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first stab at ft8 decoding: chop up audio, call jt9 binary to decode

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Jakob Ketterl
2019-07-06 18:21:43 +02:00
parent 3f05565b7b
commit 284646ee6c
4 changed files with 101 additions and 4 deletions
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21
csdr.py
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@ -21,11 +21,11 @@ OpenWebRX csdr plugin: do the signal processing with csdr
"""
import subprocess
import time
import os
import signal
import threading
from functools import partial
from owrx.wsjt import Ft8Chopper
import logging
logger = logging.getLogger(__name__)
@ -186,6 +186,12 @@ class dsp(object):
"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"
elif which == "ft8":
chain = secondary_chain_base + "csdr realpart_cf | "
if self.last_decimation != 1.0 :
chain += "csdr fractional_decimator_ff {last_decimation} | "
chain += "csdr agc_ff | csdr limit_ff | csdr convert_f_s16"
return chain
def set_secondary_demodulator(self, what):
if self.get_secondary_demodulator() == what:
@ -238,7 +244,8 @@ class dsp(object):
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()
if_samp_rate=self.if_samp_rate(),
last_decimation=self.last_decimation
)
logger.debug("[openwebrx-dsp-plugin:csdr] secondary command (fft) = %s", secondary_command_fft)
@ -253,7 +260,11 @@ class dsp(object):
self.secondary_processes_running = True
self.output.add_output("secondary_fft", partial(self.secondary_process_fft.stdout.read, int(self.get_secondary_fft_bytes_to_read())))
self.output.add_output("secondary_demod", partial(self.secondary_process_demod.stdout.read, 1))
if self.get_secondary_demodulator() == "ft8":
chopper = Ft8Chopper(self.secondary_process_demod.stdout)
chopper.start()
else:
self.output.add_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
@ -262,7 +273,7 @@ class dsp(object):
def set_secondary_offset_freq(self, value):
self.secondary_offset_freq=value
if self.secondary_processes_running:
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()
@ -332,6 +343,8 @@ class dsp(object):
def get_audio_rate(self):
if self.isDigitalVoice():
return 48000
elif self.secondary_demodulator == "ft8":
return 12000
return self.get_output_rate()
def isDigitalVoice(self, demodulator = None):