openwebrx-clone/csdr.py

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"""
OpenWebRX csdr plugin: do the signal processing with csdr
This file is part of OpenWebRX,
an open-source SDR receiver software with a web UI.
Copyright (c) 2013-2015 by Andras Retzler <randras@sdr.hu>
2019-11-12 12:43:39 +00:00
Copyright (c) 2019 by Jakob Ketterl <dd5jfk@darc.de>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
import subprocess
import os
import signal
import threading
from functools import partial
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from owrx.kiss import KissClient, DirewolfConfig
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from owrx.wsjt import Ft8Chopper, WsprChopper, Jt9Chopper, Jt65Chopper, Ft4Chopper
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import logging
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logger = logging.getLogger(__name__)
class output(object):
def send_output(self, t, read_fn):
if not self.supports_type(t):
# TODO rewrite the output mechanism in a way that avoids producing unnecessary data
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logger.warning("dumping output of type %s since it is not supported.", t)
threading.Thread(target=self.pump(read_fn, lambda x: None)).start()
return
self.receive_output(t, read_fn)
def receive_output(self, t, read_fn):
pass
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def pump(self, read, write):
def copy():
run = True
while run:
data = read()
if data is None or (isinstance(data, bytes) and len(data) == 0):
run = False
else:
write(data)
return copy
def supports_type(self, t):
return True
class dsp(object):
def __init__(self, output):
self.samp_rate = 250000
self.output_rate = 11025
self.fft_size = 1024
self.fft_fps = 5
self.offset_freq = 0
self.low_cut = -4000
self.high_cut = 4000
self.bpf_transition_bw = 320 # Hz, and this is a constant
self.ddc_transition_bw_rate = 0.15 # of the IF sample rate
self.running = False
self.secondary_processes_running = False
self.audio_compression = "none"
self.fft_compression = "none"
self.demodulator = "nfm"
self.name = "csdr"
self.base_bufsize = 512
self.nc_port = None
self.csdr_dynamic_bufsize = False
self.csdr_print_bufsizes = False
self.csdr_through = False
self.squelch_level = 0
self.fft_averages = 50
self.iqtee = False
self.iqtee2 = False
self.secondary_demodulator = None
self.secondary_fft_size = 1024
self.secondary_process_fft = None
self.secondary_process_demod = None
self.pipe_names = [
"bpf_pipe",
"shift_pipe",
"squelch_pipe",
"smeter_pipe",
"meta_pipe",
"iqtee_pipe",
"iqtee2_pipe",
"dmr_control_pipe",
]
self.secondary_pipe_names = ["secondary_shift_pipe"]
self.secondary_offset_freq = 1000
self.unvoiced_quality = 1
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self.modification_lock = threading.Lock()
self.output = output
self.temporary_directory = "/tmp"
self.is_service = False
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self.direwolf_config = None
self.direwolf_port = None
def set_service(self, flag=True):
self.is_service = flag
def set_temporary_directory(self, what):
self.temporary_directory = what
def chain(self, which):
chain = ["nc -v 127.0.0.1 {nc_port}"]
if self.csdr_dynamic_bufsize:
chain += ["csdr setbuf {start_bufsize}"]
if self.csdr_through:
chain += ["csdr through"]
if which == "fft":
chain += [
"csdr fft_cc {fft_size} {fft_block_size}",
"csdr logpower_cf -70"
if self.fft_averages == 0
else "csdr logaveragepower_cf -70 {fft_size} {fft_averages}",
"csdr fft_exchange_sides_ff {fft_size}",
]
if self.fft_compression == "adpcm":
chain += ["csdr compress_fft_adpcm_f_u8 {fft_size}"]
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return chain
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chain += ["csdr shift_addition_cc --fifo {shift_pipe}"]
if self.decimation > 1:
chain += ["csdr fir_decimate_cc {decimation} {ddc_transition_bw} HAMMING"]
chain += ["csdr bandpass_fir_fft_cc --fifo {bpf_pipe} {bpf_transition_bw} HAMMING"]
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if self.output.supports_type("smeter"):
chain += [
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"csdr squelch_and_smeter_cc --fifo {squelch_pipe} --outfifo {smeter_pipe} 5 {smeter_report_every}"
]
if self.secondary_demodulator:
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if self.output.supports_type("secondary_fft"):
chain += ["csdr tee {iqtee_pipe}"]
chain += ["csdr tee {iqtee2_pipe}"]
# early exit if we don't want audio
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if not self.output.supports_type("audio"):
return chain
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# safe some cpu cycles... no need to decimate if decimation factor is 1
last_decimation_block = (
["csdr fractional_decimator_ff {last_decimation}"] if self.last_decimation != 1.0 else []
)
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if which == "nfm":
chain += ["csdr fmdemod_quadri_cf", "csdr limit_ff"]
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chain += last_decimation_block
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chain += ["csdr deemphasis_nfm_ff {audio_rate}"]
if self.get_audio_rate() != self.get_output_rate():
chain += [
"sox -t raw -r {audio_rate} -e floating-point -b 32 -c 1 --buffer 32 - -t raw -r {output_rate} -e signed-integer -b 16 -c 1 - "
]
else:
chain += ["csdr convert_f_s16"]
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elif self.isDigitalVoice(which):
chain += ["csdr fmdemod_quadri_cf", "dc_block "]
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chain += last_decimation_block
# dsd modes
if which in ["dstar", "nxdn"]:
chain += ["csdr limit_ff", "csdr convert_f_s16"]
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if which == "dstar":
chain += ["dsd -fd -i - -o - -u {unvoiced_quality} -g -1 "]
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elif which == "nxdn":
chain += ["dsd -fi -i - -o - -u {unvoiced_quality} -g -1 "]
chain += ["CSDR_FIXED_BUFSIZE=32 csdr convert_s16_f"]
max_gain = 5
# digiham modes
else:
chain += ["rrc_filter", "gfsk_demodulator"]
if which == "dmr":
chain += [
"dmr_decoder --fifo {meta_pipe} --control-fifo {dmr_control_pipe}",
"mbe_synthesizer -f -u {unvoiced_quality}",
]
elif which == "ysf":
chain += ["ysf_decoder --fifo {meta_pipe}", "mbe_synthesizer -y -f -u {unvoiced_quality}"]
max_gain = 0.0005
chain += [
"digitalvoice_filter -f",
"CSDR_FIXED_BUFSIZE=32 csdr agc_ff 160000 0.8 1 0.0000001 {max_gain}".format(max_gain=max_gain),
"sox -t raw -r 8000 -e floating-point -b 32 -c 1 --buffer 32 - -t raw -r {output_rate} -e signed-integer -b 16 -c 1 - ",
]
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elif which == "am":
chain += ["csdr amdemod_cf", "csdr fastdcblock_ff"]
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chain += last_decimation_block
chain += ["csdr agc_ff", "csdr limit_ff", "csdr convert_f_s16"]
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elif which == "ssb":
chain += ["csdr realpart_cf"]
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chain += last_decimation_block
chain += ["csdr agc_ff", "csdr limit_ff"]
# fixed sample rate necessary for the wsjt-x tools. fix with sox...
if self.get_audio_rate() != self.get_output_rate():
chain += [
"sox -t raw -r {audio_rate} -e floating-point -b 32 -c 1 --buffer 32 - -t raw -r {output_rate} -e signed-integer -b 16 -c 1 - "
]
else:
chain += ["csdr convert_f_s16"]
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if self.audio_compression == "adpcm":
chain += ["csdr encode_ima_adpcm_i16_u8"]
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return chain
def secondary_chain(self, which):
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chain = ["cat {input_pipe}"]
if which == "fft":
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chain += [
"csdr realpart_cf",
"csdr fft_fc {secondary_fft_input_size} {secondary_fft_block_size}",
"csdr logpower_cf -70",
]
if self.fft_compression == "adpcm":
chain += ["csdr compress_fft_adpcm_f_u8 {secondary_fft_size}"]
return chain
elif which == "bpsk31":
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return chain + [
"csdr shift_addition_cc --fifo {secondary_shift_pipe}",
"csdr bandpass_fir_fft_cc -{secondary_bpf_cutoff} {secondary_bpf_cutoff} {secondary_bpf_cutoff}",
"csdr simple_agc_cc 0.001 0.5",
"csdr timing_recovery_cc GARDNER {secondary_samples_per_bits} 0.5 2 --add_q",
"CSDR_FIXED_BUFSIZE=1 csdr dbpsk_decoder_c_u8",
"CSDR_FIXED_BUFSIZE=1 csdr psk31_varicode_decoder_u8_u8",
]
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elif self.isWsjtMode(which):
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chain += ["csdr realpart_cf"]
if self.last_decimation != 1.0:
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chain += ["csdr fractional_decimator_ff {last_decimation}"]
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return chain + ["csdr limit_ff", "csdr convert_f_s16"]
elif which == "packet":
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chain += ["csdr fmdemod_quadri_cf"]
if self.last_decimation != 1.0:
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chain += ["csdr fractional_decimator_ff {last_decimation}"]
return chain + ["csdr convert_f_s16", "direwolf -c {direwolf_config} -r {audio_rate} -t 0 -q d -q h - 1>&2"]
def set_secondary_demodulator(self, what):
if self.get_secondary_demodulator() == what:
return
self.secondary_demodulator = what
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self.calculate_decimation()
self.restart()
def secondary_fft_block_size(self):
return (self.samp_rate / self.decimation) / (
self.fft_fps * 2
) # *2 is there because we do FFT on real signal here
def secondary_decimation(self):
return 1 # currently unused
def secondary_bpf_cutoff(self):
if self.secondary_demodulator == "bpsk31":
return 31.25 / self.if_samp_rate()
return 0
def secondary_bpf_transition_bw(self):
if self.secondary_demodulator == "bpsk31":
return 31.25 / self.if_samp_rate()
return 0
def secondary_samples_per_bits(self):
if self.secondary_demodulator == "bpsk31":
return int(round(self.if_samp_rate() / 31.25)) & ~3
return 0
def secondary_bw(self):
if self.secondary_demodulator == "bpsk31":
return 31.25
def start_secondary_demodulator(self):
if not self.secondary_demodulator:
return
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logger.debug("starting secondary demodulator from IF input sampled at %d" % self.if_samp_rate())
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secondary_command_demod = " | ".join(self.secondary_chain(self.secondary_demodulator))
self.try_create_pipes(self.secondary_pipe_names, secondary_command_demod)
self.try_create_configs(secondary_command_demod)
secondary_command_demod = secondary_command_demod.format(
input_pipe=self.iqtee2_pipe,
secondary_shift_pipe=self.secondary_shift_pipe,
secondary_decimation=self.secondary_decimation(),
secondary_samples_per_bits=self.secondary_samples_per_bits(),
secondary_bpf_cutoff=self.secondary_bpf_cutoff(),
secondary_bpf_transition_bw=self.secondary_bpf_transition_bw(),
if_samp_rate=self.if_samp_rate(),
last_decimation=self.last_decimation,
audio_rate=self.get_audio_rate(),
direwolf_config=self.direwolf_config,
)
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logger.debug("secondary command (demod) = %s", secondary_command_demod)
my_env = os.environ.copy()
# if self.csdr_dynamic_bufsize: my_env["CSDR_DYNAMIC_BUFSIZE_ON"]="1";
if self.csdr_print_bufsizes:
my_env["CSDR_PRINT_BUFSIZES"] = "1"
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if self.output.supports_type("secondary_fft"):
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secondary_command_fft = " | ".join(self.secondary_chain("fft"))
secondary_command_fft = secondary_command_fft.format(
input_pipe=self.iqtee_pipe,
secondary_fft_input_size=self.secondary_fft_size,
secondary_fft_size=self.secondary_fft_size,
secondary_fft_block_size=self.secondary_fft_block_size(),
)
logger.debug("secondary command (fft) = %s", secondary_command_fft)
self.secondary_process_fft = subprocess.Popen(
secondary_command_fft, stdout=subprocess.PIPE, shell=True, preexec_fn=os.setpgrp, env=my_env
)
self.output.send_output(
"secondary_fft",
partial(self.secondary_process_fft.stdout.read, int(self.get_secondary_fft_bytes_to_read())),
)
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# direwolf does not provide any meaningful data on stdout
# more specifically, it doesn't provide any data. if however, for any strange reason, it would start to do so,
# it would block if not read. by piping it to devnull, we avoid a potential pitfall here.
secondary_output = subprocess.DEVNULL if self.isPacket() else subprocess.PIPE
self.secondary_process_demod = subprocess.Popen(
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secondary_command_demod, stdout=secondary_output, shell=True, preexec_fn=os.setpgrp, env=my_env
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)
self.secondary_processes_running = True
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if self.isWsjtMode():
smd = self.get_secondary_demodulator()
if smd == "ft8":
chopper = Ft8Chopper(self.secondary_process_demod.stdout)
elif smd == "wspr":
chopper = WsprChopper(self.secondary_process_demod.stdout)
elif smd == "jt65":
chopper = Jt65Chopper(self.secondary_process_demod.stdout)
elif smd == "jt9":
chopper = Jt9Chopper(self.secondary_process_demod.stdout)
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elif smd == "ft4":
chopper = Ft4Chopper(self.secondary_process_demod.stdout)
chopper.start()
self.output.send_output("wsjt_demod", chopper.read)
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elif self.isPacket():
# we best get the ax25 packets from the kiss socket
kiss = KissClient(self.direwolf_port)
self.output.send_output("packet_demod", kiss.read)
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else:
self.output.send_output("secondary_demod", partial(self.secondary_process_demod.stdout.read, 1))
# open control pipes for csdr and send initialization data
if self.secondary_shift_pipe != None: # TODO digimodes
self.secondary_shift_pipe_file = open(self.secondary_shift_pipe, "w") # TODO digimodes
self.set_secondary_offset_freq(self.secondary_offset_freq) # TODO digimodes
def set_secondary_offset_freq(self, value):
self.secondary_offset_freq = value
if self.secondary_processes_running and hasattr(self, "secondary_shift_pipe_file"):
self.secondary_shift_pipe_file.write("%g\n" % (-float(self.secondary_offset_freq) / self.if_samp_rate()))
self.secondary_shift_pipe_file.flush()
def stop_secondary_demodulator(self):
if self.secondary_processes_running == False:
return
self.try_delete_pipes(self.secondary_pipe_names)
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self.try_delete_configs()
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if self.secondary_process_fft:
try:
os.killpg(os.getpgid(self.secondary_process_fft.pid), signal.SIGTERM)
except ProcessLookupError:
# been killed by something else, ignore
pass
if self.secondary_process_demod:
try:
os.killpg(os.getpgid(self.secondary_process_demod.pid), signal.SIGTERM)
except ProcessLookupError:
# been killed by something else, ignore
pass
self.secondary_processes_running = False
def get_secondary_demodulator(self):
return self.secondary_demodulator
def set_secondary_fft_size(self, secondary_fft_size):
# to change this, restart is required
self.secondary_fft_size = secondary_fft_size
def set_audio_compression(self, what):
self.audio_compression = what
def get_audio_bytes_to_read(self):
# desired latency: 5ms
# uncompressed audio has 16 bits = 2 bytes per sample
base = self.output_rate * 0.005 * 2
# adpcm compresses the bitstream by 4
if self.audio_compression == "adpcm":
base = base / 4
return int(base)
def set_fft_compression(self, what):
self.fft_compression = what
def get_fft_bytes_to_read(self):
if self.fft_compression == "none":
return self.fft_size * 4
if self.fft_compression == "adpcm":
return int((self.fft_size / 2) + (10 / 2))
def get_secondary_fft_bytes_to_read(self):
if self.fft_compression == "none":
return self.secondary_fft_size * 4
if self.fft_compression == "adpcm":
return (self.secondary_fft_size / 2) + (10 / 2)
def set_samp_rate(self, samp_rate):
self.samp_rate = samp_rate
self.calculate_decimation()
if self.running:
self.restart()
def calculate_decimation(self):
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(self.decimation, self.last_decimation, _) = self.get_decimation(self.samp_rate, self.get_audio_rate())
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def get_decimation(self, input_rate, output_rate):
decimation = 1
while input_rate / (decimation + 1) >= output_rate:
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decimation += 1
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fraction = float(input_rate / decimation) / output_rate
intermediate_rate = input_rate / decimation
return (decimation, fraction, intermediate_rate)
def if_samp_rate(self):
return self.samp_rate / self.decimation
def get_name(self):
return self.name
def get_output_rate(self):
return self.output_rate
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def get_audio_rate(self):
if self.isDigitalVoice() or self.isPacket():
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return 48000
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elif self.isWsjtMode():
return 12000
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return self.get_output_rate()
def isDigitalVoice(self, demodulator=None):
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if demodulator is None:
demodulator = self.get_demodulator()
return demodulator in ["dmr", "dstar", "nxdn", "ysf"]
def isWsjtMode(self, demodulator=None):
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if demodulator is None:
demodulator = self.get_secondary_demodulator()
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return demodulator in ["ft8", "wspr", "jt65", "jt9", "ft4"]
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def isPacket(self, demodulator=None):
if demodulator is None:
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demodulator = self.get_secondary_demodulator()
return demodulator == "packet"
def set_output_rate(self, output_rate):
if self.output_rate == output_rate:
return
self.output_rate = output_rate
self.calculate_decimation()
self.restart()
def set_demodulator(self, demodulator):
if self.demodulator == demodulator:
return
self.demodulator = demodulator
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self.calculate_decimation()
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self.restart()
def get_demodulator(self):
return self.demodulator
def set_fft_size(self, fft_size):
self.fft_size = fft_size
self.restart()
def set_fft_fps(self, fft_fps):
self.fft_fps = fft_fps
self.restart()
def set_fft_averages(self, fft_averages):
self.fft_averages = fft_averages
self.restart()
def fft_block_size(self):
if self.fft_averages == 0:
return self.samp_rate / self.fft_fps
else:
return self.samp_rate / self.fft_fps / self.fft_averages
def set_offset_freq(self, offset_freq):
self.offset_freq = offset_freq
if self.running:
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self.modification_lock.acquire()
self.shift_pipe_file.write("%g\n" % (-float(self.offset_freq) / self.samp_rate))
self.shift_pipe_file.flush()
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self.modification_lock.release()
def set_bpf(self, low_cut, high_cut):
self.low_cut = low_cut
self.high_cut = high_cut
if self.running:
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self.modification_lock.acquire()
self.bpf_pipe_file.write(
"%g %g\n" % (float(self.low_cut) / self.if_samp_rate(), float(self.high_cut) / self.if_samp_rate())
)
self.bpf_pipe_file.flush()
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self.modification_lock.release()
def get_bpf(self):
return [self.low_cut, self.high_cut]
def set_squelch_level(self, squelch_level):
self.squelch_level = squelch_level
# no squelch required on digital voice modes
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actual_squelch = 0 if self.isDigitalVoice() or self.isPacket() else self.squelch_level
if self.running:
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self.modification_lock.acquire()
self.squelch_pipe_file.write("%g\n" % (float(actual_squelch)))
self.squelch_pipe_file.flush()
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self.modification_lock.release()
def set_unvoiced_quality(self, q):
self.unvoiced_quality = q
self.restart()
def get_unvoiced_quality(self):
return self.unvoiced_quality
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def set_dmr_filter(self, filter):
if self.dmr_control_pipe_file:
self.dmr_control_pipe_file.write("{0}\n".format(filter))
self.dmr_control_pipe_file.flush()
def mkfifo(self, path):
try:
os.unlink(path)
except:
pass
os.mkfifo(path)
def ddc_transition_bw(self):
return self.ddc_transition_bw_rate * (self.if_samp_rate() / float(self.samp_rate))
def try_create_pipes(self, pipe_names, command_base):
for pipe_name in pipe_names:
if "{" + pipe_name + "}" in command_base:
setattr(self, pipe_name, self.pipe_base_path + pipe_name)
self.mkfifo(getattr(self, pipe_name))
else:
setattr(self, pipe_name, None)
def try_delete_pipes(self, pipe_names):
for pipe_name in pipe_names:
pipe_path = getattr(self, pipe_name, None)
if pipe_path:
try:
os.unlink(pipe_path)
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except FileNotFoundError:
# it seems like we keep calling this twice. no idea why, but we don't need the resulting error.
pass
except Exception:
logger.exception("try_delete_pipes()")
def try_create_configs(self, command):
if "{direwolf_config}" in command:
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self.direwolf_config = "{tmp_dir}/openwebrx_direwolf_{myid}.conf".format(
tmp_dir=self.temporary_directory, myid=id(self)
)
self.direwolf_port = KissClient.getFreePort()
file = open(self.direwolf_config, "w")
file.write(DirewolfConfig().getConfig(self.direwolf_port, self.is_service))
file.close()
else:
self.direwolf_config = None
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self.direwolf_port = None
def try_delete_configs(self):
if self.direwolf_config:
try:
os.unlink(self.direwolf_config)
except FileNotFoundError:
# result suits our expectations. fine :)
pass
except Exception:
logger.exception("try_delete_configs()")
self.direwolf_config = None
def start(self):
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self.modification_lock.acquire()
if self.running:
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self.modification_lock.release()
return
self.running = True
command_base = " | ".join(self.chain(self.demodulator))
# create control pipes for csdr
self.pipe_base_path = "{tmp_dir}/openwebrx_pipe_{myid}_".format(tmp_dir=self.temporary_directory, myid=id(self))
self.try_create_pipes(self.pipe_names, command_base)
# run the command
command = command_base.format(
bpf_pipe=self.bpf_pipe,
shift_pipe=self.shift_pipe,
decimation=self.decimation,
last_decimation=self.last_decimation,
fft_size=self.fft_size,
fft_block_size=self.fft_block_size(),
fft_averages=self.fft_averages,
bpf_transition_bw=float(self.bpf_transition_bw) / self.if_samp_rate(),
ddc_transition_bw=self.ddc_transition_bw(),
flowcontrol=int(self.samp_rate * 2),
start_bufsize=self.base_bufsize * self.decimation,
nc_port=self.nc_port,
squelch_pipe=self.squelch_pipe,
smeter_pipe=self.smeter_pipe,
meta_pipe=self.meta_pipe,
iqtee_pipe=self.iqtee_pipe,
iqtee2_pipe=self.iqtee2_pipe,
output_rate=self.get_output_rate(),
smeter_report_every=int(self.if_samp_rate() / 6000),
unvoiced_quality=self.get_unvoiced_quality(),
dmr_control_pipe=self.dmr_control_pipe,
audio_rate=self.get_audio_rate(),
)
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logger.debug("Command = %s", command)
my_env = os.environ.copy()
if self.csdr_dynamic_bufsize:
my_env["CSDR_DYNAMIC_BUFSIZE_ON"] = "1"
if self.csdr_print_bufsizes:
my_env["CSDR_PRINT_BUFSIZES"] = "1"
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out = subprocess.PIPE if self.output.supports_type("audio") else subprocess.DEVNULL
self.process = subprocess.Popen(command, stdout=out, shell=True, preexec_fn=os.setpgrp, env=my_env)
def watch_thread():
rc = self.process.wait()
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logger.debug("dsp thread ended with rc=%d", rc)
if rc == 0 and self.running and not self.modification_lock.locked():
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logger.debug("restarting since rc = 0, self.running = true, and no modification")
self.restart()
threading.Thread(target=watch_thread).start()
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if self.output.supports_type("audio"):
self.output.send_output(
"audio",
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partial(
self.process.stdout.read,
self.get_fft_bytes_to_read() if self.demodulator == "fft" else self.get_audio_bytes_to_read(),
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),
)
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# open control pipes for csdr
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if self.bpf_pipe:
self.bpf_pipe_file = open(self.bpf_pipe, "w")
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if self.shift_pipe:
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self.shift_pipe_file = open(self.shift_pipe, "w")
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if self.squelch_pipe:
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self.squelch_pipe_file = open(self.squelch_pipe, "w")
self.start_secondary_demodulator()
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self.modification_lock.release()
# send initial config through the pipes
if self.squelch_pipe:
self.set_squelch_level(self.squelch_level)
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if self.shift_pipe:
self.set_offset_freq(self.offset_freq)
if self.bpf_pipe:
self.set_bpf(self.low_cut, self.high_cut)
if self.smeter_pipe:
self.smeter_pipe_file = open(self.smeter_pipe, "r")
def read_smeter():
raw = self.smeter_pipe_file.readline()
if len(raw) == 0:
return None
else:
return float(raw.rstrip("\n"))
self.output.send_output("smeter", read_smeter)
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if self.meta_pipe != None:
# TODO make digiham output unicode and then change this here
self.meta_pipe_file = open(self.meta_pipe, "r", encoding="cp437")
def read_meta():
raw = self.meta_pipe_file.readline()
if len(raw) == 0:
return None
else:
return raw.rstrip("\n")
self.output.send_output("meta", read_meta)
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if self.dmr_control_pipe:
self.dmr_control_pipe_file = open(self.dmr_control_pipe, "w")
def stop(self):
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self.modification_lock.acquire()
self.running = False
if hasattr(self, "process"):
try:
os.killpg(os.getpgid(self.process.pid), signal.SIGTERM)
except ProcessLookupError:
# been killed by something else, ignore
pass
self.stop_secondary_demodulator()
self.try_delete_pipes(self.pipe_names)
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self.modification_lock.release()
def restart(self):
if not self.running:
return
self.stop()
self.start()
def __del__(self):
self.stop()
del self.process