<?xml version="1.0"?> <!-- ################################################### ##Null Source ################################################### --> <block> <name>Null Source</name> <key>gr_null_source</key> <import>from gnuradio import gr</import> <make>gr.null_source($type.size*$vlen)</make> <param> <name>Output Type</name> <key>type</key> <type>enum</type> <option> <name>Complex</name> <key>complex</key> <opt>size:gr.sizeof_gr_complex</opt> </option> <option> <name>Float</name> <key>float</key> <opt>size:gr.sizeof_float</opt> </option> <option> <name>Int</name> <key>int</key> <opt>size:gr.sizeof_int</opt> </option> <option> <name>Short</name> <key>short</key> <opt>size:gr.sizeof_short</opt> </option> <option> <name>Byte</name> <key>byte</key> <opt>size:gr.sizeof_char</opt> </option> </param> <param> <name>Vec Length</name> <key>vlen</key> <value>1</value> <type>int</type> </param> <check>$vlen > 0</check> <source> <name>out</name> <type>$type</type> <vlen>$vlen</vlen> </source> </block>