295 lines
11 KiB
Python
295 lines
11 KiB
Python
"""
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OpenWebRX csdr plugin: do the signal processing with csdr
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This file is part of OpenWebRX,
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an open-source SDR receiver software with a web UI.
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Copyright (c) 2013-2015 by Andras Retzler <randras@sdr.hu>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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import subprocess
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import time
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import os
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import code
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import signal
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import fcntl
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import select
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class dsp_plugin:
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def __init__(self):
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self.samp_rate = 250000
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self.output_rate = 11025 #this is default, and cannot be set at the moment
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self.fft_size = 1024
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self.fft_fps = 5
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self.offset_freq = 0
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self.low_cut = -4000
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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
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self.audio_compression = "none"
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self.fft_compression = "none"
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self.demodulator = "nfm"
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self.name = "csdr"
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self.format_conversion = "csdr convert_u8_f"
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self.base_bufsize = 512
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self.nc_port = 4951
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self.csdr_dynamic_bufsize = False
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self.csdr_print_bufsizes = False
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self.csdr_through = False
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self.squelch_level = 0
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def chain(self,which):
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if which in [ "dmr", "dstar", "nxdn", "ysf" ]:
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self.set_output_rate(48000)
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else:
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self.set_output_rate(11025)
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any_chain_base="ncat -v 127.0.0.1 {nc_port} | "
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if self.csdr_dynamic_bufsize: any_chain_base+="csdr setbuf {start_bufsize} | "
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if self.csdr_through: any_chain_base+="csdr through | "
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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":
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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}"
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if self.fft_compression=="adpcm":
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return fft_chain_base+" | csdr compress_fft_adpcm_f_u8 {fft_size}"
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else:
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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 | "
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chain_end = ""
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if self.audio_compression=="adpcm":
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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 convert_f_s16"+chain_end
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if which in [ "dstar", "nxdn" ]:
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c = chain_begin
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c += "csdr fmdemod_quadri_cf | csdr convert_f_s16"
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if which == "dstar":
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c += " | dsd -fd"
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elif which == "nxdn":
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c += " | dsd -fi"
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c += " -i - -o - -u 2 -g 10"
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c += " | sox -t raw -r 8000 -e signed-integer -b 16 -c 1 --input-buffer 160 - -t raw -r 11025 -e signed-integer -b 16 -c 1 - | csdr setbuf 220"
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c += chain_end
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return c
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elif which == "dmr":
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c = chain_begin
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c += "csdr fmdemod_quadri_cf | csdr fastdcblock_ff | csdr convert_f_s16"
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c += " | rrc_filter | gfsk_demodulator | dmr_decoder --fifo {meta_pipe} | mbe_synthesizer"
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c += " | sox -t raw -r 8000 -e signed-integer -b 16 -c 1 --buffer 32 - -t raw -r 11025 -e signed-integer -b 16 -c 1 - | csdr setbuf 256"
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c += chain_end
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return c
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elif which == "ysf":
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c = chain_begin
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c += "csdr fmdemod_quadri_cf | csdr fastdcblock_ff | csdr convert_f_s16"
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c += " | rrc_filter | gfsk_demodulator | ysf_decoder --fifo {meta_pipe} | mbe_synthesizer"
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c += " | sox -t raw -r 8000 -e signed-integer -b 16 -c 1 --buffer 32 - -t raw -r 11025 -e signed-integer -b 16 -c 1 - | csdr setbuf 256"
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c += chain_end
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return c
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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
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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
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def set_audio_compression(self,what):
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self.audio_compression = what
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def set_fft_compression(self,what):
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self.fft_compression = what
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def get_fft_bytes_to_read(self):
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if self.fft_compression=="none": return self.fft_size*4
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if self.fft_compression=="adpcm": return (self.fft_size/2)+(10/2)
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def set_samp_rate(self,samp_rate):
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#to change this, restart is required
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self.samp_rate=samp_rate
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self.decimation=1
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while self.samp_rate/(self.decimation+1)>=self.output_rate:
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self.decimation+=1
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self.last_decimation=float(self.if_samp_rate())/self.output_rate
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def if_samp_rate(self):
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return self.samp_rate/self.decimation
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def get_name(self):
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return self.name
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def get_output_rate(self):
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return self.output_rate
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def set_output_rate(self,output_rate):
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self.output_rate=output_rate
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self.set_samp_rate(self.samp_rate) #as it depends on output_rate
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def set_demodulator(self,demodulator):
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#to change this, restart is required
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self.demodulator=demodulator
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def get_demodulator(self):
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return self.demodulator
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def set_fft_size(self,fft_size):
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#to change this, restart is required
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self.fft_size=fft_size
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def set_fft_fps(self,fft_fps):
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#to change this, restart is required
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self.fft_fps=fft_fps
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def fft_block_size(self):
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return self.samp_rate/self.fft_fps
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def set_format_conversion(self,format_conversion):
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self.format_conversion=format_conversion
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def set_offset_freq(self,offset_freq):
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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))
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self.shift_pipe_file.flush()
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def set_bpf(self,low_cut,high_cut):
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self.low_cut=low_cut
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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()) )
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self.bpf_pipe_file.flush()
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def get_bpf(self):
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return [self.low_cut, self.high_cut]
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def set_squelch_level(self, squelch_level):
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self.squelch_level=squelch_level
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if self.running:
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self.squelch_pipe_file.write( "%g\n"%(float(self.squelch_level)) )
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self.squelch_pipe_file.flush()
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def get_smeter_level(self):
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if self.running:
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line=self.smeter_pipe_file.readline()
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return float(line[:-1])
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def get_metadata(self):
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if self.running and self.meta_pipe:
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return self.meta_pipe_file.readline()
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def mkfifo(self,path):
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try:
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os.unlink(path)
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except:
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pass
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os.mkfifo(path)
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def ddc_transition_bw(self):
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return self.ddc_transition_bw_rate*(self.if_samp_rate()/float(self.samp_rate))
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def start(self):
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command_base=self.chain(self.demodulator)
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#create control pipes for csdr
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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 = self.meta_pipe = None
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if "{bpf_pipe}" in command_base:
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self.bpf_pipe=pipe_base_path+"bpf"
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self.mkfifo(self.bpf_pipe)
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if "{shift_pipe}" in command_base:
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self.shift_pipe=pipe_base_path+"shift"
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self.mkfifo(self.shift_pipe)
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if "{squelch_pipe}" in command_base:
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self.squelch_pipe=pipe_base_path+"squelch"
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self.mkfifo(self.squelch_pipe)
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if "{smeter_pipe}" in command_base:
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self.smeter_pipe=pipe_base_path+"smeter"
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self.mkfifo(self.smeter_pipe)
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if "{meta_pipe}" in command_base:
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self.meta_pipe=pipe_base_path+"meta"
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self.mkfifo(self.meta_pipe)
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else:
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self.meta_pipe=None
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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, \
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last_decimation=self.last_decimation, fft_size=self.fft_size, fft_block_size=self.fft_block_size(), \
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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, \
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squelch_pipe=self.squelch_pipe, smeter_pipe=self.smeter_pipe, meta_pipe=self.meta_pipe )
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print "[openwebrx-dsp-plugin:csdr] Command =",command
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#code.interact(local=locals())
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my_env=os.environ.copy()
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if self.csdr_dynamic_bufsize: my_env["CSDR_DYNAMIC_BUFSIZE_ON"]="1";
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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
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#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")
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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")
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self.set_offset_freq(self.offset_freq)
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if self.squelch_pipe != None:
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self.squelch_pipe_file=open(self.squelch_pipe,"w")
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self.set_squelch_level(self.squelch_level)
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if self.smeter_pipe != None:
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self.smeter_pipe_file=open(self.smeter_pipe,"r")
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fcntl.fcntl(self.smeter_pipe_file, fcntl.F_SETFL, os.O_NONBLOCK)
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if self.meta_pipe != None:
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self.meta_pipe_file=open(self.meta_pipe,"r")
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fcntl.fcntl(self.meta_pipe_file, fcntl.F_SETFL, os.O_NONBLOCK)
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def read(self,size):
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return self.process.stdout.read(size)
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def read_async(self, size):
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if (select.select([self.process.stdout], [], [], 0)[0] != []):
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return self.process.stdout.read(size)
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else:
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return None
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def stop(self):
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os.killpg(os.getpgid(self.process.pid), signal.SIGTERM)
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#if(self.process.poll()!=None):return # returns None while subprocess is running
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#while(self.process.poll()==None):
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# #self.process.kill()
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# print "killproc",os.getpgid(self.process.pid),self.process.pid
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# os.killpg(self.process.pid, signal.SIGTERM)
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#
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# time.sleep(0.1)
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if self.bpf_pipe:
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try: os.unlink(self.bpf_pipe)
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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)
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except: print "[openwebrx-dsp-plugin:csdr] stop() :: unlink failed: " + self.shift_pipe
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if self.squelch_pipe:
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try: os.unlink(self.squelch_pipe)
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except: print "[openwebrx-dsp-plugin:csdr] stop() :: unlink failed: " + self.squelch_pipe
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if self.smeter_pipe:
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try: os.unlink(self.smeter_pipe)
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except: print "[openwebrx-dsp-plugin:csdr] stop() :: unlink failed: " + self.smeter_pipe
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if self.meta_pipe:
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try: os.unlink(self.meta_pipe)
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except: print "[openwebrx-dsp-plugin:csdr] stop() :: unlink failed: " + self.meta_pipe
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self.running = False
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def restart(self):
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self.stop()
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self.start()
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def __del__(self):
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self.stop()
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del(self.process)
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