Imported Upstream version 3.2.2

[debian/gnuradio] / grc / grc_gnuradio / blks2 / variable_sink.py

diff --git a/grc/grc_gnuradio/blks2/variable_sink.py b/grc/grc_gnuradio/blks2/variable_sink.py
new file mode 100644 (file)
index 0000000..cad3b8b
--- /dev/null
+++ b/grc/grc_gnuradio/blks2/variable_sink.py
@@ -0,0 +1,64 @@
+#
+# Copyright 2009 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+from gnuradio import gr
+import threading
+import numpy
+
+class _variable_sink_base(gr.hier_block2, threading.Thread):
+       """
+       The thread polls the message queue for values and writes to a callback.
+       """
+
+       def __init__(self, vlen, decim, callback):
+               self._vlen = vlen
+               self._callback = callback
+               self._item_size = self._size*self._vlen
+               #init hier block
+               gr.hier_block2.__init__(
+                       self, 'variable_sink',
+                       gr.io_signature(1, 1, self._item_size),
+                       gr.io_signature(0, 0, 0),
+               )
+               #create blocks
+               self._decimator = gr.keep_one_in_n(self._item_size, decim)
+               self._msgq = gr.msg_queue(2)
+               message_sink = gr.message_sink(self._item_size, self._msgq, False)
+               #connect
+               self.connect(self, self._decimator, message_sink)
+               #setup thread
+               threading.Thread.__init__(self)
+               self.setDaemon(True)
+               self.start() 
+
+       def set_decim(self, decim): self._decimator.set_n(decim)
+
+       def run(self):
+               while True: #truncate to item size, convert to array, callback
+                       msg = self._msgq.delete_head().to_string()[-self._item_size:]
+                       arr = map(self._cast, numpy.fromstring(msg, self._numpy))
+                       self._callback(self._vlen > 1 and arr or arr[0])
+
+class variable_sink_b(_variable_sink_base): _numpy, _size, _cast = numpy.int8, gr.sizeof_char, int
+class variable_sink_s(_variable_sink_base): _numpy, _size, _cast = numpy.int16, gr.sizeof_short, int
+class variable_sink_i(_variable_sink_base): _numpy, _size, _cast = numpy.int32, gr.sizeof_int, int
+class variable_sink_f(_variable_sink_base): _numpy, _size, _cast = numpy.float32, gr.sizeof_float, float
+class variable_sink_c(_variable_sink_base): _numpy, _size, _cast = numpy.complex64, gr.sizeof_gr_complex, complex