mirror of
https://github.com/DJ2LS/FreeDATA
synced 2024-05-14 08:04:33 +00:00
166 lines
5.9 KiB
Python
166 lines
5.9 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Created on Wed Dec 23 07:04:24 2020
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@author: DJ2LS
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"""
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import ctypes
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from ctypes import *
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import pathlib
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import pyaudio
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import sys
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import logging
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import time
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import threading
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import sys
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import argparse
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# --------------------------------------------GET PARAMETER INPUTS
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parser = argparse.ArgumentParser(description='Simons TEST TNC')
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parser.add_argument('--bursts', dest="N_BURSTS", default=0, type=int)
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parser.add_argument('--frames', dest="N_FRAMES_PER_BURST", default=0, type=int)
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parser.add_argument('--txmode', dest="FREEDV_TX_MODE", default=0, type=int)
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parser.add_argument('--rxmode', dest="FREEDV_RX_MODE", default=0, type=int)
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parser.add_argument('--audioinput', dest="AUDIO_INPUT", default=0, type=int)
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parser.add_argument('--audiooutput', dest="AUDIO_OUTPUT", default=0, type=int)
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parser.add_argument('--debug', dest="DEBUGGING_MODE", action="store_true")
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args, _ = parser.parse_known_args()
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N_BURSTS = args.N_BURSTS
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N_FRAMES_PER_BURST = args.N_FRAMES_PER_BURST
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AUDIO_OUTPUT_DEVICE = args.AUDIO_OUTPUT
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AUDIO_INPUT_DEVICE = args.AUDIO_INPUT
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FREEDV_TX_MODE = args.FREEDV_TX_MODE
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FREEDV_RX_MODE = args.FREEDV_RX_MODE
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DEBUGGING_MODE = args.DEBUGGING_MODE
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# 1024 good for mode 6
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AUDIO_FRAMES_PER_BUFFER = 2048
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MODEM_SAMPLE_RATE = 8000
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# -------------------------------------------- LOAD FREEDV
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libname = pathlib.Path().absolute() / "codec2/build_linux/src/libcodec2.so"
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c_lib = ctypes.CDLL(libname)
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# --------------------------------------------CREATE PYAUDIO INSTANCE
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p = pyaudio.PyAudio()
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# --------------------------------------------GET SUPPORTED SAMPLE RATES FROM SOUND DEVICE
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# AUDIO_SAMPLE_RATE_TX = int(p.get_device_info_by_index(AUDIO_OUTPUT_DEVICE)['defaultSampleRate'])
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# AUDIO_SAMPLE_RATE_RX = int(p.get_device_info_by_index(AUDIO_INPUT_DEVICE)['defaultSampleRate'])
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AUDIO_SAMPLE_RATE_TX = 8000
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AUDIO_SAMPLE_RATE_RX = 8000
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# --------------------------------------------OPEN AUDIO CHANNEL RX
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stream_tx = p.open(format=pyaudio.paInt16,
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channels=1,
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rate=AUDIO_SAMPLE_RATE_TX,
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frames_per_buffer=AUDIO_FRAMES_PER_BUFFER, # n_nom_modem_samples
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output=True,
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output_device_index=AUDIO_OUTPUT_DEVICE,
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)
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stream_rx = p.open(format=pyaudio.paInt16,
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channels=1,
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rate=AUDIO_SAMPLE_RATE_RX,
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frames_per_buffer=AUDIO_FRAMES_PER_BUFFER,
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input=True,
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input_device_index=AUDIO_INPUT_DEVICE,
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)
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# GENERAL PARAMETERS
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c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte)
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def send_pong(burst,n_total_burst,frame,n_total_frame):
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data_out = bytearray()
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data_out[:1] = bytes([burst])
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data_out[1:2] = bytes([n_total_burst])
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data_out[2:3] = bytes([frame])
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data_out[4:5] = bytes([n_total_frame])
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c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte)
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freedv = c_lib.freedv_open(FREEDV_TX_MODE)
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bytes_per_frame = int(c_lib.freedv_get_bits_per_modem_frame(freedv)/8)
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payload_per_frame = bytes_per_frame -2
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n_nom_modem_samples = c_lib.freedv_get_n_nom_modem_samples(freedv)
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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
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mod_out = ctypes.c_short * n_tx_modem_samples
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mod_out = mod_out()
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mod_out_preamble = ctypes.c_short * (1760*2) # 1760 for mode 10,11,12 #4000 for mode 9
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mod_out_preamble = mod_out_preamble()
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buffer = bytearray(payload_per_frame) # use this if CRC16 checksum is required ( DATA1-3)
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buffer[:len(data_out)] = data_out # set buffer size to length of data which will be sent
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crc = ctypes.c_ushort(c_lib.freedv_gen_crc16(bytes(buffer), payload_per_frame)) # generate CRC16
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crc = crc.value.to_bytes(2, byteorder='big') # convert crc to 2 byte hex string
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buffer += crc # append crc16 to buffer
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c_lib.freedv_rawdatapreambletx(freedv, mod_out_preamble);
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txbuffer = bytearray()
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txbuffer += bytes(mod_out_preamble)
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data = (ctypes.c_ubyte * bytes_per_frame).from_buffer_copy(buffer)
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c_lib.freedv_rawdatatx(freedv,mod_out,data) # modulate DATA and safe it into mod_out pointer
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txbuffer += bytes(mod_out)
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stream_tx.write(bytes(txbuffer))
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txbuffer = bytearray()
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# DATA CHANNEL INITIALISATION
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freedv = c_lib.freedv_open(FREEDV_RX_MODE)
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bytes_per_frame = int(c_lib.freedv_get_bits_per_modem_frame(freedv)/8)
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n_max_modem_samples = c_lib.freedv_get_n_max_modem_samples(freedv)
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bytes_out = (ctypes.c_ubyte * bytes_per_frame) # bytes_per_frame
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bytes_out = bytes_out() # get pointer from bytes_out
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receive = True
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while receive:
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time.sleep(0.01)
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data_in = b''
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nin = c_lib.freedv_nin(freedv)
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nin_converted = int(nin*(AUDIO_SAMPLE_RATE_RX/MODEM_SAMPLE_RATE))
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if DEBUGGING_MODE:
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print("-----------------------------")
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print(f"NIN: {str(nin)} [ {nin_converted} ]")
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data_in = stream_rx.read(nin_converted, exception_on_overflow = False)
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data_in = data_in.rstrip(b'\x00')
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c_lib.freedv_rawdatarx.argtype = [ctypes.POINTER(ctypes.c_ubyte), bytes_out, data_in] # check if really neccessary
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nbytes = c_lib.freedv_rawdatarx(freedv, bytes_out, data_in) # demodulate audio
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if DEBUGGING_MODE:
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print(f"SYNC: {str(c_lib.freedv_get_rx_status(freedv))}")
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if nbytes == bytes_per_frame:
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burst = bytes_out[0]
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n_total_burst = bytes_out[1]
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frame = bytes_out[2]
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n_total_frame = bytes_out[3]
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print(
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f"RX | BURST [{str(burst)}/{str(n_total_burst)}] FRAME [{str(frame)}/{str(n_total_frame)}] >>> SENDING PONG"
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)
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TRANSMIT_PONG = threading.Thread(target=send_pong, args=[burst,n_total_burst,frame,n_total_frame], name="SEND PONG")
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TRANSMIT_PONG.start()
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c_lib.freedv_set_sync(freedv,0)
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