restore audio chopper decoding

csdr/chain/demodulator.py

@@ -1,3 +1,4 @@
+from pycsdr.modules import Reader
 from csdr.chain import Chain
 from abc import ABC, abstractmethod
 
@@ -10,6 +11,10 @@ class BaseDemodulatorChain(Chain):
         return True
 
 
+class SecondaryDemodulator(Chain):
+    pass
+
+
 class FixedAudioRateChain(ABC):
     @abstractmethod
     def getFixedAudioRate(self):

csdr/chain/digimodes.py

@@ -0,0 +1,14 @@
+from csdr.chain.demodulator import SecondaryDemodulator, FixedAudioRateChain
+from owrx.audio.chopper import AudioChopper
+from pycsdr.modules import Agc, Convert
+from pycsdr.types import Format
+
+
+class AudioChopperDemodulator(SecondaryDemodulator, FixedAudioRateChain):
+    # TODO parser typing
+    def __init__(self, mode: str, parser):
+        workers = [Convert(Format.FLOAT, Format.SHORT), AudioChopper(mode, parser)]
+        super().__init__(workers)
+
+    def getFixedAudioRate(self):
+        return 12000