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   1 #
   2 # Copyright 2008 Free Software Foundation, Inc.
   3 #
   4 # This file is part of GNU Radio
   5 #
   6 # GNU Radio is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 3, or (at your option)
   9 # any later version.
  10 #
  11 # GNU Radio is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with GNU Radio; see the file COPYING.  If not, write to
  18 # the Free Software Foundation, Inc., 51 Franklin Street,
  19 # Boston, MA 02110-1301, USA.
  20 #
  21
  22 from gnuradio import gr
  23 import threading
  24 import numpy
  25 import time
  26
  27 class _probe_base(gr.hier_block2, threading.Thread):
  28         """
  29         A hier2 block with float output and probe input.
  30         The thread polls the prope for values and writes to a message source.
  31         """
  32
  33         def __init__(self, probe_block, probe_callback, probe_rate):
  34                 #init hier block
  35                 gr.hier_block2.__init__(
  36                         self, 'probe',
  37                         gr.io_signature(1, 1, probe_block.input_signature().sizeof_stream_items()[0]),
  38                         gr.io_signature(1, 1, gr.sizeof_float),
  39                 )
  40                 self._probe_callback = probe_callback
  41                 self.set_probe_rate(probe_rate)
  42                 #create message source
  43                 message_source = gr.message_source(gr.sizeof_float, 1)
  44                 self._msgq = message_source.msgq()
  45                 #connect
  46                 self.connect(self, probe_block)
  47                 self.connect(message_source, self)
  48                 #setup thread
  49                 threading.Thread.__init__(self)
  50                 self.setDaemon(True)
  51                 self.start()
  52
  53         def run(self):
  54                 """
  55                 Infinite polling loop.
  56                 """
  57                 while True:
  58                         time.sleep(1.0/self._probe_rate)
  59                         arr = numpy.array(self._probe_callback(), numpy.float32)
  60                         msg = gr.message_from_string(arr.tostring(), 0, gr.sizeof_float, 1)
  61                         self._msgq.insert_tail(msg)
  62
  63         def set_probe_rate(self, probe_rate):
  64                 self._probe_rate = probe_rate
  65
  66 #######################################################################################
  67 ## Probe: Average Magnitude Squared
  68 #######################################################################################
  69 class _probe_avg_mag_sqrd_base(_probe_base):
  70         def __init__(self, threshold, alpha, probe_rate):
  71                 #create block
  72                 probe_block = self._probe_block_contructor[0](threshold, alpha)
  73                 #forward callbacks
  74                 self.set_alpha = probe_block.set_alpha
  75                 self.set_threshold = probe_block.set_threshold
  76                 #init
  77                 _probe_base.__init__(self, probe_block, probe_block.level, probe_rate)
  78
  79 class probe_avg_mag_sqrd_c(_probe_avg_mag_sqrd_base): _probe_block_contructor = (gr.probe_avg_mag_sqrd_c,)
  80 class probe_avg_mag_sqrd_f(_probe_avg_mag_sqrd_base): _probe_block_contructor = (gr.probe_avg_mag_sqrd_f,)
  81
  82 #######################################################################################
  83 ## Probe: Density
  84 #######################################################################################
  85 class probe_density_b(_probe_base):
  86         def __init__(self, alpha, probe_rate):
  87                 #create block
  88                 probe_block = gr.probe_density_b(alpha)
  89                 #forward callbacks
  90                 self.set_alpha = probe_block.set_alpha
  91                 #init
  92                 _probe_base.__init__(self, probe_block, probe_block.density, probe_rate)
  93
  94 #######################################################################################
  95 ## Probe: MPSK SNR
  96 #######################################################################################
  97 class probe_mpsk_snr_c(_probe_base):
  98         def __init__(self, type, alpha, probe_rate):
  99                 """
 100                 Type can be "snr", "signal_mean", or "noise_variance"
 101                 """
 102                 #create block
 103                 probe_block = gr.probe_mpsk_snr_c(alpha)
 104                 #forward callbacks
 105                 self.set_alpha = probe_block.set_alpha
 106                 #init
 107                 _probe_base.__init__(self, probe_block, getattr(probe_block, type), probe_rate)