re-add m17

csdr/chain/m17.py

@@ -0,0 +1,26 @@
+from csdr.chain.demodulator import BaseDemodulatorChain, FixedIfSampleRateChain, FixedAudioRateChain
+from owrx.m17 import M17Module
+from pycsdr.modules import FmDemod, Limit, Convert
+from pycsdr.types import Format
+from digiham.modules import DcBlock
+
+
+class M17Chain(BaseDemodulatorChain, FixedIfSampleRateChain, FixedAudioRateChain):
+    def __init__(self):
+        workers = [
+            FmDemod(),
+            DcBlock(),
+            Limit(),
+            Convert(Format.FLOAT, Format.SHORT),
+            M17Module(),
+        ]
+        super().__init__(workers)
+
+    def getFixedIfSampleRate(self) -> int:
+        return 48000
+
+    def getFixedAudioRate(self) -> int:
+        return 8000
+
+    def supportsSquelch(self) -> bool:
+        return False