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FreeDATA/tnc/modem.py
DJ2LS 468f660ebe improved hamlib integration 
...also updated node dependencies to latest version...
2021-09-25 13:33:13 +02:00

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Wed Dec 23 07:04:24 2020
@author: DJ2LS
"""
import ctypes
from ctypes import *
import pathlib
import pyaudio
import audioop
import asyncio
#import sys
import logging
import time
import threading
import atexit
import helpers
import static
import data_handler
import sys
#sys.path.append("hamlib/linux")
try:
import Hamlib
print("running Hamlib from Sys Path")
except ImportError:
from hamlib.linux import Hamlib
print("running Hamlib from precompiled bundle")
else:
# place for rigctld
pass
import numpy as np
#import rigctld
#rigctld = rigctld.Rigctld()
MODEM_STATS_NR_MAX = 320
MODEM_STATS_NC_MAX = 51
class MODEMSTATS(ctypes.Structure):
_fields_ = [
("Nc", ctypes.c_int),
("snr_est", ctypes.c_float),
("rx_symbols", (ctypes.c_float * MODEM_STATS_NR_MAX)*MODEM_STATS_NC_MAX),
("nr", ctypes.c_int),
("sync", ctypes.c_int),
("foff", ctypes.c_float),
("rx_timing", ctypes.c_float),
("clock_offset", ctypes.c_float),
("sync_metric", ctypes.c_float),
("pre", ctypes.c_int),
("post", ctypes.c_int),
("uw_fails", ctypes.c_int),
]
class RF():
def __init__(self):
# -------------------------------------------- LOAD FREEDV
try:
# we check at first for libcodec2 in root - necessary if we want to run it inside a pyinstaller binary
libname = pathlib.Path("libcodec2.so.1.0")
self.c_lib = ctypes.CDLL(libname)
print("running libcodec from INTERNAL library")
except:
# if we cant load libcodec from root, we check for subdirectory
# this is, if we want to run it without beeing build in a dev environment
libname = pathlib.Path().absolute() / "codec2/build_linux/src/libcodec2.so.1.0"
self.c_lib = ctypes.CDLL(libname)
print("running libcodec from EXTERNAL library")
# --------------------------------------------CREATE PYAUDIO INSTANCE
self.p = pyaudio.PyAudio()
atexit.register(self.p.terminate)
# --------------------------------------------OPEN AUDIO CHANNEL RX
self.stream_rx = self.p.open(format=pyaudio.paInt16,
channels=static.AUDIO_CHANNELS,
rate=static.AUDIO_SAMPLE_RATE_RX,
frames_per_buffer=static.AUDIO_FRAMES_PER_BUFFER,
input=True,
input_device_index=static.AUDIO_INPUT_DEVICE
)
# --------------------------------------------OPEN AUDIO CHANNEL TX
self.stream_tx = self.p.open(format=pyaudio.paInt16,
channels=1,
rate=static.AUDIO_SAMPLE_RATE_TX,
frames_per_buffer=static.AUDIO_FRAMES_PER_BUFFER, # n_nom_modem_samples
output=True,
output_device_index=static.AUDIO_OUTPUT_DEVICE, # static.AUDIO_OUTPUT_DEVICE
)
self.streambuffer = bytes(0)
self.audio_writing_to_stream = False
# --------------------------------------------START DECODER THREAD
DECODER_THREAD = threading.Thread(target=self.receive, name="DECODER_THREAD")
DECODER_THREAD.start()
PLAYBACK_THREAD = threading.Thread(target=self.play_audio, name="PLAYBACK_THREAD")
PLAYBACK_THREAD.start()
self.fft_data = bytes()
FFT_THREAD = threading.Thread(target=self.calculate_fft, name="FFT_THREAD")
FFT_THREAD.start()
# --------------------------------------------CONFIGURE HAMLIB
#my_rig.set_ptt(Hamlib.RIG_PTT_RIG,0)
#my_rig.set_ptt(Hamlib.RIG_PTT_SERIAL_DTR,0)
#my_rig.set_ptt(Hamlib.RIG_PTT_SERIAL_RTS,1)
#self.my_rig.set_conf("dtr_state", "OFF")
#my_rig.set_conf("rts_state", "OFF")
#self.my_rig.set_conf("ptt_type", "RTS")
#my_rig.set_conf("ptt_type", "RIG_PTT_SERIAL_RTS")
# try to init hamlib
try:
Hamlib.rig_set_debug(Hamlib.RIG_DEBUG_NONE)
self.my_rig = Hamlib.Rig(int(static.HAMLIB_DEVICE_ID))
self.my_rig.set_conf("rig_pathname", static.HAMLIB_DEVICE_PORT)
self.my_rig.set_conf("retry", "5")
self.my_rig.set_conf("serial_speed", static.HAMLIB_SERIAL_SPEED)
self.my_rig.set_conf("serial_handshake", "None")
self.my_rig.set_conf("stop_bits", "1")
self.my_rig.set_conf("data_bits", "8")
if static.HAMLIB_PTT_TYPE == 'RIG':
self.hamlib_ptt_type = Hamlib.RIG_PTT_RIG
elif static.HAMLIB_PTT_TYPE == 'DTR-H':
self.hamlib_ptt_type = Hamlib.RIG_PTT_SERIAL_DTR
self.my_rig.set_conf("dtr_state", "HIGH")
self.my_rig.set_conf("ptt_type", "DTR")
elif static.HAMLIB_PTT_TYPE == 'DTR-L':
self.hamlib_ptt_type = Hamlib.RIG_PTT_SERIAL_DTR
self.my_rig.set_conf("dtr_state", "LOW")
self.my_rig.set_conf("ptt_type", "DTR")
elif static.HAMLIB_PTT_TYPE == 'RTS':
self.hamlib_ptt_type = Hamlib.RIG_PTT_SERIAL_RTS
self.my_rig.set_conf("dtr_state", "OFF")
self.my_rig.set_conf("ptt_type", "RTS")
elif static.HAMLIB_PTT_TYPE == 'PARALLEL':
self.hamlib_ptt_type = Hamlib.RIG_PTT_PARALLEL
elif static.HAMLIB_PTT_TYPE == 'MICDATA':
self.hamlib_ptt_type = Hamlib.RIG_PTT_RIG_MICDATA
elif static.HAMLIB_PTT_TYPE == 'CM108':
self.hamlib_ptt_type = Hamlib.RIG_PTT_CM108
else: # static.HAMLIB_PTT_TYPE == 'RIG_PTT_NONE':
self.hamlib_ptt_type = Hamlib.RIG_PTT_NONE
self.my_rig.open()
atexit.register(self.my_rig.close)
# set rig mode to USB
self.my_rig.set_mode(Hamlib.RIG_MODE_USB)
# start thread for getting hamlib data
HAMLIB_THREAD = threading.Thread(target=self.get_radio_stats, name="HAMLIB_THREAD")
HAMLIB_THREAD.start()
except:
print("Unexpected error:", sys.exc_info()[0])
print("can't open rig")
sys.exit("hamlib error")
# --------------------------------------------------------------------------------------------------------
def ptt_and_wait(self, state):
static.PTT_STATE = state
if state:
self.my_rig.set_ptt(self.hamlib_ptt_type, 1)
#rigctld.ptt_enable()
ptt_toggle_timeout = time.time() + 0.5
while time.time() < ptt_toggle_timeout:
pass
else:
ptt_toggle_timeout = time.time() + 0.5
while time.time() < ptt_toggle_timeout:
pass
self.my_rig.set_ptt(self.hamlib_ptt_type, 0)
#rigctld.ptt_disable()
return False
def play_audio(self):
while True:
time.sleep(0.01)
#while len(self.streambuffer) > 0:
# time.sleep(0.01)
if len(self.streambuffer) > 0 and self.audio_writing_to_stream:
self.streambuffer = bytes(self.streambuffer)
# we need t wait a little bit until the buffer is filled. If we are not waiting, we are sending empty data
time.sleep(0.1)
self.stream_tx.write(self.streambuffer)
# clear stream buffer after sending
self.streambuffer = bytes()
self.audio_writing_to_stream = False
# --------------------------------------------------------------------------------------------------------
def transmit_signalling(self, data_out, count):
state_before_transmit = static.CHANNEL_STATE
static.CHANNEL_STATE = 'SENDING_SIGNALLING'
#print(static.CHANNEL_STATE)
self.c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte)
freedv = self.c_lib.freedv_open(static.FREEDV_SIGNALLING_MODE)
bytes_per_frame = int(self.c_lib.freedv_get_bits_per_modem_frame(freedv) / 8)
payload_per_frame = bytes_per_frame - 2
n_nom_modem_samples = self.c_lib.freedv_get_n_nom_modem_samples(freedv)
n_tx_modem_samples = self.c_lib.freedv_get_n_tx_modem_samples(freedv) # get n_tx_modem_samples which defines the size of the modulation object
n_tx_preamble_modem_samples = self.c_lib.freedv_get_n_tx_preamble_modem_samples(freedv)
n_tx_postamble_modem_samples = self.c_lib.freedv_get_n_tx_postamble_modem_samples(freedv)
mod_out = ctypes.c_short * n_tx_modem_samples
mod_out = mod_out()
mod_out_preamble = ctypes.c_short * n_tx_preamble_modem_samples # *2 #1760 for mode 10,11,12 #4000 for mode 9
mod_out_preamble = mod_out_preamble()
mod_out_postamble = ctypes.c_short * n_tx_postamble_modem_samples # *2 #1760 for mode 10,11,12 #4000 for mode 9
mod_out_postamble = mod_out_postamble()
buffer = bytearray(payload_per_frame) # use this if CRC16 checksum is required ( DATA1-3)
buffer[:len(data_out)] = data_out # set buffersize to length of data which will be send
crc = ctypes.c_ushort(self.c_lib.freedv_gen_crc16(bytes(buffer), payload_per_frame)) # generate CRC16
crc = crc.value.to_bytes(2, byteorder='big') # convert crc to 2 byte hex string
buffer += crc # append crc16 to buffer
data = (ctypes.c_ubyte * bytes_per_frame).from_buffer_copy(buffer)
self.c_lib.freedv_rawdatapreambletx(freedv, mod_out_preamble)
self.c_lib.freedv_rawdatatx(freedv, mod_out, data) # modulate DATA and safe it into mod_out pointer
self.c_lib.freedv_rawdatapostambletx(freedv, mod_out_postamble)
self.streambuffer = bytearray()
self.streambuffer += bytes(mod_out_preamble)
self.streambuffer += bytes(mod_out)
self.streambuffer += bytes(mod_out_postamble)
converted_audio = audioop.ratecv(self.streambuffer,2,1,static.MODEM_SAMPLE_RATE, static.AUDIO_SAMPLE_RATE_TX, None)
self.streambuffer = bytes(converted_audio[0])
# append frame again with as much as in count defined
for i in range(1, count):
self.streambuffer += bytes(converted_audio[0])
#print(len(self.streambuffer))
#self.streambuffer += bytes(converted_audio[0])
#print(len(self.streambuffer))
# -------------- transmit audio
#logging.debug("SENDING SIGNALLING FRAME " + str(data_out))
##state_before_transmit = static.CHANNEL_STATE
##static.CHANNEL_STATE = 'SENDING_SIGNALLING'
while self.ptt_and_wait(True):
pass
self.audio_writing_to_stream = True
# wait until audio has been processed
while self.audio_writing_to_stream:
time.sleep(0.01)
static.CHANNEL_STATE = 'SENDING_SIGNALLING'
self.ptt_and_wait(False)
## we have a problem with the receiving state
##static.CHANNEL_STATE = state_before_transmit
if state_before_transmit != 'RECEIVING_DATA':
static.CHANNEL_STATE = 'RECEIVING_SIGNALLING'
else:
static.CHANNEL_STATE = state_before_transmit
self.c_lib.freedv_close(freedv)
# --------------------------------------------------------------------------------------------------------
# GET ARQ BURST FRAME VOM BUFFER AND MODULATE IT
def transmit_arq_burst(self):
# we could place this timing part inside the modem...
# lets see if this is a good idea..
static.ARQ_DATA_CHANNEL_LAST_RECEIVED = int(time.time()) # we need to update our timeout timestamp
static.ARQ_START_OF_BURST = int(time.time()) # we need to update our timeout timestamp
state_before_transmit = static.CHANNEL_STATE
static.CHANNEL_STATE = 'SENDING_DATA'
self.c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte)
freedv = self.c_lib.freedv_open(static.ARQ_DATA_CHANNEL_MODE)
static.FREEDV_DATA_BYTES_PER_FRAME = int(self.c_lib.freedv_get_bits_per_modem_frame(freedv) / 8)
static.FREEDV_DATA_PAYLOAD_PER_FRAME = static.FREEDV_DATA_BYTES_PER_FRAME - 2
n_nom_modem_samples = self.c_lib.freedv_get_n_nom_modem_samples(freedv)
n_tx_modem_samples = self.c_lib.freedv_get_n_tx_modem_samples(freedv) # *2 #get n_tx_modem_samples which defines the size of the modulation object
n_tx_preamble_modem_samples = self.c_lib.freedv_get_n_tx_preamble_modem_samples(freedv)
n_tx_postamble_modem_samples = self.c_lib.freedv_get_n_tx_postamble_modem_samples(freedv)
mod_out = ctypes.c_short * n_tx_modem_samples
mod_out = mod_out()
mod_out_preamble = ctypes.c_short * n_tx_preamble_modem_samples # *2 #1760 for mode 10,11,12 #4000 for mode 9
mod_out_preamble = mod_out_preamble()
mod_out_postamble = ctypes.c_short * n_tx_postamble_modem_samples # *2 #1760 for mode 10,11,12 #4000 for mode 9
mod_out_postamble = mod_out_postamble()
self.streambuffer = bytearray()
self.c_lib.freedv_rawdatapreambletx(freedv, mod_out_preamble)
self.streambuffer += bytes(mod_out_preamble)
if not static.ARQ_RPT_RECEIVED:
for n in range(0, static.ARQ_TX_N_FRAMES_PER_BURST):
# ---------------------------BUILD ARQ BURST ---------------------------------------------------------------------
frame_type = 10 + n + 1 # static.ARQ_TX_N_FRAMES_PER_BURST
frame_type = bytes([frame_type])
payload_data = bytes(static.TX_BUFFER[static.ARQ_N_SENT_FRAMES + n])
n_current_arq_frame = static.ARQ_N_SENT_FRAMES + n + 1
static.ARQ_TX_N_CURRENT_ARQ_FRAME = n_current_arq_frame.to_bytes(2, byteorder='big')
n_total_arq_frame = len(static.TX_BUFFER)
#static.ARQ_TX_N_TOTAL_ARQ_FRAMES = n_total_arq_frame
arqframe = frame_type + \
bytes([static.ARQ_TX_N_FRAMES_PER_BURST]) + \
static.ARQ_TX_N_CURRENT_ARQ_FRAME + \
n_total_arq_frame.to_bytes(2, byteorder='big') + \
static.DXCALLSIGN_CRC8 + \
static.MYCALLSIGN_CRC8 + \
payload_data
buffer = bytearray(static.FREEDV_DATA_PAYLOAD_PER_FRAME) # create TX buffer
buffer[:len(arqframe)] = arqframe # set buffersize to length of data which will be send
crc = ctypes.c_ushort(self.c_lib.freedv_gen_crc16(bytes(buffer), static.FREEDV_DATA_PAYLOAD_PER_FRAME)) # generate CRC16
crc = crc.value.to_bytes(2, byteorder='big') # convert crc to 2 byte hex string
buffer += crc # append crc16 to buffer
data = (ctypes.c_ubyte * static.FREEDV_DATA_BYTES_PER_FRAME).from_buffer_copy(buffer)
self.c_lib.freedv_rawdatatx(freedv, mod_out, data) # modulate DATA and safe it into mod_out pointer
self.streambuffer += bytes(mod_out)
elif static.ARQ_RPT_RECEIVED:
for n in range(0, len(static.ARQ_RPT_FRAMES)):
missing_frame = int.from_bytes(static.ARQ_RPT_FRAMES[n], "big")
# ---------------------------BUILD ARQ BURST ---------------------------------------------------------------------
frame_type = 10 + missing_frame # static.ARQ_TX_N_FRAMES_PER_BURST
frame_type = bytes([frame_type])
try:
payload_data = bytes(static.TX_BUFFER[static.ARQ_N_SENT_FRAMES + missing_frame - 1])
except:
print("modem buffer selection problem with ARQ RPT frames")
n_current_arq_frame = static.ARQ_N_SENT_FRAMES + missing_frame
static.ARQ_TX_N_CURRENT_ARQ_FRAME = n_current_arq_frame.to_bytes(2, byteorder='big')
n_total_arq_frame = len(static.TX_BUFFER)
#static.ARQ_TX_N_TOTAL_ARQ_FRAMES = n_total_arq_frame
arqframe = frame_type + \
bytes([static.ARQ_TX_N_FRAMES_PER_BURST]) + \
static.ARQ_TX_N_CURRENT_ARQ_FRAME + \
n_total_arq_frame.to_bytes(2, byteorder='big') + \
static.DXCALLSIGN_CRC8 + \
static.MYCALLSIGN_CRC8 + \
payload_data
buffer = bytearray(static.FREEDV_DATA_PAYLOAD_PER_FRAME) # create TX buffer
buffer[:len(arqframe)] = arqframe # set buffersize to length of data which will be send
crc = ctypes.c_ushort(self.c_lib.freedv_gen_crc16(bytes(buffer), static.FREEDV_DATA_PAYLOAD_PER_FRAME)) # generate CRC16
crc = crc.value.to_bytes(2, byteorder='big') # convert crc to 2 byte hex string
buffer += crc # append crc16 to buffer
data = (ctypes.c_ubyte * static.FREEDV_DATA_BYTES_PER_FRAME).from_buffer_copy(buffer)
self.c_lib.freedv_rawdatatx(freedv, mod_out, data) # modulate DATA and safe it into mod_out pointer
self.streambuffer += bytes(mod_out)
self.c_lib.freedv_rawdatapostambletx(freedv, mod_out_postamble)
self.streambuffer += bytes(mod_out_postamble)
converted_audio = audioop.ratecv(self.streambuffer,2,1,static.MODEM_SAMPLE_RATE, static.AUDIO_SAMPLE_RATE_TX, None)
self.streambuffer = bytes(converted_audio[0])
# -------------- transmit audio
while self.ptt_and_wait(True):
pass
# this triggers writing buffer to audio stream
# this way we are able to run this non blocking
# this needs to be optimized!
self.audio_writing_to_stream = True
# wait until audio has been processed
while self.audio_writing_to_stream:
time.sleep(0.01)
static.CHANNEL_STATE = 'SENDING_DATA'
static.CHANNEL_STATE = 'RECEIVING_SIGNALLING'
self.ptt_and_wait(False)
# close codec2 instance
self.c_lib.freedv_close(freedv)
# --------------------------------------------------------------------------------------------------------
def receive(self):
# DATAC0
self.c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte)
datac0_freedv = self.c_lib.freedv_open(14)
self.c_lib.freedv_get_bits_per_modem_frame(datac0_freedv)
datac0_bytes_per_frame = int(self.c_lib.freedv_get_bits_per_modem_frame(datac0_freedv)/8)
datac0_n_max_modem_samples = self.c_lib.freedv_get_n_max_modem_samples(datac0_freedv)
datac0_bytes_out = (ctypes.c_ubyte * datac0_bytes_per_frame) #bytes_per_frame
datac0_bytes_out = datac0_bytes_out() #get pointer from bytes_out
self.c_lib.freedv_set_frames_per_burst(datac0_freedv,1)
datac0_modem_stats_snr = c_float()
datac0_modem_stats_sync = c_int()
datac0_buffer = bytes()
static.FREEDV_SIGNALLING_BYTES_PER_FRAME = datac0_bytes_per_frame
static.FREEDV_SIGNALLING_PAYLOAD_PER_FRAME = datac0_bytes_per_frame - 2
# DATAC1
self.c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte)
datac1_freedv = self.c_lib.freedv_open(10)
datac1_bytes_per_frame = int(self.c_lib.freedv_get_bits_per_modem_frame(datac1_freedv)/8)
datac1_n_max_modem_samples = self.c_lib.freedv_get_n_max_modem_samples(datac1_freedv)
datac1_bytes_out = (ctypes.c_ubyte * datac1_bytes_per_frame) #bytes_per_frame
datac1_bytes_out = datac1_bytes_out() #get pointer from bytes_out
self.c_lib.freedv_set_frames_per_burst(datac1_freedv,1)
datac1_modem_stats_snr = c_float()
datac1_modem_stats_sync = c_int()
datac1_buffer = bytes()
# DATAC3
self.c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte)
datac3_freedv = self.c_lib.freedv_open(12)
datac3_bytes_per_frame = int(self.c_lib.freedv_get_bits_per_modem_frame(datac3_freedv)/8)
datac3_n_max_modem_samples = self.c_lib.freedv_get_n_max_modem_samples(datac3_freedv)
datac3_bytes_out = (ctypes.c_ubyte * datac3_bytes_per_frame) #bytes_per_frame
datac3_bytes_out = datac3_bytes_out() #get pointer from bytes_out
self.c_lib.freedv_set_frames_per_burst(datac3_freedv,1)
datac3_modem_stats_snr = c_float()
datac3_modem_stats_sync = c_int()
datac3_buffer = bytes()
'''
if mode == static.ARQ_DATA_CHANNEL_MODE:
static.FREEDV_DATA_BYTES_PER_FRAME = bytes_per_frame
static.FREEDV_DATA_PAYLOAD_PER_FRAME = bytes_per_frame - 2
self.c_lib.freedv_set_frames_per_burst(freedv, 0)
else:
#pass
self.c_lib.freedv_set_frames_per_burst(freedv, 0)
'''
while static.FREEDV_RECEIVE == True:
'''
# refresh vars, so the correct parameters of the used mode are set
if mode == static.ARQ_DATA_CHANNEL_MODE:
static.FREEDV_DATA_BYTES_PER_FRAME = bytes_per_frame
static.FREEDV_DATA_PAYLOAD_PER_FRAME = bytes_per_frame - 2
'''
data_in = bytes()
data_in = self.stream_rx.read(1024, exception_on_overflow = False)
#self.fft_data = data_in
data_in = audioop.ratecv(data_in,2,1,static.AUDIO_SAMPLE_RATE_RX, static.MODEM_SAMPLE_RATE, None)
data_in = data_in[0]#.rstrip(b'\x00')
self.fft_data = data_in
# we need to set nin * 2 beause of byte size in array handling
datac0_nin = self.c_lib.freedv_nin(datac0_freedv) * 2
datac1_nin = self.c_lib.freedv_nin(datac1_freedv) * 2
datac3_nin = self.c_lib.freedv_nin(datac3_freedv) * 2
# refill buffer only if every mode has worked with its data
if (len(datac0_buffer) < (datac0_nin*2)) and (len(datac1_buffer) < (datac1_nin*2)) and (len(datac3_buffer) < (datac3_nin*2)):
datac0_buffer += data_in
datac1_buffer += data_in
datac3_buffer += data_in
# DECODING DATAC0
if len(datac0_buffer) >= (datac0_nin):
datac0_audio = datac0_buffer[:datac0_nin]
datac0_buffer = datac0_buffer[datac0_nin:]
#print(len(datac0_audio))
self.c_lib.freedv_rawdatarx.argtype = [ctypes.POINTER(ctypes.c_ubyte), datac0_bytes_out, datac0_audio]
nbytes = self.c_lib.freedv_rawdatarx(datac0_freedv, datac0_bytes_out, datac0_audio) # demodulate audio
sync = self.c_lib.freedv_get_rx_status(datac0_freedv)
if sync != 0 and nbytes != 0:
#calculate snr and scatter
self.get_scatter(datac0_freedv)
self.calculate_snr(datac0_freedv)
datac0_task = threading.Thread(target=self.process_data, args=[datac0_bytes_out, datac0_freedv])
datac0_task.start()
# DECODING DATAC1
if len(datac1_buffer) >= (datac1_nin):
datac1_audio = datac1_buffer[:datac1_nin]
datac1_buffer = datac1_buffer[datac1_nin:]
#print(len(datac1_audio))
self.c_lib.freedv_rawdatarx.argtype = [ctypes.POINTER(ctypes.c_ubyte), datac1_bytes_out, datac1_audio]
nbytes = self.c_lib.freedv_rawdatarx(datac1_freedv, datac1_bytes_out, datac1_audio) # demodulate audio
sync = self.c_lib.freedv_get_rx_status(datac1_freedv)
if sync != 0 and nbytes != 0:
#calculate snr and scatter
self.get_scatter(datac1_freedv)
self.calculate_snr(datac1_freedv)
datac1_task = threading.Thread(target=self.process_data, args=[datac1_bytes_out, datac1_freedv])
datac1_task.start()
# DECODING DATAC3
if len(datac3_buffer) >= (datac3_nin):
datac3_audio = datac3_buffer[:datac3_nin]
datac3_buffer = datac3_buffer[datac3_nin:]
self.c_lib.freedv_rawdatarx.argtype = [ctypes.POINTER(ctypes.c_ubyte), datac3_bytes_out, datac3_audio]
nbytes = self.c_lib.freedv_rawdatarx(datac3_freedv, datac3_bytes_out, datac3_audio) # demodulate audio
sync = self.c_lib.freedv_get_rx_status(datac3_freedv)
if sync != 0 and nbytes != 0:
#calculate snr and scatter
self.get_scatter(datac3_freedv)
self.calculate_snr(datac3_freedv)
datac3_task = threading.Thread(target=self.process_data, args=[datac3_bytes_out, datac3_freedv])
datac3_task.start()
# forward data only if broadcast or we are the receiver
# bytes_out[1:2] == callsign check for signalling frames, bytes_out[6:7] == callsign check for data frames, bytes_out[1:2] == b'\x01' --> broadcasts like CQ
# we could also create an own function, which returns True. In this case we could add callsign blacklists and so on
def process_data(self, bytes_out, freedv):
force = True
print(bytes(bytes_out))
if bytes(bytes_out[1:2]) == static.MYCALLSIGN_CRC8 or bytes(bytes_out[6:7]) == static.MYCALLSIGN_CRC8 or bytes(bytes_out[1:2]) == b'\x01':
helpers.calculate_transfer_rate()
# CHECK IF FRAMETYPE IS BETWEEN 10 and 50 ------------------------
frametype = int.from_bytes(bytes(bytes_out[:1]), "big")
frame = frametype - 10
n_frames_per_burst = int.from_bytes(bytes(bytes_out[1:2]), "big")
#self.c_lib.freedv_set_frames_per_burst(freedv_data, n_frames_per_burst);
if 50 >= frametype >= 10:
if frame != 3 or force == True:
data_handler.arq_data_received(bytes(bytes_out[:-2])) # send payload data to arq checker without CRC16
#print("static.ARQ_RX_BURST_BUFFER.count(None) " + str(static.ARQ_RX_BURST_BUFFER.count(None)))
if static.ARQ_RX_BURST_BUFFER.count(None) <= 1:
logging.debug("FULL BURST BUFFER ---> UNSYNC")
self.c_lib.freedv_set_sync(freedv, 0)
else:
logging.critical("---------------------------SIMULATED MISSING FRAME")
force = True
# BURST ACK
elif frametype == 60:
logging.debug("ACK RECEIVED....")
data_handler.burst_ack_received()
# FRAME ACK
elif frametype == 61:
logging.debug("FRAME ACK RECEIVED....")
data_handler.frame_ack_received()
# FRAME RPT
elif frametype == 62:
logging.debug("REPEAT REQUEST RECEIVED....")
data_handler.burst_rpt_received(bytes_out[:-2])
# FRAME NAK
elif frametype == 63:
logging.debug("FRAME NAK RECEIVED....")
data_handler.frame_nack_received(bytes_out[:-2])
# CQ FRAME
elif frametype == 200:
logging.debug("CQ RECEIVED....")
data_handler.received_cq(bytes_out[:-2])
# PING FRAME
elif frametype == 210:
logging.debug("PING RECEIVED....")
data_handler.received_ping(bytes_out[:-2])
# PING ACK
elif frametype == 211:
logging.debug("PING ACK RECEIVED....")
data_handler.received_ping_ack(bytes_out[:-2])
# ARQ CONNECT
elif frametype == 220:
logging.info("ARQ CONNECT RECEIVED....")
data_handler.arq_received_connect(bytes_out[:-2])
# ARQ CONNECT ACK / KEEP ALIVE
elif frametype == 221:
logging.info("ARQ CONNECT ACK RECEIVED / KEEP ALIVE....")
data_handler.arq_received_connect_keep_alive(bytes_out[:-2])
# ARQ CONNECT ACK / KEEP ALIVE
elif frametype == 222:
logging.debug("ARQ DISCONNECT RECEIVED")
data_handler.arq_disconnect_received(bytes_out[:-2])
# ARQ FILE TRANSFER RECEIVED!
elif frametype == 225:
logging.debug("ARQ arq_received_data_channel_opener RECEIVED")
data_handler.arq_received_data_channel_opener(bytes_out[:-2])
# ARQ CHANNEL IS OPENED
elif frametype == 226:
logging.debug("ARQ arq_received_channel_is_open RECEIVED")
data_handler.arq_received_channel_is_open(bytes_out[:-2])
# ARQ CONNECT ACK / KEEP ALIVE
elif frametype == 230:
logging.debug("BEACON RECEIVED")
data_handler.received_beacon(bytes_out[:-2])
else:
logging.info("OTHER FRAME: " + str(bytes_out[:-2]))
print(frametype)
# DO UNSYNC AFTER LAST BURST by checking the frame nums against the total frames per burst
if frame == n_frames_per_burst:
logging.debug("LAST FRAME ---> UNSYNC")
self.c_lib.freedv_set_sync(freedv, 0) # FORCE UNSYNC
# clear bytes_out buffer to be ready for next frames after successfull decoding
#bytes_out = (ctypes.c_ubyte * bytes_per_frame)
#bytes_out = bytes_out() # get pointer to bytes_out
else:
# for debugging purposes to receive all data
pass
# print(bytes_out[:-2])
def get_scatter(self, freedv):
modemStats = MODEMSTATS()
self.c_lib.freedv_get_modem_extended_stats.restype = None
self.c_lib.freedv_get_modem_extended_stats(freedv, ctypes.byref(modemStats))
scatterdata = []
for i in range(MODEM_STATS_NC_MAX):
for j in range(MODEM_STATS_NR_MAX):
#check if odd or not to get every 2nd item for x
if (j % 2) == 0:
xsymbols = modemStats.rx_symbols[i][j]
ysymbols = modemStats.rx_symbols[i][j+1]
# check if value 0.0 or has real data
if xsymbols != 0.0 and ysymbols != 0.0:
scatterdata.append({"x" : xsymbols, "y" : ysymbols })
# only append scatter data if new data arrived
if len(scatterdata) > 0:
static.SCATTER = scatterdata
def calculate_ber(self, freedv):
Tbits = self.c_lib.freedv_get_total_bits(freedv)
Terrs = self.c_lib.freedv_get_total_bit_errors(freedv)
if Tbits != 0:
ber = (Terrs / Tbits) * 100
static.BER = int(ber)
self.c_lib.freedv_set_total_bit_errors(freedv, 0)
self.c_lib.freedv_set_total_bits(freedv, 0)
def calculate_snr(self, freedv):
modem_stats_snr = c_float()
modem_stats_sync = c_int()
self.c_lib.freedv_get_modem_stats(freedv,byref(modem_stats_sync), byref(modem_stats_snr))
modem_stats_snr = modem_stats_snr.value
try:
static.SNR = round(modem_stats_snr,1)
except:
static.SNR = 0
def get_radio_stats(self):
while True:
time.sleep(0.1)
static.HAMLIB_FREQUENCY = int(self.my_rig.get_freq())
(hamlib_mode, static.HAMLIB_BANDWITH) = self.my_rig.get_mode()
static.HAMLIB_MODE = Hamlib.rig_strrmode(hamlib_mode)
#static.HAMLIB_FREQUENCY = rigctld.get_frequency()
#static.HAMLIB_MODE = rigctld.get_mode()[0]
#static.HAMLIB_BANDWITH = rigctld.get_mode()[1]
def calculate_fft(self):
while True:
time.sleep(0.01)
# WE NEED TO OPTIMIZE THIS!
data_in = self.fft_data
# https://gist.github.com/ZWMiller/53232427efc5088007cab6feee7c6e4c
audio_data = np.fromstring(data_in, np.int16)
# Fast Fourier Transform, 10*log10(abs) is to scale it to dB
# and make sure it's not imaginary
try:
fftarray = np.fft.rfft(audio_data)
# set value 0 to 1 to avoid division by zero
fftarray[fftarray == 0] = 1
dfft = 10.*np.log10(abs(fftarray))
dfftlist = dfft.tolist()
# send fft only if receiving
if static.CHANNEL_STATE == 'RECEIVING_SIGNALLING' or static.CHANNEL_STATE == 'RECEIVING_DATA':
#static.FFT = dfftlist[20:100]
static.FFT = dfftlist
except:
print("setting fft = 0")
# else 0
static.FFT = [0] * 400
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