get freedv back by modeling a corresponding module and chain

csdr/chain/freedv.py

@@ -0,0 +1,28 @@
+from csdr.chain.demodulator import BaseDemodulatorChain, FixedIfSampleRateChain, FixedAudioRateChain
+from owrx.freedv import FreeDVModule
+from pycsdr.modules import RealPart, Agc, Convert
+from pycsdr.types import Format
+
+
+class FreeDV(BaseDemodulatorChain, FixedIfSampleRateChain, FixedAudioRateChain):
+    def __init__(self):
+        agc = Agc(Format.SHORT)
+        agc.setMaxGain(30)
+        agc.setInitialGain(3)
+        workers = [
+            RealPart(),
+            Agc(Format.FLOAT),
+            Convert(Format.FLOAT, Format.SHORT),
+            FreeDVModule(),
+            agc,
+        ]
+        super().__init__(workers)
+
+    def getFixedIfSampleRate(self) -> int:
+        return 8000
+
+    def getFixedAudioRate(self) -> int:
+        return 8000
+
+    def supportsSquelch(self) -> bool:
+        return False