openwebrx-clone/csdr/chain/digiham.py

from csdr.chain.demodulator import BaseDemodulatorChain
from pycsdr.modules import FmDemod, Agc, Writer
from pycsdr.types import Format
from digiham.modules import DstarDecoder, DcBlock, FskDemodulator, GfskDemodulator, DigitalVoiceFilter, MbeSynthesizer, NarrowRrcFilter, NxdnDecoder, DmrDecoder, WideRrcFilter, YsfDecoder
from digiham.ambe import Modes


class DigihamChain(BaseDemodulatorChain):
    def __init__(self, fskDemodulator, decoder, mbeMode, filter=None, codecserver: str = ""):
        self.decoder = decoder
        if codecserver is None:
            codecserver = ""
        agc = Agc(Format.SHORT)
        agc.setMaxGain(30)
        agc.setInitialGain(3)
        workers = [FmDemod(), DcBlock()]
        if filter is not None:
            workers += [filter]
        workers += [
            fskDemodulator,
            decoder,
            MbeSynthesizer(mbeMode, codecserver),
            DigitalVoiceFilter(),
            agc
        ]
        super().__init__(workers)

    def getFixedIfSampleRate(self):
        return 48000

    def getFixedAudioRate(self):
        return 8000

    def setMetaWriter(self, writer: Writer):
        self.decoder.setMetaWriter(writer)

    def supportsSquelch(self):
        return False


class Dstar(DigihamChain):
    def __init__(self, codecserver: str = ""):
        super().__init__(
            fskDemodulator=FskDemodulator(samplesPerSymbol=10),
            decoder=DstarDecoder(),
            mbeMode=Modes.DStarMode,
            codecserver=codecserver
        )


class Nxdn(DigihamChain):
    def __init__(self, codecserver: str = ""):
        super().__init__(
            fskDemodulator=GfskDemodulator(samplesPerSymbol=20),
            decoder=NxdnDecoder(),
            mbeMode=Modes.NxdnMode,
            filter=NarrowRrcFilter(),
            codecserver=codecserver
        )


class Dmr(DigihamChain):
    def __init__(self, codecserver: str = ""):
        super().__init__(
            fskDemodulator=GfskDemodulator(samplesPerSymbol=10),
            decoder=DmrDecoder(),
            mbeMode=Modes.DmrMode,
            filter=WideRrcFilter(),
            codecserver=codecserver,
        )

    def setSlotFilter(self, slotFilter: int) -> None:
        self.decoder.setSlotFilter(slotFilter)


class Ysf(DigihamChain):
    def __init__(self, codecserver: str = ""):
        super().__init__(
            fskDemodulator=GfskDemodulator(samplesPerSymbol=10),
            decoder=YsfDecoder(),
            mbeMode=Modes.YsfMode,
            filter=WideRrcFilter(),
            codecserver=codecserver
        )