numbersink2.py

这是用python语言写的一个数字广播的信号处理工具包。利用它

#!/usr/bin/env python
#
# Copyright 2003,2004,2005,2006,2007,2008 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., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
# 

from gnuradio import gr, gru, window
from gnuradio.wxgui import stdgui2
import wx
import gnuradio.wxgui.plot as plot
import numpy
import threading
import math    

default_numbersink_size = (640,240)
default_number_rate = gr.prefs().get_long('wxgui', 'number_rate', 15)

class number_sink_base(object):
    def __init__(self, input_is_real=False, unit='',base_value=0, minval=-100.0,maxval=100.0,factor=1.0,decimal_places=10, ref_level=50,
                 sample_rate=1, 
                 number_rate=default_number_rate,
                 average=False, avg_alpha=None, label='', peak_hold=False):

        # initialize common attributes
        self.unit=unit
        self.base_value = base_value
        self.minval=minval
        self.maxval=maxval
        self.factor=factor
        self.y_divs = 8
        self.decimal_places=decimal_places
        self.ref_level = ref_level
        self.sample_rate = sample_rate
        number_size=1
        self.number_size = number_size
        self.number_rate = number_rate
        self.average = average
        if avg_alpha is None:
            self.avg_alpha = 2.0 / number_rate
        else:
            self.avg_alpha = avg_alpha
        self.label = label
        self.peak_hold = peak_hold
        self.show_gauge = True
        self.input_is_real = input_is_real
        self.msgq = gr.msg_queue(2)         # queue that holds a maximum of 2 messages

    def set_decimal_places(self, decimal_places):
        self.decimal_places = decimal_places

    def set_ref_level(self, ref_level):
        self.ref_level = ref_level

    def print_current_value(self, comment):
        print comment,self.win.current_value

    def set_average(self, average):
        self.average = average
        if average:
            self.avg.set_taps(self.avg_alpha)
            self.set_peak_hold(False)
        else:
            self.avg.set_taps(1.0)

    def set_peak_hold(self, enable):
        self.peak_hold = enable
        if enable:
            self.set_average(False)
        self.win.set_peak_hold(enable)

    def set_show_gauge(self, enable):
        self.show_gauge = enable
        self.win.set_show_gauge(enable)

    def set_avg_alpha(self, avg_alpha):
        self.avg_alpha = avg_alpha

    def set_base_value(self, base_value):
        self.base_value = base_value
        

class number_sink_f(gr.hier_block2, number_sink_base):
    def __init__(self, parent, unit='',base_value=0,minval=-100.0,maxval=100.0,factor=1.0,
                 decimal_places=10, ref_level=50, sample_rate=1, 
                 number_rate=default_number_rate, average=False, avg_alpha=None,
                 label='', size=default_numbersink_size, peak_hold=False):

	gr.hier_block2.__init__(self, "number_sink_f",
				gr.io_signature(1, 1, gr.sizeof_float), # Input signature
				gr.io_signature(0, 0, 0))               # Output signature

        number_sink_base.__init__(self, unit=unit, input_is_real=True, base_value=base_value,
                               minval=minval,maxval=maxval,factor=factor,
                               decimal_places=decimal_places, ref_level=ref_level,
                               sample_rate=sample_rate, number_rate=number_rate,
                               average=average, avg_alpha=avg_alpha, label=label,
                               peak_hold=peak_hold)
         
        number_size=1                      
        one_in_n = gr.keep_one_in_n(gr.sizeof_float,
                                    max(1, int(sample_rate/number_rate)))
            
        self.avg = gr.single_pole_iir_filter_ff(1.0, number_size)
        sink = gr.message_sink(gr.sizeof_float , self.msgq, True)
        self.connect(self, self.avg, one_in_n, sink)

        self.win = number_window(self, parent, size=size,label=label)
        self.set_average(self.average)
	self.set_peak_hold(self.peak_hold)
	
class number_sink_c(gr.hier_block2, number_sink_base):
    def __init__(self, parent, unit='',base_value=0,minval=-100.0,maxval=100.0,factor=1.0,
                 decimal_places=10, ref_level=50, sample_rate=1,
                 number_rate=default_number_rate, average=False, avg_alpha=None,
                 label='', size=default_numbersink_size, peak_hold=False):

	gr.hier_block2.__init__(self, "number_sink_c",
				gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
				gr.io_signature(0, 0, 0))                    # Output signature

        number_sink_base.__init__(self, unit=unit, input_is_real=False, base_value=base_value,factor=factor,
                               minval=minval,maxval=maxval,decimal_places=decimal_places, ref_level=ref_level,
                               sample_rate=sample_rate, number_rate=number_rate,
                               average=average, avg_alpha=avg_alpha, label=label,
                               peak_hold=peak_hold)

        number_size=1                      
        one_in_n = gr.keep_one_in_n(gr.sizeof_gr_complex,
                                    max(1, int(sample_rate/number_rate)))
            
        self.avg = gr.single_pole_iir_filter_cc(1.0, number_size)
        sink = gr.message_sink(gr.sizeof_gr_complex , self.msgq, True)
        self.connect(self, self.avg, one_in_n, sink)

        self.win = number_window(self, parent, size=size,label=label)
        self.set_average(self.average)
	self.set_peak_hold(self.peak_hold)


# ------------------------------------------------------------------------

myDATA_EVENT = wx.NewEventType()
EVT_DATA_EVENT = wx.PyEventBinder (myDATA_EVENT, 0)


class DataEvent(wx.PyEvent):
    def __init__(self, data):
        wx.PyEvent.__init__(self)
        self.SetEventType (myDATA_EVENT)
        self.data = data

    def Clone (self): 
        self.__class__ (self.GetId())


class input_watcher (threading.Thread):
    def __init__ (self, msgq, number_size, event_receiver, **kwds):
        threading.Thread.__init__ (self, **kwds)
        self.setDaemon (1)
        self.msgq = msgq
        self.number_size = number_size
        self.event_receiver = event_receiver
        self.keep_running = True
        self.start ()

    def run (self):
        while (self.keep_running):
            msg = self.msgq.delete_head()  # blocking read of message queue
            itemsize = int(msg.arg1())
            nitems = int(msg.arg2())

            s = msg.to_string()            # get the body of the msg as a string

            # There may be more than one number in the message.
            # If so, we take only the last one
            if nitems > 1:
                start = itemsize * (nitems - 1)
                s = s[start:start+itemsize]

            complex_data = numpy.fromstring (s, numpy.float32)
            de = DataEvent (complex_data)
            wx.PostEvent (self.event_receiver, de)
            del de
    
#========================================================================================
class static_text_window (wx.StaticText): #plot.PlotCanvas):
    def __init__ (self, parent, numbersink,id = -1,label="number",
                  pos = wx.DefaultPosition, size = wx.DefaultSize,
                  style = wx.DEFAULT_FRAME_STYLE, name = ""):
        wx.StaticText.__init__(self, parent, id, label, pos, size, style, name)
        self.parent=parent
        self.label=label
        self.numbersink = numbersink
        self.peak_hold = False
        self.peak_vals = None
        self.build_popup_menu()
        self.Bind(wx.EVT_RIGHT_UP, self.on_right_click)

    def on_close_window (self, event):
        print "number_window:on_close_window"
        self.keep_running = False

    def set_peak_hold(self, enable):
        self.peak_hold = enable
        self.peak_vals = None

    def update_y_range (self):
        ymax = self.numbersink.ref_level
        ymin = self.numbersink.ref_level - self.numbersink.decimal_places * self.numbersink.y_divs
        self.y_range = self._axisInterval ('min', ymin, ymax)

    def on_average(self, evt):
        # print "on_average"
        self.numbersink.set_average(evt.IsChecked())

    def on_peak_hold(self, evt):
        # print "on_peak_hold"
        self.numbersink.set_peak_hold(evt.IsChecked())

    def on_show_gauge(self, evt):
        # print "on_show_gauge"
        self.numbersink.set_show_gauge(evt.IsChecked())
        print evt.IsChecked()

    def on_incr_ref_level(self, evt):
        # print "on_incr_ref_level"
        self.numbersink.set_ref_level(self.numbersink.ref_level
                                   + self.numbersink.decimal_places)

    def on_decr_ref_level(self, evt):
        # print "on_decr_ref_level"
        self.numbersink.set_ref_level(self.numbersink.ref_level
                                   - self.numbersink.decimal_places)

    def on_incr_decimal_places(self, evt):
        # print "on_incr_decimal_places"
        self.numbersink.set_decimal_places(self.numbersink.decimal_places+1)

    def on_decr_decimal_places(self, evt):
        # print "on_decr_decimal_places"
        self.numbersink.set_decimal_places(max(self.numbersink.decimal_places-1,0))