This file is indexed.

/usr/bin/gr_plot_iq is in gnuradio 3.7.2.1-5.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
#!/usr/bin/python2
#!/usr/bin/env python
#
# Copyright 2007,2008,2011 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.
#

try:
    import scipy
except ImportError:
    print "Please install SciPy to run this script (http://www.scipy.org/)"
    raise SystemExit, 1

try:
    from pylab import *
except ImportError:
    print "Please install Matplotlib to run this script (http://matplotlib.sourceforge.net/)"
    raise SystemExit, 1

from optparse import OptionParser

class draw_iq:
    def __init__(self, filename, options):
        self.hfile = open(filename, "r")
        self.block_length = options.block
        self.start = options.start
        self.sample_rate = options.sample_rate

        self.datatype = scipy.complex64
        self.sizeof_data = self.datatype().nbytes    # number of bytes per sample in file

        self.axis_font_size = 16
        self.label_font_size = 18
        self.title_font_size = 20
        self.text_size = 22

        # Setup PLOT
        self.fig = figure(1, figsize=(16, 9), facecolor='w')
        rcParams['xtick.labelsize'] = self.axis_font_size
        rcParams['ytick.labelsize'] = self.axis_font_size

        self.text_file     = figtext(0.10, 0.94, ("File: %s" % filename), weight="heavy", size=self.text_size)
        self.text_file_pos = figtext(0.10, 0.88, "File Position: ", weight="heavy", size=self.text_size)
        self.text_block    = figtext(0.40, 0.88, ("Block Size: %d" % self.block_length),
                                     weight="heavy", size=self.text_size)
        self.text_sr       = figtext(0.60, 0.88, ("Sample Rate: %.2f" % self.sample_rate),
                                     weight="heavy", size=self.text_size)
        self.make_plots()

        self.button_left_axes = self.fig.add_axes([0.45, 0.01, 0.05, 0.05], frameon=True)
        self.button_left = Button(self.button_left_axes, "<")
        self.button_left_callback = self.button_left.on_clicked(self.button_left_click)

        self.button_right_axes = self.fig.add_axes([0.50, 0.01, 0.05, 0.05], frameon=True)
        self.button_right = Button(self.button_right_axes, ">")
        self.button_right_callback = self.button_right.on_clicked(self.button_right_click)

        self.xlim = self.sp_iq.get_xlim()

        self.manager = get_current_fig_manager()
        connect('key_press_event', self.click)
        show()

    def get_data(self):
        self.text_file_pos.set_text("File Position: %d" % (self.hfile.tell()//self.sizeof_data))
        try:
            self.iq = scipy.fromfile(self.hfile, dtype=self.datatype, count=self.block_length)
        except MemoryError:
            print "End of File"
        else:
            self.reals = scipy.array([r.real for r in self.iq])
            self.imags = scipy.array([i.imag for i in self.iq])
            self.time = scipy.array([i*(1/self.sample_rate) for i in range(len(self.reals))])

    def make_plots(self):
        # if specified on the command-line, set file pointer
        self.hfile.seek(self.sizeof_data*self.start, 1)

        self.get_data()

        # Subplot for real and imaginary parts of signal
        self.sp_iq = self.fig.add_subplot(2,1,1, position=[0.075, 0.14, 0.85, 0.67])
        self.sp_iq.set_title(("I&Q"), fontsize=self.title_font_size, fontweight="bold")
        self.sp_iq.set_xlabel("Time (s)", fontsize=self.label_font_size, fontweight="bold")
        self.sp_iq.set_ylabel("Amplitude (V)", fontsize=self.label_font_size, fontweight="bold")
        self.plot_iq = plot(self.time, self.reals, 'bo-', self.time, self.imags, 'ro-')
        self.sp_iq.set_ylim([1.5*min([self.reals.min(), self.imags.min()]),
                             1.5*max([self.reals.max(), self.imags.max()])])
        self.sp_iq.set_xlim(self.time.min(), self.time.max())
        draw()

    def update_plots(self):
        self.plot_iq[0].set_data([self.time, self.reals])
        self.plot_iq[1].set_data([self.time, self.imags])
        self.sp_iq.set_ylim([1.5*min([self.reals.min(), self.imags.min()]),
                             1.5*max([self.reals.max(), self.imags.max()])])
        self.sp_iq.set_xlim(self.time.min(), self.time.max())
        draw()

    def click(self, event):
        forward_valid_keys = [" ", "down", "right"]
        backward_valid_keys = ["up", "left"]

        if(find(event.key, forward_valid_keys)):
            self.step_forward()

        elif(find(event.key, backward_valid_keys)):
            self.step_backward()

    def button_left_click(self, event):
        self.step_backward()

    def button_right_click(self, event):
        self.step_forward()

    def step_forward(self):
        self.get_data()
        self.update_plots()

    def step_backward(self):
        # Step back in file position
        if(self.hfile.tell() >= 2*self.sizeof_data*self.block_length ):
            self.hfile.seek(-2*self.sizeof_data*self.block_length, 1)
        else:
            self.hfile.seek(-self.hfile.tell(),1)
        self.get_data()
        self.update_plots()


def find(item_in, list_search):
    try:
	return list_search.index(item_in) != None
    except ValueError:
	return False

def main():
    usage="%prog: [options] input_filename"
    description = "Takes a GNU Radio complex binary file and displays the I&Q data versus time. You can set the block size to specify how many points to read in at a time and the start position in the file. By default, the system assumes a sample rate of 1, so in time, each sample is plotted versus the sample number. To set a true time axis, set the sample rate (-R or --sample-rate) to the sample rate used when capturing the samples."

    parser = OptionParser(conflict_handler="resolve", usage=usage, description=description)
    parser.add_option("-B", "--block", type="int", default=1000,
                      help="Specify the block size [default=%default]")
    parser.add_option("-s", "--start", type="int", default=0,
                      help="Specify where to start in the file [default=%default]")
    parser.add_option("-R", "--sample-rate", type="float", default=1.0,
                      help="Set the sampler rate of the data [default=%default]")

    (options, args) = parser.parse_args ()
    if len(args) != 1:
        parser.print_help()
        raise SystemExit, 1
    filename = args[0]

    dc = draw_iq(filename, options)

if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt:
        pass