add msk144demodulator chain

csdr/chain/digimodes.py

@@ -1,4 +1,5 @@
 from csdr.chain.demodulator import ServiceDemodulator, SecondaryDemodulator, DialFrequencyReceiver, SecondarySelectorChain
+from csdr.module.msk144 import Msk144Module
 from owrx.audio.chopper import AudioChopper, AudioChopperParser
 from owrx.aprs.kiss import KissDeframer
 from owrx.aprs import Ax25Parser, AprsParser
@@ -20,6 +21,18 @@ class AudioChopperDemodulator(ServiceDemodulator, DialFrequencyReceiver):
         self.chopper.setDialFrequency(frequency)
 
 
+class Msk144Demodulator(ServiceDemodulator):
+    def __init__(self):
+        workers = [
+            Convert(Format.FLOAT, Format.SHORT),
+            Msk144Module(),
+        ]
+        super().__init__(workers)
+
+    def getFixedAudioRate(self) -> int:
+        return 12000
+
+
 class PacketDemodulator(ServiceDemodulator, DialFrequencyReceiver):
     def __init__(self, service: bool = False):
         self.parser = AprsParser()

csdr/module/msk144.py

@@ -0,0 +1,13 @@
+from pycsdr.types import Format
+from csdr.module import PopenModule
+
+
+class Msk144Module(PopenModule):
+    def getCommand(self):
+        return ["msk144decoder"]
+
+    def getInputFormat(self) -> Format:
+        return Format.SHORT
+
+    def getOutputFormat(self) -> Format:
+        return Format.CHAR

owrx/dsp.py

@@ -581,6 +581,9 @@ class DspManager(SdrSourceEventClient, ClientDemodulatorSecondaryDspEventClient)
             from csdr.chain.digimodes import AudioChopperDemodulator
             from owrx.wsjt import WsjtParser
             return AudioChopperDemodulator(mod, WsjtParser())
+        elif mod == "msk144":
+            from csdr.chain.digimodes import Msk144Demodulator
+            return Msk144Demodulator()
         elif mod == "js8":
             from csdr.chain.digimodes import AudioChopperDemodulator
             from owrx.js8 import Js8Parser

owrx/modes.py

@@ -120,6 +120,7 @@ class Modes(object):
         WsjtMode("fst4", "FST4", requirements=["wsjt-x-2-3"]),
         WsjtMode("fst4w", "FST4W", bandpass=Bandpass(1350, 1650), requirements=["wsjt-x-2-3"]),
         WsjtMode("q65", "Q65", requirements=["wsjt-x-2-4"]),
+        DigitalMode("msk144", "MSK144", requirements=["msk144"], underlying=["usb"], service=True),
         Js8Mode("js8", "JS8Call"),
         DigitalMode(
             "packet",