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: 3.10.5.1

from packaging.version import Version as 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 gnuradio import analog
from gnuradio import audio
from gnuradio import filter
from gnuradio.filter import firdes
from gnuradio import gr
from gnuradio.fft import window
import sys
import signal
from PyQt5 import Qt
from argparse import ArgumentParser
from gnuradio.eng_arg import eng_float, intx
from gnuradio import eng_notation
from gnuradio.qtgui import Range, RangeWidget
from PyQt5 import QtCore
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", catch_exceptions=True)
        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.samp_rate = samp_rate = 2560000
        self.frequency_mhz = frequency_mhz = 98.3
        self.channel_width_hertz = channel_width_hertz = 250000
        self.audio_sample_rate_hertz = audio_sample_rate_hertz = 48000

        ##################################################
        # Blocks
        ##################################################

        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, QtCore.Qt.Horizontal)
        self.top_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_dc_offset_mode(0, 0)
        self.rtlsdr_source_0.set_iq_balance_mode(0, 0)
        self.rtlsdr_source_0.set_gain_mode(False, 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=audio_sample_rate_hertz,
                decimation=channel_width_hertz,
                taps=[],
                fractional_bw=0)
        self.low_pass_filter_0 = filter.fir_filter_ccf(
            (int(samp_rate/channel_width_hertz)),
            firdes.low_pass(
                2,
                samp_rate,
                100000,
                10000,
                window.WIN_KAISER,
                6.76))
        self.audio_sink_0 = audio.sink(audio_sample_rate_hertz, '', 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.rational_resampler_xxx_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.audio_sink_0, 0))
        self.connect((self.rtlsdr_source_0, 0), (self.low_pass_filter_0, 0))


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

        event.accept()

    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, window.WIN_KAISER, 6.76))
        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.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

    def get_audio_sample_rate_hertz(self):
        return self.audio_sample_rate_hertz

    def set_audio_sample_rate_hertz(self, audio_sample_rate_hertz):
        self.audio_sample_rate_hertz = audio_sample_rate_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):
        tb.stop()
        tb.wait()

        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)

    qapp.exec_()

if __name__ == '__main__':
    main()