add rockprog interface

owrx/source/__init__.py

@@ -125,6 +125,11 @@ class SdrSource(ABC):
             if self.monitor:
                 return
 
+            try:
+                self.preStart()
+            except Exception:
+                logger.exception("Exception during preStart()")
+
             cmd = self.getCommand()
             cmd = [c for c in cmd if c is not None]
 
@@ -176,7 +181,16 @@ class SdrSource(ABC):
 
         self.setState(SdrSource.STATE_FAILED if self.failed else SdrSource.STATE_RUNNING)
 
+    def preStart(self):
+        """
+        override this method in subclasses if there's anything to be done before starting up the actual SDR
+        """
+        pass
+
     def postStart(self):
+        """
+        override this method in subclasses if there's things to do after the actual SDR has started up
+        """
         pass
 
     def isAvailable(self):

owrx/source/fifi_sdr.py

@@ -1,5 +1,10 @@
 from owrx.command import Option
 from .direct import DirectSource
+from subprocess import Popen
+
+import logging
+
+logger = logging.getLogger(__name__)
 
 
 class FifiSdrSource(DirectSource):
@@ -14,3 +19,19 @@ class FifiSdrSource(DirectSource):
 
     def getFormatConversion(self):
         return ["csdr convert_s16_f", "csdr gain_ff 30"]
+
+    def sendRockProgFrequency(self, frequency):
+        process = Popen(["echo", "--vco", "-w", "--", "freq={}".format(frequency / 1E6)])
+        process.communicate()
+        rc = process.wait()
+        if rc != 0:
+            logger.warning("rockprog failed to set frequency; rc=%i", rc)
+
+    def preStart(self):
+        values = self.getCommandValues()
+        self.sendRockProgFrequency(values["tuner_freq"])
+
+    def onPropertyChange(self, name, value):
+        if name != "center_freq":
+            return
+        self.sendRockProgFrequency(value)