mirror of
https://github.com/DJ2LS/FreeDATA
synced 2024-05-14 08:04:33 +00:00
141 lines
4.5 KiB
Python
141 lines
4.5 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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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 time
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import threading
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import audioop
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import argparse
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import sys
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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('--delay', dest="DELAY_BETWEEN_BURSTS", default=0, type=int)
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parser.add_argument('--mode', dest="FREEDV_MODE", default=0, type=int)
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parser.add_argument('--output', dest="DATA_OUTPUT", type=str)
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parser.add_argument('--audiooutput', dest="AUDIO_OUTPUT", default=0, type=int)
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args = parser.parse_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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DELAY_BETWEEN_BURSTS = args.DELAY_BETWEEN_BURSTS/1000
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DATA_OUTPUT = args.DATA_OUTPUT
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AUDIO_OUTPUT_DEVICE = args.AUDIO_OUTPUT
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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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mode = args.FREEDV_MODE
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data_out = b'HELLO WORLD!'
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print(N_BURSTS, file=sys.stderr)
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print(N_FRAMES_PER_BURST, file=sys.stderr)
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#-------------------------------------------- LOAD FREEDV
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libname = "libcodec2.so"
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c_lib = ctypes.CDLL(libname)
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#--------------------------------------------CREATE PYAUDIO INSTANCE
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#--------------------------------------------GET SUPPORTED SAMPLE RATES FROM SOUND DEVICE
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#--------------------------------------------OPEN AUDIO CHANNEL TX
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if DATA_OUTPUT == "audio":
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p = pyaudio.PyAudio()
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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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AUDIO_SAMPLE_RATE_TX = int(p.get_device_info_by_index(AUDIO_OUTPUT_DEVICE)['defaultSampleRate'])
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c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte)
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freedv = c_lib.freedv_open(mode)
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bytes_per_frame = int(c_lib.freedv_get_bits_per_modem_frame(freedv)/8)
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payload_bytes_per_frame = bytes_per_frame -2
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n_mod_out = int(c_lib.freedv_get_n_tx_modem_samples(freedv))
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mod_out = ctypes.c_short * n_mod_out
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mod_out = mod_out()
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n_preamble = int(c_lib.freedv_get_n_tx_preamble_modem_samples(freedv))
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mod_out_preamble = ctypes.c_short * n_preamble
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mod_out_preamble = mod_out_preamble()
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n_postamble = int(c_lib.freedv_get_n_tx_postamble_modem_samples(freedv))
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mod_out_postamble = ctypes.c_short * n_postamble
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mod_out_postamble = mod_out_postamble()
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buffer = bytearray(payload_bytes_per_frame) # use this if CRC16 checksum is required ( DATA1-3)
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buffer[:len(data_out)] = data_out # set buffersize to length of data which will be send
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crc = ctypes.c_ushort(c_lib.freedv_gen_crc16(bytes(buffer), payload_bytes_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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print("BURSTS: " + str(N_BURSTS) + " FRAMES: " + str(N_FRAMES_PER_BURST) , file=sys.stderr)
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for i in range(0,N_BURSTS):
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txbuffer = bytearray()
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c_lib.freedv_rawdatapreambletx(freedv, mod_out_preamble)
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txbuffer += bytes(mod_out_preamble)
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for n in range(0,N_FRAMES_PER_BURST):
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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 save it into mod_out pointer
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txbuffer += bytes(mod_out)
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c_lib.freedv_rawdatapostambletx(freedv, mod_out_postamble)
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txbuffer += bytes(mod_out_postamble)
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inter_burst_delay_ms = 200
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samples_delay = int(MODEM_SAMPLE_RATE*inter_burst_delay_ms/1000)
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mod_out_silence = ctypes.c_short * samples_delay
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mod_out_silence = mod_out_silence()
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txbuffer += bytes(mod_out_silence)
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if DATA_OUTPUT == "audio":
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audio = audioop.ratecv(txbuffer,2,1,MODEM_SAMPLE_RATE, AUDIO_SAMPLE_RATE_TX, None)
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stream_tx.write(audio[0])
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txbuffer = bytearray()
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else:
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sys.stdout.buffer.write(txbuffer) # print data to terminal for piping the output to other programs
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sys.stdout.flush()
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txbuffer = bytearray()
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if DATA_OUTPUT == "audio":
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stream_tx.close()
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p.terminate()
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