refactor sources to be more flexible

owrx/source/hackrf.py

@@ -1,9 +1,23 @@
-from . import SdrSource
+from .direct import DirectSource
+from owrx.command import Flag, Option
 
 
-class HackrfSource(SdrSource):
-    def getCommand(self):
-        return "hackrf_transfer -s {samp_rate} -f {tuner_freq} -g {rf_gain} -l{lna_gain} -a{rf_amp} -r-"
+class HackrfSource(DirectSource):
+    def __init__(self, id, props, port):
+        super().__init__(id, props, port)
+        self.getCommandMapper().setBase("hackrf_transfer").setMappings({
+            "samp_rate": Option("-s"),
+            "tuner_freq": Option("-f"),
+            "rf_gain": Option("-g"),
+            "lna_gain": Option("-l"),
+            "rf_amp": Option("-a")
+        }).setStatic("-r-")
+
+    def getEventNames(self):
+        return super().getEventNames() + [
+            "lna_gain",
+            "rf_amp",
+        ]
 
     def getFormatConversion(self):
         return "csdr convert_s8_f"