add some first structure for DAB decoding

csdr/chain/dablin.py

@@ -0,0 +1,21 @@
+from csdr.chain.demodulator import BaseDemodulatorChain, FixedIfSampleRateChain, FixedAudioRateChain, HdAudio
+from csdreti.modules import EtiDecoder
+from owrx.dab.dablin import DablinModule
+from pycsdr.modules import Downmix
+from pycsdr.types import Format
+
+
+class Dablin(BaseDemodulatorChain, FixedIfSampleRateChain, FixedAudioRateChain, HdAudio):
+    def __init__(self):
+        workers = [
+            EtiDecoder(),
+            DablinModule(),
+            Downmix(Format.FLOAT),
+        ]
+        super().__init__(workers)
+
+    def getFixedIfSampleRate(self) -> int:
+        return 2048000
+
+    def getFixedAudioRate(self) -> int:
+        return 48000