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FreeDATA/modem.py
DJ2LS cbdbd30c39
selective repeating 
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2021-03-09 11:05:59 +01:00

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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 helpers
import static
import data_handler
import Hamlib
class RF():
def __init__(self):
#-------------------------------------------- LOAD FREEDV
libname = pathlib.Path().absolute() / "codec2/build_linux/src/libcodec2.so"
self.c_lib = ctypes.CDLL(libname)
#--------------------------------------------CREATE PYAUDIO INSTANCE
self.p = pyaudio.PyAudio()
#--------------------------------------------GET SUPPORTED SAMPLE RATES FROM SOUND DEVICE
#static.AUDIO_SAMPLE_RATE_RX = int(self.p.get_device_info_by_index(static.AUDIO_INPUT_DEVICE)['defaultSampleRate'])
#static.AUDIO_SAMPLE_RATE_TX = int(self.p.get_device_info_by_index(static.AUDIO_OUTPUT_DEVICE)['defaultSampleRate'])
static.AUDIO_SAMPLE_RATE_TX = 8000
static.AUDIO_SAMPLE_RATE_RX = 8000
#--------------------------------------------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
)
#--------------------------------------------START DECODER THREAD
FREEDV_DECODER_THREAD_10 = threading.Thread(target=self.receive, args=[10], name="FREEDV_DECODER_THREAD")
FREEDV_DECODER_THREAD_10.start()
FREEDV_DECODER_THREAD_11 = threading.Thread(target=self.receive, args=[11], name="FREEDV_DECODER_THREAD")
FREEDV_DECODER_THREAD_11.start()
FREEDV_DECODER_THREAD_12 = threading.Thread(target=self.receive, args=[12], name="FREEDV_DECODER_THREAD")
FREEDV_DECODER_THREAD_12.start()
FREEDV_DECODER_THREAD_14 = threading.Thread(target=self.receive, args=[static.FREEDV_SIGNALLING_MODE], name="FREEDV_DECODER_THREAD")
FREEDV_DECODER_THREAD_14.start()
#--------------------------------------------CONFIGURE HAMLIB
Hamlib.rig_set_debug(Hamlib.RIG_DEBUG_NONE)
# Init RIG_MODEL_DUMMY
self.my_rig = Hamlib.Rig(Hamlib.RIG_MODEL_DUMMY)
self.my_rig.set_conf("rig_pathname", "/dev/Rig")
self.my_rig.set_conf("retry", "5")
self.my_rig.open ()
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 == 'RIG_PTT_SERIAL_RTS':
self.hamlib_ptt_type = Hamlib.RIG_PTT_SERIAL_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.set_ptt(self.hamlib_ptt_type,0)
#--------------------------------------------------------------------------------------------------------
def transmit_signalling(self,ack_buffer):
#print(ack_buffer)
#static.ARQ_STATE = 'SENDING_ACK'
state_before_transmit = static.CHANNEL_STATE
static.CHANNEL_STATE = 'SENDING_SIGNALLING'
static.PTT_STATE = True
self.my_rig.set_ptt(self.hamlib_ptt_type,1)
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)
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()
buffer = bytearray(payload_per_frame) # use this if CRC16 checksum is required ( DATA1-3)
buffer[:len(ack_buffer)] = ack_buffer # 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
txbuffer = bytearray()
txbuffer += bytes(mod_out_preamble)
txbuffer += bytes(mod_out)
# -------------- transmit audio twice
logging.debug("SEND SIGNALLING FRAME " + str(ack_buffer))
self.stream_tx.write(bytes(txbuffer))
self.my_rig.set_ptt(self.hamlib_ptt_type,0)
static.PTT_STATE = False
static.CHANNEL_STATE = state_before_transmit
#static.CHANNEL_STATE = 'RECEIVING_SIGNALLING'
#static.ARQ_STATE = 'RECEIVING_DATA'
time.sleep(0.5)
#--------------------------------------------------------------------------------------------------------
# GET ARQ BURST FRAME VOM BUFFER AND MODULATE IT
async def transmit_arq_burst(self):
self.my_rig.set_ptt(self.hamlib_ptt_type,1)
static.PTT_STATE = True
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.FREEDV_DATA_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)
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()
self.c_lib.freedv_rawdatapreambletx(freedv, mod_out_preamble);
txbuffer = bytearray()
txbuffer += bytes(mod_out_preamble)
if static.ARQ_RPT_RECEIVED == False:
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.to_bytes(2, byteorder='big')
arqframe = frame_type + \
bytes([static.ARQ_TX_N_FRAMES_PER_BURST]) + \
static.ARQ_TX_N_CURRENT_ARQ_FRAME + \
static.ARQ_TX_N_TOTAL_ARQ_FRAMES + \
static.DXCALLSIGN_CRC8 + \
static.MYCALLSIGN_CRC8 + \
payload_data
#print(arqframe)
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
txbuffer += bytes(mod_out)
elif static.ARQ_RPT_RECEIVED == True:
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])
payload_data = bytes(static.TX_BUFFER[static.ARQ_N_SENT_FRAMES + missing_frame - 1])
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.to_bytes(2, byteorder='big')
arqframe = frame_type + \
bytes([static.ARQ_TX_N_FRAMES_PER_BURST]) + \
static.ARQ_TX_N_CURRENT_ARQ_FRAME + \
static.ARQ_TX_N_TOTAL_ARQ_FRAMES + \
static.DXCALLSIGN_CRC8 + \
static.MYCALLSIGN_CRC8 + \
payload_data
#print(arqframe)
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
txbuffer += bytes(mod_out)
# -------------- transmit audio
self.stream_tx.write(bytes(txbuffer))
#static.ARQ_STATE = 'IDLE'
static.CHANNEL_STATE = 'RECEIVING_SIGNALLING'
static.PTT_STATE = False
self.my_rig.set_ptt(self.hamlib_ptt_type,0)
#--------------------------------------------------------------------------------------------------------
def receive(self,mode):
force = True
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
bytes_out = (ctypes.c_ubyte * bytes_per_frame)
bytes_out = bytes_out() #get pointer to bytes_out
while static.FREEDV_RECEIVE == True:
time.sleep(0.05)
# stuck in sync counter
stuck_in_sync_counter = 0
stuck_in_sync_10_counter = 0
#
# here we do an unsync to be sure, the modem is in idle state and ready for new data
self.c_lib.freedv_set_sync(freedv, 0)
# here we do a buffer cleanup before returning to demod loop
dummy_mod = bytes(self.c_lib.freedv_nin(freedv))
self.c_lib.freedv_rawdatarx(freedv, bytes_out, dummy_mod)
#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
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)
#print(audioop.rms(data_in, 2))
#self.c_lib.freedv_rawdatarx.argtype = [ctypes.POINTER(ctypes.c_ubyte), data_bytes_out, data_in] # check if really neccessary
nbytes = self.c_lib.freedv_rawdatarx(freedv, bytes_out, data_in) # demodulate audio
#logging.debug(self.c_lib.freedv_get_rx_status(freedv))
#print("listening-" + str(mode) + "-" + str(self.c_lib.freedv_get_rx_status(freedv)))
#-------------STUCK IN SYNC DETECTOR
stuck_in_sync_counter += 1
if self.c_lib.freedv_get_rx_status(freedv) == 10:
stuck_in_sync_10_counter += 1
self.c_lib.freedv_set_sync(freedv, 0)
logging.warning("MODEM | SYNC 10 TRIGGER | M:" + str(mode))
if stuck_in_sync_counter == 33 and self.c_lib.freedv_get_rx_status(freedv) == 10:
logging.critical("MODEM | stuck in sync #1")
self.c_lib.freedv_set_sync(freedv, 0) #FORCE UNSYNC
stuck_in_sync_counter = 0
stuck_in_sync_10_counter = 0
if stuck_in_sync_counter >= 66 and stuck_in_sync_10_counter >= 2:
logging.critical("MODEM | stuck in sync #2")
self.c_lib.freedv_set_sync(freedv, 0) #FORCE UNSYNC
stuck_in_sync_counter = 0
stuck_in_sync_10_counter = 0
#-----------------------------------
# forward data only if broadcast or we are the receiver
if nbytes == bytes_per_frame and bytes(bytes_out[1:2]) == static.MYCALLSIGN_CRC8 or bytes(bytes_out[1:2]) == b'\x01':
self.calculate_ber(freedv)
# counter reset for stuck in sync counter
stuck_in_sync_counter = 0
stuck_in_sync_10_counter = 0
#
# 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])
# 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.debug("ARQ CONNECT RECEIVED....")
data_handler.arq_received_connect(bytes_out[:-2])
# ARQ CONNECT ACK / KEEP ALIVE
elif frametype == 221:
logging.debug("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")
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")
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
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)
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