joachim/openwebrx-clone
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

demodulator chain optimizations

Browse Source
This commit is contained in:
Jakob Ketterl 2019-05-16 21:26:31 +02:00
parent b1596cbb60
commit a6c845de16
1 changed files with 48 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

80
csdr.py
View File

@ -68,7 +68,7 @@ class dsp(object):
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"]
self.secondary_pipe_names=["secondary_shift_pipe"]
self.secondary_pipe_names=["secondary_shift_dpipe"]
self.secondary_offset_freq = 1000
self.modification_lock = threading.Lock()
self.output = output
@ -85,36 +85,42 @@ class dsp(object):
chain += " | csdr compress_fft_adpcm_f_u8 {fft_size}"
return chain
chain += "csdr shift_addition_cc --fifo {shift_pipe} | "
if which in ["dstar", "nxdn", "dmr", "ysf"]:
chain += "csdr fir_decimate_cc {digital_decimation} {ddc_transition_bw} HAMMING | "
else:
chain += "csdr fir_decimate_cc {decimation} {ddc_transition_bw} HAMMING | "
chain += "csdr fir_decimate_cc {decimation} {ddc_transition_bw} HAMMING | "
chain += "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 | "
if self.secondary_demodulator:
chain += "csdr tee {iqtee_pipe} | "
chain += "csdr tee {iqtee2_pipe} | "
# safe some cpu cycles... no need to decimate if decimation factor is 1
last_decimation_block = "csdr old_fractional_decimator_ff {last_decimation} | " if self.last_decimation != 1.0 else ""
if which == "nfm":
chain += "csdr fmdemod_quadri_cf | csdr limit_ff | csdr old_fractional_decimator_ff {last_decimation} | csdr deemphasis_nfm_ff {output_rate} | csdr convert_f_s16"
elif which in [ "dstar", "nxdn" ]:
chain += "csdr fmdemod_quadri_cf | csdr fastdcblock_ff | csdr old_fractional_decimator_ff {digital_last_decimation} | csdr convert_f_s16"
if which == "dstar":
chain += " | dsd -fd"
elif which == "nxdn":
chain += " | dsd -fi"
chain += " -i - -o - -u 2 -g 10"
chain += " | sox -t raw -r 8000 -e signed-integer -b 16 -c 1 --input-buffer 160 - -t raw -r {output_rate} -e signed-integer -b 16 -c 1 - | csdr setbuf 220"
elif which == "dmr":
chain += "csdr fmdemod_quadri_cf | csdr fastdcblock_ff | csdr old_fractional_decimator_ff {digital_last_decimation} | csdr convert_f_s16"
chain += " | rrc_filter | gfsk_demodulator | dmr_decoder --fifo {meta_pipe} | mbe_synthesizer"
chain += " | sox -t raw -r 8000 -e signed-integer -b 16 -c 1 --buffer 32 - -t raw -r {output_rate} -e signed-integer -b 16 -c 1 - | csdr setbuf 256"
elif which == "ysf":
chain += "csdr fmdemod_quadri_cf | csdr fastdcblock_ff | csdr old_fractional_decimator_ff {digital_last_decimation} | csdr convert_f_s16"
chain += " | rrc_filter | gfsk_demodulator | ysf_decoder --fifo {meta_pipe} | mbe_synthesizer -y"
chain += " | sox -t raw -r 8000 -e signed-integer -b 16 -c 1 --buffer 32 - -t raw -r {output_rate} -e signed-integer -b 16 -c 1 - | csdr setbuf 256"
chain += "csdr fmdemod_quadri_cf | csdr limit_ff | "
chain += last_decimation_block
chain += "csdr deemphasis_nfm_ff {output_rate} | csdr convert_f_s16"
elif self.isDigitalVoice(which):
chain += "csdr fmdemod_quadri_cf | csdr fastdcblock_ff | "
chain += last_decimation_block
chain += "csdr convert_f_s16 | "
if which in [ "dstar", "nxdn" ]:
if which == "dstar":
chain += "dsd -fd"
elif which == "nxdn":
chain += "dsd -fi"
chain += " -i - -o - -u 2 -g 10 | "
chain += "sox -t raw -r 8000 -e signed-integer -b 16 -c 1 --input-buffer 160 - -t raw -r {output_rate} -e signed-integer -b 16 -c 1 - | csdr setbuf 220"
elif which == "dmr":
chain += "rrc_filter | gfsk_demodulator | dmr_decoder --fifo {meta_pipe} | mbe_synthesizer | "
chain += "sox -t raw -r 8000 -e signed-integer -b 16 -c 1 --buffer 32 - -t raw -r {output_rate} -e signed-integer -b 16 -c 1 - | csdr setbuf 256"
elif which == "ysf":
chain += "rrc_filter | gfsk_demodulator | ysf_decoder --fifo {meta_pipe} | mbe_synthesizer -y | "
chain += "sox -t raw -r 8000 -e signed-integer -b 16 -c 1 --buffer 32 - -t raw -r {output_rate} -e signed-integer -b 16 -c 1 - | csdr setbuf 256"
elif which == "am":
chain += "csdr amdemod_cf | csdr fastdcblock_ff | csdr old_fractional_decimator_ff {last_decimation} | csdr agc_ff | csdr limit_ff | csdr convert_f_s16"
chain += "csdr amdemod_cf | csdr fastdcblock_ff | "
chain += last_decimation_block
chain += "csdr agc_ff | csdr limit_ff | csdr convert_f_s16"
elif which == "ssb":
chain += "csdr realpart_cf | csdr old_fractional_decimator_ff {last_decimation} | csdr agc_ff | csdr limit_ff | csdr convert_f_s16"
chain += "csdr realpart_cf | "
chain += last_decimation_block
chain += "csdr agc_ff | csdr limit_ff | csdr convert_f_s16"
if self.audio_compression=="adpcm":
chain += " | csdr encode_ima_adpcm_i16_u8"
@ -252,14 +258,15 @@ class dsp(object):
if self.running: self.restart()
def calculate_decimation(self):
(self.decimation, self.last_decimation) = self.get_decimation(self.output_rate)
(self.decimation, self.last_decimation, _) = self.get_decimation(self.samp_rate, self.get_audio_rate())
def get_decimation(self, output_rate):
def get_decimation(self, input_rate, output_rate):
decimation=1
while self.samp_rate/ (decimation+1) >= output_rate:
while input_rate / (decimation+1) >= output_rate:
decimation += 1
last_decimation = float(self.samp_rate / decimation) / output_rate
return (decimation, last_decimation)
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
@ -270,6 +277,16 @@ class dsp(object):
def get_output_rate(self):
return self.output_rate
def get_audio_rate(self):
if self.isDigitalVoice():
return 48000
return self.get_output_rate()
def isDigitalVoice(self, demodulator = None):
if demodulator is None:
demodulator = self.get_demodulator()
return demodulator in ["dmr", "dstar", "nxdn", "ysf"]
def set_output_rate(self,output_rate):
self.output_rate=output_rate
self.calculate_decimation()
@ -277,6 +294,7 @@ class dsp(object):
def set_demodulator(self,demodulator):
if (self.demodulator == demodulator): return
self.demodulator=demodulator
self.calculate_decimation()
self.restart()
def get_demodulator(self):
@ -366,15 +384,13 @@ class dsp(object):
self.try_create_pipes(self.pipe_names, command_base)
(digital_decimation, digital_last_decimation) = self.get_decimation(48000)
#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(), digital_decimation = digital_decimation, digital_last_decimation = digital_last_decimation)
output_rate = self.get_output_rate())
logger.debug("[openwebrx-dsp-plugin:csdr] Command = %s", command)
my_env=os.environ.copy()