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