FreeDATA/test/test_tx.py

218 lines
7 KiB
Python

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import argparse
import ctypes
import sys
import numpy as np
import sounddevice as sd
sys.path.insert(0, "..")
from tnc import codec2
def test_tx():
args = parse_arguments()
if args.LIST:
devices = sd.query_devices(device=None, kind=None)
for index, device in enumerate(devices):
print(f"{index} {device['name']}")
sd._terminate()
sys.exit()
N_BURSTS = args.N_BURSTS
N_FRAMES_PER_BURST = args.N_FRAMES_PER_BURST
DELAY_BETWEEN_BURSTS = args.DELAY_BETWEEN_BURSTS / 1000
AUDIO_OUTPUT_DEVICE = args.AUDIO_OUTPUT_DEVICE
MODE = codec2.FREEDV_MODE[args.FREEDV_MODE].value
# AUDIO PARAMETERS
AUDIO_FRAMES_PER_BUFFER = 2400
MODEM_SAMPLE_RATE = codec2.api.FREEDV_FS_8000
AUDIO_SAMPLE_RATE_TX = 48000
assert (AUDIO_SAMPLE_RATE_TX % MODEM_SAMPLE_RATE) == 0
# check if we want to use an audio device then do a pyaudio init
if AUDIO_OUTPUT_DEVICE != -1:
# auto search for loopback devices
if AUDIO_OUTPUT_DEVICE == -2:
loopback_list = []
devices = sd.query_devices(device=None, kind=None)
for index, device in enumerate(devices):
if "Loopback: PCM" in device["name"]:
print(index)
loopback_list.append(index)
if loopback_list:
# 0 = RX 1 = TX
AUDIO_OUTPUT_DEVICE = loopback_list[-1]
print(f"loopback_list tx: {loopback_list}", file=sys.stderr)
else:
print("not enough audio loopback devices ready...")
print("you should wait about 30 seconds...")
sd._terminate()
sys.exit()
print(f"AUDIO OUTPUT DEVICE: {AUDIO_OUTPUT_DEVICE}", file=sys.stderr)
# audio stream init
stream_tx = sd.RawStream(
channels=1,
dtype="int16",
device=(0, AUDIO_OUTPUT_DEVICE),
samplerate=AUDIO_SAMPLE_RATE_TX,
blocksize=4800,
)
resampler = codec2.resampler()
# data binary string
if args.TESTFRAMES:
data_out = bytearray(14)
data_out[:1] = bytes([255])
data_out[1:2] = bytes([1])
data_out[2:] = b"HELLO WORLD"
else:
data_out = b"HELLO WORLD!"
# ----------------------------------------------------------------
# Open codec2 instance
freedv = ctypes.cast(codec2.api.freedv_open(MODE), ctypes.c_void_p)
# Get number of bytes per frame for mode
bytes_per_frame = int(codec2.api.freedv_get_bits_per_modem_frame(freedv) / 8)
payload_bytes_per_frame = bytes_per_frame - 2
# Init buffer for data
n_tx_modem_samples = codec2.api.freedv_get_n_tx_modem_samples(freedv)
mod_out = ctypes.create_string_buffer(n_tx_modem_samples * 2)
# Init buffer for preample
n_tx_preamble_modem_samples = codec2.api.freedv_get_n_tx_preamble_modem_samples(
freedv
)
mod_out_preamble = ctypes.create_string_buffer(n_tx_preamble_modem_samples * 2)
# Init buffer for postamble
n_tx_postamble_modem_samples = codec2.api.freedv_get_n_tx_postamble_modem_samples(
freedv
)
mod_out_postamble = ctypes.create_string_buffer(n_tx_postamble_modem_samples * 2)
# Create buffer for data
# Use this if CRC16 checksum is required (DATA1-3)
buffer = bytearray(payload_bytes_per_frame)
# set buffer size to length of data which will be sent
buffer[: len(data_out)] = data_out
# Create CRC for data frame - we are using the CRC function shipped with codec2 to avoid
# CRC algorithm incompatibilities
# generate CRC16
crc = ctypes.c_ushort(
codec2.api.freedv_gen_crc16(bytes(buffer), payload_bytes_per_frame)
)
crc = crc.value.to_bytes(2, byteorder="big") # convert crc to 2 byte hex string
buffer += crc # append crc16 to buffer
print(
f"TOTAL BURSTS: {N_BURSTS} TOTAL FRAMES_PER_BURST: {N_FRAMES_PER_BURST}",
file=sys.stderr,
)
for brst in range(1, N_BURSTS + 1):
# Write preamble to txbuffer
codec2.api.freedv_rawdatapreambletx(freedv, mod_out_preamble)
txbuffer = bytes(mod_out_preamble)
# Create modulaton for N = FRAMESPERBURST and append it to txbuffer
for frm in range(1, N_FRAMES_PER_BURST + 1):
data = (ctypes.c_ubyte * bytes_per_frame).from_buffer_copy(buffer)
# Modulate DATA and save it into mod_out pointer
codec2.api.freedv_rawdatatx(freedv, mod_out, data)
txbuffer += bytes(mod_out)
print(
f"TX BURST: {brst}/{N_BURSTS} FRAME: {frm}/{N_FRAMES_PER_BURST}",
file=sys.stderr,
)
# Append postamble to txbuffer
codec2.api.freedv_rawdatapostambletx(freedv, mod_out_postamble)
txbuffer += bytes(mod_out_postamble)
# Append a delay between bursts as audio silence
samples_delay = int(MODEM_SAMPLE_RATE * DELAY_BETWEEN_BURSTS)
mod_out_silence = ctypes.create_string_buffer(samples_delay * 2)
txbuffer += bytes(mod_out_silence)
# print(f"samples_delay: {samples_delay} DELAY_BETWEEN_BURSTS: {DELAY_BETWEEN_BURSTS}", file=sys.stderr)
# Resample up to 48k (resampler works on np.int16)
np_buffer = np.frombuffer(txbuffer, dtype=np.int16)
txbuffer_48k = resampler.resample8_to_48(np_buffer)
# Check if we want to use an audio device or stdout
if AUDIO_OUTPUT_DEVICE != -1:
stream_tx.start()
stream_tx.write(txbuffer_48k)
else:
# Print data to terminal for piping the output to other programs
sys.stdout.buffer.write(txbuffer_48k)
sys.stdout.flush()
# and at last check if we had an opened audio instance and close it
if AUDIO_OUTPUT_DEVICE != -1:
sd._terminate()
def parse_arguments():
# GET PARAMETER INPUTS
parser = argparse.ArgumentParser(description="Simons TEST TNC")
parser.add_argument("--bursts", dest="N_BURSTS", default=1, type=int)
parser.add_argument(
"--framesperburst", dest="N_FRAMES_PER_BURST", default=1, type=int
)
parser.add_argument(
"--delay",
dest="DELAY_BETWEEN_BURSTS",
default=500,
type=int,
help="delay between bursts in ms",
)
parser.add_argument(
"--mode", dest="FREEDV_MODE", type=str, choices=["datac0", "datac1", "datac3"]
)
parser.add_argument(
"--audiodev",
dest="AUDIO_OUTPUT_DEVICE",
default=-1,
type=int,
help="audio output device number to use, use -2 to automatically select a loopback device",
)
parser.add_argument(
"--list",
dest="LIST",
action="store_true",
help="list audio devices by number and exit",
)
parser.add_argument(
"--testframes",
dest="TESTFRAMES",
action="store_true",
default=False,
help="list audio devices by number and exit",
)
args, _ = parser.parse_known_args()
return args
if __name__ == "__main__":
test_tx()