mirror of
https://github.com/DJ2LS/FreeDATA
synced 2024-05-14 08:04:33 +00:00
124 lines
3.7 KiB
Python
124 lines
3.7 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 audioop
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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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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('--mode', dest="FREEDV_MODE", type=str, choices=['datac0', 'datac1', 'datac3'])
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parser.add_argument('--audioinput', dest="AUDIO_INPUT", 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_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_INPUT_DEVICE = args.AUDIO_INPUT
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MODE = codec2.FREEDV_MODE[args.FREEDV_MODE].value
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DEBUGGING_MODE = args.DEBUGGING_MODE
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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_INPUT_DEVICE != 0:
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p = pyaudio.PyAudio()
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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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# ----------------------------------------------------------------
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# DATA CHANNEL INITIALISATION
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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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n_max_modem_samples = codec2.api.freedv_get_n_max_modem_samples(freedv)
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bytes_out = create_string_buffer(bytes_per_frame * 2)
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codec2.api.freedv_set_frames_per_burst(freedv,N_FRAMES_PER_BURST)
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total_n_bytes = 0
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rx_total_frames = 0
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rx_frames = 0
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rx_bursts = 0
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timeout = time.time() + 10
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receive = True
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while receive and time.time() < timeout:
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data_in = b''
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if AUDIO_INPUT_DEVICE != 0:
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nin = codec2.api.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 == True:
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print(f"NIN: {nin} [{nin_converted}]", file=sys.stderr)
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data_in = stream_rx.read(nin_converted, exception_on_overflow = False)
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data_in = audioop.ratecv(data_in,2,1,AUDIO_SAMPLE_RATE_RX, MODEM_SAMPLE_RATE, None)
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data_in = data_in[0].rstrip(b'\x00')
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else:
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nin = codec2.api.freedv_nin(freedv) * 2
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data_in = sys.stdin.buffer.read(nin)
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nbytes = codec2.api.freedv_rawdatarx(freedv, bytes_out, data_in) # demodulate audio
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total_n_bytes = total_n_bytes + nbytes
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if DEBUGGING_MODE == True:
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print(f"SYNC: {codec2.api.freedv_get_rx_status(freedv)}", file=sys.stderr)
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if nbytes == bytes_per_frame:
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rx_total_frames = rx_total_frames + 1
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rx_frames = rx_frames + 1
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if rx_frames == N_FRAMES_PER_BURST:
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rx_frames = 0
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rx_bursts = rx_bursts + 1
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if rx_bursts == N_BURSTS:
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receive = False
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print(f"RECEIVED BURSTS: {rx_bursts} RECEIVED FRAMES: {rx_total_frames}", file=sys.stderr)
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# and at last check if we had an openend pyaudio instance and close it
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if AUDIO_INPUT_DEVICE != 0:
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stream_tx.close()
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p.terminate()
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