gnuradio-fm-radio-receiver/fm_radio.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

#
# SPDX-License-Identifier: GPL-3.0
#
# GNU Radio Python Flow Graph
# Title: FM Radio Receiver
# GNU Radio version: 3.8.1.0

from distutils.version import StrictVersion

if __name__ == '__main__':
    import ctypes
    import sys
    if sys.platform.startswith('linux'):
        try:
            x11 = ctypes.cdll.LoadLibrary('libX11.so')
            x11.XInitThreads()
        except:
            print("Warning: failed to XInitThreads()")

from PyQt5 import Qt
from gnuradio import qtgui
from gnuradio.filter import firdes
import sip
from gnuradio import analog
from gnuradio import audio
from gnuradio import blocks
from gnuradio import filter
from gnuradio import gr
import sys
import signal
from argparse import ArgumentParser
from gnuradio.eng_arg import eng_float, intx
from gnuradio import eng_notation
from gnuradio.qtgui import Range, RangeWidget
import osmosdr
import time
from gnuradio import qtgui

class fm_radio(gr.top_block, Qt.QWidget):

    def __init__(self):
        gr.top_block.__init__(self, "FM Radio Receiver")
        Qt.QWidget.__init__(self)
        self.setWindowTitle("FM Radio Receiver")
        qtgui.util.check_set_qss()
        try:
            self.setWindowIcon(Qt.QIcon.fromTheme('gnuradio-grc'))
        except:
            pass
        self.top_scroll_layout = Qt.QVBoxLayout()
        self.setLayout(self.top_scroll_layout)
        self.top_scroll = Qt.QScrollArea()
        self.top_scroll.setFrameStyle(Qt.QFrame.NoFrame)
        self.top_scroll_layout.addWidget(self.top_scroll)
        self.top_scroll.setWidgetResizable(True)
        self.top_widget = Qt.QWidget()
        self.top_scroll.setWidget(self.top_widget)
        self.top_layout = Qt.QVBoxLayout(self.top_widget)
        self.top_grid_layout = Qt.QGridLayout()
        self.top_layout.addLayout(self.top_grid_layout)

        self.settings = Qt.QSettings("GNU Radio", "fm_radio")

        try:
            if StrictVersion(Qt.qVersion()) < StrictVersion("5.0.0"):
                self.restoreGeometry(self.settings.value("geometry").toByteArray())
            else:
                self.restoreGeometry(self.settings.value("geometry"))
        except:
            pass

        ##################################################
        # Variables
        ##################################################
        self.volume = volume = 0.5
        self.samp_rate = samp_rate = 2560000
        self.frequency_mhz = frequency_mhz = 98.3
        self.channel_width_hertz = channel_width_hertz = 250000

        ##################################################
        # Blocks
        ##################################################
        self._volume_range = Range(0, 1, 0.05, 0.5, 200)
        self._volume_win = RangeWidget(self._volume_range, self.set_volume, 'Volume', "counter_slider", float)
        self.top_grid_layout.addWidget(self._volume_win)
        self._frequency_mhz_range = Range(87.5, 108, 0.1, 98.3, 200)
        self._frequency_mhz_win = RangeWidget(self._frequency_mhz_range, self.set_frequency_mhz, 'Frequency MHz', "counter_slider", float)
        self.top_grid_layout.addWidget(self._frequency_mhz_win)
        self.rtlsdr_source_0 = osmosdr.source(
            args="numchan=" + str(1) + " " + ""
        )
        self.rtlsdr_source_0.set_time_unknown_pps(osmosdr.time_spec_t())
        self.rtlsdr_source_0.set_sample_rate(samp_rate)
        self.rtlsdr_source_0.set_center_freq(frequency_mhz*1e6, 0)
        self.rtlsdr_source_0.set_freq_corr(0, 0)
        self.rtlsdr_source_0.set_gain(20, 0)
        self.rtlsdr_source_0.set_if_gain(20, 0)
        self.rtlsdr_source_0.set_bb_gain(20, 0)
        self.rtlsdr_source_0.set_antenna('', 0)
        self.rtlsdr_source_0.set_bandwidth(0, 0)
        self.rational_resampler_xxx_0 = filter.rational_resampler_fff(
                interpolation=48000,
                decimation=channel_width_hertz,
                taps=None,
                fractional_bw=None)
        self.qtgui_waterfall_sink_x_0 = qtgui.waterfall_sink_c(
            1048, #size
            firdes.WIN_BLACKMAN_hARRIS, #wintype
            frequency_mhz*1e6, #fc
            samp_rate, #bw
            "", #name
            1 #number of inputs
        )
        self.qtgui_waterfall_sink_x_0.set_update_time(0.10)
        self.qtgui_waterfall_sink_x_0.enable_grid(False)
        self.qtgui_waterfall_sink_x_0.enable_axis_labels(True)



        labels = ['', '', '', '', '',
                  '', '', '', '', '']
        colors = [0, 0, 0, 0, 0,
                  0, 0, 0, 0, 0]
        alphas = [1.0, 1.0, 1.0, 1.0, 1.0,
                  1.0, 1.0, 1.0, 1.0, 1.0]

        for i in range(1):
            if len(labels[i]) == 0:
                self.qtgui_waterfall_sink_x_0.set_line_label(i, "Data {0}".format(i))
            else:
                self.qtgui_waterfall_sink_x_0.set_line_label(i, labels[i])
            self.qtgui_waterfall_sink_x_0.set_color_map(i, colors[i])
            self.qtgui_waterfall_sink_x_0.set_line_alpha(i, alphas[i])

        self.qtgui_waterfall_sink_x_0.set_intensity_range(-140, 10)

        self._qtgui_waterfall_sink_x_0_win = sip.wrapinstance(self.qtgui_waterfall_sink_x_0.pyqwidget(), Qt.QWidget)
        self.top_grid_layout.addWidget(self._qtgui_waterfall_sink_x_0_win)
        self.qtgui_freq_sink_x_0 = qtgui.freq_sink_f(
            1024, #size
            firdes.WIN_BLACKMAN_hARRIS, #wintype
            0, #fc
            channel_width_hertz, #bw
            "Demod Out", #name
            1
        )
        self.qtgui_freq_sink_x_0.set_update_time(0.10)
        self.qtgui_freq_sink_x_0.set_y_axis(-140, 10)
        self.qtgui_freq_sink_x_0.set_y_label('Relative Gain', 'dB')
        self.qtgui_freq_sink_x_0.set_trigger_mode(qtgui.TRIG_MODE_FREE, 0.0, 0, "")
        self.qtgui_freq_sink_x_0.enable_autoscale(False)
        self.qtgui_freq_sink_x_0.enable_grid(False)
        self.qtgui_freq_sink_x_0.set_fft_average(1.0)
        self.qtgui_freq_sink_x_0.enable_axis_labels(True)
        self.qtgui_freq_sink_x_0.enable_control_panel(False)

        self.qtgui_freq_sink_x_0.disable_legend()

        self.qtgui_freq_sink_x_0.set_plot_pos_half(not True)

        labels = ['', '', '', '', '',
            '', '', '', '', '']
        widths = [1, 1, 1, 1, 1,
            1, 1, 1, 1, 1]
        colors = ["blue", "red", "green", "black", "cyan",
            "magenta", "yellow", "dark red", "dark green", "dark blue"]
        alphas = [1.0, 1.0, 1.0, 1.0, 1.0,
            1.0, 1.0, 1.0, 1.0, 1.0]

        for i in range(1):
            if len(labels[i]) == 0:
                self.qtgui_freq_sink_x_0.set_line_label(i, "Data {0}".format(i))
            else:
                self.qtgui_freq_sink_x_0.set_line_label(i, labels[i])
            self.qtgui_freq_sink_x_0.set_line_width(i, widths[i])
            self.qtgui_freq_sink_x_0.set_line_color(i, colors[i])
            self.qtgui_freq_sink_x_0.set_line_alpha(i, alphas[i])

        self._qtgui_freq_sink_x_0_win = sip.wrapinstance(self.qtgui_freq_sink_x_0.pyqwidget(), Qt.QWidget)
        self.top_grid_layout.addWidget(self._qtgui_freq_sink_x_0_win)
        self.low_pass_filter_0 = filter.fir_filter_ccf(
            int(samp_rate/channel_width_hertz),
            firdes.low_pass(
                2,
                samp_rate,
                100000,
                10000,
                firdes.WIN_KAISER,
                6.76))
        self.blocks_multiply_const_vxx_0 = blocks.multiply_const_ff(volume)
        self.audio_sink_0 = audio.sink(48000, '', True)
        self.analog_wfm_rcv_0 = analog.wfm_rcv(
        	quad_rate=channel_width_hertz,
        	audio_decimation=1,
        )



        ##################################################
        # Connections
        ##################################################
        self.connect((self.analog_wfm_rcv_0, 0), (self.qtgui_freq_sink_x_0, 0))
        self.connect((self.analog_wfm_rcv_0, 0), (self.rational_resampler_xxx_0, 0))
        self.connect((self.blocks_multiply_const_vxx_0, 0), (self.audio_sink_0, 0))
        self.connect((self.low_pass_filter_0, 0), (self.analog_wfm_rcv_0, 0))
        self.connect((self.rational_resampler_xxx_0, 0), (self.blocks_multiply_const_vxx_0, 0))
        self.connect((self.rtlsdr_source_0, 0), (self.low_pass_filter_0, 0))
        self.connect((self.rtlsdr_source_0, 0), (self.qtgui_waterfall_sink_x_0, 0))

    def closeEvent(self, event):
        self.settings = Qt.QSettings("GNU Radio", "fm_radio")
        self.settings.setValue("geometry", self.saveGeometry())
        event.accept()

    def get_volume(self):
        return self.volume

    def set_volume(self, volume):
        self.volume = volume
        self.blocks_multiply_const_vxx_0.set_k(self.volume)

    def get_samp_rate(self):
        return self.samp_rate

    def set_samp_rate(self, samp_rate):
        self.samp_rate = samp_rate
        self.low_pass_filter_0.set_taps(firdes.low_pass(2, self.samp_rate, 100000, 10000, firdes.WIN_KAISER, 6.76))
        self.qtgui_waterfall_sink_x_0.set_frequency_range(self.frequency_mhz*1e6, self.samp_rate)
        self.rtlsdr_source_0.set_sample_rate(self.samp_rate)

    def get_frequency_mhz(self):
        return self.frequency_mhz

    def set_frequency_mhz(self, frequency_mhz):
        self.frequency_mhz = frequency_mhz
        self.qtgui_waterfall_sink_x_0.set_frequency_range(self.frequency_mhz*1e6, self.samp_rate)
        self.rtlsdr_source_0.set_center_freq(self.frequency_mhz*1e6, 0)

    def get_channel_width_hertz(self):
        return self.channel_width_hertz

    def set_channel_width_hertz(self, channel_width_hertz):
        self.channel_width_hertz = channel_width_hertz
        self.qtgui_freq_sink_x_0.set_frequency_range(0, self.channel_width_hertz)



def main(top_block_cls=fm_radio, options=None):

    if StrictVersion("4.5.0") <= StrictVersion(Qt.qVersion()) < StrictVersion("5.0.0"):
        style = gr.prefs().get_string('qtgui', 'style', 'raster')
        Qt.QApplication.setGraphicsSystem(style)
    qapp = Qt.QApplication(sys.argv)

    tb = top_block_cls()
    tb.start()
    tb.show()

    def sig_handler(sig=None, frame=None):
        Qt.QApplication.quit()

    signal.signal(signal.SIGINT, sig_handler)
    signal.signal(signal.SIGTERM, sig_handler)

    timer = Qt.QTimer()
    timer.start(500)
    timer.timeout.connect(lambda: None)

    def quitting():
        tb.stop()
        tb.wait()
    qapp.aboutToQuit.connect(quitting)
    qapp.exec_()


if __name__ == '__main__':
    main()