mirror of
https://github.com/DJ2LS/FreeDATA
synced 2024-05-14 08:04:33 +00:00
164 lines
6 KiB
Python
164 lines
6 KiB
Python
#!/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 sys
|
|
import logging
|
|
import time
|
|
import threading
|
|
import sys
|
|
import argparse
|
|
|
|
# --------------------------------------------GET PARAMETER INPUTS
|
|
parser = argparse.ArgumentParser(description='Simons TEST TNC')
|
|
parser.add_argument('--bursts', dest="N_BURSTS", default=0, type=int)
|
|
parser.add_argument('--frames', dest="N_FRAMES_PER_BURST", default=0, type=int)
|
|
parser.add_argument('--txmode', dest="FREEDV_TX_MODE", default=0, type=int)
|
|
parser.add_argument('--rxmode', dest="FREEDV_RX_MODE", default=0, type=int)
|
|
parser.add_argument('--audioinput', dest="AUDIO_INPUT", default=0, type=int)
|
|
parser.add_argument('--audiooutput', dest="AUDIO_OUTPUT", default=0, type=int)
|
|
parser.add_argument('--debug', dest="DEBUGGING_MODE", action="store_true")
|
|
|
|
args, _ = parser.parse_known_args()
|
|
|
|
N_BURSTS = args.N_BURSTS
|
|
N_FRAMES_PER_BURST = args.N_FRAMES_PER_BURST
|
|
|
|
AUDIO_OUTPUT_DEVICE = args.AUDIO_OUTPUT
|
|
AUDIO_INPUT_DEVICE = args.AUDIO_INPUT
|
|
|
|
FREEDV_TX_MODE = args.FREEDV_TX_MODE
|
|
FREEDV_RX_MODE = args.FREEDV_RX_MODE
|
|
|
|
DEBUGGING_MODE = args.DEBUGGING_MODE
|
|
|
|
# 1024 good for mode 6
|
|
AUDIO_FRAMES_PER_BUFFER = 2048
|
|
MODEM_SAMPLE_RATE = 8000
|
|
|
|
# -------------------------------------------- LOAD FREEDV
|
|
libname = pathlib.Path().absolute() / "codec2/build_linux/src/libcodec2.so"
|
|
c_lib = ctypes.CDLL(libname)
|
|
# --------------------------------------------CREATE PYAUDIO INSTANCE
|
|
p = pyaudio.PyAudio()
|
|
# --------------------------------------------GET SUPPORTED SAMPLE RATES FROM SOUND DEVICE
|
|
|
|
# AUDIO_SAMPLE_RATE_TX = int(p.get_device_info_by_index(AUDIO_OUTPUT_DEVICE)['defaultSampleRate'])
|
|
# AUDIO_SAMPLE_RATE_RX = int(p.get_device_info_by_index(AUDIO_INPUT_DEVICE)['defaultSampleRate'])
|
|
AUDIO_SAMPLE_RATE_TX = 8000
|
|
AUDIO_SAMPLE_RATE_RX = 8000
|
|
# --------------------------------------------OPEN AUDIO CHANNEL RX
|
|
|
|
stream_tx = p.open(format=pyaudio.paInt16,
|
|
channels=1,
|
|
rate=AUDIO_SAMPLE_RATE_TX,
|
|
frames_per_buffer=AUDIO_FRAMES_PER_BUFFER, # n_nom_modem_samples
|
|
output=True,
|
|
output_device_index=AUDIO_OUTPUT_DEVICE,
|
|
)
|
|
|
|
stream_rx = p.open(format=pyaudio.paInt16,
|
|
channels=1,
|
|
rate=AUDIO_SAMPLE_RATE_RX,
|
|
frames_per_buffer=AUDIO_FRAMES_PER_BUFFER,
|
|
input=True,
|
|
input_device_index=AUDIO_INPUT_DEVICE,
|
|
)
|
|
|
|
|
|
# GENERAL PARAMETERS
|
|
c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte)
|
|
|
|
|
|
def send_pong(burst,n_total_burst,frame,n_total_frame):
|
|
|
|
data_out = bytearray()
|
|
data_out[0:1] = bytes([burst])
|
|
data_out[1:2] = bytes([n_total_burst])
|
|
data_out[2:3] = bytes([frame])
|
|
data_out[4:5] = bytes([n_total_frame])
|
|
|
|
|
|
|
|
c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte)
|
|
freedv = c_lib.freedv_open(FREEDV_TX_MODE)
|
|
bytes_per_frame = int(c_lib.freedv_get_bits_per_modem_frame(freedv)/8)
|
|
payload_per_frame = bytes_per_frame -2
|
|
n_nom_modem_samples = c_lib.freedv_get_n_nom_modem_samples(freedv)
|
|
n_tx_modem_samples = c_lib.freedv_get_n_tx_modem_samples(freedv) # get n_tx_modem_samples which defines the size of the modulation object # --> *2
|
|
|
|
mod_out = ctypes.c_short * n_tx_modem_samples
|
|
mod_out = mod_out()
|
|
mod_out_preamble = ctypes.c_short * (1760*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(data_out)] = data_out # set buffer size to length of data which will be sent
|
|
|
|
crc = ctypes.c_ushort(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
|
|
|
|
c_lib.freedv_rawdatapreambletx(freedv, mod_out_preamble);
|
|
txbuffer = bytearray()
|
|
txbuffer += bytes(mod_out_preamble)
|
|
|
|
data = (ctypes.c_ubyte * bytes_per_frame).from_buffer_copy(buffer)
|
|
c_lib.freedv_rawdatatx(freedv,mod_out,data) # modulate DATA and safe it into mod_out pointer
|
|
|
|
txbuffer += bytes(mod_out)
|
|
stream_tx.write(bytes(txbuffer))
|
|
|
|
txbuffer = bytearray()
|
|
|
|
|
|
|
|
# DATA CHANNEL INITIALISATION
|
|
|
|
freedv = c_lib.freedv_open(FREEDV_RX_MODE)
|
|
bytes_per_frame = int(c_lib.freedv_get_bits_per_modem_frame(freedv)/8)
|
|
n_max_modem_samples = c_lib.freedv_get_n_max_modem_samples(freedv)
|
|
bytes_out = (ctypes.c_ubyte * bytes_per_frame) # bytes_per_frame
|
|
bytes_out = bytes_out() # get pointer from bytes_out
|
|
|
|
receive = True
|
|
while receive:
|
|
time.sleep(0.01)
|
|
|
|
data_in = b''
|
|
|
|
nin = c_lib.freedv_nin(freedv)
|
|
nin_converted = int(nin*(AUDIO_SAMPLE_RATE_RX/MODEM_SAMPLE_RATE))
|
|
if DEBUGGING_MODE:
|
|
print("-----------------------------")
|
|
print("NIN: " + str(nin) + " [ " + str(nin_converted) + " ]")
|
|
|
|
data_in = stream_rx.read(nin_converted, exception_on_overflow = False)
|
|
data_in = data_in.rstrip(b'\x00')
|
|
|
|
c_lib.freedv_rawdatarx.argtype = [ctypes.POINTER(ctypes.c_ubyte), bytes_out, data_in] # check if really neccessary
|
|
nbytes = c_lib.freedv_rawdatarx(freedv, bytes_out, data_in) # demodulate audio
|
|
|
|
if DEBUGGING_MODE:
|
|
print("SYNC: " + str(c_lib.freedv_get_rx_status(freedv)))
|
|
|
|
if nbytes == bytes_per_frame:
|
|
|
|
burst = bytes_out[0]
|
|
n_total_burst = bytes_out[1]
|
|
frame = bytes_out[2]
|
|
n_total_frame = bytes_out[3]
|
|
print("RX | BURST [" + str(burst) + "/" + str(n_total_burst) + "] FRAME [" + str(frame) + "/" + str(n_total_frame) + "] >>> SENDING PONG")
|
|
|
|
TRANSMIT_PONG = threading.Thread(target=send_pong, args=[burst,n_total_burst,frame,n_total_frame], name="SEND PONG")
|
|
TRANSMIT_PONG.start()
|
|
|
|
c_lib.freedv_set_sync(freedv,0)
|