added file player source

See “file_player” in config. Requires updated csdr with —bigendian
option to convert_s16_f and iq_swap_ff. Also requires xzcat to be
installed.

Sample files in new samples/ subdirectory. If larger sample file is too
big for distro remove it and reconfigure to use smaller one (which will
wrap around more quickly).

owrx/command.py

@@ -12,6 +12,7 @@ class CommandMapper(object):
         args = [a for a in args if a != ""]
         options = " ".join(args)
         command = "{0} {1}".format(self.base, options)
+        command = command.format(p=values)
         if self.static is not None:
             command += " " + self.static
         return command

owrx/feature.py

@@ -30,6 +30,7 @@ class FeatureDetector(object):
         "airspyhf": ["soapy_connector", "soapy_airspyhf"],
         "lime_sdr": ["soapy_connector", "soapy_lime_sdr"],
         "fifi_sdr": ["alsa", "rockprog"],
+        "file_player": ["xzcat"],
         "pluto_sdr": ["soapy_connector", "soapy_pluto_sdr"],
         "soapy_remote": ["soapy_connector", "soapy_remote"],
         "uhd": ["soapy_connector", "soapy_uhd"],
@@ -392,3 +393,11 @@ class FeatureDetector(object):
         You can find instructions and downloads [here](https://o28.sischa.net/fifisdr/trac/wiki/De%3Arockprog).
         """
         return self.command_is_runnable("rockprog")
+
+    def has_xzcat(self):
+        """
+        The "xzcat" executable is required to use the file player. It needs to be installed separately.
+
+        Install it from a system package manager, e.g. "sudo apt-get install xz-utils".
+        """
+        return self.command_is_runnable("xzcat")

owrx/source/file_player.py

@@ -0,0 +1,9 @@
+from .direct import DirectSource
+
+class FilePlayerSource(DirectSource):
+    def getCommandMapper(self):
+        cmd = "(while true; do xzcat {p[file]}; done) | csdr flowcontrol $(csdr ={p[samp_rate]}*{p[bytes_per_sample]}*1.05) 20 | {p[format_conversion]}"
+        return super().getCommandMapper().setBase(cmd)
+
+    def getEventNames(self):
+        return super().getEventNames() + ["file", "bytes_per_sample", "format_conversion"]