mirror of
https://github.com/DJ2LS/FreeDATA
synced 2024-05-14 08:04:33 +00:00
142 lines
5 KiB
Python
142 lines
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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sys.path.insert(0,'..')
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import codec2
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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('--framesperburst', 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", type=str, choices=['datac0', 'datac1', 'datac3'])
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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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AUDIO_OUTPUT_DEVICE = args.AUDIO_OUTPUT
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if args.FREEDV_MODE == "datac0":
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MODE = codec2.api.FREEDV_MODE_DATAC0
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if args.FREEDV_MODE == "datac1":
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MODE = codec2.api.FREEDV_MODE_DATAC1
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if args.FREEDV_MODE == "datac1":
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MODE = codec2.api.FREEDV_MODE_DATAC3
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# AUDIO PARAMETERS
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AUDIO_FRAMES_PER_BUFFER = 2048
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MODEM_SAMPLE_RATE = codec2.api.FREEDV_FS_8000
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AUDIO_SAMPLE_RATE_TX = 48000
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# check if we want to use an audio device then do an pyaudio init
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if AUDIO_OUTPUT_DEVICE != 0:
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# pyaudio init
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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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# data binary string
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data_out = b'HELLO WORLD!'
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# ----------------------------------------------------------------
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# open codec2 instance
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freedv = cast(codec2.api.freedv_open(MODE), c_void_p)
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# get number of bytes per frame for mode
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bytes_per_frame = int(codec2.api.freedv_get_bits_per_modem_frame(freedv)/8)
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payload_bytes_per_frame = bytes_per_frame -2
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# init buffer for data
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n_tx_modem_samples = codec2.api.freedv_get_n_tx_modem_samples(freedv)
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mod_out = create_string_buffer(n_tx_modem_samples * 2)
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# init buffer for preample
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n_tx_preamble_modem_samples = codec2.api.freedv_get_n_tx_preamble_modem_samples(freedv)
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mod_out_preamble = create_string_buffer(n_tx_preamble_modem_samples * 2)
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# init buffer for postamble
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n_tx_postamble_modem_samples = codec2.api.freedv_get_n_tx_postamble_modem_samples(freedv)
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mod_out_postamble = create_string_buffer(n_tx_postamble_modem_samples * 2)
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# create buffer for data
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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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# create crc for data frame - we are using the crc function shipped with codec2 to avoid
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# crc algorithm incompatibilities
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crc = ctypes.c_ushort(codec2.api.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(f"TOTAL BURSTS: {N_BURSTS} TOTAL FRAMES_PER_BURST: {N_FRAMES_PER_BURST}", file=sys.stderr)
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for i in range(1,N_BURSTS+1):
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# write preamble to txbuffer
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codec2.api.freedv_rawdatapreambletx(freedv, mod_out_preamble)
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txbuffer = bytes(mod_out_preamble)
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# create modulaton for N = FRAMESPERBURST and append it to txbuffer
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for n in range(1,N_FRAMES_PER_BURST+1):
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data = (ctypes.c_ubyte * bytes_per_frame).from_buffer_copy(buffer)
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codec2.api.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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print(f"BURST: {i}/{N_BURSTS} FRAME: {n}/{N_FRAMES_PER_BURST}", file=sys.stderr)
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# append postamble to txbuffer
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codec2.api.freedv_rawdatapostambletx(freedv, mod_out_postamble)
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txbuffer += bytes(mod_out_postamble)
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# append a delay between bursts as audio silence
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samples_delay = int(MODEM_SAMPLE_RATE*DELAY_BETWEEN_BURSTS)
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mod_out_silence = create_string_buffer(samples_delay)
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txbuffer += bytes(mod_out_silence)
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print(f"samples_delay: {samples_delay} DELAY_BETWEEN_BURSTS: {DELAY_BETWEEN_BURSTS}", file=sys.stderr)
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# check if we want to use an audio device or stdout
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if AUDIO_OUTPUT_DEVICE != 0:
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# sample rate conversion from 8000Hz to 48000Hz
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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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else:
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# print data to terminal for piping the output to other programs
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sys.stdout.buffer.write(txbuffer)
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sys.stdout.flush()
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# and at last check if we had an openend pyaudio instance and close it
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if AUDIO_OUTPUT_DEVICE != 0:
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stream_tx.close()
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p.terminate()
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