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FreeDATA/tnc/modem.py
DJ2LS 68d0e70a61
reset sock connection on decoding error
2021-09-08 18:23:26 +02:00

678 lines
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Python
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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 helpers
import static
import data_handler
import sys
sys.path.append("hamlib/linux")
import Hamlib
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()
# --------------------------------------------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
FREEDV_DECODER_THREAD_10 = threading.Thread(target=self.receive, args=[10], name="FREEDV_DECODER_THREAD_10")
FREEDV_DECODER_THREAD_10.start()
#FREEDV_DECODER_THREAD_11 = threading.Thread(target=self.receive, args=[11], name="FREEDV_DECODER_THREAD_11")
#FREEDV_DECODER_THREAD_11.start()
FREEDV_DECODER_THREAD_12 = threading.Thread(target=self.receive, args=[12], name="FREEDV_DECODER_THREAD_12")
FREEDV_DECODER_THREAD_12.start()
FREEDV_DECODER_THREAD_14 = threading.Thread(target=self.receive, args=[static.FREEDV_SIGNALLING_MODE], name="FREEDV_DECODER_THREAD_14")
FREEDV_DECODER_THREAD_14.start()
FREEDV_PLAYBACK_THREAD = threading.Thread(target=self.play_audio, name="FREEDV_DECODER_THREAD_14")
FREEDV_PLAYBACK_THREAD.start()
# --------------------------------------------CONFIGURE HAMLIB
# try to init hamlib
try:
Hamlib.rig_set_debug(Hamlib.RIG_DEBUG_NONE)
self.my_rig = Hamlib.Rig(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("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")
self.my_rig.set_conf("serial_handshake", "None")
self.my_rig.set_conf("stop_bits", "1")
self.my_rig.set_conf("data_bits", "8")
#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)
if static.HAMLIB_PTT_TYPE == 'RIG_PTT_RIG':
self.hamlib_ptt_type = Hamlib.RIG_PTT_RIG
elif static.HAMLIB_PTT_TYPE == 'RIG_PTT_SERIAL_DTR':
self.hamlib_ptt_type = Hamlib.RIG_PTT_SERIAL_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 == 'RIG_PTT_PARALLEL':
self.hamlib_ptt_type = Hamlib.RIG_PTT_PARALLEL
elif static.HAMLIB_PTT_TYPE == 'RIG_PTT_RIG_MICDATA':
self.hamlib_ptt_type = Hamlib.RIG_PTT_RIG_MICDATA
elif static.HAMLIB_PTT_TYPE == 'RIG_PTT_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()
except:
print("Unexpected error:", sys.exc_info()[0])
print("can't open rig")
# --------------------------------------------------------------------------------------------------------
def ptt_and_wait(self, state):
if state:
static.PTT_STATE = True
self.my_rig.set_ptt(self.hamlib_ptt_type, 1)
#rigctld.ptt_enable()
ptt_togle_timeout = time.time() + 0.1
while time.time() < ptt_togle_timeout:
pass
else:
ptt_togle_timeout = time.time() + 0.5
while time.time() < ptt_togle_timeout:
pass
static.PTT_STATE = False
self.my_rig.set_ptt(self.hamlib_ptt_type, 0)
#rigctld.ptt_disable()
def play_audio(self):
while True:
time.sleep(0.01)
while len(self.streambuffer) > 0:
time.sleep(0.01)
if len(self.streambuffer) > 0:
self.audio_writing_to_stream = True
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)
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'
self.ptt_and_wait(True)
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
self.ptt_and_wait(True)
# 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, mode):
force = False
# create new codec2 instance
self.c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte)
freedv = self.c_lib.freedv_open(mode)
bytes_per_frame = int(self.c_lib.freedv_get_bits_per_modem_frame(freedv) / 8)
if mode == static.FREEDV_SIGNALLING_MODE:
static.FREEDV_SIGNALLING_BYTES_PER_FRAME = bytes_per_frame
static.FREEDV_SIGNALLING_PAYLOAD_PER_FRAME = bytes_per_frame - 2
self.c_lib.freedv_set_frames_per_burst(freedv, 1)
elif 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)
bytes_out = (ctypes.c_ubyte * bytes_per_frame)
bytes_out = bytes_out() # get pointer to bytes_out
while static.FREEDV_RECEIVE == True:
time.sleep(0.01)
# lets get the frequency, mode and bandwith
self.get_radio_stats()
# lets get scatter data
self.get_scatter(freedv)
# demod loop
while (static.CHANNEL_STATE == 'RECEIVING_DATA' and static.ARQ_DATA_CHANNEL_MODE == mode) or (static.CHANNEL_STATE == 'RECEIVING_SIGNALLING' and static.FREEDV_SIGNALLING_MODE == mode):
time.sleep(0.01)
# 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
nin = self.c_lib.freedv_nin(freedv)
nin = int(nin*(static.AUDIO_SAMPLE_RATE_RX/static.MODEM_SAMPLE_RATE))
data_in = self.stream_rx.read(nin, exception_on_overflow=False)
data_in = audioop.ratecv(data_in,2,1,static.AUDIO_SAMPLE_RATE_RX, static.MODEM_SAMPLE_RATE, None)
data_in = data_in[0]
self.calculate_fft(data_in)
static.AUDIO_RMS = audioop.rms(data_in, 2)
nbytes = self.c_lib.freedv_rawdatarx(freedv, bytes_out, data_in) # demodulate audio
#print("listening-" + str(mode) + " - " + "nin: " + str(nin) + " - " + str(self.c_lib.freedv_get_rx_status(freedv)))
# get scatter data and snr data
self.get_scatter(freedv)
self.calculate_snr(freedv)
# 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
if nbytes == bytes_per_frame and 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':
self.calculate_snr(freedv)
#static.SCATTER = []
# 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 agains the total frames per burst
if frame == n_frames_per_burst:
logging.debug("LAST FRAME ---> UNSYNC")
bytes_out = (ctypes.c_ubyte * bytes_per_frame)
bytes_out = bytes_out() # get pointer to bytes_out
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):
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, data_in):
# 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
# we need to try this in case of division by zero
try:
dfft = 10.*np.log10(abs(np.fft.rfft(audio_data)))
except:
dfft = 0
dfftlist = dfft.tolist()
# send fft only if receiving
if static.CHANNEL_STATE == 'RECEIVING_SIGNALLING' or static.CHANNEL_STATE == 'RECEIVING_DATA':
static.FFT = dfftlist[20:380]
# else send 0
else:
static.FFT = [0] * 400
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