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#
# 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
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