restore DRM functionality

csdr/chain/drm.py

@@ -0,0 +1,16 @@
+from csdr.chain.demodulator import BaseDemodulatorChain, FixedIfSampleRateChain, FixedAudioRateChain
+from pycsdr.modules import Convert
+from pycsdr.types import Format
+from owrx.drm import DrmModule
+
+
+class Drm(BaseDemodulatorChain, FixedIfSampleRateChain, FixedAudioRateChain):
+    def __init__(self):
+        workers = [Convert(Format.COMPLEX_FLOAT, Format.COMPLEX_SHORT), DrmModule()]
+        super().__init__(workers)
+
+    def getFixedIfSampleRate(self) -> int:
+        return 48000
+
+    def getFixedAudioRate(self) -> int:
+        return 48000