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

owrx/dsp.py

@@ -12,6 +12,7 @@ from csdr.chain.clientaudio import ClientAudioChain
 from csdr.chain.analog import NFm, WFm, Am, Ssb
 from csdr.chain.digiham import DigihamChain, Dmr, Dstar, Nxdn, Ysf
 from csdr.chain.m17 import M17Chain
+from csdr.chain.freedv import FreeDV
 from csdr.chain.drm import Drm
 from csdr.chain.fft import FftChain
 from csdr.chain.digimodes import AudioChopperDemodulator, PacketDemodulator, PocsagDemodulator
@@ -452,6 +453,8 @@ class DspManager(Output, SdrSourceEventClient):
             return M17Chain()
         elif demod == "drm":
             return Drm()
+        elif demod == "freedv":
+            return FreeDV()
 
     def setDemodulator(self, mod):
         demodulator = self._getDemodulator(mod)

owrx/freedv.py

@@ -0,0 +1,13 @@
+from pycsdr.types import Format
+from csdr.module import PopenModule
+
+
+class FreeDVModule(PopenModule):
+    def getInputFormat(self) -> Format:
+        return Format.SHORT
+
+    def getOutputFormat(self) -> Format:
+        return Format.SHORT
+
+    def getCommand(self):
+        return ["freedv_rx", "1600", "-", "-"]