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/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"]