# these props can be set on the fly
self.props.wireProperty("samp_rate", self.dsp.setSampleRate),
self.props.wireProperty("fft_fps", self.dsp.setFps),
self.props.wireProperty("fft_voverlap_factor", self.dsp.setVOverlapFactor),
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self.props.wireProperty("fft_compression", self.dsp.setCompression),
]
buffer = Buffer(self.dsp.getOutputFormat())
self.dsp.setWriter(buffer)
self.reader = buffer.getReader()
threading.Thread(target=self.dsp.pump(self.reader.read, self.sdrSource.writeSpectrumData)).start()
if self.sdrSource.isAvailable():
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self.dsp.setReader(self.sdrSource.getBuffer().getReader())
def stop(self):
if self.dsp is None:
return
self.dsp.stop()
self.dsp = None
self.reader.stop()
self.reader = None
self.sdrSource.removeClient(self)
while self.subscriptions:
self.subscriptions.pop().cancel()
def restart(self, *args, **kwargs):
self.stop()
self.start()
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def getClientClass(self) -> SdrClientClass:
return SdrClientClass.USER
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def onStateChange(self, state: SdrSourceState):
if state is SdrSourceState.STOPPING:
self.dsp.stop()
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elif state == SdrSourceState.RUNNING:
if self.dsp is None:
self.start()
else:
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self.dsp.setReader(self.sdrSource.getBuffer().getReader())
def onFail(self):
if self.dsp is None:
return
self.dsp.stop()
def onShutdown(self):
if self.dsp is None:
return
self.dsp.stop()