openwebrx-clone/plugins/dsp/csdr/plugin.py

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"""
OpenWebRX csdr plugin: do the signal processing with csdr
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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>
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/>.
"""
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import subprocess
import time
import os
import code
import signal
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import fcntl
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class dsp_plugin:
def __init__(self):
self.samp_rate = 250000
self.output_rate = 11025 #this is default, and cannot be set at the moment
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self.fft_size = 1024
self.fft_fps = 5
self.offset_freq = 0
self.low_cut = -4000
self.high_cut = 4000
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self.bpf_transition_bw = 320 #Hz, and this is a constant
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self.ddc_transition_bw_rate = 0.15 # of the IF sample rate
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self.running = False
self.audio_compression = "none"
self.fft_compression = "none"
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self.demodulator = "nfm"
self.name = "csdr"
self.format_conversion = "csdr convert_u8_f"
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self.base_bufsize = 512
self.nc_port = 4951
self.csdr_dynamic_bufsize = False
self.csdr_print_bufsizes = False
self.csdr_through = False
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self.squelch_level = 0
self.fft_averages = 50
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def chain(self,which):
any_chain_base="ncat -v 127.0.0.1 {nc_port} | "
if self.csdr_dynamic_bufsize: any_chain_base+="csdr setbuf {start_bufsize} | "
if self.csdr_through: any_chain_base+="csdr through | "
any_chain_base+=self.format_conversion+(" | " if self.format_conversion!="" else "") ##"csdr flowcontrol {flowcontrol} auto 1.5 10 | "
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if which == "fft":
if self.fft_averages > 1:
fft_chain_base = any_chain_base+"csdr fft_cc {fft_size} {fft_block_size} | csdr logaveragepower_cf -70 {fft_size} {fft_averages} | csdr fft_exchange_sides_ff {fft_size}"
else:
fft_chain_base = any_chain_base+"csdr fft_cc {fft_size} {fft_block_size} | csdr logpower_cf -70 | csdr fft_exchange_sides_ff {fft_size}"
if self.fft_compression=="adpcm":
return fft_chain_base+" | csdr compress_fft_adpcm_f_u8 {fft_size}"
else:
return fft_chain_base
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chain_begin=any_chain_base+"csdr shift_addition_cc --fifo {shift_pipe} | csdr fir_decimate_cc {decimation} {ddc_transition_bw} HAMMING | csdr bandpass_fir_fft_cc --fifo {bpf_pipe} {bpf_transition_bw} HAMMING | csdr squelch_and_smeter_cc --fifo {squelch_pipe} --outfifo {smeter_pipe} 5 1 | "
chain_end = ""
if self.audio_compression=="adpcm":
chain_end = " | csdr encode_ima_adpcm_i16_u8"
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if which == "nfm": return chain_begin + "csdr fmdemod_quadri_cf | csdr limit_ff | csdr fractional_decimator_ff {last_decimation} | csdr deemphasis_nfm_ff 11025 | csdr fastagc_ff 1024 | csdr convert_f_s16"+chain_end
elif which == "am": return chain_begin + "csdr amdemod_cf | csdr fastdcblock_ff | csdr fractional_decimator_ff {last_decimation} | csdr agc_ff | csdr limit_ff | csdr convert_f_s16"+chain_end
elif which == "ssb": return chain_begin + "csdr realpart_cf | csdr fractional_decimator_ff {last_decimation} | csdr agc_ff | csdr limit_ff | csdr convert_f_s16"+chain_end
def set_audio_compression(self,what):
self.audio_compression = what
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 (self.fft_size/2)+(10/2)
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def set_samp_rate(self,samp_rate):
#to change this, restart is required
self.samp_rate=samp_rate
self.decimation=1
while self.samp_rate/(self.decimation+1)>self.output_rate:
self.decimation+=1
self.last_decimation=float(self.if_samp_rate())/self.output_rate
def if_samp_rate(self):
return self.samp_rate/self.decimation
def get_name(self):
return self.name
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def get_output_rate(self):
return self.output_rate
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def set_output_rate(self,output_rate):
self.output_rate=output_rate
self.set_samp_rate(self.samp_rate) #as it depends on output_rate
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def set_demodulator(self,demodulator):
#to change this, restart is required
self.demodulator=demodulator
def get_demodulator(self):
return self.demodulator
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def set_fft_size(self,fft_size):
#to change this, restart is required
self.fft_size=fft_size
def set_fft_fps(self,fft_fps):
#to change this, restart is required
self.fft_fps=fft_fps
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def set_fft_averages(self,fft_averages):
#to change this, restart is required
self.fft_averages=fft_averages
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def fft_block_size(self):
return self.samp_rate/self.fft_fps/self.fft_averages
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def set_format_conversion(self,format_conversion):
self.format_conversion=format_conversion
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def set_offset_freq(self,offset_freq):
self.offset_freq=offset_freq
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if self.running:
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self.shift_pipe_file.write("%g\n"%(-float(self.offset_freq)/self.samp_rate))
self.shift_pipe_file.flush()
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def set_bpf(self,low_cut,high_cut):
self.low_cut=low_cut
self.high_cut=high_cut
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if self.running:
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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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def get_bpf(self):
return [self.low_cut, self.high_cut]
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def set_squelch_level(self, squelch_level):
self.squelch_level=squelch_level
if self.running:
self.squelch_pipe_file.write( "%g\n"%(float(self.squelch_level)) )
self.squelch_pipe_file.flush()
def get_smeter_level(self):
if self.running:
line=self.smeter_pipe_file.readline()
return float(line[:-1])
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def mkfifo(self,path):
try:
os.unlink(path)
except:
pass
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os.mkfifo(path)
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def ddc_transition_bw(self):
return self.ddc_transition_bw_rate*(self.if_samp_rate()/float(self.samp_rate))
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def start(self):
command_base=self.chain(self.demodulator)
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#create control pipes for csdr
pipe_base_path="/tmp/openwebrx_pipe_{myid}_".format(myid=id(self))
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self.bpf_pipe = self.shift_pipe = self.squelch_pipe = self.smeter_pipe = None
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if "{bpf_pipe}" in command_base:
self.bpf_pipe=pipe_base_path+"bpf"
self.mkfifo(self.bpf_pipe)
if "{shift_pipe}" in command_base:
self.shift_pipe=pipe_base_path+"shift"
self.mkfifo(self.shift_pipe)
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if "{squelch_pipe}" in command_base:
self.squelch_pipe=pipe_base_path+"squelch"
self.mkfifo(self.squelch_pipe)
if "{smeter_pipe}" in command_base:
self.smeter_pipe=pipe_base_path+"smeter"
self.mkfifo(self.smeter_pipe)
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#run the command
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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, \
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bpf_transition_bw=float(self.bpf_transition_bw)/self.if_samp_rate(), ddc_transition_bw=self.ddc_transition_bw(), \
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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 )
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print "[openwebrx-dsp-plugin:csdr] Command =",command
#code.interact(local=locals())
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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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self.process = subprocess.Popen(command, stdout=subprocess.PIPE, shell=True, preexec_fn=os.setpgrp, env=my_env)
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self.running = True
#open control pipes for csdr and send initialization data
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if self.bpf_pipe != None:
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self.bpf_pipe_file=open(self.bpf_pipe,"w")
self.set_bpf(self.low_cut,self.high_cut)
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if self.shift_pipe != None:
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self.shift_pipe_file=open(self.shift_pipe,"w")
self.set_offset_freq(self.offset_freq)
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if self.squelch_pipe != None:
self.squelch_pipe_file=open(self.squelch_pipe,"w")
self.set_squelch_level(self.squelch_level)
if self.smeter_pipe != None:
self.smeter_pipe_file=open(self.smeter_pipe,"r")
fcntl.fcntl(self.smeter_pipe_file, fcntl.F_SETFL, os.O_NONBLOCK)
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def read(self,size):
return self.process.stdout.read(size)
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def stop(self):
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os.killpg(os.getpgid(self.process.pid), signal.SIGTERM)
#if(self.process.poll()!=None):return # returns None while subprocess is running
#while(self.process.poll()==None):
# #self.process.kill()
# print "killproc",os.getpgid(self.process.pid),self.process.pid
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# os.killpg(self.process.pid, signal.SIGTERM)
#
# time.sleep(0.1)
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if self.bpf_pipe:
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try: os.unlink(self.bpf_pipe)
except: print "[openwebrx-dsp-plugin:csdr] stop() :: unlink failed: " + self.bpf_pipe
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if self.shift_pipe:
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try: os.unlink(self.shift_pipe)
except: print "[openwebrx-dsp-plugin:csdr] stop() :: unlink failed: " + self.shift_pipe
if self.squelch_pipe:
try: os.unlink(self.squelch_pipe)
except: print "[openwebrx-dsp-plugin:csdr] stop() :: unlink failed: " + self.squelch_pipe
if self.smeter_pipe:
try: os.unlink(self.smeter_pipe)
except: print "[openwebrx-dsp-plugin:csdr] stop() :: unlink failed: " + self.smeter_pipe
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self.running = False
def restart(self):
self.stop()
self.start()
def __del__(self):
self.stop()
del(self.process)