restore aprs functionality

csdr/chain/digimodes.py

@@ -1,7 +1,10 @@
 from csdr.chain.demodulator import SecondaryDemodulator, FixedAudioRateChain, DialFrequencyReceiver
 from owrx.audio.chopper import AudioChopper
-from pycsdr.modules import Agc, Convert
+from owrx.aprs.kiss import KissDeframer
+from owrx.aprs import Ax25Parser, AprsParser
+from pycsdr.modules import Convert, FmDemod
 from pycsdr.types import Format
+from owrx.aprs.module import DirewolfModule
 
 
 class AudioChopperDemodulator(SecondaryDemodulator, FixedAudioRateChain, DialFrequencyReceiver):
@@ -16,3 +19,26 @@ class AudioChopperDemodulator(SecondaryDemodulator, FixedAudioRateChain, DialFre
 
     def setDialFrequency(self, frequency: int) -> None:
         self.chopper.setDialFrequency(frequency)
+
+
+class PacketDemodulator(SecondaryDemodulator, FixedAudioRateChain, 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)