openwebrx-clone/csdr/chain/digimodes.py
2021-10-01 00:52:32 +02:00

92 lines
3.1 KiB
Python

from csdr.chain.demodulator import ServiceDemodulator, SecondaryDemodulator, DialFrequencyReceiver, SecondarySelectorChain
from owrx.audio.chopper import AudioChopper, AudioChopperParser
from owrx.aprs.kiss import KissDeframer
from owrx.aprs import Ax25Parser, AprsParser
from pycsdr.modules import Convert, FmDemod, Agc, TimingRecovery, DBPskDecoder, VaricodeDecoder
from pycsdr.types import Format
from owrx.aprs.module import DirewolfModule
from digiham.modules import FskDemodulator, PocsagDecoder
from owrx.pocsag import PocsagParser
class AudioChopperDemodulator(ServiceDemodulator, DialFrequencyReceiver):
def __init__(self, mode: str, parser: AudioChopperParser):
self.chopper = AudioChopper(mode, parser)
workers = [Convert(Format.FLOAT, Format.SHORT), self.chopper]
super().__init__(workers)
def getFixedAudioRate(self):
return 12000
def setDialFrequency(self, frequency: int) -> None:
self.chopper.setDialFrequency(frequency)
class PacketDemodulator(ServiceDemodulator, DialFrequencyReceiver):
def __init__(self, service: bool = False):
self.parser = AprsParser()
workers = [
FmDemod(),
Convert(Format.FLOAT, Format.SHORT),
DirewolfModule(service=service),
KissDeframer(),
Ax25Parser(),
self.parser,
]
super().__init__(workers)
def supportsSquelch(self) -> bool:
return False
def getFixedAudioRate(self) -> int:
return 48000
def setDialFrequency(self, frequency: int) -> None:
self.parser.setDialFrequency(frequency)
class PocsagDemodulator(ServiceDemodulator, DialFrequencyReceiver):
def __init__(self):
self.parser = PocsagParser()
workers = [
FmDemod(),
FskDemodulator(samplesPerSymbol=40, invert=True),
PocsagDecoder(),
self.parser,
]
super().__init__(workers)
def supportsSquelch(self) -> bool:
return False
def getFixedAudioRate(self) -> int:
return 48000
def setDialFrequency(self, frequency: int) -> None:
self.parser.setDialFrequency(frequency)
class PskDemodulator(SecondaryDemodulator, SecondarySelectorChain):
def __init__(self, baudRate: float):
self.baudRate = baudRate
# this is an assumption, we will adjust in setSampleRate
self.sampleRate = 12000
secondary_samples_per_bits = int(round(self.sampleRate / self.baudRate)) & ~3
workers = [
Agc(Format.COMPLEX_FLOAT),
TimingRecovery(secondary_samples_per_bits, 0.5, 2, useQ=True),
DBPskDecoder(),
VaricodeDecoder(),
]
super().__init__(workers)
def getBandwidth(self):
return self.baudRate
def setSampleRate(self, sampleRate: int) -> None:
if sampleRate == self.sampleRate:
return
self.sampleRate = sampleRate
secondary_samples_per_bits = int(round(self.sampleRate / self.baudRate)) & ~3
self.replace(1, TimingRecovery(secondary_samples_per_bits, 0.5, 2, useQ=True))